考虑基坑降水中总应力与土体参数变化的渗流–地面沉降耦合模型研究

doi:10.13722/j.cnki.jrme.2023.0663

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Abstract To investigate the mechanisms and calculation methods of land subsidence caused by foundation pit dewatering under the condition of variations in total stress and soil parameters，a three-dimensional numerical model of groundwater seepage in the study area is constructed in this research，with the foundation pit dewatering project in the head inverted siphon section of the Xixiayuan Water Conservancy and Irrigation Project as a case. The changes in stress，parameters and subsidence during the dewatering process of foundation pit are analyzed and compared by the method of theoretical derivation and case study. Calculation formula and methodology of seepage-subsidence coupling model in view of variation in total stress and soil parameters are proposed，and the calculation results of land subsidence under different theoretical models are compared and analyzed. The results show that the seepage-subsidence coupling model built in consideration of variation in total stress and soil parameters has the smallest calculation value and the best fitting effect with the measured value. This can reasonably explain the phenomenon that the calculated subsidence value is obviously greater than the measured value in the previous studies，which is more consistent with the actual subsidence process. The research outcomes are able to provide references and guidance for land subsidence prediction in similar projects，which is of great practical significance.

Key words： soil mechanics foundation pit dewatering total stress variation soil parameter variation coupling model land subsidence

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	Articles by authors
	DONG Xiaosong1
	ZHU Liujie2
	JIN Wenchao2
	XU Weiwei2
	ZHAO Yanrong1
	WANG Jinguo1
	MA Zhiheng1

Cite this article:

DONG Xiaosong1,ZHU Liujie2,JIN Wenchao2, et al. Study on the coupling model of seepage-land subsidence considering variations in total stress and soil parameters during foundation pit dewatering[J]. , 2024, 43(S2): 4052-4061.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0663 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/IS2/4052

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[25]	戴会超，王玲玲. 三峡深水高土石围堰工程的渗流研究[J]. 水科学进展，2005，(6)：849-852.(DAI Huichao，WANG Lingling. Seepage problems of deepwater high earth-rock cofferdam in Three Gorges Project[J]. Advances in Water Science，2005，(6)：849-852.(in Chinese))
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[27]	XU B B，LIANG A H，LI M Y. Effect of variable permeability coefficient on consolidation of ultra-soft ground under vacuum preloading[J]. Applied Mechanics and Materials，2014，580：56-60.
[28]	骆祖江，刘金宝，李朗. 第四纪松散沉积层地下水疏降与地面沉降三维全耦合数值模拟[J]. 岩土工程学报，2008，30(2)：193-198. (LUO Zujiang，LIU Jinbao，LI Lang. Three-dimensional full coupling numerical simulation of groundwater dewatering and land-subsidence in quaternary loose sediments[J]. Chinese Journal of Geotechnical Engineering，2008，30(2)：193-198.(in Chinese))
[29]	TANAKA H，HAYASHI H，YAMAZOE N. Reconsideration of the settlement behavior of peat from view point of hydraulic conductivity[J]. Soils and Foundations，2019，59(2)：316-325.
[30]	梁发云，贾亚杰，邓航，等. 深基坑降水沉降计算土体弹性参数取值方法探讨[J]. 岩土工程学报，2017，39(增2)：29-32.(LIANG Fayun，JIA Yajie，DENG Hang，et al. Discussions on elastic parameters of soil for land subsidence caused by decompression of confined aquifer in deep excavation[J]. Chinese Journal of Geotechnical Engineering，2017，39(Supp.2)：29-32.(in Chinese))
[31]	冯晓腊，熊文林，胡涛，等. 三维水-土耦合模型在深基坑降水计算中的应用[J]. 岩石力学与工程学报，2005，24(7)：1 196-1 201. (FENG Xiaola，XIONG Wenlin，HU Tao，et al. Application of 3d coupling model of seepage and stress for simulating deep foundation fits dewatering[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(7)：1 196-1 201.(in Chinese))
[32]	王建秀，吴林高，朱雁飞，等. 地铁车站深基坑降水诱发沉降机制及计算方法[J]. 岩石力学与工程学报，2009，28(5)：1 010-1 019. (WANG Jianxiu，WU Lingao，ZHU Yanfei，et al. Mechanism of dewatering-induced ground subsidence in deep subway station pit and calculation method[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(5)：1 010-1 019.(in Chinese))
[33]	王翠英，黄理兴，段卫昌，等. 深基坑降水引起周边地面沉降量值计算修正系数Ms的确定[J]. 岩土力学，2006，27(6)：1 011-1 016. (WANG Cuiying，HUANG Lixing，DUAN Weichang，et al. Determination of coefficient Ms during calculation of surrounding ground settlement due to foundation pit dewatering[J]. Rock and Soil Mechanics，2006，27(6)：1 011-1 016.(in Chinese))
[34]	于澜涛，徐光黎. 基坑降水引起地表沉降计算系数Ms的修正[J]. 科学技术与工程，2022，22(2)：700-706.(YU Lantao，XU Guangli. Modification of calculation coefficient of surface settlement caused by foundation pit dewatering[J]. Science Technology and Engineering，2022，22(2)：700-706.(in Chinese))
[35]	CARMAN P C. Fluid flow through granular beds[J]. Chemical Engineering Research and Design，1937，75：S32-S48.