上海地区多含水层系统深部承压层降水诱发地层响应规律

doi:10.16183/j.cnki.jsjtu.2021.386

上海交通大学学报 ›› 2023, Vol. 57 ›› Issue (2): 138-147.doi: 10.16183/j.cnki.jsjtu.2021.386

所属专题：《上海交通大学学报》2023年“船舶海洋与建筑工程”专题

上海地区多含水层系统深部承压层降水诱发地层响应规律

彭晨鑫¹, 李明广¹^,²(), 甄亮³, 李耀良², 张哲彬²

1.上海交通大学土木工程系; 上海市公共建筑和基础设施数字化运维重点实验室, 上海 200240
2.上海市基础工程集团有限公司,上海 200002
3.上海公路桥梁(集团)有限公司,上海 200433

收稿日期:2021-09-28 修回日期:2021-12-01 接受日期:2021-12-08 出版日期:2023-02-28 发布日期:2023-03-01
通讯作者: 李明广 E-mail:lmg20066028@sjtu.edu.cn.
作者简介:彭晨鑫(1996-),硕士,从事基坑工程方面的研究.
基金资助:
国家自然科学基金面上项目(41977216);上海市青年科技启明星计划(19QB1401800)

Strata Responses Due to Pumping from Deep Confined Aquifers of Multi-Aquifer-Aquitard System in Shanghai

PENG Chenxin¹, LI Mingguang¹^,²(), ZHEN Liang³, LI Yaoliang², ZHANG Zhebin²

1. Department of Civil Engineering; Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University, Shanghai 200240, China
2. Shanghai Foundation Engineering Group Co., Ltd., Shanghai 200002, China
3. Shanghai Road and Bridge (Group) Co., Ltd., Shanghai 200433, China

Received:2021-09-28 Revised:2021-12-01 Accepted:2021-12-08 Online:2023-02-28 Published:2023-03-01
Contact: LI Mingguang E-mail:lmg20066028@sjtu.edu.cn.

摘要/Abstract

摘要：

软土地区多含水层系统承压层抽水存在越流现象,地下水渗流和区域地层变形响应规律复杂.基于某超深地下工程承压水抽水试验,采用数值方法研究软土地区多含水层系统第二、第三承压层降水的地质环境响应.建立了三维有限差分模型,考虑流固耦合效应和土体小应变刚度特性,模拟了不同埋深承压含水层抽水试验,对比分析各承压层抽水引起的承压水头降深和深层土体变形时空分布特性.结果表明,第二承压层水位降深较小,但引起的地表沉降更大;第二和第三承压层抽水引起降水层的压缩变形分别占地表沉降的56.18%和77.69%.主要原因为浅部土层压缩性高,相同降深条件下引起的土层竖向压缩量更大;且第二承压层与上部弱透水层的水力联系较强,越流作用明显,导致抽水引起的地下水水位降深在深度方向的影响范围更大.研究成果对后续超深基坑降水施工及环境变形控制具有重要的参考价值.

关键词: 深层承压水, 抽水试验, 地下水渗流, 地层变形, 时空分布

Abstract:

When pumping in confined aquifers, vertical leakage could be found in the multi-aquifer system in soft deposits, and the responses of groundwater flow and strata deformation are complicated. Based on pumping tests in an ultra-deep underground project, this study performs a 3D finite-difference modeling to investigate the responses of groundwater and strata to pumping in the second and third confined aquifers. It considers the hydro-mechanical coupled and small strain stiffness characteristics of soils in the analysis, and discusses and compares the spatiotemporal distribution characteristics of drawdown and deformation induced by pumping in different confined aquifers. The results indicate that the ground settlement induced by pumping in the second confined aquifer is greater though the groundwater drawdown is smaller, and the compression of dewatering aquifers caused by dewatering in the second and third aquifers accounts for 56.18% and 77.69% of the settlement, respectively. It could be attributed to the connectivity between the second confined aquifer and its overlying aquitards, which results in a greater influential depth. In addition, the compressibility of shallow strata is significantly greater than that of deep strata. The study is significant for the dewatering construction and environmental deformation control of ultra-deep excavations.

Key words: deep artesian water, pumping tests, groundwater flow, strata deformation, spatiotemporal distribution

中图分类号:

TU42

彭晨鑫, 李明广, 甄亮, 李耀良, 张哲彬. 上海地区多含水层系统深部承压层降水诱发地层响应规律[J]. 上海交通大学学报, 2023, 57(2): 138-147.

PENG Chenxin, LI Mingguang, ZHEN Liang, LI Yaoliang, ZHANG Zhebin. Strata Responses Due to Pumping from Deep Confined Aquifers of Multi-Aquifer-Aquitard System in Shanghai[J]. Journal of Shanghai Jiao Tong University, 2023, 57(2): 138-147.

图/表 13

图1

图2

图3

表1

图4

表2

土层参数取值

土层编号		γ/ (kN·m^-3)	c'/ kPa	φ'/ (°)	ψ/ (°)	e	$E 50 r e f$ / MPa	$E o e d r e f$ / MPa	$E u r r e f$ / MPa	$G 0 r e f$ /MPa	γ_0.7	k_h/ (cm·s^-1)	k_v/ (cm·s^-1)
Aq0	②₁	18.5	6	26.5	0	0.93	5.31	4.43	31.00	124.0	2.7×10^-4	1.19×10^-6	7.76×10^-7
	③	17.5	2	29.6	0	1.18	3.61	3.01	21.04	84.2	2.7×10^-4	1.04×10^-6	6.78×10^-7
AdI	④	17.0	3	27.9	0	1.34	2.90	2.41	16.88	67.5	2.7×10^-4	1.94×10^-7	1.41×10^-7
	⑤₁	17.6	4	30.5	0	1.13	4.05	3.38	23.623	94.5	2.7×10^-4	3.77×10^-7	3.12×10^-7
	⑤₃	17.9	5	31.6	0	1.01	5.55	4.62	32.38	129.5	2.7×10^-4	2.42×10^-6	1.47×10^-6
AdII	⑧₁	18.0	8	32.4	0	1.01	5.70	4.75	33.26	133.1	2.7×10^-4	1.15×10^-6	7.32×10^-7
	⑧₂	18.7	8	33.1	0	0.85	6.75	5.63	39.38	157.5	2.7×10^-4	3.72×10^-6	2.31×10^-6
AqII	⑨₁	19.6	0	31.5	1.5	0.66	14.66	14.66	58.64	293.2	2.7×10^-4	3.01×10^-4	2.03×10^-4
	⑨_2-1	20.4	0	37.5	7.5	0.53	15.69	15.69	62.76	313.8	2.7×10^-4	1.00×10^-4	9.61×10^-5
	⑨_2-2	20.4	0	36.5	6.5	0.52	17.21	17.21	68.84	344.2	2.7×10^-4	4.98×10^-4	2.04×10^-4
AdIII	⑩	20.0	19	31.6	0	0.64	12.51	10.42	72.95	291.8	2.7×10^-4	2.05×10^-7	8.59×10^-8
	⑩_夹	19.5	0	32.0	0	0.71	9.25	7.70	53.93	215.7	2.7×10^-4	2.31×10^-5	3.47×10^-6
	⑩_A	19.5	0	37.0	7.0	0.69	12.37	12.37	49.48	247.4	2.7×10^-4	3.47×10^-4	7.98×10^-5
AqIII	11	19.5	0	36.0	6.0	0.69	15.40	15.40	61.60	308.0	2.7×10^-4	8.45×10^-4	1.74×10^-4
	11_T	19.2	0	36.0	0	0.76	10.78	8.98	62.87	251.5	2.7×10^-4	8.43×10^-6	4.68×10^-6
AdIV	12	20.1	15	30.0	0	0.62	12.20	10.17	71.19	284.8	2.7×10^-4	2.01×10^-7	1.18×10^-7

表2

图5

图6

图7

图8

图9

图10

图11

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序号	时间	试验内容	抽水井号	平均流量/(m³·h^-1)
1	2017-10-23T10:30—2017-10-29T19:00	初始水位观测	-	-
2	2017-12-7T12:20—2017-12-8T12:20	11层单井抽水	K11-1	75.30
3	2017-12-10T13:30—2017-12-12T16:30	⑨层单井抽水	K9-2	456.00
4	2017-12-20T12:00—2017-12-27T12:00	11层群井抽水	K11-1、K11-2	74.36、132.56
5	2018-1-2T 15: 00—2018-1-9T 16:00	⑨层群井抽水	K9-1、K9-2	146.70、452.20

上海地区多含水层系统深部承压层降水诱发地层响应规律

Strata Responses Due to Pumping from Deep Confined Aquifers of Multi-Aquifer-Aquitard System in Shanghai

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