摘要
新型复合锚固结构是指"锚杆-构造措施"型复合锚固结构,用于洞室的加固支护。"构造措施"是指在锚杆里端规律设置一段表面经过处理的空孔。这段空孔对周围介质起弱化作用,因而称为"弱化孔"。新型复合锚固结构优化设计因素包括:①弱化孔直径d;②弱化孔密度;③弱化孔长度l;④锚固区厚度t。利用LS-DYNA程序依次对4个因素的优化设计进行了数值计算分析,得出:弱化孔直径的优化设计值为d=1.0 cm;弱化孔密度的优化设计为沿环向布设24个弱化孔;弱化孔长度的优化设计值是l=25 cm;锚固区厚度的优化设计值是t=25 cm(或锚固区厚度与弱化孔长度的比值为1)。
The new composite anchorage structure indicates the ‘bolt-tectonic measure’ composite anchorage structure,it is applied to cavity reinforcement and support.‘Tectonic measure’ indicates to construct a section of empty hole located at the end of inner bolt with processing the hole surface.This section of empty hole can weaken the medium,and it is named as ‘weakening hole’.The optimum design factors of the new composite anchorage structure include: ① weakening hole diameter,d;② weakening density;③ weakening length,l;④ anchorage zone thickness,t.The optimum design of the above four factors is analyzed through numerical simulation with LS-DYNA code.The conclusions show that: optimum weakening hole diameter,d = 1.0;optimum design of weakening hole density is 24 weakening holes along cavity circle;optimum weakening hole length,l = 25 cm;optimum anchorage zone thickness,t = 25 cm(or the ratio of anchorage zone thickness to weakening hole length is 1).
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第S1期276-281,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.10772199)
关键词
锚固结构
爆炸
优化
洞室
anchorage structure
explosion
optimization
cavity
