摘要
为探讨基于围岩塑性破裂区分布的深部巷道精准注浆加固技术,推导得高地应力下非等压二区破坏圆形巷道的应力和塑性破裂区范围的理论解,并结合COMSOL软件,揭示侧压系数、围岩软弱破裂程度和注浆加固对其的影响规律。结果表明:随侧压系数增大,顶底板内的环向应力和塑性破裂区范围显著增大而巷帮的却减小;围岩软弱破裂程度越高,其最大环向应力越小而塑性破裂区范围越大,故决定塑性破裂区范围的是最大环向应力所在位置距巷道表面的距离;塑性破裂区在侧压系数、黏聚力和内摩擦角的不同组合下将呈圆形、类椭圆形和近似蝶形;注浆加固对具有不同可注性和可改造性围岩的塑性破裂区形态、位置和范围的影响不同。其成果可为高地应力巷道注浆加固等设计提供参考。
In order to study the precise grouting reinforcement technique for deep roadway based on the distribution characteristics of plastic fracture zone of surrounding rock,the theoretical solution of stress and the range of plastic fracture zone of circular roadway containing two failure zones under the non-equal compressive pressure and high ground stress has been derived.Furthermore,combined with the COMSOL software,the influence rule of the lateral pressure coefficient,the weakness or fracture degree of surrounding rock and the grouting on the stress fields and plastic fracture zone have been revealed.The results have shown that with the increase of lateral pressure coefficient,the circumferential stress and plastic fracture zone in the roof and floor increase significantly,whereas those in the roadway ribs decrease.The higher the weakness or fracture degree of surrounding rock,the smaller the maximum circumferential stress and the larger the range of plastic fracture zone,and it is determined by the distance of the position of maximum circumferential stress from the roadway surface.The morphology of plastic fracture zone will present round,elliptic and approximately butterfly shapes in different combinations of lateral pressure coefficient,cohesive force and internal friction angle.In addition,grouting reinforcement has different effects on the morphology,position and range of plastic fracture zone with different injectable and modifiable surrounding rocks,which can provide method reference and theoretical basis for the design of grouting reinforcement of fractured roadway with high ground stress.
作者
黄耀光
张天军
HUANG Yaoguang;ZHANG Tianjun(College of Sciences,Xi’an University of Science and Technology,Xi’an,Shaanxi710054,China;Center for Post-Doctoral Studies in Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an,Shaanxi710054,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第5期949-958,共10页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51604214,51774234)
中国博士后科学基金项目(2016M592818)
陕西省自然科学基金项目(2019JQ-381)
西安科技大学博士启动基金项目(2015QDJ071)
西安科技大学培育基金项目(201647)
关键词
侧压系数
围岩应力
塑性破裂区范围
破裂形态
注浆加固
lateral pressure coefficient
surrounding rock stress
scope of plastic fracture zone
fracture morphology
grouting reinforcement
