某水工隧洞裂隙岩体高水头作用下的渗透性试验研究
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摘要
结合某抽水蓄能电站高压引水隧洞裂隙岩体的高压压水试验、常规压水试验和室内试验,分析了裂隙岩体在高水头条件下渗透流量与压力关系所反映的岩体渗透特性变化规律;在定量计算基础上探讨了裂隙岩体渗透系数与压力的相互关系。通过对比高压压水试验、常规压水试验和室内试验得到的渗透系数,分析了环境应力状态和压力变化对渗透系数取值影响的原因。研究结果表明,高水头作用下裂隙岩体的渗透系数明显大于低水压条件下的渗透系数,室内试验渗透系数因应力解除影响而大于原位压水试验渗透系数值。
Combined with high pressure permeability test,conventional pressure permeability test and indoor permeability test for fractured rock mass of high pressure water tunnel in one water-pumped storage power project,the variation law of rock mass permeability under high water pressure is analyzed to describe the relation between discharge and water pressure.Through the calculation of permeability coefficient of fractured rock mass,relation between water pressure and permeability coefficient is also discussed.By comparing the results of high pressure permeability test,conventional pressure permeability test and indoor permeability test,the environmental stress and water pressure state of rock mass are considered as the main factors influencing the permeability coefficient.The test results indicate that the permeability coefficients in high water pressure are obviously greater than ones in low water pressure state.It is also pointed out that the permeability coefficients in indoor test are greater than ones obtained from in situ test.
Combined with high pressure permeability test,conventional pressure permeability test and indoor permeability test for fractured rock mass of high pressure water tunnel in one water-pumped storage power project,the variation law of rock mass permeability under high water pressure is analyzed to describe the relation between discharge and water pressure.Through the calculation of permeability coefficient of fractured rock mass,relation between water pressure and permeability coefficient is also discussed.By comparing the results of high pressure permeability test,conventional pressure permeability test and indoor permeability test,the environmental stress and water pressure state of rock mass are considered as the main factors influencing the permeability coefficient.The test results indicate that the permeability coefficients in high water pressure are obviously greater than ones in low water pressure state.It is also pointed out that the permeability coefficients in indoor test are greater than ones obtained from in situ test.
引文
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[9]殷黎明,杨春和,罗超文,等.高压压水试验在深钻孔中的应用[J].岩土力学,2005,26(10):1692-1694.YIN Li-ming,YANG Chun-he,LUO Chao-wen,et al.Application of high water-pressure test to deep borehole[J].Rock and Soil Mechanics,2005,26(10):1692-1694.
[2]GANG H,MAURICE B,DUSSEAULT.Description of fluid flow around a wellbore with stress-dependent porosity and permeability[J].Journal of Petroleum Science and Engineering,2003,(40):1-16.
[3]殷黎明,杨春和,王贵宾,等.地应力对裂隙岩体渗流特性影响的研究[J].岩石力学与工程学报,2005,24(17):3071-3075.YIN Li-ming,YANG Chun-he,WANG Gui-bin,et al.Study on effect of geostress on permeability of fractured rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(17):3071-3075.
[4]郭启良,安其美,丁立丰.高水头电站钻孔高压压水的作用和意义[C]//地壳构造与地壳应力文集13.北京:地震出版社,2000:148-154.
[5]中华人民共和国行业标准编写组.SL31-2003水利水电工程钻孔压水试验规程[S].北京:水利电力出版社,2003.
[6]郭启良,王海忠,张志国.小天都水电站气垫调压室洞壁围岩的高压透水性测量研究[J].水力发电学报,2005,24(1):102-106.GUO Qi-liang,WANG Hai-zhong,ZHANG Zhi-guo.Study of permeability character under high water pressure in the surrounding rock of the air-cushion surge tank in Xiaotiandu hydropower station[J].Journal of Hydroelectric Engineering,2005,24(1):102-106.
[7]张世殊.溪洛渡水电站坝基岩体钻孔常规压水与高压压水试验成果比较[J].岩石力学与工程学报,2002,2l(3):385-387.ZHANG Shi-shu.Comparison of results of conventional and high water-pressure tests on the dam foundation rock masses of Xiluodu hydroelectric station[J].Chinese Journal of Rock Mechanics and Engineering,2002,2l(3):385-387.
[8]傅胜,李尚高.黑麋峰抽水蓄能电站高压岔管段断层处理专题研究报告[R].长沙:中国水电顾问集团中南勘测设计研究院,2007.
[9]殷黎明,杨春和,罗超文,等.高压压水试验在深钻孔中的应用[J].岩土力学,2005,26(10):1692-1694.YIN Li-ming,YANG Chun-he,LUO Chao-wen,et al.Application of high water-pressure test to deep borehole[J].Rock and Soil Mechanics,2005,26(10):1692-1694.
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