平行钻孔-套筒致裂法测试地应力试验研究及工程应用
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摘要
针对套筒致裂法测试深井地应力存在的技术瓶颈,改进了套筒致裂法测地应力的套筒膨胀管装置;综合单孔套筒致裂法和控制致裂法的特点,提出了可操作性更强的平行钻孔-套筒致裂法地应力测试技术,通过试验对原有的单孔套筒致裂法和控制致裂法地应力计算公式进行了合理修正。由试验结果可得,单孔套筒致裂的修正系数为0.78,控制致裂的修正系数为0.83。现场地应力测试结果表明:朱集东煤矿-965 m轨道大巷最大主应力为23.16 MPa,东西水平方向;中间主应力为21.04 MPa,铅垂方向;最小主应力为13.01 MPa,南北水平方向。
In view of limitations of the sleeve fracturing method for deep in-situ stress testing, a sleeve expansion pipe was improved for ground stress measurement. Synthesizing the characteristics of single-hole sleeve fracturing method and control fracturing method, a more operable ground stress measurement technology of parallel boreholes sleeve fracturing method was provided in this paper. Additionally, the formulas for the single-hole sleeve fracturing and the control fracturing were modified reasonably through the testing. The results show that the correction coefficients obtained for single-hole sleeve fracturing method was 0.78, while that for control fracturing method was 0.83. In-situ test was carried out for main track roadway buried in 965 m underground located at Zhuji east coal mine. The test results show that the maximum principal stress is 23.16 MPa in the west-east direction, the intermediate principal stress is 21.04 MPa in the vertical direction, and the minimum principal stress is 13.01 MPa in the north-south direction.
In view of limitations of the sleeve fracturing method for deep in-situ stress testing, a sleeve expansion pipe was improved for ground stress measurement. Synthesizing the characteristics of single-hole sleeve fracturing method and control fracturing method, a more operable ground stress measurement technology of parallel boreholes sleeve fracturing method was provided in this paper. Additionally, the formulas for the single-hole sleeve fracturing and the control fracturing were modified reasonably through the testing. The results show that the correction coefficients obtained for single-hole sleeve fracturing method was 0.78, while that for control fracturing method was 0.83. In-situ test was carried out for main track roadway buried in 965 m underground located at Zhuji east coal mine. The test results show that the maximum principal stress is 23.16 MPa in the west-east direction, the intermediate principal stress is 21.04 MPa in the vertical direction, and the minimum principal stress is 13.01 MPa in the north-south direction.
引文
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[13]侴万禧,李炜,魏善斌,等.巷道围岩应力的套筒致裂测试及原岩应力的推算[J].岩石力学与工程学报,1996,15(1):40-47.CHOU Wanxi,LI Wei,WEI Shanbin.Calculation of the sleeve of roadway surrounding rock stress cracking test and the original rock stress[J].Chinese Journal of Rock Mechanics and Engineering,1996,15(1):40-47.
[14]魏善斌,侴万禧.岩石试件抗拉强度的套筒致裂法试验研究[J].西安矿业学院学报,1996,16(3):235-238.WEI Shanbin,CHOU Wanxi.Tensile strength of rock sample by sleeve fracturing method experimental study[J].Journal of Xi’an Mining Institute,1996,16(3):235-238.
[15]李炜.围岩应力的测试及原岩应力的推算[D].淮南:安徽理工大学,1995.
[16]CHARSLEY A D.Interpretation of sleeve fracturing for stress measurement[D].Sudbury:School of Graduate Studies and Research Laurentian University,2000.
[17]侴万禧.巷道围岩三维应力的边界元分析[J].淮南矿业学院学报,1986,6(1):22-31.CHOU Wanxi.Boundary element analysis of threedimensional stress of roadway surrounding rock[J].Journal of Huainan Mining Institute,1986,6(1):22-31.
[2]蔡美峰.地应力测量原理和技术[M].北京:科学出版社,2000:38-42.
[3]程帅,荣传新,孙东霞,等.深部矿井地应力套筒致裂法测试技术[J].煤炭科学技术,2011,39(12):1-5.CHENG Shuai,RONG Chuanxin,SUN Dongxia,et al.Ground stress measuring technology with casing fractur-ing method in deep mine[J].Coal Science and Technology,2011,39(12):1-5.
[4]STEPHANSSON O.套管致裂法测量岩体应力[C]//岩石力学进展与工程应用译文集.北京:科学出版社,1987:223-233.
[5]CHANDLER N A.An energy approach to sleeve fracture stress measurements[D].Winnipeg:University of Manitoba,1989.
[6]魏善斌.套筒致裂法地应力量测[D].淮南:安徽理工大学,1989.
[7]侴万禧,魏善斌.套筒致裂岩体应力量测的模型试验研究[J].岩石力学与工程学报,1990,9(3):228-237.CHOU Wanxi,WEI Shanbin.Model test study of sleeve fracturing rock stress measurement[J].Chinese Journal of Rock Mechanics and Engineering,1990,9(3):228-237.
[8]侴万禧,魏善斌.巷道围岩应力及力学性质的套筒致裂试验研究[J].岩石力学与工程学报,1992,11(2):200-208.CHOU Wanxi,WEI Shanbin.Sleeve fracturing test research of the surrounding rock stress and mechanical properties[J].Chinese Journal of Rock Mechanics and Engineering,1992,11(2):200-208.
[9]侴万禧,李炜.依据钻孔应力变化确定原岩应力的平行钻孔-控制致裂法研究[J].淮南矿业学院学报,1995,15(4):24-27.CHOU Wanxi,LI Wei.According to borehole stress changes to determine the original rock stress parallel boreholes-controlled fracturing method research[J].Journal of Huainan Mining Institute,1995,15(4):24-27.
[10]侴万禧,李炜.控制致裂岩体应力量测的模型试验研究[J].实验力学,1996,11(2):121-128.CHOU Wanxi,LI Wei.Model test study of control fracturing rock stress measurement[J].Journal of Experimental Mechanics,1996,11(2):121-128.
[11]侴万禧.控制致裂岩体应力测试原理[J].中国矿业大学学报,1996,25(1):40-45.CHOU Wanxi.The theory of control fracturing rock stress measurement[J].Journal of China University of Mining&Technology,1996,25(1):40-45.
[12]李炜,侴万禧.用于裂隙岩体应力测试的套筒致裂法[J].矿山压力与顶板管理,1996,13(1):57-59.LI Wei,CHOU Wanxi.Sleeve fracturing method for fractured rock mass stress testing[J].Ground Pressure and Strata Control,1996,13(1):57-59.
[13]侴万禧,李炜,魏善斌,等.巷道围岩应力的套筒致裂测试及原岩应力的推算[J].岩石力学与工程学报,1996,15(1):40-47.CHOU Wanxi,LI Wei,WEI Shanbin.Calculation of the sleeve of roadway surrounding rock stress cracking test and the original rock stress[J].Chinese Journal of Rock Mechanics and Engineering,1996,15(1):40-47.
[14]魏善斌,侴万禧.岩石试件抗拉强度的套筒致裂法试验研究[J].西安矿业学院学报,1996,16(3):235-238.WEI Shanbin,CHOU Wanxi.Tensile strength of rock sample by sleeve fracturing method experimental study[J].Journal of Xi’an Mining Institute,1996,16(3):235-238.
[15]李炜.围岩应力的测试及原岩应力的推算[D].淮南:安徽理工大学,1995.
[16]CHARSLEY A D.Interpretation of sleeve fracturing for stress measurement[D].Sudbury:School of Graduate Studies and Research Laurentian University,2000.
[17]侴万禧.巷道围岩三维应力的边界元分析[J].淮南矿业学院学报,1986,6(1):22-31.CHOU Wanxi.Boundary element analysis of threedimensional stress of roadway surrounding rock[J].Journal of Huainan Mining Institute,1986,6(1):22-31.