利用压力脉冲试验测定某地花岗岩体的渗透系数
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摘要
利用压力脉冲试验进行渗透系数测量,采用跨接式封隔器系统将试验段与钻孔分隔,通过高压泵向试验段注水,使试验段压力迅速增加,然后关泵,并记录压力随时间的衰减曲线。通过将记录曲线与标准曲线进行拟合的方法确定测段岩体的渗透系数。给出了在一个钻孔中利用该试验方法获得的3个测段的渗透系数测试结果。并与同一钻孔中的常规压水试验结果以及其他地区渗透系数测试数据的统计分析资料进行了对比。作为岩体渗透系数测试的一种试验方法,压力脉冲试验方法具有方便、省时的优点,尤其适用于低渗透系数岩体的测试。
When doing permeability test by using pressure pulse test method, the straddle packer system is adopted to isolate the test interval with the other parts of borehole; and then increase the pressure of test interval by high-pressure pump rapidly. The system is then shut-in and the pressure decay curve is recorded. By fitting the recorded data with the type curve, the permeability of test rock mass could be determined. Permeability test results of three intervals of one borehole in use of pressure pulse test method at granite mass in Gansu Province are presented. The test results are compared with Lugeon test results in the same borehole and statistical analysis of permeability test results in other areas. As one method of rock mass permeability test, pressure pulse test has superiority to other methods for its convenience and shorter time consuming, and is suitable for low permeability rock mass test especially.
When doing permeability test by using pressure pulse test method, the straddle packer system is adopted to isolate the test interval with the other parts of borehole; and then increase the pressure of test interval by high-pressure pump rapidly. The system is then shut-in and the pressure decay curve is recorded. By fitting the recorded data with the type curve, the permeability of test rock mass could be determined. Permeability test results of three intervals of one borehole in use of pressure pulse test method at granite mass in Gansu Province are presented. The test results are compared with Lugeon test results in the same borehole and statistical analysis of permeability test results in other areas. As one method of rock mass permeability test, pressure pulse test has superiority to other methods for its convenience and shorter time consuming, and is suitable for low permeability rock mass test especially.
引文
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[2]Hayashi K,Ito T,AbéH.A new method for the determination of in situ hydraulic properties by pressure pulse tests and application to the Higashi Hachimantai Geothermal Field[J].Journal of Geophysical Research,1987,92(9):9 168-9 174.
[3]John D Bredehoeft,Stavros S Papadopulos.A method for determining the hydraulic properties of tight formations[J].Water Resources Research,1980,16(1):233-238.
[4]Hilton H Cooper,John J R,Bredehoeft D,et al.Response of finite-diameter well to an instantaneous charge of water[J].Water Resources Research,1967,3(1):263-269.
[5]阮小平,李方全.三峡坝区水库诱发地震研究[M].北京:地震出版社,1993.50-61.
[6]SL 25-92,水利水电工程钻孔压水试验规程[S].
[7]张伯崇.地壳岩石的渗透性状[J].世界地震译丛,1987,(2):1-10.
[2]Hayashi K,Ito T,AbéH.A new method for the determination of in situ hydraulic properties by pressure pulse tests and application to the Higashi Hachimantai Geothermal Field[J].Journal of Geophysical Research,1987,92(9):9 168-9 174.
[3]John D Bredehoeft,Stavros S Papadopulos.A method for determining the hydraulic properties of tight formations[J].Water Resources Research,1980,16(1):233-238.
[4]Hilton H Cooper,John J R,Bredehoeft D,et al.Response of finite-diameter well to an instantaneous charge of water[J].Water Resources Research,1967,3(1):263-269.
[5]阮小平,李方全.三峡坝区水库诱发地震研究[M].北京:地震出版社,1993.50-61.
[6]SL 25-92,水利水电工程钻孔压水试验规程[S].
[7]张伯崇.地壳岩石的渗透性状[J].世界地震译丛,1987,(2):1-10.
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