基槽强度对悬臂式挡土墙内力和破坏模式的影响

EFFECT OF FOUNDATION TRENCH STRENGTH TO ENDOGEN FORCE AND FAILURE MODEL OF CANTILEVER RETAINING WALL

本文基于悬臂式挡土墙设计计算的发展现状,考虑到传统计算方法对墙身及其周围岩土体共同作用的认识存在一定的不足,采用以内力分析为主要手段,进一步加深了对于悬臂式挡土墙工作模式的认识。根据悬臂式挡土墙的施工特点和工程应用情况,并结合岩土强度理论和有限单元法建立了悬臂式挡土墙的受力分析模型。着重分析了基槽强度变化对墙身内力分布和墙体变形的影响,同时还对基槽岩土体的屈服变形程度和悬臂式挡土墙的破坏模式做了一定的研究,并得到了一些结论,以期对悬臂式挡土墙的设计计算提供一些帮助。

The thesis is based on the several existing theories about the design and calculation of cantilever retaining wall which has been widely used for strengthening the slope stability. In our country, some conventional methods using the balance principle of outer force are usually made use of to resolve a series of problems about the cantilever retaining wall. Normally, traditional methods ignore the influence of inner force itself. So the results are not exact enough to meet some needs of engineers. Some novelty techniques emerge in the calculation field of civil engineering, such as the finite element method and so on. These methods help us to recognize and analyze complex problems further. The geotechnical mechanism and structural mechanism are also developed in the meantime. The interact influence between mass rock and the structure has not been recognized thoroughly. The speed of development of calculation level about the cantilever retaining wall is still too low to meet the demands which are virtually derived from engineers. The article is based on the advanced geotechnical mechanism and rock mass mechanism, and the finite element method is also used to calculate the inner force of cantilever retaining wall. There are many factors which contribute to the endogen force distribution and deformation of cantilever retaining wall. Considering all these, the writes mainly analyze the relationship between the strength of foundation trench and the distribution of endogen force. The deformations of the cantilever retaining wall are compared in different conditions. The field deformation and failure model of different strength conditions are studied at the same time. The imitating and calculation model of cantilever retaining wall is set up according to the factual physical and mechanical properties of foundation trench and slope above it. Recording the variable date including the strength of foundation trench, the endogen force and deformation of cantilever retaining wall in several different conditions is essential by virtue of study purpose. The variation of the strain energy is also observed in the same zone of cantilever retaining wall. According to the study and analysis, the loss of the ability to retain is not always due to the crack of the concrete and steel which compose the wall body, the destruction of foundation trench is also an critical reason. So compacting the foundation trench is indispensable in the process of construction for cantilever retaining wall. In sum, the present calculation theories are not prefect, the article are hoped to be benefit to the design and calculation of the cantilever retaining wall.