缓倾斜地层倾角对钻孔疏放水影响的数值模拟
Numerical simulation of the effect of dip angle of gently inclined strata on dredging water in boreholes
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摘要: 针对缓倾斜地层中地层倾角对钻孔疏放水的影响，通过建立缓倾斜地层与仰斜钻孔组合地下水数值模型，在设定倾斜钻孔为定流量井边界与定水头井边界排水条件下，模拟分析含水层水位、排水量动态。结果表明：高水压富水含水层疏放初期，当含水层能够排出水量受钻孔排水能力限制保持定流量排水时，倾角较大的含水层水压不易疏降；一般情况含水层经短期疏放，在钻孔位置水压降至其位置高程而保持定水头井排水时，倾角较大的含水层排水量更大，含水层水压疏放更显著；当地层倾角达到25°时，地层倾角对钻孔疏放水的影响明显化。Abstract: In order to analyze the influence of the dip angle of the formation on the dredging water from the borehole in the gently inclined strata, a numerical model of groundwater in the combination of gently inclined strata and upward-sloping borehole is established, and the water level and drainage dynamics of the aquifer are simulated under the conditions of setting the inclined borehole as constant-flow and constant-head well boundary. The results show that: in the early stage of the drainage of high-water pressure water-rich aquifer, the water pressure of the aquifer with large dip angle is not easy to drain down when the water discharged from the aquifer is restricted by the drainage capacity of the borehole and kept at a constant flow; in general, aquifers are discharged for a short period of time. When the water pressure at the drilling position drops to its position elevation and the constant head well is kept for drainage, aquifers with larger dip angle have larger water displacement and more significant water pressure relief. When the dip of the formation reaches 25°, the influence of the dip of the formation on the dredging water of the borehole is obvious.
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