摘要
本研究以工程调研为基础,对贵州高速公路红黏土边坡破坏特征进行了分析。采用现场DCP和室内直剪试验,对边坡坡面不同深度的相对强弱程度、土体抗剪强度参数与含水率的关系进行研究,并探讨了边坡破坏机理如下:边坡开挖扰动、干缩开裂引发裂隙逐渐发育和联通;同时,降雨入渗造成土体含水率增加,引起上部滑体容重增加和土体抗剪强度衰减,致使边坡安全系数大幅降低。针对简化Bishop法用于红黏土边坡稳定性评价存在的不合理性,提出了基于工程调研分析的数值模拟计算方法,并在工程实例中较好地得到了验证,该方法有助于在边坡防护中实现精准防护,具有一定的社会效益。
Based on engineering investigations,the failure characteristics of red clay slope of expressways in Guizhou Province are analyzed.The field DCP test and indoor direct shear test are used to study the relative strength of red clay slope at different depths,and the relationship between soil shear strength parameters and water content.Then,the failure mechanism of red clay slope is discussed.The disturbance of slope excavation,drying shrinkage and cracking lead to the gradual development and communication of cracks,and rainfall infiltration leads to the increase of soil moisture content,which results in the increase of bulk density of upper sliding mass and the attenuation of soil shear strength.Therefore,the safety factor of slope is greatly reduced.Aiming at the irrationality of the simplified Bishop method used in the stability evaluation of red clay slope,a numerical simulation calculation method based on engineering investigation and analysis is proposed,which has been well verified in engineering examples.This is helpful to realize accurate protection in slope protection and has certain social benefits.
作者
李鹏
刘江鑫
韩志杰
宋常军
卞晓琳
LI Peng;LIU Jiangxin;HAN Zhijie;SONG Changjun;BIAN Xiaolin(Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处
《交通节能与环保》
2024年第1期121-127,共7页
Transport Energy Conservation & Environmental Protection
关键词
公路工程
红黏土边坡
破坏机理
稳定性评价
数值模拟
highway engineering
red clay slope
failure mechanism
stability evaluation
numerical simulation
