武汉古河道承压水井流理论及在基坑降水中应用

吕斌泉; 冯晓腊; 熊宗海

doi:10.11779/CJGE202003015

武汉古河道承压水井流理论及在基坑降水中应用 English Version

1.
中国地质大学（武汉）工程学院,湖北　武汉　430074
2.
武汉丰达地质工程有限公司,湖北　武汉　430074

基金项目:

国家自然科学基金项目 41702336

武汉市政建设集团科技计划项目 wszky201820

详细信息

作者简介:
吕斌泉（1994— ）,男,硕士,主要从事岩土体稳定性、地下水渗流等方面研究。E-mail：cuglvbinquan@163.com

通讯作者:
冯晓腊, E-mail：fengdafxl@126.com

中图分类号: TU46.3
计量
- 文章访问数: 299
- HTML全文浏览量: 18
- PDF下载量: 243
出版历程
- 收稿日期: 2019-06-04
- 网络出版日期: 2022-12-07
- 刊出日期: 2020-02-29

Theory of artesian well flow in ancient river in Wuhan and its application in foundation pit dewatering

1.
Department of Engineering, China University of Geosciences, Wuhan 430074, China
2.
Wuhan FengDa Geological Engineering Ltd, Wuhan 430074, China

摘要

摘要: 在分析武汉市古河道特殊水文地质条件的基础上,建立古河道水文地质模型,将古河道承压水井流问题概化为带状承压含水层中地下水向抽水井的运动问题；然后结合镜像法原理,引入吉林斯基势函数,推导出古河道承压、承压-无压完整井稳定流解析表达式。基于此,将其应用于基坑降水工程中,提出适用于古河道承压含水层中基坑涌水量计算方法；最后以武汉梨园广场地下停车场深基坑工程为例进行计算分析,并将结果与传统方法计算结果和实际监测数据分别进行对比,结果显示所述计算方法所得结果与基坑实际涌水量相对误差仅为7.4%,而采用传统大井法相对误差达到54.5%,验证了所提出计算方法的合理性。研究结果对于认识古河道承压含水层地下水井流规律以及指导基坑降水设计具有重要意义。
- 古河道 /
- 承压水 /
- 井流 /
- 完整井 /
- 稳定流 /
- 基坑降水
Abstract: Based on the analysis of the special hydrogeological conditions of an ancient river in Wuhan, a hydrogeological model for the ancient river is established. The problem of artesian well flow in the ancient river is generalized to that of groundwater movement to pumping wells in belt-like artesian aquifers. Then, based on the principle of mirror method and the potential function, the formulas of steady flow for artesian and artesian-unartesian completely penetrating wells in the ancient river are derived. On this basis, it is applied to the foundation pit dewatering project, and a method for calculating the water inflow of the foundation pit of artesian aquifers in the ancient river is put forward. Finally, taking the deep foundation pit of the underground parking lot of Liyuan Plaza in Wuhan as an example, the calculated results are compared with those of the traditional methods and the actual monitoring data. The results show that the relative error between the calculated results and the actual water inflow of the foundation pit is only 7.4%, while the relative error of the traditional method is 54.5%, which verifies the rationality of the proposed method. The research results are of great significance for understanding the theory of artesian well flow in ancient rivers and for guiding the design of foundation pit dewatering projects.
- ancient river /
- artesian water /
- well flow /
- completely penetrating well /
- steady flow /
- foundation pit dewatering

HTML全文

图 1 武汉市古河道平面分布示意图

Figure 1. Plane distribution map of an ancient river in Wuhan

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图 2 汉阳段古河道地层剖面图

Figure 2. Stratigraphic profile of ancient river in Hanyang

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图 3 武汉古河道纵向厚度变化示意图

Figure 3. Schematic of change of longitudinal thickness of the ancient river in Wuhan

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图 4 古河道承压含水层水位变化示意图

Figure 4. Schematic chart of change of water level of artesian aquifer in the ancient river

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图 5 古河道承压含水层水文地质模型

Figure 5. Hydrogeological model for artesian aquifer in ancient river

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图 6 古河道承压含水层抽水井的镜像投影

Figure 6. Mirror projection of pumping well of artesian aquifer in the ancient river

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图 7 古河道含水层抽水井降水漏斗

Figure 7. Precipitation funnel of pumping well of artesian aquifer in the ancient river

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图 8 梨园广场停车场地层剖面图

Figure 8. Stratigraphic profile of underground parking lot of Liyuan Plaza

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图 9 井位布置图

Figure 9. Layout of wells

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图 10 单井抽水试验s-t图

Figure 10. s-t diagram of single-well pumping tests

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图 11 单井抽水试验Q-t图

Figure 11. Q-t diagram of single-well pumping test

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表 1 单井抽水试验数据表

Table 1 Data table of single-well pumping test (m)

类别	井编号	静水位标高	水位降深	稳定水位标高
抽水井	J24	17.60	11.98	5.62
观测井	J23	17.55	4.40	13.15
	J08	17.55	4.82	12.71
	J25	17.60	4.26	13.34
	J26	17.60	2.12	15.48

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表 2 渗透系数计算表

Table 2 Calculation of permeability coefficient

井号	Q/(m³·d^-1)	r/m	s/m	a/m	l/m	M/m	x	y	K/(m·d^-1)
J24	1080	0.125	11.98	100	1000	35.4	105	0	—
J23	—	21.227	4.4	—	—	—	112	21	3.41
J08	—	19.357	4.82	—	—	—	101	16	3.11
J25	—	25.621	4.26	—	—	—	111	26	3.51
J26	—	48.941	2.12	—	—	—	112	49	4.90
均值	—								3.48

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表 3 基坑涌水量计算表

Table 3 Calculation of water inflow of foundation pit

方法	K/(m·d^-1)	M/m	H₀/m	h/m	R/m	r₀/m	A/m	l/m	Q/(m³·d^-1)
本文计算方法	3.48	35.4	43.8	31.05	223	81	100	1000	4898.2
传统大井法	3.31	35.4	43.8	31.05	218	81	100	1000	7044.7

下载: 导出CSV

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