考虑块石长轴倾角和土石接触面的土石混合体边坡稳定性分析  被引量:8

Stability Analysis of the Soil-Rock Slope Considering Long Axis Inclination and Soil-Rock Interface

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作  者:黄献文 姚直书[1] 王伟[3] 周爱兆[2] 姜朋明[2] HUANG Xianwen;YAO Zhishu;WANG Wei;ZHOU Aizhao;JIANG Pengming(School of Architecture and Civil Eng.,Anhui Univ.of Sci.and Technol.,Huainan 232000,China;School of Architecture and Civil Eng.,Jiangsu Univ.of Sci.and Technol.,Zhenjiang 212000,China;School of Architecture and Civil Eng.,Shaoxing Univ.,Shaoxing 312000,China)

机构地区:[1]安徽理工大学土木建筑学院,安徽淮南232000 [2]江苏科技大学土木工程与建筑学院,江苏镇江212000 [3]绍兴文理学院土木工程系,浙江绍兴312000

出  处:《工程科学与技术》2021年第1期47-59,共13页Advanced Engineering Sciences

基  金:国家自然科学基金项目(51674006;51309121;51678300);安徽省大学学科(专业)顶尖人才项目(gxbjZD09);安徽省自然科学研究院研究重点项目(KJ2018A0098);安徽理工大学青年教师科研基金项目(QN2017211)。

摘  要:为准确分析土石混合体边坡稳定性,提出了一种基于原始块石形状库的随机土石混合体边坡模型构建方法。采用该方法和有限元极限分析软件Optum G2,结合土石混合体边坡物理模型试验,研究了块石掺量、长轴倾角和土石接触面强度对土石混合体边坡稳定性的影响。结果表明:块石在边坡剪切带存在“绕行”“分流”“包含”3种塑性扩展模式,并改变边坡剪切带的曲折点、长度和发展方向;当块石掺量大于20%时,块石分布对边坡稳定性的影响较大;在高块石掺量下,边坡容易出现“局部”或“崩解式”破坏;在相同块石掺量下,块石长轴倾角平行或垂直于边坡剪切带时,边坡分别获得最小或最大安全系数;当块石长轴垂直于边坡剪切带时,边坡容易出现“崩解式”破坏,这主要与块石长轴对于边坡剪切带发展的“诱导”效应有关;在相同块石分布模型下,边坡安全系数随土石接触面系数的减小而降低,甚至会低于均质土边坡;当土石接触面强度低于土体强度时,块石对边坡剪切带存在“吸引”效应。研究结果为土石混合体边坡稳定性的评估和治理提供参考。In order to accurately analyze the stability of soil-rock slopes,based on the original rock shape library,a random soil-rock slope model establishing method was proposed.This method could consider the shape and distribution characteristics of rocks very well.Using this method,finite element limit analysis software Optum G2,combined with physical models,the stability of soil-rock slope considering different rock contents(0~50%),long axis inclinations(0°~180°)and soil-rock contacting surface(0.01~1.40)were studied.The results showed that the influence of rocks on the shear zone of the slope included three development modes:“bypass”,“diversion”and“include”,which lead to the change of bending point,length and developing direction of the shear zone.Through the study on the stability of slope with different rock contents,it was found that when rock content was more than 20%,the influence of rock distribution on the stability of slope was greater,and the slope with high rock content was prone to“local”or“disintegrating”failure.At the same rock content,the minimum(or maximum)safety factor was obtained when the long axial inclinations of rock blocks were parallel(or vertical)to the shear zone of the slope.When the rock long axis was vertical to the shear zone of the slope,the slope was prone to“disintegration”failure,which was mainly related to the“induced”effect of the rock long axis on the shear zone of the slope.Under the same rock distribution model,the slope safety factor decreased with the decrease of the soil-rock contacting surface coefficient,and when soil-rock contacting surface strength was lower than that of the soil,the“attraction”effect of rocks to devel-opment of the shear zone would appeared.The research results could provide a reference for the stability analysis and treatment of soil-rock slopes.

关 键 词:土石混合体边坡 极限分析 随机块石模型 块石掺量 长轴倾角 土石接触面 

分 类 号:TU411[建筑科学—岩土工程]

 

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