新型装配式挡土墙稳定性影响因素敏感度分析

Sensitivity Analysis of Stability Influential Factors of New Assembled Retaining Wall

新型装配式挡土墙相比于传统重力式挡土墙有自重小、地基承载力要求低、适应性强、用料节省、施工时间短等优势,且可实现节能、节水、节材和环保的目的,是挡土墙设计研究的重要方向。相对于传统重力式挡土墙,装配式挡土墙需要更多地考虑墙体自重的减小、装配结构的拼接等导致的变形及稳定性问题,因此重点对装配式挡土墙稳定性问题进行了探讨。首先在对传统重力式挡土墙稳定性研究的基础上,以倾斜式墙背挡土墙为例,按照规范规定计算了挡土墙的相关安全系数;继而利用敏感度分析的方法,逐个分析了墙中填料的容重、墙后填土内摩擦角和墙背倾角在新型装配式挡土墙稳定性中所起的作用;最后分析了各因素对挡土墙稳定性的影响程度,找出了影响挡土墙稳定性的主要因素,并提出了新型装配式斜墙背挡土墙设计中应当注意的各种问题,为新型装配式挡土墙的设计提供了一定的依据。

Compared with the traditional gravity retaining wall,the new assembled retaining wall has the advantages such as small self-weight,low requirements for foundation bearing capacity,strong adaptability,saving materials and short construction time,and can achieve the purposes of energy saving,water saving,material saving and environmental protection.It is an important direction of retaining wall design and research.Compared with the traditional gravity retaining wall,the deformation and stability problems caused by the reduction of wall self-weight and the splicing of assembly structure needed to be considered more.Therefore,the stability of assembled retaining wall was focused and discussed.Firstly,based on the study of the stability of the traditional gravity retaining wall,the inclined wall back retaining wall was taken as an example,and the relevant safety coefficients of the retaining wall were calculated according to the norm.And then the sensitivity analysis method was used to analyze the effects of the bulk density of the filler in the wall,the internal friction angle of the backfill and the inclination angle of the wall back on the stability of the new assembled retaining wall one by one.Finally,the influence degree of various factors on the stability of retaining wall was studied,and the main factors affecting the stability of retaining wall were found out.The problems that should be paid attention to in the design of the new type of assembly inclined wall back retaining wall are put forward,which provides a certain basis for the design of the new assembled retaining wall.