摘要
在现行规范中,沿缓倾外倾软弱结构面滑动的边坡主动岩石压力E_(ak)公式未考虑后缘裂隙水压力,导致Eak计算存在偏差。针对这一问题,考虑后缘裂隙水压力,根据力系的平衡关系和几何条件,进行受力分析和简化,推导主动岩石压力计算公式,判断是否存在极值点以及其位置。研究结果表明,与不考虑后缘裂隙水压力相比,E_(ak)的误差达到21.89%~100%;E_(ak)在有实际工程意义区间内存在极大值。针对缓倾岩层倾角θ和结构面内摩擦角φ大小进行讨论,当θ>φ时,坡顶潜在滑裂面宽度b_(0)一般为边坡高度H的0.2~1.2倍;当θ≤φ时,E_(ak)的极大值出现在坡面位置。本次研究分类完善了计算公式,并对极值点位置和H等因素之间的关系进行了分析,对沿缓倾软弱外倾结构面滑动边坡的防治具有理论和工程实践意义。
In the current code,the E_(ak) formula for active rock pressure of slopes sliding along gently inclined outward weak structural planes does not consider the water pressure of the trailing edge fractures,which leads to deviation in E_(ak) calculation.In view of this problem,according to the balance relationship and geometric conditions of the force system,the stress analysis and simplification are carried out considering the water pressure of the trailing edge crack,and the calculation formula of the active rock pressure is derived to determine whether there is an extreme point and its location.The research results show that the error of E_(ak) is 21.89%-100%without considering water pressure;E_(ak) has a maximum in the effective range.The dip angle of gently inclined rock stratum θ and the friction angle in the structural plane φ are compared,it is found that if θ>φ,the width of potential slip surface at the top of slope is generally 0.2-1.2 times of the slope height H;and if θ≤φ,the maximum value of E_(ak) appears on the slope.This study improves the calculation formula by classification,and analyses the correlation between the extreme point position and some factors including H.It is of theoretical and practical significance for the prevention and control of sliding slope along gently inclined soft outward inclined structural plane.
作者
陈柏林
杨文君
谢强
彭海游
叶晓明
檀康
周鹏
CHEN Bo-lin;YANG Wen-jun;XIE Qiang;PENG Hai-you;YE Xiao-ming;TAN Kang;ZHOU Peng(School of Civil Engineering,Chongqing University,Chongqing 401144,China;Technology Innovation Center of Geohazards Automatic Monitoring,Ministry of Natural Resources,Chongqing Institute of Geology and Mineral Resources,Chongqing 401120,China;Chongqing Engineering Research Center of Automatic Monitoring for Geological Hazards,Chongqing Institute of Geology and Mineral Resources,Chongqing 401120,China;Chongqing Minsi Geotechnical Engineering Co.,Ltd.,Chongqing 401121,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第11期3272-3279,3287,共9页
Rock and Soil Mechanics
基金
重庆市自然科学基金面上项目(No.CSTB2022NSCQ-MSX1466)
重庆市规划和自然资源局科技项目(No.KJ-2022029)。
关键词
缓倾
软弱外倾结构面
主动岩石压力
裂隙水压力
gently inclined
weak outward inclined structural plane
active rock pressure
fissure water pressure
