Development and application of a surrounding rock digital drilling test system of underground engineering
WANG Qi1，2，GAO Hongke1，2，JIANG Zhenhua1，LI Shucai1，JIANG Bei1，2，3
(1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；3. School of Civil Engineering and Architecture，University of Jinan，Jinan，Shandong 250022，China)
Abstract：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 rock masses.
王 琦1，2，高红科1，2，蒋振华1，李术才1，江 贝1，2，3. 地下工程围岩数字钻探测试系统研发与应用[J]. 岩石力学与工程学报, 2020, 39(2): 301-310.
WANG Qi1，2，GAO Hongke1，2，JIANG Zhenhua1，LI Shucai1，JIANG Bei1，2，3. Development and application of a surrounding rock digital drilling test system of underground engineering. , 2020, 39(2): 301-310.
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2020, Vol. 39 
