盾构模型试验研究现状及新设想

State-of-the-Art of Shield Tunnel Model Tests

针对盾构隧道模型试验研究内容分别从地层位移和应力变化、开挖面稳定性及支护压力、地层适应性三个方面进行了综述,分析了盾构隧道离心模型试验和常规物理模型试验存在的问题。在成功合成透明土的基础上,提出了有机玻璃盾构模型、光学测量和粒子图像测速(PIV)数字图像处理三部分组成的试验系统,可以用于盾构施工引起的地层移动及开挖面稳定性问题研究。

Three aspects of state of-the-art research on shield tunnel model tests are reviewed in this paper. These aspects are： displacement and stress changes in the underground strata; stability of excavated faces and pressures on the supporting struttures, and stratum adaptability of tunnel excavations. Limitations existing in the shield tunnel conventional and centrifuge mod- el tests are also discussed. Based on the success of the synthesis of a transparent soil, a new model test system is presented. This new system consists of a plexiglass shield model, an optical measurement device and a Particle Image Velocimetry （PIV）digital image processing system. The improved system can be used to study ground movements and the stability of the excava- ted faces due to the shield tunneling.