Study on Prediction and Mechanism of Residual Soil Slope Failure due to Rainfall by Numerical Analysis

降雨残积土边坡破坏数值分析预测及机理研究

• 批准号: 63550367
• 负责人: SASAKI Seiichi
• 金额: $ 1.34万
• 依托单位: Wakayama National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550367/
• 关键词: Residual Soil; Decomposed Granite Soil; Degree of Weathering; Physio-Chemical Properties; Seepage Analysis; Slope Failure; Elastic-Plastic Analysis; 不飽和浸透; 物理科学的性質

The purpose of this study is to find out the factors controlling the seepage properties in the undisturbed decomposed granite soil in order to investigate the mechanism of the slope-failure, and to clarify the applicability of the seepage parameters to numerical analysis for the water permeation into the layered soils.It has done to examine experimentally the relationship between the degree of weathering and the seepage parameters evaluated by the physical properties of various kinds of the decomposed granite soil. From this research, both the values of ignition loss and the dry density of sample are useful as a criterion of the degree of weathering from the engineering points of view, and, also the parameters controlling the seepage characteristics of undisturbed sample can be determined accurately by means of neutron ray radiation method.The collapsible ground is characterized by the hysteresis of soil water characteristics curve and the dominant pore size distribution, and these factors give a large influence on the hydraulic conductivity.The numerical analysis was conducted by using a different weathered soil layer model-FEM analysis combining the saturated-unsaturated flow analysis and the elastic-plastic analysis. As a result, it has demonstrated that slope failure pattern due to water permeation can be predicted by both the properties of pore water pressure and soil deformation.

本研究的目的是找出控制原状风化花岗岩土渗流特性的因素，探讨边坡失稳的机理，并阐明渗流参数在层状土渗水数值分析中的适用性。 风化花岗岩土。研究结果表明，从工程角度看，烧失量值和试样干密度均可作为风化程度的判据，并且通过中子射线辐射法可以准确确定控制原状试样渗流特性的参数。 采用不同风化土层模型——有限元分析，结合饱和-非饱和流动分析和弹塑性分析进行数值分析。结果表明，渗透水引起的边坡破坏模式可以通过孔隙水压力和土体变形的特性来预测。

项目成果

Seiichi SASAKI: "Estimation of Parameters Controlling Seepage Characteristics of Unsaturated Decomposed Granite Soil Based on Physical properties of Soils" Symposium of Residual Soils, JSSMFE. 183-188 (1988)

Seiichi SASAKI：“基于土壤物理性质的控制非饱和风化花岗岩土渗流特性的参数估计”残留土研讨会，JSSMFE。

佐々木清一: 第44回年次学術講演会、土木学会. (1989)

Seiichi Sasaki：第 44 届学术年会，日本土木工程师学会（1989 年）。

Seiichi SASAKI: "Relationship Between Soil Structure and Seepage Parameter of Undisturbed Decomposed Granite Soil" Proc. of The 45th Annual Conf., JSCE. 818-819 (1990)

Seiichi SASAKI：“原状风化花岗岩土结构与渗流参数的关系”Proc。

Seiichi Sasaki: "Estimation of Parameters Controlling Seepage Characteristics of Unsaturated Decomposed Granite Soil and their Application to Seepage Analysis" Residual Soils in Japan(土質工学会). (1990)

Seiichi Sasaki：“控制非饱和分解花岗岩土壤渗流特性的参数估计及其在渗流分析中的应用”日本残留土壤（土壤工程学会）（1990 年）。

佐々木清一: "拘束水分を考えたまさ土の不飽和浸透パラメ-タの評価について" 土木学会第45回年次学術講演会講演概要集,第3部. (1990)

佐佐木精一：“考虑限制水分的玛莎土的不饱和渗透参数的评估”日本土木工程学会第45届年度学术会议摘要，第3部分。（1990年）