论文部分内容阅读
在基坑工程中地下水对基坑支护结构性能的影响不能忽视。本文以张掖市某深基坑工程为背景,论述了复合支护土钉墙(上部土钉墙支护,下部排桩预应力锚杆支护)设计要点,同时对降水设计进行了详细的论述,并且利用岩土分析软件PLAXIS,采用HSS土体高级本构模型对此工程进行了数值分析计算,分析结果表明:降水作用对基坑坑底的隆起量影响较小,但对基坑壁的侧向变形影响较大,同时设计软件计算的排桩桩身弯矩值比考虑降水条件下和未考虑降水条件下的弯矩值都大,因此设计结果偏于保守。最后在降水条件下基坑地表的沉降量比一般条件都大,这与地下水的源汇项和土体参数有关。
The effect of groundwater on the supporting structure of foundation pit in foundation pit engineering can not be neglected. In this paper, a deep foundation pit project in Zhangye City as the background, discusses the design of soil-nailing composite wall (top soil nailing wall support, the lower row of prestressed anchor bolt support) design points, at the same time on the precipitation design in detail , And the rock mass analysis software PLAXIS was used to carry out numerical analysis and calculation of this project with the HSS soil advanced constitutive model. The results show that: the precipitation has little effect on the uplift of the pit bottom, Lateral deformation has a greater impact, while design software calculations of pile bending moment than the value of considering the case of precipitation and not considering the bending moment values are large, so the design results are somewhat conservative. Finally, under the condition of precipitation, the settlement of foundation pit is larger than the general conditions, which is related to the source and sink of groundwater and soil parameters.