不同支护参数下锚杆锚固效果的等效数值模拟研究  

Equivalent numerical simulation study on bolt anchoring effects of different supporting parameters

作　　者：邵凌[1] 李宁[1] 李程[1] 代鹏[1] 陈瑛[1] 

机构地区：[1]上海理工大学环境与建筑学院,上海杨浦200093

出　　处：《水资源与水工程学报》2016年第6期207-211,216,共6页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(40872179);上海市自然科学基金项目(16ZR1423300)

摘　　要：为了研究支护参数（锚杆长度,锚杆环向间距）对数值模拟中围岩等效岩性参数的影响,以宁波将军山隧道为研究对象,进行了不同支护参数下的隧道开挖和加载的模型试验,得到锚杆长度和锚杆间距的改变对隧道拱顶位移的影响规律。通过对模型试验进行数值反演分析,得到数值模拟中围岩等效岩性参数（弹性模量、黏聚力和内摩擦角）的变化规律,依此得到不同支护参数下锚杆锚固效果的等效数值模拟方法。结果表明：在数值分析中,锚杆长度每增加0.5m,锚固区岩体弹性模量提高约3%,黏聚力提高约0.8%,内摩擦角几乎不变;锚杆间距每减小0.5m,锚固区岩体弹性模量提高约17%,黏聚力提高4%-5%,内摩擦角提高约3.4%。To research the influences of supporting parameters （ e. g. , bolt length and bolt circular spacing） on surrounding rock＇s equivalent lithological parameters in numerical simulation, the model tests tunnel＇s excavation and loading with different supporting parameters were conducted for Ningbo General mountain tunnel, the influences of changing bolt length and bolt spacing＂ on tunnel vault displacement were studied. Through the numerical inversion analysis of model tests, the variation of surrounding rock equivalent lithological parameters （modulus of elasticity, cohesion and angle of internal friction） in numerical simulation, and the method of equivalent numerical simulation of bolt anchoring effects in different supporting parameters were obtained, respectively. The results showed that, in numerical analysis, when the bolt length increased 0.5 m, the anchorage zone rock＇s elastic modulus increased by about 3%, the cohesive force increased by about 0.8% , but the angle of internal friction were almost unchanged; when the bolt spacing decreased 0.5 m, the anchorage zone rock＇s elastic modulus increased by about 17% , the cohesive force increased by about 4% to 5% , and the angle of internal friction increased by about 3.4%.

关 键 词：锚杆锚固 模型试验 支护参数 锚固效果 等效岩性参数 

分 类 号：TV554[水利工程—水利水电工程] TV314