裂隙膨润土边坡稳定性及锚固特性研究  

Study on Stability and Anchorage Characteristics of Fractured Bentonite Slope

作　　者：王龙 冯健雪[3] 刘文化 李志华[1] WANG Long;FENG Jianxue;LIU Wenhua;LI Zhihua(School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;Architectural Engineering College,Guizhou Minzu University,Guiyang 550025,China)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]南京工业大学岩土工程研究所,南京210009 [3]贵州民族大学建筑工程学院,贵阳550025

出　　处：《路基工程》2022年第6期29-35,共7页Subgrade Engineering

基　　金：地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2022K002);江苏省自然科学基金(BK20210479);广西防灾减灾与工程安全重点实验室开放基金(2020ZDK010)。

摘　　要：基于极限分析上限定理,对含裂隙膨润土边坡的稳定性及其预应力锚索加固措施开展研究,结合平动机构和旋转机构,提出一种平动-旋转组合机构评估含裂隙膨润土边坡的稳定性;并基于空间离散技术建立含裂隙膨润土边坡半解析分析方法,研究裂隙特征和吸力效应对其稳定性的影响机制,探究预应力锚索的加固效应及锚索最优化布设方案。结果表明:膨润土边坡稳定性及锚索锚固效应均与裂隙特征密切相关,裂隙高度对边坡稳定性的影响存在临界值,超过该临界值边坡稳定性将显著降低,锚索最优倾角随锚头埋设高度和内摩擦角的增大而减小。Based on the upper limit theorem of limit analysis,the stability of bentonite slope containing fractures and the reinforcement measures of prestressed anchor cable are studied.Combining the translation and the rotation mechanisms,a translation-rotation combined mechanism is proposed to evaluate the stability of bentonite slope containing fractures.The semi-analytical analysis method of bentonite slope containing fractures is established based on spatial discrete technology,and the influence mechanism of fracture characteristics and suction effect on its stability is studied,and the reinforcement effect of prestressed anchor cable and the optimal layout scheme of anchor cable are explored.The results indicate that the stability of bentonite slope and anchorage effect of anchor cable are closely related to fracture characteristics.There is a critical value for the influence of fracture height on slope stability,beyond which the slope stability will be significantly reduced.The optimal dip angle of anchor cable decreases with the increase of anchor head embedding height and internal friction angle.

关 键 词：膨润土边坡 极限分析 预应力锚索 平动-旋转组合机构 基质吸力 

分 类 号：TU43[建筑科学—岩土工程]