| 陈江峰.承压水导升过程中微裂隙扩张分析[J].地质与勘探,2017,53(1):157-163 |
| 承压水导升过程中微裂隙扩张分析 |
| Analysis of micro-crack expansion during confined water rise |
| 投稿时间：2016-06-18 修订日期：2016-10-16 |
| DOI：10.12134/j.dzykt.2017.01.016 |
| 中文关键词: 带压开采 裂隙扩展 承压水 导升高度 |
| 英文关键词: mining above aquifer, expansion of crack, confined water, moving height |
| 基金项目:国家自然科学基金委员会与神华集团有限责任公司联合资助项目（U1261207）；河南省国土资源重大改革创新问题研究项目（2014YGT09）资助 |
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| 中文摘要: |
| 带压开采是一种常用且有效的承压水上采煤方法，准确评价承压水导升高度是实现承压水上安全采煤的关键因素之一。将隔水层视为各向同性连续体，在隔水层微裂隙存在的前提下，运用力学理论推导了微裂隙的扩展长度与岩体力学参数、微裂隙参数以及水压之间的关系，并在此基础上建立了承压水导升高度的计算式。结果表明，承压水导升高度的微裂隙扩展长度L随侧压系数λ、隔水层内摩擦角φ、隔水层固有抗剪强度S0、微裂隙中水流速度v及垂直应力σV的增加而减小；随夹角α和承压含水层水压P0的增加而增加；而微裂隙宽度d对承压水导升高度几乎没有影响。 |
| 英文摘要: |
| Mining above the aquifer is one of common and effective methods to exploit the coal seam threatened by water-inrush from floor, which is a key factor for safe mining under confined water that evaluates the height of confined water rise accurately. The aquifer of the floor is regarded as an isotropic and continuous body. Under the precondition of existence of micro-cracks in aquifer, the theory of mechanics is applied to deduce the relationship between the extension length of micro-cracks and the mechanical parameters of rock mass, the relationship between parameters of micro-cracks, the relationship between the parameters of confined water, and the environment of micro-cracks in the aquifer. Based on these relations, we establish the calculation formula of the moving height of the confined water. It is concluded that the micro-crack expansion length “L” of the confined water rise declines with the increase of several parameters, including the side pressure coefficient “λ”，the internal friction angle “φ” of aquifer, the inherent shear strength “S0” of aquifer, the water flow velocity “v” in the micro-crack and the vertical stress “σV”. Whereas it increases as the angle “α” and the confined aquifer pressure “P0” become larger. However, the micro-crack width “d” has little impact on the confined water rise. |
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