摘要
在城市地下水位下进行深基坑开挖时,准确预测地表沉降是保障施工安全的关键.深基坑开挖和降水是发生沉降变形的两个耦合因素.文中旨在揭示两个因素的耦合响应,建立预估地表变形的经验方法,并以某超高层建筑基坑为例,采用解析法和数值法,计算地表沉降值,将开挖和降水耦合下的解析法计算结果添加到总沉降中,建立三维耦合数值模型.与监测数据相比,数值模拟结果与监测数据较吻合.此外,通过多项式拟合,建立了经验地表沉降的方程,说明地基开挖和降水对地表总沉降影响的贡献度.
Abstract
Accurately predicting surface settlement during deep excavation of foundation pits under the groundwater level in cities is crucial to ensuring construction safety.Deep excavation and dewatering are two coupling factors that cause settlement deformation.This study aims to reveal the coupled response of two factors and establish an empirical method for estimating surface deformation.Taking the foundation pit of a super high-rise building as an example,the surface settlement value was calculated using analytical and numerical methods.The calculation results of the analytical method under the coupling of excavation and precipitation were added to the total settlement,and a three-dimensional coupled numerical model was established.Compared with the monitoring data,the numerical simulation results are in good agreement with the monitoring data.In addition,an empirical equation for surface settlement was established through polynomial fitting to illustrate the contribution of foundation excavation and precipitation to the total surface settlement.
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