顺层岩质边坡预支护开挖及锚索优化设计研究  

Study on Pre-supporting Excavation of Bedding Rock Slope and Anchor Optimization Design

作　　者：王智德[1] 夏元友[1] 周雄[1] 夏国邦 杨金华[1,3] 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]云南省公路开发投资有限公司,昆明650101 [3]云南交通职业技术学院建筑工程系,昆明650101

出　　处：《地下空间与工程学报》2014年第6期1400-1407,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金面上项目(51374163);云南省交通运输厅2010科技专项(云交科2010(A)07-a)

摘　　要：针对顺层岩质边坡开挖可能失稳或者不确定其稳定性时,提出预留开挖区内先进行预支护,再进行逐层开挖的方法,在此基础上,进一步研究岩层走向与坡面走向不同夹角下锚索预支护的最佳水平角,建立考虑走向夹角的支护计算模型,推导得到相应的关系式。利用数值计算对比边坡开挖方法对边坡的整体稳定性以及锚索的加固效果,结果表明:此开挖方法结合考虑锚索最佳方向角的支护能够更有效地限制边坡的应力与变形,对提高边坡的稳定性有一定的贡献。方法是可行的,在实际边坡加固设计及工程施工能提供相应的参考。Considering the instability and uncertainty of the bedding rock slope under excavation,an excavation method is put forward： pre-supporting the slope in reserved area,then excavating the slope stratum by stratum. On this basis,optimal horizontal anchor angle under pre-support of anchor bolt is further studied after considering the different angles of stratum direction and slope plane direction,and the calculation model of slope supporting is set up,then the corresponding relational expression is deduced. Based on numerical calculation,the global stability of the slope and the reinforcing effect of anchor cable are compared under different slope excavation methods. The result shows that the supporting which takes the optimal direction angle of the anchor cable into consideration is much more effective in limiting the stress and deformation of the slope,and it makes some contribution towards improving the stability of the slope. This method is feasible,and it provides a reference for actual slope reinforcement design and engineering construction.

关 键 词：顺层岩质边坡 锚索 预支护 稳定性分析 最佳水平角 

分 类 号：U417.1[交通运输工程—道路与铁道工程]