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以软土地区的市政管线、电缆隧道、电厂管网为代表的深窄基坑,由于开挖宽度较小,基坑外侧土体不符合半无限体假设,采用现行建筑基坑支护技术规程推荐的计算方法将产生较大误差。该文基于毕晓普条分法,利用弹性力学理论,分别提出了软土地区半无限宽基坑和深窄基坑,以最下层支点为轴心的整体滑动稳定性的解析解,同时采用plaxis数值软件,通过c、φ折减法,验算半无限基坑和深窄基坑以最下层支点为轴心的整体滑动安全系数,并将其规律性与解析解比对。研究发现达到相同安全系数,深窄基坑所需嵌固深度远小于半无限宽基坑。
Due to the small width of excavation, the soil outside the foundation pit does not meet the semi-infinite body assumption, the existing technology of deep foundation pit supporting technology is adopted to design deep deep foundation pit represented by municipal pipeline, cable tunnel and power plant pipe network in soft soil area. The recommended calculation method will produce a larger error. Based on the Bishop method and the theory of elasticity, the analytical solutions of the global sliding stability of a semi-infinite wide foundation pit and a deep narrow foundation pit in the soft soil region are presented respectively. The plaxis value Software, by c, φ reduction method, checking the semi-infinite foundation pit and deep foundation pit with the lowest level of the fulcrum as the axis of the overall sliding safety factor, and its regularity and analytical solutions. The study found that to achieve the same safety factor, the depth of embedding required for deep foundation pit is much smaller than that of semi-infinite wide foundation pit.