电阻率法在深部巷道分区破裂探测中的应用
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摘要
淮南丁集煤矿西部采区南运输大巷埋深达955 m,已显现出深部开挖的特征。为研究深部巷道围岩破裂情况,在该巷道选取2个监测断面(宽5.0 m,高3.8 m),每个断面布置5个钻孔,测量围岩电阻率沿钻孔深度的变化。电阻率是岩石的重要电性参数,岩体的破碎程度对电阻率的影响较大,一般有裂纹的地方,电阻率产生突变。采用ResiTest–4000电阻率测试仪和研制的孔内探头,对钻孔内岩体电阻率进行测试。岩石破碎区电阻率基准值根据每一钻孔电阻率平均值(剔除特异点)确定,大于基准值的为破碎区。根据测试结果,绘制巷道围岩分区破裂图,与钻孔电视观测结果较吻合。结果表明,该巷道围岩有4个破裂分区;破裂分区带的半径与巷道半径基本呈线性关系;巷道周边破裂区宽度最大,平均达到3.12 m,依次分区破裂带的宽度有递减趋势。
South transportation roadway of depth of 955 m in Huainan Dingji Mine western coal area has shown the characteristics of the deep excavation.In order to investigate fracturing behavior of the surrounding rock in the deep roadway,two sections(the width is 5.0 m,and the height is 3.8 m) are selected.Five boreholes are drilled as fan array in the arch of the every section.The variation of electrical resistivity of surrounding rock with borehole depth can be measured.Electrical resistivity is one of the important electric parameters for rocks.The degree of rock mass fracturing has great influence on electric resistivity;and generally electrical resistivity changes suddenly in the fractural location.Using ResiTest–4000 resistivity tester and self-developed downhole probe,the electric resistivity of rock mass in the boreholes is tested.A reference value of electrical resistivity on disintegrated zones of rock mass can be determined according to average electrical resistivity(to reject abnormal data) in every hole;and the ones greater than the reference values are disintegrated rock mass.According to the test resultst,he diagrams of zonal disintegration distribution of surrounding rock of the roadway are drawn.In addition,the diagrams are in agreement with ones obtained from borehole TV video.The results show that there are four disintegration zones in the surrounding rock of the roadway;the radius of the disintegrated zones has a linear relationship with the radius of the roadway;the thickness of the disintegrated zones near the roadway boundary is maximal and up to 3.12 m;and the thickness of disintegrated zones decreases in turn with borehole depth.
South transportation roadway of depth of 955 m in Huainan Dingji Mine western coal area has shown the characteristics of the deep excavation.In order to investigate fracturing behavior of the surrounding rock in the deep roadway,two sections(the width is 5.0 m,and the height is 3.8 m) are selected.Five boreholes are drilled as fan array in the arch of the every section.The variation of electrical resistivity of surrounding rock with borehole depth can be measured.Electrical resistivity is one of the important electric parameters for rocks.The degree of rock mass fracturing has great influence on electric resistivity;and generally electrical resistivity changes suddenly in the fractural location.Using ResiTest–4000 resistivity tester and self-developed downhole probe,the electric resistivity of rock mass in the boreholes is tested.A reference value of electrical resistivity on disintegrated zones of rock mass can be determined according to average electrical resistivity(to reject abnormal data) in every hole;and the ones greater than the reference values are disintegrated rock mass.According to the test resultst,he diagrams of zonal disintegration distribution of surrounding rock of the roadway are drawn.In addition,the diagrams are in agreement with ones obtained from borehole TV video.The results show that there are four disintegration zones in the surrounding rock of the roadway;the radius of the disintegrated zones has a linear relationship with the radius of the roadway;the thickness of the disintegrated zones near the roadway boundary is maximal and up to 3.12 m;and the thickness of disintegrated zones decreases in turn with borehole depth.
引文
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[2]顾金才,顾雷雨,陈安敏,等.深部开挖洞室围岩分层断裂破坏机制模型试验与分析[J].岩石力学与工程学报,2008,27(3):433–438.(GU Jincai,GU Leiyu,CHEN Anmin,et al.Model test study on mechanism of layered fracture within surrounding rock of tunnels in deep stratum[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):433–438.(in Chinese))3]КУРЛЕНЯМВ,ОПАРИНВН.Лроблемынелинейнойгеомеханики[J].Ч.I.Фтпрпи,1999,(3):12–23.
[4]SHEMYAKIN E I,KURLENYA M V,OPARIN V N,et al.Zonal disintegration of rocks around underground workings,part IV:practical applications[J].Journal of Mining Science,1989,25(4):297–302.
[5]METLOV L S,MOROZOV A F,ZBORSHCHIK M P.Physical foundations of mechanism of zonal rock failure in the vicinity of mine working[J].Journal of Mining Science,2002,38(2):150–155.
[6]周小平,钱七虎.深埋巷道分区破裂化机制[J].岩石力学与工程学报,2007,26(5):877–885.(ZHOU Xiaoping,QIAN Qihu.Zonal fracturing mechanism in deep tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(5):877–885.(in Chinese))
[7]李英杰,潘一山,章梦涛.深部岩体分区碎裂化进程的时间效应研究[J].中国地质灾害与防治学报,2006,17(4):119–122.(LI Yingjie,PAN Yishan,ZHANG Mengtao.Time effect on zonal disintegration process of deep rock mass[J].The Chinese Journal of Geological Hazard and Control,2006,17(4):119–122.(in Chinese))
[8]SHEMYAKIN E I,FISENKO G L,KURLENYA M V,et al.Zonal disintegration of rocks around underground workings,part I:data of in-situ observations[J].Journal of Mining Sciences,1986,22(3):157–168.
[9]涂敏.潘谢矿区采动岩体裂隙发育高度的研究[J].煤炭学报,2004,29(6):641–645.(TU Min.Study on growth height of separation fracture of mining rock in Panxie Area[J].Journal of China Coal Society,2004,29(6):641–645.(in Chinese))
[10]刘泉声,张华,林涛.煤矿深部岩巷围岩稳定与支护对策[J].岩石力学与工程学报,2004,23(21):3 732–3 737.(LIU Quansheng,ZHANG Hua,LIN Tao.Study on stability of deep rock roadways in coal mines and their support measures[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(21):3 732–3 737.(in Chinese))
[11]嵇艳鞠,林君,朱凯光,等.利用瞬变电磁技术进行地下水资源勘察[J].工程勘察,2005,(3):64–67.(JI Yanju,LIN Jun,ZHU Kaiguang,et al.Underground water prospecting by transient electromagnetic method[J].Geotechnical Investigation and Surveying,2005,(3):65–67.(in Chinese))
[12]张流,黄建国,高平.水对岩石变形过程中电阻率变化的影响[J].地震,2003,23(1):8–14.(ZHANG Liu,HUANG Jianguo,GAO Ping.Influence of water on electric resistivity of deforming rock samples[J].Earthquake,2003,23(1):8–14.(in Chinese))
[13]GLOVER P W J.Modeling the stress-strain behavior of saturated rocks undergoing triaxial deformation using complex electrical conductivity measurements[J].Surveys in Geophysics,1996,17(3):307–330.
[14]邓少贵,范宜仁,段兆芳,等.多温度多矿化度岩石电阻率试验研究[J].石油地球物理勘探,2000,35(6):763–767.(DENG Shaogui,FAN Yiren,DUAN Zhaofang,et al.Experiment study of rock resistivity with multi-temperature and multi-salinity[J].Oil Geophysical Prospecting,2000,35(6):763–767.(in Chinese))
[15]TOMECKA-SUCHON S,RUMMEL F.Fracture-induced resistivity changes in granite[J].International Journal of Rock Mechanics and Mining Sciences,1992,29(6):583–588.
[16]陆阳泉,刘建毅,梁子斌.受载条件下大型灰岩样品的电阻率前兆特征[J].华南地震,1998,18(3):21–27.(LU Yangquan,LIU Jianyi,LIANG Zibin.The resistivity precursor features of the large-scale limestone sample under loading condition[J].South China Journal of Seismology,1998,18(3):21–27.(in Chinese))
[17]王云刚,王恩元,李忠辉,等.受载煤岩电阻率变化的试验研究[OL].http://www.paper.edu.cn,2007.(WANG Yungang,WANG Enyuan,LI Zhonghui,et al.Experimental study on the electric resistivity of loaded coal samples[OL].http://www.paper.edu.cn,2007.(in Chinese))
[18]李术才,王汉鹏,钱七虎,等.深部巷道围岩分区破裂化现象现场监测研究[J].岩石力学与工程学报,2008,27(8):1 545–1 553.(LI Shucai,WANG Hanpeng,QIAN Qihu,et al.In-situ monitoring research on zonal disintegration of surrounding rock mass in deep mine roadways[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1 545–1 553.(in Chinese))
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