摘要
深部硬岩隧洞开挖卸荷常诱发高强度岩爆灾害,岩爆已成为影响隧洞工程安全建设的关键问题。物理模型试验作为研究深部隧洞开挖工程的重要手段之一,其材料的性质特征对试验结果影响很大,配制出适合开展岩爆物理模型试验的模型材料是研究的关键。在传统岩爆模型材料研制的基础上,通过引入岩爆倾向性指数和脆性评价指标,采用正交设计法和敏感性分析,开展低强度、高脆性的岩爆模型材料配比试验研究。试验选择石英砂含量、重晶石粉含量、高强石膏与水泥质量比和水含量4个影响因素,每个因素设置5个设计水平,共25组配比方案。每组配比方案均测定模型材料的强度、力学参数、岩爆倾向性指数和脆性评价指标,并研究这些参数和指标随4个影响因素在不同设计水平下的变化规律。最后,针对挑选出的岩爆模型材料,分析讨论了各影响因素与岩爆倾向性、脆性之间的相互关系。试验结果表明:基于岩爆倾向性指数和脆性评价指标,所配制的岩爆模型材料满足物理模型试验要求;配制岩爆模型材料重点要控制重晶石粉和水的含量,并合理调节高强石膏与水泥质量比。
The excavation unloading activities in deep hard rock tunnels often induce high-intensity rockburst disasters,which has become a key issue affecting the safety construction of tunnels.The physical model test is an important method to study the deep tunnel excavation,and the properties of model materials have great influences on the testing results.Thus,it is the key to prepare materials suitable for the physical model test.Based on the development of the traditional rockburst model materials,this paper introduces the rockburst proneness index and brittleness evaluation index.Combing with the orthogonal design method and sensitivity analysis,the experiments were carried out to investigate the rockburst model materials with low-strength and high-brittleness.We analyzed five influencing factors,including the quartz sand content,barite content,water content and the mass ratio of high-strength gypsum and cement.Each factor was set at five levels,a total of 25 matching schemes.The material strength,mechanical parameters,rockburst proneness index and brittleness evaluation index of model materials were measured in each matching scheme,and the variation of these parameters and indexes were studied under different design levels.Finally,the relationships among the influencing factors,rockburst proneness and brittleness of the selected rockburst model materials were discussed.The results show that:1)According to the rockburst proneness index and brittleness evaluation index,the prepared model materials meet the requirements of the physical model tests.2)It is important to control the contents of barite powder and water and to adjust the mass ratio of high-strength gypsum to cement properly.
作者
周辉
陈珺
张传庆
朱勇
卢景景
姜玥
ZHOU Hui;CHEN Jun;ZHANG Chuan-qing;ZHU Yong;LU Jing-jing;JIANG Yue(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2019年第6期2039-2049,共11页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51427803,No.51409102)
国家重点基础研究发展计划(973计划)项目(No.2014CB046902)
中国科学院科研仪器设备研制项目(No.YZ201553,No.YZ201344)~~
关键词
脆性岩石
岩爆
模型材料
脆性指标
brittle rock
rockburst
model material
brittleness index
