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与其他材料不同,土体的力学性能分析必须建立在其所处应力状态的基础上进行。基于这一思想,在对深基础进行变形分析时,根据基础建设的施工工艺,将整个分析过程划分为施工前的准备工作、基坑降水、基坑开挖、结构施工和地下水位回升五个工况;同时为凸显问题核心,简化分析过程,假定每个工况中荷载的加、卸均瞬时发生,且基础为等补偿基础(结构荷重与挖除的土重相等)。在此基础上,详细分析五种工况中坑底土体所处的应力状态,并进行对比分析,计算出各工况下土体大、小主应力的增量变化,绘制出坑底土体经历的有效应力路径,指出在基础建造过程中,坑底土体将经历复杂的应力变化过程,对土体的强度和变形都将产生很大影响。
Different from other materials, the analysis of mechanical properties of soil must be based on the stress state of the soil. Based on this idea, in the deformation analysis of deep foundation, according to the construction technology of infrastructure, the whole analysis process is divided into the preparatory work before construction, foundation pit dewatering, excavation, structural construction and groundwater level rise five At the same time, in order to highlight the core of the problem and simplify the analysis process, it is assumed that the loading and unloading in each condition occur instantaneously, and the foundation is equal compensation basis (the structural load is equal to the excavation soil weight). On this basis, the stress state of the bottom soil in the five conditions is analyzed in detail, and the comparative analysis is carried out to calculate the incremental changes of the major and minor principal stresses of the soil under all conditions, and the pit bottom soil It also points out that during the process of foundation construction, the bottom soil will undergo complicated stress changing process, which will greatly affect the strength and deformation of the soil.