宁波轨道交通工程中的岩土特性及变形规律

Geotechnical Behavior and Defromation in Ningbo Urban Rail Transit Project

轨道交通工程是一项建设规模大、工期长、投资多、社会效益倍受关注的民生工程。宁波轨道交通地下结构主要位于软土地层中,沿线地上穿越多个繁华商业区,地下管线密集,施工引起的环境岩土工程问题直接影响轨道交通的安全。为此,本文基于宁波轨道交通1、2号线一期工程,结合车站基坑、区间盾构隧道设计、施工和监测技术,从工程地质和水文地质条件、基坑加固和降水、基坑对周边环境影响、盾构区间变形监测及地表沉降特性等方面阐述了宁波轨道交通工程车站基坑和盾构区间的岩土工程特性及变形规律,分析了问题产生的原因和影响因素。

Ningbo urban rail transit project construction is a large scale, long period of construction, heavy investment and social effect widely concerned engineering. The stratum where the urban rail transit project pass through is mainly composed by the soft clay, and several crowded downtown area is cut across along the line among which there are concentrated pipelines. Therefore, the construction safety is required to be a high level and the environmental geotechnical engineering problems during the construction is the important component of the risk urban rail transit project construction. In this paper, the design, construction and monitoring of foundation excavation and shield tunnel in the first-stage project of line 1 and 2 in Ningbo urban rail transit are taken as example to discuss such geoteehnieal engineering problems as engineering geology and hydrogeololgy, reinforeement and dewater in foundation excavation, effect excavation on surrounding environment, deformation and settlement monitoring in shield tunnel, and so on, in foundation excavation and shield tunnel. The ,~ason and influence are analyzed.