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（同濟(jì)大學(xué)地下建筑與工程系上海  200092）

［提要］在上海某地鐵基坑的施工過(guò)程中，臨近建筑物產(chǎn)生了較大的整體沉降，而且不均勻沉降明顯。結(jié)合工程實(shí)測(cè)數(shù)據(jù)及該處的土層分布條件，對(duì)基坑工程不同施工階段引起建筑物沉降的原因進(jìn)行了分析。結(jié)果表明，基坑圍護(hù)墻體較大的水平位移以及建筑物所處軟弱粘土的流變變形使建筑物產(chǎn)生了不小的整體沉降，而建筑物下方局部分布的不良地質(zhì)條件則是建筑物產(chǎn)生明顯不均勻沉降的主要原因。通過(guò)分析，以期引起工程技術(shù)人員對(duì)不良地質(zhì)對(duì)工程及周邊環(huán)境不利影響的重視，其他類(lèi)似工程能加以借鑒。

［關(guān)鍵詞］深基坑  不良地質(zhì)  建筑物  沉降變形分析 

Analysis on Differential Settlement of Building Caused by Deficient Geological Condition/Liu Guobin, Liu Dengpan（Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China）

Abstract: Large settlement and differential settlement occur on a building near one metro foundation pit during construction of the deep foundation pit. Factors influencing the settlement of building according as several main construction stages are analyzed based on the measured data and geology condition. The result shows that the large horizontal displacement of diaphragm wall and rheological deformation of soft clay under building are the reasons which make major settlement occur on the building. In addition, the deficient geological condition under the building is the main factor of larger differential settlement of the building. It is hoped that engineers can attach more importance to the disadvantageous influence of deficient geological condition, and the results could serve valuably for other similar engineering.

Keywords:deep excavation; deficient geological condition; building settlement; deformation analysis