摘要
为研究物质组成空间分布特征对降雨下碎石土斜坡变形破坏的影响,以不同成因碎石土斜坡的特点为依照,进行了4种物质组成空间分布的碎石土斜坡模型及1种均质斜坡模型试验。结果表明,物质组成空间分布特征对降雨下碎石土斜坡变形破坏所发挥的作用与降雨入渗方向和应力调整方向有重要关系。当土料变化方向与入渗方向大角度相交且与应力调整方向相同时,斜坡渗透性为土料各自的渗透性,斜坡力学性质偏向于组成土料力学性质的最大值。当土料变化方向与入渗方向相同且与应力调整方向大角度相交时,斜坡渗透性接近组成土料渗透性的最小值,斜坡变形破坏受控于其中的软弱土料。降雨下斜坡各处均发生变形,且变形向周围调整并产生影响。破裂面更易发于软弱土料中。该研究有助于斜坡灾害勘察、预测评价及防治向精细化方向发展。
To study the influence of the spatial distribution characteristics of material composition on the deformation and failure of gravel soil slope under rainfall,four types of material composition spatial distribution gravel soil slopes and homogeneous slope model tests were conducted according to the characteristics of gravel soil slopes of different geneses.Results show that the role of spatial distribution of material composition played in the deformation and failure of gravel soil slope under rainfall depends on the directions of rainfall infiltration and stress adjustment.When the change direction of soil material intersects the rainfall infiltration direction at a large angle and is the same as the stress adjustment direction,the permeability of slope is actually the permeability of the constituent materials themselves,and the mechanical properties of slope approach the maximum value of the mechanical properties of soil materials that form the slope.When the change direction of soil material is the same as the rainfall infiltration direction and intersects the stress adjustment direction at a large angle,the slope permeability approaches the minimum value of the permeability of the constituent soil material,and the slope deformation and failure are controlled by the weak soil material.The deformation occurs in all parts of the slope under rainfall,and it adjusts to surroundings and thus affecting the surroundings.The fractured surface is more likely to occur in weak soil.Research contributes to the development of the slope disaster investigation,prediction,evaluation and prevention towards refinement.
作者
周翔
蔡静森
马伟成
肖皓文
ZHOU Xiang;CAI Jing-sen;MA Wei-cheng;XIAO Hao-wen(Faculty of Engineering,China University of Geosciences,Wuhan,Hubei 430074,China;Engineering Research Center of Rock-Soil Drilling&Excavation and Protection of Ministry of Education,China University of Geosciences,Wuhan,Hubei 430074,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第2期531-540,共10页
Rock and Soil Mechanics
基金
国家自然科学基金青年项目(No.41807264)
教育部重点实验室开放基金课题(No.2020KDZ01)
岩土钻掘与防护教育部工程研究中心开放课题基金(No.202102)。
关键词
碎石土斜坡
室内模型试验
物质组成空间分布
应力调整
降雨入渗
变形破坏规律
gravel soil slope
laboratory model test
spatial distribution of material composition
stress adjustment
rainfall infiltration
pattern of deformation and failure
