锚杆作用下块状岩体力学特性试验研究  

Experimental study on the mechanical properties of lumpy rock mass under bolt reinforcement

作　　者：朱文心[1,2] 靖洪文 张力[1] 陈敏亮[1] 苏海健 ZHU Wenxin1＇2, JING Hongwen1, ZHANG Li1, CHEN Minliang1, SU Haijian1(1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining ＆ Technology, Xuzhou, Jiangsu 221116, China; 2. School of Traffic and Civil Engineering, ShandongJiaotongUniversity, Jinan, Shandong 250357, Chin)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]山东交通学院交通土建工程学院,山东济南250357

出　　处：《采矿与安全工程学报》2018年第2期261-266,290,共7页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2017YFC0603001);国家自然科学基金项目(51704279;51734009)

摘　　要：以巷道围岩的一个单元为研究对象,通过研制成套的相似材料和加载模具,对边长200 mm的立方体试样进行压缩试验,研究块体尺寸和锚固方式对块状岩体力学行为的影响。试验结果表明:块体尺寸越大,锚杆与岩体的黏结性能越强,可以更好地发挥锚杆的支护作用,随着层理面间距的增大,岩体峰值强度和弹性模量均呈现逐渐增大的趋势;与端锚相比,加长锚和全锚更能提高锚杆与破裂岩体的黏结能力,抑制脱锚现象的发生,增加支护效果,随着锚固长度的增大,岩体峰值强度和弹性模量均逐渐增大。研究成果可为煤矿巷道破裂围岩的锚杆支护设计和失稳破坏预警预测提供理论依据。Taking a unit of surrounding rock mass as the research object, through developing a set of similar materials and loading molds, compressive tests on cube samples with the side length of 200 mm are performed to study the influence of block size and anchoring patterns on the mechanical behaviors of rock mass. The test results show that： when the block size is larger, the bonding performance between the bolt and rock mass is stronger and the bolt can play a better supporting role; when the bedding sur- face spacing is increased, both the peak strength and the elastic modulus of the rock mass present a gradually increasing trend. Compared with the end anchorage, both the extended anchorage and the full anchorage can further improve the bonding ability between the bolt and rock mass and inhibit the phe- nomenon of de-anchoring and increase the support effects. With increasing the anchorage length, both peak strength and elastic modulus of the rock mass can increase gradually. The research findings can provide a certain theoretical basis to the rock bolt support design and warning forecast of destabilizing destruction for broken surrounding rock in coal seam roadways.

关 键 词：块状岩体 破坏特征 强度 锚固方式 锚杆轴力 

分 类 号：TD353[矿业工程—矿井建设]