软土地下工程与深基坑研究进展

A review of recent advances in the underground engineering and deep excavations in soft soils

针对当前国内外软土地下工程研究现状进行系统概括和评述,重点探讨深基坑和盾构隧道两种典型地下工程涉及的关键土工问题。其一是复杂地质及环境条件下软土基坑工程的分析方法与新技术,包括基坑围护结构受力分析、基坑抗隆起稳定性分析、渗流对基坑稳定性的影响、深基坑工程中的冗余度问题、软土基坑工程的新技术;其二是软土隧道工程的稳定与变形问题,包括隧道开挖面稳定性分析、渗流对隧道开挖面稳定性的影响、隧道纵向不均匀沉降与长期沉降、隧道地震响应分析与动力模型试验;最后是软土地下工程施工的环境土工效应,包括基坑开挖引起的土体变形、隧道开挖引起的土体变形、地下工程开挖对周围环境的影响。

The status of the research on underground engineering in soft soils are reviewed. Three types of key issues in deep excavations and shield tunnelling are discussed. The first one is concerned with the new methods and technilogics for deep excavations in soft soils under complicated geological and environmental conditions, such as the stress analysis of retaining structures for foundation pits, basal stability analysis of excavations, the influence of seepage on the stability of deep excavation, the redundancy of deep excavations, and the new technique of excavations in soft soils. The second one focuses on the stability and deformation analysis of tunnel in soft soils, including the stability analysis of tunnel face, the influence of seepage on the stability, the longitudinal differential settlement and the long-term settelmcnt of tunnel, theoretical analysis and model test of the seismic response of tunnel. The last one involves the ground deformation induced by deep excavation and tunneling, and the environmental influences from underground construction.