| 蒋中明,陈胜宏,冯树荣,张新敏.高压条件下岩体渗透系数取值方法研究[J].水利学报,2010,41(10): |
| 高压条件下岩体渗透系数取值方法研究 |
| Study on the method for evaluating rock mass permeability coefficient |
| |
| DOI： |
| 中文关键词: 裂隙岩体 高压压水试验 非达西流 岩体渗透系数 |
| 英文关键词: fractured rock mass high pressure permeability test non-Darcy’ s flow rock mass permeabili?
ty coefficient |
| 基金项目: |
|
| 摘要点击次数: 1847 |
| 全文下载次数: 264 |
| 中文摘要: |
| 裂隙岩体在高水压条件下的渗透性可以通过高压压水试验获得。高水压状态下裂隙岩体中水流形态及渗流本构律对岩体渗透系数起决定性的影响。针对高水压状态下岩体中渗流形态为紊流和非达西流的实际情况，以高压压水试验中压水孔内的水压力和流量以及渗压孔内的孔隙压力等参量为基础，推导了单孔三段压水法和单孔单段压水法的裂隙岩体渗透系数计算公式。结合某抽水蓄能电站高压压水试验成果深入分析了不同渗流形态下的岩体渗透系数的差异性。研究成果表明，裂隙岩体水流形态对岩体渗透系数定量取值结果影响较大，同时高水压条件下水力劈裂产生也将导致裂隙岩体渗透系数取值的急剧增加。 |
| 英文摘要: |
| Permeability coefficient of fractured rock mass under high pore pressure condition could be ob?tained through high pressure permeability test （HPPT） . The constitutive law and flow pattern of water flow in rock mass under high water pressure are the main factors for determinating permeability coefficient.Based on the fact that water flow in rock mass under high pressure condition belongs to turbulent flow and the Darcy’ s law is not available anymore，the formulas for calculating the high pressure permeability coefficient at different experiment methods are deduced according to the pressure and discharge in the water injection borehole and pore water pressure in the monitor borehole. The difference of permeability coefficient at different flow pattern is discussed based on the experimental results of the Heimifeng Water-Pumped Storage Power Project. It indicates that permeability coefficient of turbulent flow in fractured rock mass is far more than that of laminar flow and the hydraulic fracture will lead to the sharp increase of permeability co?
efficient under high pressure condition. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |