岩土工程学报Issue(9)：1666-1673,8.DOI:10.11779/CJGE201409013
高应力软岩巷道可接长锚杆让压支护技术
Yieldable technology of lengthened bolts for high-stress soft rock roadways
摘要
Abstract
Due to their large deformation and plastic zones, the high-stress soft rock roadways, for stability control, need the support materials which have high elongation, and are anchored to the deep layer of the roof rock. Based on the theory of“strong support and yield pressure”, a new type of lengthened bolt is invented to adapt to the deformation and failure of the soft rock roadways. Its length, elongation and broken load are 4 m, 17% and 195 kN, respectively. The constitutive models for lengthened bolt support system and bolt-cable support system are established. The result shows that the upper limit strain of constitutive model for support system should not exceed the maximum strain of support materials in order to guarantee the stability of support structure. The new lengthened bolt can provide more yield-pressure distance than the cable, which exactly assures both the stability and the support strength of the lengthened bolt support system in soft rock roadways. Under the experimental conditions, the resistance of the lengthened bolt support is about 170.2 kN, and the theoretical rock deformation, 0 m to 4 m away from the roadway roof, is 264 mm, which is close to the actual deformation value. The goal of“yield support”in high-stress soft rock roadways is effectively achieved.关键词
可接长锚杆/让压支护/软岩巷道/本构模型/支护系统Key words
lengthened bolt/yield support/soft rock roadway/constitutive model/support system分类
建筑与水利引用本文复制引用
王飞,刘洪涛,张胜凯,孙建辉,李育吉,蔡猛..高应力软岩巷道可接长锚杆让压支护技术[J].岩土工程学报,2014,(9):1666-1673,8.基金项目
国家自然科学基金项目（51204187，51234005）；北京高等学校青年英才计划项目 （）
