基于改进阻力系数法的悬挂式帷幕基坑渗流计算

彭祎; 成建梅; 马郧; 陈凝旖

doi:10.19509/j.cnki.dzkq.2021.0411

基于改进阻力系数法的悬挂式帷幕基坑渗流计算

doi: 10.19509/j.cnki.dzkq.2021.0411

彭祎^1,,
成建梅^1, ,,
马郧²,
陈凝旖¹

基金项目:

武汉市城建委科技计划项目 201546

国家自然科学基金项目 U1911205

详细信息

作者简介:
彭祎(1996-), 男, 现正攻读水文地质专业硕士学位, 主要从事水文地质方面的研究工作。E-mail: pengyi@cug.edu.cn

通讯作者:
成建梅(1971-), 女, 教授, 主要从事地下水流-污染数值模拟方面的研究工作。E-mail: jmcheng@cug.edu.cn

中图分类号: P641
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出版历程
- 收稿日期: 2020-11-20

Seepage calculation of foundation with suspended curtain based on improved resistance coefficient method

Peng Yi^1
,,
Cheng Jianmei^{1
, ,},
Ma Yun²,
Chen Ningyi¹

摘要

摘要: 帷幕结合基坑内降水的方案是深基坑工程中地下水控制的主要趋势，由于基坑渗流场的复杂性和尺度效应，业内尚无成熟且精确的解析计算方法。在分析悬挂式帷幕基坑与闸坝渗流场特点异同的基础上，对闸坝改进阻力系数法进行修正，提出了承压水条件下悬挂式帷幕基坑渗流段的分段方式，推导了新的考虑基坑特殊段"水平汇流段"的等效阻力系数计算公式，并将之拓展至含水层各向异性条件下，实现了悬挂式帷幕基坑涌水量和坑外水位降深的定量计算；最后，结合典型基坑案例，通过数值模拟验证了该方法的精确性。研究表明：经过合理分段、等效和修正处理后，改进阻力系数法在悬挂式帷幕基坑承压水渗流计算中，与数值法计算结果的相对误差能控制在5%以内，精度较高，且具有分段灵活、计算简单的优点，能适用于不同场地条件下基坑降水设计的计算。
- 深基坑工程 /
- 改进阻力系数法 /
- 地下水控制 /
- 悬挂式帷幕 /
- 基坑涌水量 /
- 降深
Abstract: The combination of the curtain and pit dewatering is the main trend of groundwater control in the deep foundation pit project.Due to the complexity and scale effect of the seepage field around the deep foundation pit, there is still no mature and accurate analytical calculation method for dewatering design.Based on the comparison of the characteristics of the seepage field between the suspended curtain and the gate dam, a new subsection mode of seepage section of suspended curtain foundation pit under confined aquifer is proposed.Modified from the improved resistance coefficient method of the gate dam, a new formula for calculating equivalent resistance coefficient of "horizontal confluence section"within special zone of foundation pit is derived, which is extended to the anisotropic condition of aquifer and can be used in the quantitative calculation of the water outflow and drawdown in the suspended curtain foundation pit.Finally, the accuracy of the method is verified by numerical simulation combined with a typical foundation pit case.The studies show that, after reasonable segmentation, equivalence and correction, the relative error between the improved resistance coefficient method and the numerical modeling can be controlled within 5%, with high accuracy.Besides, it has the advantages of flexible segmentation and simple calculation, and can be applied to the calculation of foundation pit dewatering design under different site conditions.
- deep foundation pit engineering /
- improved resistance coefficient method /
- groundwater control /
- suspended curtain /
- foundation water outflow /
- drawdown

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图 1 剖面基本段形式

Figure 1. Basic segment form of profile

下载: 全尺寸图片幻灯片

图 2 基坑含水层分段

H₀.初始水头(m)；R.影响半径(m)；r₀.基坑等效半径(m)；M.总含水层厚度(m)；d.帷幕进入含水层深度(m)；w.帷幕厚度(m)；M′.减去基坑部分的含水层厚度(m)；d′.减去基坑部分的帷幕深度(m)。当基坑底部未进入含水层时，M′=M，d′=d，第④段与第②段阻力系数相同

Figure 2. Segmentation of pit aquifer of the foundation

下载: 全尺寸图片幻灯片

图 3 基坑水平汇流段与闸坝水平段平面流网示意图

Figure 3. Schematic diagram of horizontal confluence section and horizontal section plane flow net

下载: 全尺寸图片幻灯片

图 4 基坑场地条件示意图(单位：m)

S.坑内目标降深；HD.基坑安全水位

Figure 4. Schematic diagram of pit conditions of the foundation

下载: 全尺寸图片幻灯片

图 5 基坑降水数值模型(单位：m)

Figure 5. Numerical model of pit dewatering of the foundation

下载: 全尺寸图片幻灯片

图 6 不同基坑贯入度下坑内外水位降深比-帷幕贯入度曲线

Figure 6. Curtain penetration curve between inside and outside water level drawdown ratio at different foundation pit penetration

下载: 全尺寸图片幻灯片

图 7 不同基坑半径下坑内外水位降深比-帷幕贯入度曲线

Figure 7. Curtain penetration curve between inner and outer water drawdown ratio of different foundation pit radius

下载: 全尺寸图片幻灯片

图 8 深基坑各向同性、各向异性含水层流网图

Figure 8. Flow network diagram of isotropic and anisotropic aquifer in deep foundation pit

下载: 全尺寸图片幻灯片

图 9 不同各向异性程度下坑内外水位降深比-帷幕贯入度曲线

Figure 9. Curtain penetration curve between inner and outer water drawdown ratiounder different degrees of anisotropy

下载: 全尺寸图片幻灯片

表 1 改进阻力系数法与数值法涌水量结果分析

Table 1. Analysis of the results of improved resistance coefficient method and numerical method of water outflow

帷幕贯入度	阻力系数法涌水量/(m³·d^-1)	数值法水头/m	数值法涌水量/(m³·d^-1)	阻力系数法与数值法的相对误差/%
0.2	28 870	10.72	29 256	-1.32
0.3	27 592	10.80	27 758	-0.60
0.4	26 298	10.86	26 293	0.02
0.5	24 938	10.93	24 769	0.68
0.6	23 451	11.08	22 992	2.00
0.7	21 746	11.10	21 276	2.21
0.8	19 648	11.18	19 083	2.97
0.9	16 666	11.23	16 112	3.44
0.95	14 194	11.20	13 765	3.11

下载: 导出CSV

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