摘要
为合理评估地下结构在使用寿命周期内的抗浮性能,设计一种多功能模型试验系统,模拟不同水力梯度作用下重塑黄土和粉质黏土中孔隙水压力的传递过程,开展竖向渗流条件和侧向渗流条件下两种土体介质中地下结构承受水压变化规律试验;基于修正K-C(Kozeny-Carman)渗流理论提出用于描述弱渗透性土体介质中孔压竖向传递的数学模型。研究结果表明:在相同水力梯度作用下粉质黏土中同一测点的孔压值较重塑黄土中小,且趋于稳定所需时间较长;当两种土体介质中发生竖向渗流或侧向渗流时,地下结构承受的水压均比理论静水压力小;所提出的数学模型能够较好地描述重塑黄土和粉质黏土介质中孔压的传递过程;在实际工程中,应考虑结构自身对地下渗流场的影响和特殊土体介质对孔隙水渗流的影响,从而实现更合理的抗浮设计。
To comprehensively evaluate the floating⁃resistant performance of underground structures over their service life,a sophisticated multifunctional model test system was devised.The experimental system was utilized to simulate the transmission process of pore water pressure in remolded loess and silty clay under various hydraulic gradients.Experimental tests were conducted to investigate the variation of water pressure on underground structures in two soil mediums with vertical seepage conditions and lateral seepage conditions.A mathematical model based on the modified Kozeny⁃Carman(K⁃C)permeability theory was proposed to describe the vertical transmission of pore pressure in low⁃permeability soil medium.The research results demonstrate that,under identical hydraulic gradients,the pore pressure values at the same monitoring location in the silty clay medium are comparatively smaller than those observed in the remolded loess medium,so a longer duration is required for the pore pressure to attain a state of stability in the silty clay medium.When vertical seepage or lateral seepage occurs in both soil mediums,the water pressure acting on underground structures is lower than the theoretical hydrostatic pressure.The proposed mathematical model possesses good predictive capability in describing the process of pore pressure transmission in remolded loess and silty clay media.In practical applications,it is crucial to consider the influence of the structure on the groundwater flow field and the effects of special soil medium on pore water seepage.This consideration is essential for achieving more accurate and scientifically grounded floating⁃resistant designs。
作者
梁泽田
郑山锁
刘晓航
胡文乐
杜宜阳
宋枳含
Liang Zetian;Zheng Shansuo;Liu Xiaohang;Hu Wenle;Du Yiyang;Song Zhihan(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2024年第8期83-96,共14页
China Civil Engineering Journal
基金
国家自然科学基金(52278530)
国家重点研发计划课题(2019YFC1509302)
陕西省重点研发计划(2021ZDLSF06-10)。
关键词
水浮力
地下结构
模型试验
孔隙水压力
阻挡效应
water buoyancy
underground structure
model testing
pore water pressure
cutoff effect
作者简介
梁泽田(1997—),男,博士研究生。主要从事地下结构抗浮方面的研究;通讯作者:郑山锁(1960—),男,博士,教授。主要从事工程结构防灾减灾方面的研究;刘晓航(1995—),男,博士研究生。主要从事结构防灾减灾方面的研究;胡文乐(1995—),男,博士研究生。主要从事岩土工程灾害与防治方面的研究;杜宜阳(1999—),男,硕士研究生。主要从事地下结构抗浮方面的研究;宋枳含(1999—),男,硕士研究生。主要从事地下结构抗浮方面的研究。
