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基于Darcy -Gersevanov广义渗流关系式 ,本文首先导出了单井定流量抽水引起的泰斯承压含水层水平运动和应变解析表达式 ,并据此提出了抽水诱发地裂缝活动的含水层水平应变新机理 ,其主要观点为 :受井栅的约束阻挡作用 ,抽水活动将在含水层内部形成近井径向挤压区和远井径向拉张区两个应变区域 ,随着抽水时间的增长 ,近井径向挤压区将逐渐向外扩展 ;当地裂缝及其下伏断层或裂隙位于抽水活动引起的径向拉张应变区域时 ,地裂缝将出现加速活动 ;反之 ,当地裂缝处于抽水活动引起的径向挤压应变区域时 ,地裂缝活动反而受到抑制。上述地裂缝活动机理通过大同机车工厂现场抽水实验得到了初步证实。
Based on the Darcy-Gersevanov generalized seepage relationship, this paper first derives the analytical expression of horizontal movement and strain of Teth’s confined aquifer caused by single-well constant-flow pumping, and proposes a new horizontal strain of aquifer induced by groundwater pumping Mechanism, its main point of view is: constrained by the well grid barrier action, the pumping activities will be formed within the aquifer proximal radial crush zone and far zone radial stretch zone two strain areas, with the pumping time, The near-well radial extrusion zone will gradually expand outward; when the local fractures and their underlying faults or fractures are located in the radial tensile strain zone caused by pumping activities, the earth fractures will accelerate; otherwise, the local fractures are caused by pumping activities Of the radial crushing strain zone, the activity of ground fissures is instead suppressed. The ground fissure activity mechanism through Datong locomotive factory pumping experiments have been initially confirmed.