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对软土地层中的深基坑工程,要可靠地解决基坑稳定和控制坑周土体位移问题,需要研究的不明确因素较多,其中一个难题是如何评估和处理软土的流变性对支护墙体内力和位移的影响。由于土体的各向异性、土工试验的技术局限性和施工因素的复杂性,在基坑施工中各工况下的不断变化的流变参数难以测准,而支护墙体的内力和位移也就难以预测。目前国内外对此问题尚缺少解决的理论和方法。因此在软土地区的建筑物和市政公用设施密集的地区,要按控制土体位移保护环境的要求,进行深基坑设计和施工,就带有风险性。
For deep foundation pit projects in soft ground, it is necessary to study more uncertain factors to solve the problem of stability of foundation pit and controlling the displacement of soils around the pit. One of the problems is how to evaluate and deal with the rheological properties of soft soils Impact of internal forces and displacements of supporting walls. Due to the anisotropy of soil, the technical limitations of geotechnical test and the complexity of construction factors, the changing rheological parameters under various conditions in foundation pit construction are difficult to calibrate. However, the internal forces and displacements of retaining wall body It is difficult to predict. At present, there are still a few theories and methods to solve this problem at home and abroad. Therefore, in the soft soil area buildings and municipal public facilities intensive areas, according to the control of soil displacement and environmental protection requirements, deep foundation pit design and construction, with the risk.