大断面矩形顶管穿越粉土黏土互层土体扰动试验研究

Experimental Study on Soil Disturbance While Large Section Rectangular Pipe Jacking Through Silt-soil Interbedded layer

城市地下空间的综合利用使得顶管技术朝着异形大断面方向发展,如何有效控制异形断面顶管施工引起土体扰动的问题已成为当前顶管施工技术重要课题。本文依托实际工程,综合探讨了大断面、高水位矩形顶管在粉土、黏土互层地质条件顶进过程中引起的一系列土体位移与孔隙水压力的变化,并依据得到的变化规律,分析得到大断面矩形顶管施工引起土体扰动划分准则,揭示施工过程中土体的一般扰动规律,为类似工程提供参考与借鉴。

The integrated use of underground space makes the pipe jacking technology towards the development of large-size cross-section. How to effectively control the soil disturbance caused by the large-size pipe jacking construction has become one of the important issues of pipe jacking construction technology development. Relying on practical engineering, this paper talks about the change of soil displacement and pore water pressure in silty and clay stratum caused by large cross section and high water level rectangular pipe jacking. According to the law of change, the criterion of soil disturbance caused by the construction of large section rectangular pipe jacking is analyzed, and the general disturbance law of soil is revealed in the construction process. It could provide reference for similar projects.