基于岩石损伤与水力作用的顺层岩质边坡临界失稳高度研究  

Critical Instability Height of Bedding Rock Slope Based on Rock Damage and Hydraulic Pressure

作　　者：张勃成 唐辉明[1,2] 申培武 宁奕冰 夏丁[1] ZHANG Bocheng;TANG Huiming;SHEN Peiwu;NING Yibing;XIA Ding(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;Three Gorges Research Center for Geo-Hazards of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国地质大学(武汉)教育部三峡地质灾害研究中心,湖北武汉430074

出　　处：《安全与环境工程》2020年第2期42-49,共8页Safety and Environmental Engineering

基　　金：国家自然科学基金重点项目(41230637、41572279)。

摘　　要：顺层岩质边坡溃屈破坏一直是岩土工程领域的研究热点。首先介绍了直立层状岩质边坡在自重荷载作用下发生溃屈破坏的欧拉压杆失稳破坏模型,在考虑地下水对边坡稳定性影响的基础上,将该模型推广到顺层岩质边坡,建立了考虑水力作用的顺层岩质边坡失稳破坏模型及其临界失稳高度的计算方法,并对其进行了验证分析,结果表明岩层倾角α和内摩擦角?对顺层岩质边坡临界失稳高度有较大的影响,水力作用导致边坡的稳定性降低;然后,将岩石看作损伤地质材料,建立了考虑水力作用与岩石损伤的顺层岩质边坡临界失稳高度的计算模型;最后,结合具体工程案例对建立的模型进行验证,结果表明采用该模型计算得到的顺层岩质边坡临界失稳高度与实际边坡失稳破坏高度吻合度较高,证明该模型在工程应用中具有一定的可靠性和可行性。The buckling failure mechanism of bedding rock slope has been a research hotspot in the field of geotechnical engineering.This paper firstly introduces the failure model of vertical rock stratum collapse induced by self-weight with Euler’s formula.Then,considering the influence of groundwater on the stability of the slope,the paper extends the model to the bedding rock slope,and establishes the failure model of the bedding rock slope considering the hydraulic pressure and the method to compute the critical instability height,and the analysis shows that the dip angle(α) and the inner friction(?) of strate has great influence on the calculation results of the critical instability height of the bedding rock slope,and the hydraulic pressure reduces the stability of the slope.Besides,regarding the rock as damaged material,the paper establishes a critical instability height model of bedding rock slope considering hydraulic pressure and damage mechanics.Finally,the paper validates the model with the case study.The results show that the critical instability height calculated by the proposed model is in good agreement with the actual failure height,which proves the reliability and feasibility of the proposed model in engineering practice.

关 键 词：顺层岩质边坡 临界失稳高度 水力作用 岩石损伤 压杆失稳 

分 类 号：X43[环境科学与工程—灾害防治] P642.22[天文地球—工程地质学]