摘要
为了实现对巷道开挖卸荷过程中真实加、卸载过程的模拟,掌握巷道(隧道)围岩在开挖卸荷条件下的变形规律及破坏机制,采用具有自主知识产权的巷道围岩开挖卸荷模型试验系统,对有机玻璃围岩试件进行开挖卸荷条件下巷道围岩二次应力状态弹性阶段的模拟试验,并与已成熟的巷道围岩二次应力状态弹性阶段的理论解析进行对比分析。试验过程中监测到围岩试件的变形朝向洞内,试件内侧的变形要大于外侧,即离洞壁越近,围岩变形越大,且整个变形过程呈现弹性特征。对比围岩试件的卸荷应变试验值与所求得的理论值,分析结果表明,试验结果可以与理论值很好地对应,且变化趋势相同,理论值稍大于试验值,从而验证了所构建试验系统的性能稳定性及试验模拟方法的可行性。目前的巷道围岩弹性理论的求解是可以验证的。
In order to simulate actual loading and unloading process and grasp the deformation law and failure mechanism of surrounding rocks of roadway(tunnel)during excavation and unloading of the roadway,the model test on PMMA surrounding rock specimen in the elastic stage of secondary stress state of roadway surrounding rock under excavation unloading condition was carried out with roadway surrounding rock excavation unloading model test system with proprietary intellectual property rights.And the testing results were compared and analyzed with well-established theoretical knowledge of elastic stage of secondary stress state of roadway surrounding rock.As monitored during the test,the deformation of the surrounding rock specimen was toward the cave,and the inner side of the specimen was larger than that in its outside;that is,the closer it was to the wall of the tunnel,the greater the denaturation of surrounding rock was,and the whole denaturation process presented elastic characteristics.The comparision of the unloading strain test value of surrounding rock specimen with the theoretical value obtained has showed good correspondence between the two with consistent variation trend and a slightly bigger theoretical value,which verifies the performance stability of the constructed test system and the feasibility of the test simulation method.The current solution of the elastic theory of roadway surrounding rock can be verified.
作者
李小瑞
侯公羽
吕文涛
李巧燕
LI Xiaorui;HOU Gongyu;LYU Wentao;LI Qiaoyan(College of Geological Engineering,Institute of Disaster Prevention,Sanhe,Hebei 101601,China;Hebei Key Laboroatory of Earthquake Disaster Prevention and Risk Assessment,Sanhe,Hebei 101601,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;China Construction Third Engineering Bureau Co Ltd(Beijing),Beijing 100089,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2021年第2期269-275,共7页
Journal of Mining & Safety Engineering
基金
中央高校基本科研业务费专项资金项目(ZY20180230)
国家自然科学基金项目(51574247)。
关键词
应力状态
围岩试件
开挖卸荷
模型试验
理论求解
stress condition
surrounding rock specimen
excavation unloading
model test
theoretical solution
作者简介
李小瑞(1987-),女,河南省沈丘县人,博士,讲师,主要从事岩土工程、城市地下空间工程方面的研究。E-mail:lixiaorui551234@163.com.Tel:15652298230。
