地下工程围岩数字钻探测试系统研发与应用  

Development and application of a surrounding rock digital drilling test system of underground engineering

作　　者：王琦[1,2] 高红科[1,2] 蒋振华 李术才 江贝[1,2,3] WANG Qi;GAO Hongke;JIANG Zhenhua;LI Shucai;JIANG Bei(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan,Shandong 250061,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Civil Engineering and Architecture,University of Jinan,Jinan,Shandong 250022,China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [3]济南大学土木建筑学院,山东济南250022

出　　处：《岩石力学与工程学报》2020年第2期301-310,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51874188,51674154,51704125)。

摘　　要：岩体力学参数与结构特征是地下工程稳定性分析的基础,围岩参数的实时获取对支护设计至关重要。地下工程建设常面临高应力、极软岩等复杂地质条件,导致围岩松散破碎,锚注支护是破碎围岩控制的有效方法,注浆前后破碎围岩体的力学性能是锚注参数设计的基本依据。数字钻探测试技术为实现围岩参数实时获取与锚注效果定量评价提供了新的手段。在前期岩体力学随钻理论研究、多功能真三轴岩体钻探测试系统(室内TRD系统)自主研制与大量室内试验的基础上,研发了本安型地下工程围岩数字钻探测试系统(现场SDT系统),基于该系统开展了完整岩石层、破碎岩体层和注浆岩体层等不同组合条件下分层岩体的数字钻探试验,结果显示:(1)现场SDT系统控制和监测性能良好,与室内TRD系统匹配程度高;(2)随钻参数在岩层界面处响应明显,基于现场SDT系统测试的岩体等效单轴抗压强度、黏聚力和内摩擦角与室内岩石力学测试结果的平均差值率均小于15%;(3)基于现场SDT系统测试的注浆后破碎岩层等效单轴抗压强度为注浆前的3.5倍。现场SDT系统可有效实现岩层界面准确识别、岩体等效力学参数实时测试和破碎岩体注浆效果定量评价。The mechanical parameters and structural characteristics of rock masses are the basis of stability analysis of underground engineering,and real-time obtaining surrounding rock parameters are very important for support design.Complex geological conditions such as high stress and extremely soft rock,resulting in loose and broken surrounding rock,are often encountered during underground engineering construction,and bolt-grouting support is an effective method to control the fractured surrounding rock.The mechanical property of the surrounding rock before and after grouting is the basis for the design of bolt-grouting parameters.The digital drilling test technique provides a new way to real-time obtain the surrounding rock parameters and to quantitatively evaluate the bolt-grouting effect.Based on the previous drilling theory of rock mechanics,the development of multi-function true triaxial rock drilling test system(indoor TRD system)and a large number of indoor tests,an intrinsically safe surrounding rock digital drilling test system of underground engineering(Site SDT system)is developed,and digital drilling tests on layered rock masses composed of different combinations of intact,fractured and grouted rock layers are conducted based on site SDT system.The test results show that the site SDT system has an excellent controlling and monitoring performance and highly matches with the indoor TRD system.The response of the drilling parameters at rock layer interfaces is obvious,and the average values of difference value ratios of equivalent uniaxial compressive strength,cohesion and internal friction angle obtained from site SDT system test and indoor rock mechanics test are less than 15%.The equivalent uniaxial compressive strength of fractured rock stratum after grouting is 3.5 times of that before grouting obtained by site SDT system test.Site SDT system can accurately identify rock layer interfaces,test equivalent rock mechanical parameters in real time and quantitatively evaluate the grouting effect of fractured ro

关 键 词：岩石力学 数字钻探 测试系统 岩体参数 破碎围岩 注浆评价 

分 类 号：TU45[建筑科学—岩土工程]