盾构施工对周围土体扰动的室内试验分析

Indoor Test Analysis of the Surrounding Soil Disturbance Caused by Shield Construction

随着地铁建设的发展,盾构工程的应用以及由此引发的环境问题也越来越普遍。上海地铁隧道基本全部采用盾构修建,由于天然地质条件的影响,使得上海地区土层更易于受到盾构施工工程的影响。文章针对上海地区盾构施工遇到的典型土质(5)层粉质粘土,利用GDS应力路径三轴仪对其在不同应力路径条件下产生的变形和强度影响进行深入地研究,通过一整套加载、卸载试验方案,以研究相应应力路径下的孔压变化、应力-应变关系曲线等,结果表明:在实际工程设计中,对土体的参数取值,必须考虑土的应力路径变化。

With the development of subway construction,the application of shield construction as well as the environment problem caused by it has being increasingly common,Shanghai subway tunnel are mostly made of tunnel shield construction,because of the influence of the natural geological conditions,the soil layer in Shanghai are more vulnerable to the influence of shield construction engineering.This paper is based on the typical soil-the silty clay of(5) layer in shield construction of Shanghai,Using GDS stress path triaxial apparatus,the deformation and strength were further study under the influence of different stress path,a set of loading and unloading test plan were maded in order to study the corresponding pore pressure change under the stress path,stress-strain relationship curve,etc.,the results showed that:during the practical engineering design,the stress path of soil changes must be considered in order to select parameter of soil.