Feasibility analysis of dewatering recharge for deep foundation pit in pebble stratum
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摘要: 为客观评价卵石地层深基坑降水回灌的可行性，分析梳理了影响可回灌性的关键因素，划分了可回灌性等级，确定了对应的评价指标水平，基于Euclid贴近度–灰色关联度分析，提出了可回灌性多因素、多水平综合评价模型。通过分析深基坑工程参数与可回灌性评价指标的关联度，可确定深基坑工程降水的可回灌性等级。以回灌工程实例对可回灌性分析的可靠性进行了验证，结果表明，基于Euclid贴近度–灰色关联度的可回灌性分析方法可为回灌设计提供参考。
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关键词:
- 卵石地层 /
- 深基坑降水 /
- 可回灌性 /
- Euclid贴近度–灰色关联度分析
Abstract: To objectively evaluate the feasibility of dewatering recharge in deep foundation pit in pebble stratum, the key factors affecting the feasibility of recharge were analyzed, the classification of the feasibility of recharge and the corresponding evaluation index levels were determined. Based on Euclid approach degree and grey correlation degree analysis, a multi-factor and multi-level comprehensive evaluation model for recharging feasibility was proposed. By analyzing the correlation degree between the parameters of deep foundation pit engineering and the evaluation index of recharge feasibility, the feasibility grade of dewatering recharge of deep foundation pit engineering can be determined. The reliability of the recharge feasibility analysis was verified by a case study of the recharge project, and the results show that the method of the recharge feasibility analysis based on Euclid approach degree and grey correlation degree can provide references for recharge design. -
表 3 卵石层水文地质条件的影响
卵石层
水文地质条件可回灌性分级 强 较强 中 较弱 弱 渗透系数k/(m·d−1) >350 250～350 150～250 50～150 <50 可灌厚度h/m >15 10～15 5～10 3～5 <3 埋深H/m <10 10～20 20～30 30～50 >50 
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表 5 可回灌性评价指标
评价指标 可回灌性分级 强 较强 中 较弱 弱 回灌区与降水区面积比a >0.8 0.5～0.8 0.3～0.5 0.1～0.3 <0.1 回灌区至降水区距离l/m >1000 800～1000 500～800 300～500 <300 目标层渗透系数k/（m·d−1） >350 250～350 150～250 50～150 <50 目标层可灌厚度h/m >20 15～20 10～15 5～10 <5 目标层埋深H/m <10 10～20 20～30 30～50 >50 周边建构筑物距离s/m >1000 500～1000 300～500 100～300 <100
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表 6 回灌工程参数表
回灌区与降水区面积比a 回灌区至降水区距离l/m 目标层渗透系数k/(m·d−1) 目标层可灌厚度h/m 目标层埋深H/m 周边建构筑物距离s/m 0.105 255 432 6 10 1200
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表 7 可回灌性评价参数表
评价指标 比较数列$ {y}_{i}\left(k\right) $ 参考数列
$ x\left(k\right) $$ i=1 $强 $ i=2 $较强 $ i=3 $中 $ i=4 $较弱 $ i=5 $弱 回灌区与降水区面积比a >0.8 0.5～0.8 0.3～0.5 0.1～0.3 <0.1 0.105 回灌区至降水区距离l/m >1000 800～1000 500～800 300～500 <300 255 目标层渗透系数k/(m·d−1) >350 250～350 150～250 50～150 <50 432 目标层可灌厚度h/m >20 15～20 10～15 5～10 <5 6 目标层埋深H/m <10 10～20 20～30 30～50 >50 10 周边建构筑物距离s/m >1000 500～1000 300～500 100～300 <100 1200
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表 8 数据处理结果
评价指标 比较数列$ {y}_{i}\left(k\right) $ 参考数列
$ x\left(k\right) $$ i=1 $强 $ i=2 $较强 $ i=3 $中 $ i=4 $较弱 $ i=5 $弱 回灌区与降水区面积比a 1 0.8125 0.5 0.25 0.125 0.1313 回灌区至降水区距离l/m 1 0.9 0.65 0.4 0.3 0.2550 目标层渗透系数k/(m·d−1) 0.8102 0.6945 0.463 0.2315 0.1157 1.0000 目标层可灌厚度h/m 1 0.875 0.625 0.375 0.25 0.3000 目标层埋深H/m −0.2 −0.3 −0.5 −0.8 −1 −0.2000 周边建构筑物距离s/m 0.8333 0.65 0.3334 0.1667 0.0833 1.0000
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