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基于《建筑基坑支护技术规程》的相关规定和非饱和土强度理论,建立了考虑预留土的嵌固和水平支撑双重作用和非饱和特性时支护结构嵌固深度、位移和内力的计算方法。研究表明,预留土的作用可以概括为两个方面:①虽然能提供的水平抗力不是很大,但由于其合力力臂较大,因此对支护结构有明显的嵌固作用,从而可以缩短支护结构的嵌固深度;②能在支护结构上部形成弹性支承,从而减小支护结构的水平位移和内力。算例分析表明,采用预留土并降水的施工方法能大幅度缩小支护结构的嵌固深度、位移和内力。因此,在条件适当的条件下,用基坑内侧预留土并降水的施工方法不仅可以省去水平支撑、降低支护结构嵌固深度,同时还可以节约投资和缩短工期,具有良好的经济效益、社会效益和环境效益。
Based on the relevant regulations of Technical Code for Construction of Foundation Pit and the strength theory of unsaturated soil, the establishment of embedded depth, displacement and internal force of retaining structure considering the dual action and unsaturated characteristic of retaining soil and horizontal support Calculation method. The study shows that the role of soil reservation can be summarized in two aspects: ① although the level of resistance provided is not great, but because of its large force arm, so the support structure has a significant role in embedding, which can be shortened Supporting structure of the embedded depth; ② can support the upper part of the elastic support structure, thereby reducing the horizontal displacement of supporting structure and internal force. The case study shows that the construction method using reserved soil and precipitation can greatly reduce the embedded depth, displacement and internal force of supporting structure. Therefore, under appropriate conditions, the construction method of reserving soil and precipitation in the inner side of the foundation pit can not only eliminate the horizontal support, reduce the embedded depth of the supporting structure, but also save investment and shorten the construction period, and has good economic benefits , Social benefits and environmental benefits.