摘要
城市地铁车站降水施工对周边环境及既有结构安全稳定性影响是城镇地下交通工程广泛关注的研究问题之一。基于分层总和法分别给出了在表层孔隙性潜水,或在承压含水层中降水施工引起周边土层沉降规律分析公式。以某地铁车站工程为背景,就车站降水施工引起周边地表沉降规律进行了应用研究;利用分析结果对影响区内的重要结构工程的安全稳定性进行了评价研究。实例分析表明,不同含水层的降水对地表沉降影响不同;在距基坑较近范围内,潜水含水层降水对既有建筑结构基础沉降影响较大。在该工程施工中,应更加注重潜水含水层降水施工对临近建筑结构的影响观测与监控。所给公式简单方便,可用于设计期间进行降水施工对周边环境及既有结构影响的简单估算。
The influence on safety and stability of the environment and existing structures caused by surrounding urban metro station dewatering construction is one of the problems widespread concerned in urban underground traffic engineering projects.Based on layer-wise summation method,the paper puts forward analytically formulas of settlement in surrounding soil caused by dewatering construction in both surface porosity phreatic aquifer and confined aquifer respectively.Taking a metro station project as an example,on law of surface settlement induced by dewatering construction of the station were researched;Using the results of the research to study the safety and stability of the significant structure in the affected zone.Case study shows that,the dewatering construction of different aquifers has different impact on surface settlement,from the foundation pit close range,phreatic aquifer dewatering construction has greater influence on foundation settlement of existing building structures;therefore,during the project,more attention should be paid to observe and monitor phreatic aquifer＇s dewatering construction impaction on adjacent structures.The formulas given in this paper are simple and convenient,and can be used in dewatering construction of simple estimation of effects on the surrounding environment and existing structures.
出处
《科学技术与工程》
北大核心
2015年第3期264-269,共6页
Science Technology and Engineering
关键词
地铁车站
降水
地表沉降
分层总和法
安全评价
metro station dewatering surface settlement layer-wise summation method safety evaluation
