摘要
宁波地区广泛分布海相沉积软土,轨道交通基坑地质条件较差,风险大。以轨道交通福明路站二期基坑为背景,运用FLAC-3D软件建立基坑三维数值分析模型,对基坑施工进行全过程动态模拟。在基坑开挖之前布置详细监测方案,实行信息化施工,测试获得了基坑主动土压力、被动土压力、孔隙水压力、墙体和土体的水平位移及地表沉降规律。最后,将数值计算结果与监测结果进行了对比分析,结果表明:计算得到的水平位移和地表沉降曲线实测值基本一致,验证了计算结果的适用性,其结果可为类似基坑工程的设计和施工提供有益参考。
Due to extensive distribution of marine soft soil in Ningbo city, there are poor geological conditions and great risk for foundation pit of rail transport. In this paper, the second stage excavation of foundation for Fuming road station is taken as background. FLAC-3D software is used to set up three-dimensional numerical analysis model to analyze the full dynamic process of foundation pit construction. Detailed layout is designed prior to the excavation monitoring programme, and informatization construction is implemented, then, the law of active and passive earth pressures, pore water pressure, horizontal displacements of the wall and soil and surface subsidence are obtained. Finally, a comparative analysis of the results of numerical calculation and monitoring results is carried out and it is shown that the evaluation result of horizontal displacement and settlement is basically consistent with measured value, which verifies the applicability of the calculation results. This result can provide a useful reference for the design and construction of similar foundation pit.
出处
《地下空间与工程学报》
CSCD
北大核心
2012年第A01期1517-1526,共10页
Chinese Journal of Underground Space and Engineering
基金
宁波市重大科技攻关项目资助(2009C50004)
关键词
轨道交通
基坑
动态开挖
数值模拟
rail transport
foundation pit
dynamic excavation
numerical simulation
