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学者姓名:樊秀峰
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The tensile strength of roots and the friction characteristics of the root-soil interface of tree species are the indicators that play a crucial role in understanding the mechanism of soil reinforcement by roots. To calculate the effectiveness of the reinforcement of soil by tree roots based on essential influencing parameters, typical trees in the coastal region of southeastern China selected for this study were subjected to tests of the tensile mechanical properties of their roots, as well as studies on the friction characteristics of the root-soil interface and the microscopic interfaces. The results indicated that in the 1-7 diameter classes, the root tensile strength of both Pinus massoniana and Cunninghamia lanceolata was negatively correlated with the root diameter in accordance with the power function. The root tensile strength of these two trees, however, was positively correlated with the lignin content but negatively correlated with cellulose and hemicellulose contents. The shear strength at the root-soil interface and the vertical load exhibited a constitutive relationship, which followed the Mohr-Coulomb criterion. As the root diameter increased, both the cohesion and the friction coefficients at the root-soil interface gradually increased, but the growth rate stood at around 15%. The cohesion value of the root-soil interface of the two trees decreased linearly with the increase in soil moisture content within the range of 25 to 45%. At the microinterface, the root surface of C. lanceolata exhibited concave grooves and convex ridges that extended along the axial direction of roots, with their height differences increasing with the enlargement of the root diameter. The rough surface of P. massoniana roots had areas composed of polygonal meshes, with an increase observed in the mesh density with increasing root diameter.
Keyword :
chemical composition chemical composition root-soil interface root-soil interface root surface microstructure root surface microstructure tensile strength tensile strength tree roots tree roots
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GB/T 7714 | Lin, Yunzhao , Jian, Wenbin , Zhu, Zuteng et al. Study on the Mechanical Properties of Roots and Friction Characteristics of the Root-Soil Interface of Two Tree Species in the Coastal Region of Southeastern China [J]. | FORESTS , 2024 , 15 (8) . |
MLA | Lin, Yunzhao et al. "Study on the Mechanical Properties of Roots and Friction Characteristics of the Root-Soil Interface of Two Tree Species in the Coastal Region of Southeastern China" . | FORESTS 15 . 8 (2024) . |
APA | Lin, Yunzhao , Jian, Wenbin , Zhu, Zuteng , Wu, Yilong , Wang, Hao , Fan, Xiufeng . Study on the Mechanical Properties of Roots and Friction Characteristics of the Root-Soil Interface of Two Tree Species in the Coastal Region of Southeastern China . | FORESTS , 2024 , 15 (8) . |
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Variable-density groundwater flow (VDGF) is jointly driven by hydraulic and density gradient, leading to strong nonlinearity, large computational burden of numerical models, and therefore huge computational cost of Monte Carlo simulation for uncertainty analysis. This study developed the reduced-order model (ROM) for VDGF and built the Gaussian process (GP) for simulating the numerical error of the ROM. The coupled model can obtain solutions of head and salinity across the study domain while GP simulates observation information at limited locations. Moreover, the coupled model can provide higher solution accuracies of head and salinity at the observation locations than the ROM. A two-dimensional (cross-section) VDGF test case was considered, where hydraulic conductivity was taken as a spatially random field. MC simulations were performed using three models, including the full-system model, the ROM, and the coupled model, with corresponding MC strategies denoted as FSMC, ROMC, and GP-ROMC, respectively. The results show that ROMC can be an alternative to FSMC for conducting uncertainty quantification. The relationship between head (or salinity) and the dimensional of ROM can be characterized using power functions with determinate coefficients larger than 0.99. GP-ROMC has higher solution accuracy than ROMC, which indicates that GP is capable for simulating the numerical error of ROM. The results in this study are significant for performing simulation, uncertainty quantification, risk assessment, and parameter estimate in the context of groundwater. © 2024 Editorial Office of Hydrogeology and Engineering. All rights reserved.
Keyword :
Gaussian process Gaussian process groundwater groundwater Monte Carlo simulation Monte Carlo simulation reduced-order model reduced-order model variable-density groundwater flow variable-density groundwater flow
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GB/T 7714 | Xia, C. , Fan, X. , Wang, H. et al. Monte Carlo simulation for variable-density groundwater flow through reduced-order model coupled with Gaussian process; [耦合变密度地下水流降阶模型与高斯过程的蒙特卡罗模拟] [J]. | Hydrogeology and Engineering Geology , 2024 , 51 (5) : 1-13 . |
MLA | Xia, C. et al. "Monte Carlo simulation for variable-density groundwater flow through reduced-order model coupled with Gaussian process; [耦合变密度地下水流降阶模型与高斯过程的蒙特卡罗模拟]" . | Hydrogeology and Engineering Geology 51 . 5 (2024) : 1-13 . |
APA | Xia, C. , Fan, X. , Wang, H. , Jian, W. . Monte Carlo simulation for variable-density groundwater flow through reduced-order model coupled with Gaussian process; [耦合变密度地下水流降阶模型与高斯过程的蒙特卡罗模拟] . | Hydrogeology and Engineering Geology , 2024 , 51 (5) , 1-13 . |
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Moso bamboo is widespread in the hilly and mountainous regions of southeastern Fujian. Moso bamboo is extensively distributed across the hilly and mountainous regions of southeastern Fujian. To delve into the unique vegetation Moso bamboo’s root-soil composite and its resistance to pullout and shear forces, as well as its influence on slope stability, we conducted on-site whole Moso bamboo pullout tests and in-situ shear tests using bespoke instruments on Moso bamboo of varying diameters in the landslide-prone area of Zhuangbian Village, Linglu Township, Yongtai County of Fuzhou. A universal testing machine was employed to conduct single-root pullout tests on roots of varying diameters within the on-site root-soil complex. The results reveal that the diameter of Moso bamboo influences its tensile strength during whole-plant pullout tests, with larger diameters exhibiting higher ultimate tensile and shear strengths. Both the Moso bamboo culm and rhizome play a crucial role in resisting pullout forces. Moreover, the diameter of individual Moso bamboo roots shows a linear positive correlation with the ultimate tensile force while tensile strength decreases with increasing root diameter. Regarding shear resistance, there is a positive correlation between Moso bamboo diameter and the shear strength of the root-soil composite. It is of great significance in theoretical and practical implications for analyzing the mechanical properties of Moso bamboo root-soil composite, understanding the mechanisms of geological disasters in Moso bamboo forest slopes, and enhancing the effectiveness of vegetation in slope protection. © 2024 Institute of Engineering Mechanics (IEM). All rights reserved.
Keyword :
Moso bamboo Moso bamboo pullout pullout root root root-soil composite root-soil composite stable slope stable slope
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GB/T 7714 | Zhong, X. , Jian, W. , Fan, X. et al. Mechanical properties of Moso bamboo root-soil composite based on field prototype testing; [基于现场原型测试的毛竹根土复合体力学性能研究] [J]. | Journal of Natural Disasters , 2024 , 33 (5) : 38-47 . |
MLA | Zhong, X. et al. "Mechanical properties of Moso bamboo root-soil composite based on field prototype testing; [基于现场原型测试的毛竹根土复合体力学性能研究]" . | Journal of Natural Disasters 33 . 5 (2024) : 38-47 . |
APA | Zhong, X. , Jian, W. , Fan, X. , Wu, Y. , Lin, Y. , Zhang, J. . Mechanical properties of Moso bamboo root-soil composite based on field prototype testing; [基于现场原型测试的毛竹根土复合体力学性能研究] . | Journal of Natural Disasters , 2024 , 33 (5) , 38-47 . |
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Landslides frequently occur in heavily vegetated areas of southeast Fujian Province due to typhoon rainstorms. Investigating the failure mechanisms and evolution patterns of landslides influenced by vegetation, rainfall, and strong winds is crucial for disaster mechanism, monitoring, and early warning of typhoon-induced landslides in densely vegetated regions. This study focuses on the Yangxie landslide in Yongtai County, Fujian Province, investigating response patterns and analysis methods for vegetated slope stability under wind-driven rain conditions. Pulling tests on moso bamboo and single-ring infiltration tests were conducted, integrating the Green-Ampt model and infinite side slope model. Detailed main results include: 1) Bamboo’s maximum wind resistance ranges from 18 m/s to 30 m/s, corresponding to wind forces of 8 to 11. 2) Soil infiltration capacity in the windward area increases with wind speed, remaining constant at 0–12 m/s but rising rapidly beyond 12 m/s. 3) The wetting front’s migration speed in the root-soil zone accelerates with increasing wind speed and rainfall. Typhoons disturb soil by swaying vegetation to create preferential flow, mainly accelerating the wetting front’s migration speed. Wind speed significantly impacts soil infiltration capacity under wind, rain, and vegetation interactions. 4) During typhoon rainstorms, wind loads enhance rainfall infiltration in the root-soil zone through vegetation, thereby speeding up the wetting front’s migration. This process is critical for typhoon-induced landslide occurrence and development. © 2024 Biodiversity Research Center Academia Sinica. All rights reserved.
Keyword :
Aerodynamic loads Aerodynamic loads Bamboo Bamboo Disasters Disasters Infiltration Infiltration Landslides Landslides Rain Rain Slope protection Slope protection Soil testing Soil testing Tropics Tropics Wind stress Wind stress
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GB/T 7714 | Lin, Bin-Qiang , Zhang, De-Sheng , Jian, Wen-Bin et al. Response of vegetated slope stability under wind-driven rain conditions [J]. | Rock and Soil Mechanics , 2024 , 45 (9) : 2765-2774 . |
MLA | Lin, Bin-Qiang et al. "Response of vegetated slope stability under wind-driven rain conditions" . | Rock and Soil Mechanics 45 . 9 (2024) : 2765-2774 . |
APA | Lin, Bin-Qiang , Zhang, De-Sheng , Jian, Wen-Bin , Dou, Hong-Qiang , Wang, Hao , Fan, Xiu-Feng . Response of vegetated slope stability under wind-driven rain conditions . | Rock and Soil Mechanics , 2024 , 45 (9) , 2765-2774 . |
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变密度地下水流系统受水力梯度和密度梯度共同驱动,非线性强,数值模型计算量大,尤其在开展不确定性分析时需要的计算成本很高。常规的数据驱动机器学习方法只能对点监测信息进行模拟分析,不能模拟整个地下水流系统。本研究发展了变密度地下水流降阶模型,利用高斯过程模型对降阶模型的数值误差进行修正组成耦合模型。耦合模型既能克服高斯过程只能模拟有限监测点信息的缺陷,又能提高降阶模型对监测点信息的模拟精度。考虑二维剖面变密度地下水流案例,将渗透系数场设定为空间随机变量,采用基于全阶模型(FSMC)、降阶模型(ROMC)和耦合模型(GP-ROMC)3种蒙特卡罗模拟方法进行不确定分析。研究结果表明:(1)ROMC能替代FSMC开展不确定性分析;(2)水头和盐度的平均相对二范误差与降阶模型维度的关系可用指数函数描述(决定性系数R2≥0.99);(3)GP-ROMC对监测点信息的模拟精度比ROMC高,GP-ROMC可有效修正降阶模型误差提高蒙特卡罗模拟的精度。研究成果可为地下水建模、不确定性分析、风险评估及参数反演等工作提供重要技术支撑。
Keyword :
变密度地下水流 变密度地下水流 地下水 地下水 蒙特卡罗模拟 蒙特卡罗模拟 降阶模型 降阶模型 高斯过程 高斯过程
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GB/T 7714 | 夏传安 , 樊秀峰 , 王浩 et al. 耦合变密度地下水流降阶模型与高斯过程的蒙特卡罗模拟 [J]. | 水文地质工程地质 , 2024 , 51 (5) : 1-13 . |
MLA | 夏传安 et al. "耦合变密度地下水流降阶模型与高斯过程的蒙特卡罗模拟" . | 水文地质工程地质 51 . 5 (2024) : 1-13 . |
APA | 夏传安 , 樊秀峰 , 王浩 , 简文彬 . 耦合变密度地下水流降阶模型与高斯过程的蒙特卡罗模拟 . | 水文地质工程地质 , 2024 , 51 (5) , 1-13 . |
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闽东南高植被覆盖区台风暴雨型滑坡频发,探索在植被、降雨、强风作用下的滑坡失稳演化及其规律对揭示高植被覆盖区台风暴雨型滑坡的成灾机制、监测预警具有重要的理论及实际意义。以福建省永泰县洋斜滑坡为研究对象,对斜坡上的毛竹进行拉拔试验以及对根土区进行单环入渗试验,结合Green-Ampt模型和无限边坡模型,研究在台风暴雨作用下植被土坡的稳定性响应规律及其稳定性分析方法。结果表明:(1)毛竹抵御的极限风速主要在18~30 m/s的范围之内,对应8~11级风力范围。(2)毛竹迎风区土体入渗能力随着风速的增长而增长,0~12 m/s内入渗能力基本不变,12 m/s以上入渗能力迅速增长。(3)根土区湿润锋的迁移速度随着风速和降雨强度的增大而加快,台风通过植被扰动土体形成优势渗流,对入渗的影响主要在于加快了湿润锋的迁移速度。风-雨-植被协同作用下,风速是影响土体入渗能力的重要因素。(4)台风暴雨作用下风荷载通过植被加快根区土降雨入渗,从而增大湿润锋迁移速度,是台风暴雨型滑坡孕灾、成灾的重要环节。
Keyword :
湿润锋 湿润锋 滑坡 滑坡 边坡稳定性 边坡稳定性 降雨 降雨 风荷载 风荷载
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GB/T 7714 | 林滨强 , 章德生 , 简文彬 et al. 风驱雨作用下植被斜坡稳定性响应研究 [J]. | 岩土力学 , 2024 , (09) . |
MLA | 林滨强 et al. "风驱雨作用下植被斜坡稳定性响应研究" . | 岩土力学 09 (2024) . |
APA | 林滨强 , 章德生 , 简文彬 , 豆红强 , 王浩 , 樊秀峰 . 风驱雨作用下植被斜坡稳定性响应研究 . | 岩土力学 , 2024 , (09) . |
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毛竹在闽东南丘陵山地广泛分布,为了研究闽东南特色植被毛竹的根土复合体抗拔与抗剪性能及其对斜坡稳定性的影响,在福州市永泰县岭路乡庄边村滑坡区,使用自行研发的专利仪器对不同直径的毛竹进行原位整株拉拔试验与原位剪切试验;使用万能试验机对现场根土复合体中不同直径根系进行单根拉拔试验.结果表明:在抗拉性能上,毛竹的直径大小会影响到毛竹整株拉拔的强度,随着直径增大其极限整株抗拉强度与抗剪强度均提升,毛竹竹鞭与丝根具有有效抗拔作用;毛竹单根根系的直径与极限抗拉力呈线性正相关,与抗拉强度呈负相关;在抗剪性能上,毛竹直径与根土复合体抗剪强度呈正相关.研究成果对分析毛竹根土复合体力学性能,揭示竹林斜坡成灾机制,提高植被护坡效益具有重要的理论及实际意义.
Keyword :
抗拔 抗拔 根土复合体 根土复合体 根系 根系 毛竹 毛竹 边坡稳定 边坡稳定
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GB/T 7714 | 钟鑫 , 简文彬 , 樊秀峰 et al. 基于现场原型测试的毛竹根土复合体力学性能研究 [J]. | 自然灾害学报 , 2024 , 33 (5) : 38-47 . |
MLA | 钟鑫 et al. "基于现场原型测试的毛竹根土复合体力学性能研究" . | 自然灾害学报 33 . 5 (2024) : 38-47 . |
APA | 钟鑫 , 简文彬 , 樊秀峰 , 吴宜龙 , 林昀昭 , 张骏逸 . 基于现场原型测试的毛竹根土复合体力学性能研究 . | 自然灾害学报 , 2024 , 33 (5) , 38-47 . |
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碎石土是一种非连续、非均质的结构性材料,由于内部含有大量碎石块,容易形成架空结构,使其内部形成复杂独特的渗流通道即优先流通道,碎石土优先流通道是包括水分运移和土体细颗粒迁移的复杂过程,但在研究其优先流路径时通常只考虑了水分的运移而忽略了细颗粒的迁移,颗粒迁移与通道形成密切相关。为此,对两种不同级配土柱(粗细颗粒连续级配和间断级配)分别进行饱和渗流-颗粒迁移试验,从细颗粒迁移的角度分析通道形成的时空发展规律。试验结果表明:细颗粒迁移一部分由于流失引起碎石土渗透性增大,另一部分由于重新沉积而堵塞局部孔隙,降低渗透性,两者作用结果最终加速优先流通道形成;连续级配的碎石土形成大面积交叉分布的管网状渗流通道,间断级配的碎石土则形成集中渗流通道;相同水力条件下,不同级配细颗粒迁移的空间分布特征不同,连续级配的碎石土细颗粒迁移不随空间位置的差异而发生变化,间断级配的碎石土细颗粒迁移随空间位置的差异而发生变化,两种级配下碎石土细颗粒主要流失量的粒径范围均在1~0.075 mm;不同水力梯度条件下,连续与间断级配试验细颗粒流失量均随水力梯度增加而增大,间断级配的碎石土破坏时水力梯度小于连续级配破坏时水力梯度,间断级配碎石土更容易发生破坏。研究成果为进一步揭示碎石土优先流形成机理提供试验依据。
Keyword :
优先流通道 优先流通道 碎石土 碎石土 细颗粒迁移 细颗粒迁移
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GB/T 7714 | 王晓摇 , 樊秀峰 , 简文彬 et al. 碎石土细颗粒迁移特征及优先流形成路径 [J]. | 工程地质学报 , 2024 , 32 (02) : 387-396 . |
MLA | 王晓摇 et al. "碎石土细颗粒迁移特征及优先流形成路径" . | 工程地质学报 32 . 02 (2024) : 387-396 . |
APA | 王晓摇 , 樊秀峰 , 简文彬 , 吴振祥 , 吕澄浒 . 碎石土细颗粒迁移特征及优先流形成路径 . | 工程地质学报 , 2024 , 32 (02) , 387-396 . |
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Landslides induced by typhoon and associated rainstorm in high vegetation coverage area have remarkable characteristics of mass, sudden and high hiddenness. Given the increasing demand for disaster prevention and mitigation, how to scientifically reveal their failure mechanisms and construct intelligent early warning models is becoming a hot and cutting-edge problem in current research. Firstly, the paper takes the frequent occurrence of landslides induced by typhoon and associated rainstorm in Zhejiang and Fujian provinces as an example, and systematically summarizes their geomorphological, spatial and temporal distribution and overlying vegetation and other developmental characteristics. Secondly, the current status and shortcomings of the research on the mechanism of landslides induced by typhoon and associated rainstorm, and the influence of vegetation on slope stability and its early warning were highlighted and analyzed. On this basis, it is emphasized that there are still three problems that need to be solved in the current research on landslides induced by typhoon and associated rainstorm in high vegetation coverage area: 1) the hydrological dynamic response of vegetated slopes under the combined effect of typhoon and rainstorm is not sufficiently described; 2) the mechanism of disaster is still unclear and the methodology of landslide stability evaluation is lack of relevance; 3) there are few dynamic early warning models that take into account the coupling of multiple parameters, and the existing early warning models are insufficient to provide refined and accurate warnings for landslides induced by typhoon and associated rainstorm in high vegetation coverage area. Finally, it is suggested that future research should focus on the interaction between geology, vegetation and meteorology, and identify the environment and developmental patterns of landslides induced by typhoon and associated rainstorm in high vegetation coverage area, reveal the failure process and disaster mechanism, and establish a spatial and temporal early warning model for the whole process of typhoon and associated rainstorm. The paper aims to explore a new perspective and research idea for the study of landslide induced by typhoon and associated rainstorm, and to provide a scientific decision-making and technical support for the early warning and prevention and control of landslides induced by typhoon and associated rainstorm in high vegetation coverage area worldwide. © 2023 Science Press. All rights reserved.
Keyword :
disaster mechanism disaster mechanism early warning early warning high vegetation coverage high vegetation coverage landslide landslide typhoon and rainstorm typhoon and rainstorm
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GB/T 7714 | Dou, H. , Jian, W. , Wang, H. et al. Review of failure mechanism and early warning model of landslides induced by typhoon and associated rainstorm in high vegetation coverage area; [高植被覆盖区台风暴雨型滑坡成灾机制及 预警模型研究综述] [J]. | Journal of Natural Disasters , 2023 , 32 (2) : 1-15 . |
MLA | Dou, H. et al. "Review of failure mechanism and early warning model of landslides induced by typhoon and associated rainstorm in high vegetation coverage area; [高植被覆盖区台风暴雨型滑坡成灾机制及 预警模型研究综述]" . | Journal of Natural Disasters 32 . 2 (2023) : 1-15 . |
APA | Dou, H. , Jian, W. , Wang, H. , Fan, X. , Liu, H. , Wu, Z. . Review of failure mechanism and early warning model of landslides induced by typhoon and associated rainstorm in high vegetation coverage area; [高植被覆盖区台风暴雨型滑坡成灾机制及 预警模型研究综述] . | Journal of Natural Disasters , 2023 , 32 (2) , 1-15 . |
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本发明涉及一种水头变动下颗粒迁移特征及优先流路径形成模拟装置,包括渗流土柱模型、水头调节组件、收集组件;水头调节组件包括机架、水箱、承重台,机架上竖直安装有丝杆及竖导杆,竖导杆套设在承重台四个角部,承重台套设在丝杆上并与之螺纹配合,水箱放置在承重台上,水箱出水口经供水管路的连接渗流土柱模型;本装置能模拟在相同水力条件下,不同级配碎石土饱和渗流试验优先流路径形成的过程,利用水头调节组件实现水头的稳定变化;本能模拟在相同水力条件下,细颗粒迁移对碎石土优先流路径形成的影响。观察不同水头下细颗粒迁移,记录实验现象,并收集细颗粒流失量及渗流量,进行对比分析。
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GB/T 7714 | 樊秀峰 , 王晓摇 , 吴振祥 et al. 水头变动下颗粒迁移特征及优先流路径形成模拟装置 : CN202111644690.0[P]. | 2021-12-30 00:00:00 . |
MLA | 樊秀峰 et al. "水头变动下颗粒迁移特征及优先流路径形成模拟装置" : CN202111644690.0. | 2021-12-30 00:00:00 . |
APA | 樊秀峰 , 王晓摇 , 吴振祥 , 吕澄浒 . 水头变动下颗粒迁移特征及优先流路径形成模拟装置 : CN202111644690.0. | 2021-12-30 00:00:00 . |
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