某落底式止水帷幕基坑的群井连通试验研究

陈律; 危正平; 胡磊; 程凯; 汪紫璇

doi:10.20265/j.cnki.issn.1007-2993.2025-0118

某落底式止水帷幕基坑的群井连通试验研究

doi: 10.20265/j.cnki.issn.1007-2993.2025-0118

1.
中机三勘岩土工程有限公司，湖北武汉　430000
2.
正宇科创（武汉）岩土工程有限公司，湖北武汉　430000
3.
南京南大岩土工程技术有限公司湖北分公司，湖北武汉　430000

基金项目: 武汉市2023年度市城建局科技项目（202361）；湖北省建设科技计划项目（2023117）

详细信息

作者简介:
陈　律，男，1987年生，硕士，高级工程师，主要从事岩土工程勘察、设计、咨询等工作。E-mail：277679311@qq.com

中图分类号: TU473
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- 文章访问数: 44
- HTML全文浏览量: 17
- PDF下载量: 9
- 被引次数: 0
出版历程
- 收稿日期: 2025-03-17
- 修回日期: 2025-05-12
- 录用日期: 2025-06-26
- 网络出版日期: 2026-06-08
- 刊出日期: 2026-06-08

Experimental study on well group connectivity test of a foundation pit with aquifer-penetrating cut-off wall

1.
China Machinery TIDI Geotechnical Engineering Co., Ltd., Wuhan 430000, Hubei, China
2.
Zhengyu Kechuang (Wuhan) Geotechnical Engineering Co., Ltd., Wuhan 430000, Hubei, China
3.
Nanjing Nanda Geotechnical Engineering Technology Co., Ltd. Hubei Branch, Wuhan 430000, Hubei, China

摘要

摘要: 高承压水地区的深基坑工程通常采用落底式止水帷幕隔渗，以减小降水对周边环境的影响。然而目前关于落底式帷幕止水效果的评价方法尚不完善。武汉某深基坑工程地下水控制采用CSM落底式止水帷幕+坑内疏干方案，为预判基坑出水量并评价帷幕止水效果，开展了群井多降深抽水试验，通过获取坑内外的水位降深数据以及出水量等信息，在土方开挖前预判了基坑后期的出水量，经初步判断，CSM落底式帷幕止水效果良好。该方法可为落底式止水帷幕评价提供借鉴。
- CSM /
- 落底式止水帷幕 /
- 群井连通试验 /
- 多降深抽水试验 /
- 出水量
Abstract: Cut-off walls penetrating the aquifer are commonly adopted for seepage isolation in deep foundation pit projects in high artesian water areas, so as to reduce the impact of dewatering on the surrounding environment. However, the current evaluation methods for the seepage control effect of cut-off walls penetrating the aquifer remain inadequate. For a deep foundation pit project in Wuhan, the groundwater control scheme combines the CSM cut-off wall penetrating the aquifer with internal well dewatering. To predict the water inflow of the foundation pit and evaluate the seepage control effect of the cut-off wall, a multi-level pumping test with a well group was carried out. By obtaining the data of water level drawdown inside and outside the foundation pit as well as the water inflow information, the subsequent water inflow of the foundation pit was predicted prior to earth excavation. Preliminary judgment shows that the CSM cut-off wall penetrating the aquifer achieves a favorable seepage control effect. This method can provide a reference for the evaluation of cut-off walls penetrating the aquifer.
- CSM /
- aquifer-penetrating cut-off wall /
- well group connectivity test /
- multi-level pumping test /
- water inflow

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图 1 项目周边环境示意图

Figure 1. Schematic diagram of the surrounding environment of the project

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图 2 基坑支护典型剖面图

Figure 2. Typical section of excavation support

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图 3 数字水位计工作原理图

Figure 3. Working principle of digital water level gauge

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图 4 单声道V字形布设流量计示意图

Figure 4. Schematic diagram of flowmeter with monophonic V-shaped layout

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图 5 连通试验井位平面布置图

Figure 5. Layout plan of wells for connectivity test

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图 6 试验全过程观测井水位-时间曲线图

Figure 6. Water level-time curve of observation wells during full test process

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图 7 基坑每半小时总出水量折线图

Figure 7. Line chart of total water discharge from foundation pit per half hour

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表 1 岩土层参数表

Table 1. Geotechnical parameter

地层编号	岩土名称	层厚 /m	黏聚力c /kPa	内摩擦角φ /（°）
(1-1）	杂填土	0.3～3.1	8	15
（1-2）	素填土	0.6～3.9	8	6
（2-1）	黏土	0.8～3.0	24	13
（2-2）	黏土	0.7～2.7	19	11
（2-3）	淤泥质粉质黏土	2.7～6.9	12	5
（2-4）	淤泥质粉质黏土夹粉土	1.0～6.3	15	6
（3）	粉砂夹粉土、粉质黏土	1.0～4.8	14	8
（4-1）	粉砂	2.0～13.4	0	32
（4-2）	粉细砂	4.6～16.5	0	34
（4-2a）	粉砂夹粉土	0.5～2.0	12	9
（4-3）	细砂	6.6～17.5	0	35
（4-3a）	粉砂夹粉土	0.5～6.0
（4-4）	中粗砂混卵、砾石	0.3～3.0
（5-1）	强风化粉砂质泥岩	0.5～5.8	45	18
（5-2）	中等风化粉砂质泥岩	8.0～21.0	67	25
（5-2s）	中等风化软弱夹层粉砂质泥岩	5.0～	35	16

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表 2 抽水连通试验和水位恢复试验过程记录

Table 2. Process record of pumping connectivity test and water level recovery test

阶段	次序	开始时间	开关井顺序	开（关）井时长/h	稳定时长/h	阶段用时/h
群井抽水试验	1	0.0 h	第一批开启4口降水井 J1、J7、J9、J24	17.0	11.5	28.5
	2	28.5 h	第二批开启4口降水井 J11、J8、J21、J15	5.0	38.0	43.0
	3	71.5 h	第三批开启3口降水井 J3、J20、J18	5.0	17.0	22.0
	4	93.5 h	第四批开启2口降水井 J24（重启）、J25	5.0	75.5	80.5
水位恢复试验	5	174.0 h	第一批关停降水井 J3、J25、J18	13.0	11.5	24.5
	6	198.5 h	第二批关停降水井 J11、J8、J20、J15	13.0	11.0	24.0
	7	222.5 h	第三批关停降水井 J1、J7、J9、J24	0	46.5	46.5
注：①在抽水试验55 h时，因周边新建排水沟需要J24井关泵；②在抽水试验75 h时J21降水井损坏，为维持出水量保证水位降深要求，第四批次J24井重新开启，新开启J25井； ③312 h后水位稳定不再回升，试验结束时坑内水位距离初始水位约1.0 m，坑外距离初始水位约0.4 m。

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表 3 连通试验坑内外试验井最大降深汇总表

Table 3. Summary table of maximum drawdown of test wells inside and outside the pit for connectivity test

区位	坑外观测井最大降深/m	坑内观测井最大降深/m	降深差 /m
基坑东侧	4.11	10.82	6.71
基坑西侧	2.96	9.60	6.64
基坑南侧	3.11	9.50	6.39
基坑北侧	3.12	10.25	7.13
注：GCJ1最大降深为4.11 m，综合判断为异常数据（可能受南侧在建基坑施工影响所致）。

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表 4 基坑理论涌水量计算公式取值表

Table 4. Value-taking table of calculation formula for theoretical water inflow of foundation pit

参数	取值
基坑面积A/m²	22268.8
基坑等效半径r₀/m	84.21
降水影响半径R/m	200
基坑地下水位设计降深s_d/m	10.50
承压含水层厚度M/m	37.0
渗透系数k/（m·d⁻¹）	17.0

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参考文献(20)

[1]	冯晓腊, 蔡娇娇, 熊宗海, 等. 落底式止水帷幕条件下深基坑群井试验研究[J]. 水文地质工程地质, 2016, 43(6): 107-112. (FENG X L, CAI J J, XIONG Z H, et al. Research on well group pumping test for foundation pit with drop waterproof curtains[J]. Hydrogeology & Engineering Geology, 2016, 43(6): 107-112. (in Chinese) doi: 10.16030/j.cnki.issn.1000-3665.2016.06.17 FENG X L, CAI J J, XIONG Z H, et al. Research on well group pumping test for foundation pit with drop waterproof curtains[J]. Hydrogeology & Engineering Geology, 2016, 43（6）: 107-112. (in Chinese) doi: 10.16030/j.cnki.issn.1000-3665.2016.06.17
[2]	蔡娇娇. 落底式止水帷幕条件下承压含水层基坑降水设计方法研究[D]. 武汉: 中国地质大学, 2018. (CAI J J. Study on dewatering design method of foundation pit with drop waterproof curtain in confined aquifer[D]. Wuhan: China University of Geosciences, 2018. (in Chinese) CAI J J. Study on dewatering design method of foundation pit with drop waterproof curtain in confined aquifer[D]. Wuhan: China University of Geosciences, 2018. (in Chinese)
[3]	冯红超. 落底式帷幕在地下结构永久主动抗浮工程应用中的渗透性研究[J]. 工程勘察, 2018(8): 24-29,36. (FENG H C. Study on the permeability of closed groundwater cut-off curtain in the active anti-uplifting engineering[J]. Geotechnical Investigation & Surveying, 2018(8): 24-29,36. (in Chinese) FENG H C. Study on the permeability of closed groundwater cut-off curtain in the active anti-uplifting engineering[J]. Geotechnical Investigation & Surveying, 2018（8）: 24-29,36. (in Chinese)
[4]	余永强, 刘微, 唐冬雪. 止水帷幕作用下基坑渗流场特性分析[J]. 洛阳理工学院学报(自然科学版), 2011, 21(3): 24-27,32. (YU Y Q, LIU W, TANG D X. Analysis on the seepage field characteristic of excavation with waterproof structure[J]. Journal of Luoyang Institute of Science and Technology (Natural Science Edition), 2011, 21(3): 24-27,32. (in Chinese) doi: 10.3969/j.issn.1674-5043.2011.03.007 YU Y Q, LIU W, TANG D X. Analysis on the seepage field characteristic of excavation with waterproof structure[J]. Journal of Luoyang Institute of Science and Technology (Natural Science Edition), 2011, 21（3）: 24-27,32. (in Chinese) doi: 10.3969/j.issn.1674-5043.2011.03.007
[5]	XU Y S, SHEN S L, DU Y J, et al. Modelling the cutoff behavior of underground structure in multi-aquifer-aquitard groundwater system[J]. Natural Hazards, 2013, 66(2): 731-748. doi: 10.1007/s11069-012-0512-y
[6]	阎波, 太俊, 胡科, 等. 部分落底式止水帷幕在基坑降水中的应用[J]. 长江科学院院报, 2023, 40(9): 98-105. (YAN B, TAI J, HU K, et al. Application of partially-closed impervious curtain to foundation pit dewatering[J]. Journal of Changjiang River Scientific Research Institute, 2023, 40(9): 98-105. (in Chinese) doi: 10.11988/ckyyb.20220477 YAN B, TAI J, HU K, et al. Application of partially-closed impervious curtain to foundation pit dewatering[J]. Journal of Changjiang River Scientific Research Institute, 2023, 40（9）: 98-105. (in Chinese) doi: 10.11988/ckyyb.20220477
[7]	陈青, 陈惠敏. 深大基坑基底破碎基岩裂隙水施工处治技术[J]. 湖南交通科技, 2019, 45(2): 157-159. (CHEN Q, CHEN H M. Construction and treatment technology of fractured bedrock fissure water in deep and large foundation pit base[J]. Hunan Communication Science and Technology, 2019, 45(2): 157-159. (in Chinese) CHEN Q, CHEN H M. Construction and treatment technology of fractured bedrock fissure water in deep and large foundation pit base[J]. Hunan Communication Science and Technology, 2019, 45（2）: 157-159. (in Chinese)
[8]	汪勋文, 江继. 止水帷幕深度对地下水渗流规律的影响分析[J]. 山西建筑, 2022, 48(22): 74-78. (WANG X W, JIANG J. Analysis of influence of water-stop curtain depth on groundwater seepage law[J]. Shanxi Architecture, 2022, 48(22): 74-78. (in Chinese) doi: 10.13719/j.cnki.1009-6825.2022.22.019 WANG X W, JIANG J. Analysis of influence of water-stop curtain depth on groundwater seepage law[J]. Shanxi Architecture, 2022, 48（22）: 74-78. (in Chinese) doi: 10.13719/j.cnki.1009-6825.2022.22.019
[9]	袁斌, 武永霞, 廖少明, 等. 基于数值模拟的富水砂砾地层深基坑降水方案优化[J]. 工程勘察, 2017, 45(1): 34-39. (YUAN B, WU Y X, LIAO S M, et al. Optimization of deep excavation pit dewatering in water-rich sand and gravel strata based on numerical model[J]. Geotechnical Investigation & Surveying, 2017, 45(1): 34-39. (in Chinese) YUAN B, WU Y X, LIAO S M, et al. Optimization of deep excavation pit dewatering in water-rich sand and gravel strata based on numerical model[J]. Geotechnical Investigation & Surveying, 2017, 45（1）: 34-39. (in Chinese)
[10]	冯晓腊, 李栋广. 落底式止水帷幕条件下基坑涌漏量计算[J]. 水文地质工程地质, 2013, 40(5): 16-21. (FENG X L, LI D G. Chung leakage quantity calculation of foundation pit on the condition of the cut-off wall insert into impermeable layer[J]. Hydrogeology & Engineering Geology, 2013, 40(5): 16-21. (in Chinese) FENG X L, LI D G. Chung leakage quantity calculation of foundation pit on the condition of the cut-off wall insert into impermeable layer[J]. Hydrogeology & Engineering Geology, 2013, 40（5）: 16-21. (in Chinese)
[11]	杨建民, 隋颜阳. 一种软土地区深基坑涌水量计算方法[J]. 铁道建筑, 2017, 57(11): 94-97. (YANG J M, SUI Y Y. A calculation method on water inf low of deep foundation pit in soft soil area[J]. Railway Engineering, 2017, 57(11): 94-97. (in Chinese) doi: 10.3969/j.issn.1003-1995.2017.11.23 YANG J M, SUI Y Y. A calculation method on water inf low of deep foundation pit in soft soil area[J]. Railway Engineering, 2017, 57（11）: 94-97. (in Chinese) doi: 10.3969/j.issn.1003-1995.2017.11.23
[12]	LUO G Y, HONG C. Using zero-thickness elements to simulate suspended cut-off walls in a regional seepage field[J]. Computers and Geotechnics, 2006, 33(6/7): 305-315. doi: 10.1016/j.compgeo.2006.07.004
[13]	VILARRASA V, CARRERA J, JURADO A, et al. A methodology for characterizing the hydraulic effectiveness of an annular low-permeability barrier[J]. Engineering Geology, 2011, 120(1/4): 68-80. doi: 10.1016/j.enggeo.2011.04.005
[14]	PUJADES E, ORBAN P, BODEUX S, et al. Underground pumped storage hydropower plants using open pit mines: How do groundwater exchanges influence the efficiency?[J]. Applied Energy, 2017, 190: 135-146. doi: 10.1016/j.apenergy.2016.12.093
[15]	YANG T, TONG L Y, HESHAM EL NAGGAR M, et al. Hydraulic head difference at two sides of suspended waterproof curtain during multi-grade dewatering of excavation[J]. Underground Space, 2023, 10: 137-149. doi: 10.1016/j.undsp.2022.10.002
[16]	WU Y X, SHEN S L, YUAN D J. Characteristics of dewatering induced drawdown curve under blocking effect of retaining wall in aquifer[J]. Journal of Hydrology, 2016, 539: 554-566. doi: 10.1016/j.jhydrol.2016.05.065
[17]	吕斌泉, 冯晓腊, 蔡娇娇, 等. 落底式止水帷幕条件下基坑涌水量计算研究[J]. 岩土工程技术, 2020, 34(1): 18-23. (LV B Q, FENG X L, CAI J J, et al. Water inflow calculation of foundation pit under the condition of bottom-type waterproof curtain[J]. Geotechnical Engineering Technique, 2020, 34(1): 18-23. (in Chinese) LV B Q, FENG X L, CAI J J, et al. Water inflow calculation of foundation pit under the condition of bottom-type waterproof curtain[J]. Geotechnical Engineering Technique, 2020, 34（1）: 18-23. (in Chinese)
[18]	万昊, 冯庆高, 蔡兵华, 等. 落底式止水帷幕条件下承压含水层水文地质参数计算方法研究[J]. 安全与环境工程, 2024, 31(1): 57-66,74. (WAN H, FENG Q G, CAI B H, et al. Calculation methods for hydrogeological parameters of confined aquifers under the condition of drop waterproof curtain[J]. Safety and Environmental Engineering, 2024, 31(1): 57-66,74. (in Chinese) WAN H, FENG Q G, CAI B H, et al. Calculation methods for hydrogeological parameters of confined aquifers under the condition of drop waterproof curtain[J]. Safety and Environmental Engineering, 2024, 31（1）: 57-66,74. (in Chinese)
[19]	张雅洁. 不同类型止水帷幕基坑涌水量计算方法探讨[J]. 海河水利, 2023(8): 98-100. (ZHANG Y J. Calculation method of water inrush in the foundation pit of different types of water-resisting curtain[J]. Haihe Water Resources, 2023(8): 98-100. (in Chinese) ZHANG Y J. Calculation method of water inrush in the foundation pit of different types of water-resisting curtain[J]. Haihe Water Resources, 2023（8）: 98-100. (in Chinese)
[20]	中华人民共和国住房和城乡建设部. 建筑基坑支护技术规程: JGJ 120—2012[S]. 北京: 中国建筑工业出版社, 2012. (Ministry of Housing and Urban Rural Development of the People’s Republic of China. Technical specification for retaining and protection of building foundation excavations: JGJ 120—2012[S]. Beijing: China Architecture & Building Press, 2012. (in Chinese) Ministry of Housing and Urban Rural Development of the People’s Republic of China. Technical specification for retaining and protection of building foundation excavations: JGJ 120—2012[S]. Beijing: China Architecture & Building Press, 2012. (in Chinese)