曲线顶管的三维力学模型理论分析与应用

大口径急曲线顶管施工技术已经在上海地区得到成功的应用,但曲线顶管施工对周围土体稳定性影响和管体结构受力、位移的空间变化有待深入研究和探讨。本文试图从经典弹性力学基本原理出发,利用壳体理论和温克尔假设建立曲线顶管与土体相互作用的三维力学模型,以模拟曲线顶管在软土地层中的施工力学性态。给出了曲线顶管纵向和法向位移的理论解,并进而给出了结构的内力和地层抗力。与具体工程实测位移比较表明,位移的理论解和实测值有相当的一致性,本文的理论结果是合理的。

Theoretical analysis of three-dimensional mechanical model of curved pipe jacking and its application

The large diameter and curved pipe jacking technique has applied successfully in soft soil of Shanghai, but it is required to study and discuss the effect of curved pipe jacking construction on the surrounding soft ground and the internal forces and deformations of pipe.Based on the classic elastic theory,the three dimensional mechanical model of interaction between curved pipe and soil ground is established using thin shell theory and Winkler’s assumption,to simulate the mechanical behavior of construction of pipe jacking in soft soil. The theoretical solutions of longitudinal and transverse deformations along curved pipe axis are given, and thus the internal forces of pipe and the ground resistance are also deduced. It is shown by comparison between the theoretical and measured values that the theoretical result is reasonable. 