砂土地层盾构法施工的地层适应性模型试验研究

MODEL EXPERIMENTAL STUDY ON STRATUM ADAPTABILITY OF TUNNEL EXCAVATION WITH EPB SHIELD MACHINE IN SANDY STRATUM

随着地下空间开发需求的持续高涨,盾构工法已越来越成为一种主要的施工方法。但是由于各地区土层特性的差异,反映在盾构机工作参数的变化上也不尽相同,所以,很有必要开展盾构机工作参数针对特定地层的适应性研究。为此,以上海地区的粉砂地层为参照原型,将相似理论和模型试验的方法成功地应用于盾构模型试验方案的设计;在此基础上,进行了不同地层条件下,盾构机不同工作参数组合的掘削试验,并通过对试验结果的分析,得出了一些有益的结论,从而能更好地为盾构适应土层性质服务。

With the technology center of Shanghai Tunnel Engineering Construction Co.Ltd.,development and utilization of underground space,the shield-tunneling method is used wildly as an important construction method.However,due to the regional difference of stratum properties,the working parameters of shield machine will vary in different ways.To better understand the interrelation between the machine working parameters and the variation characteristic of stratum,it is necessary to conduct the model experimental research on shield machine′s working parameters applicable to stratum property.Therefore,the silty sand stratum in Shanghai area is taken as prototype,then the similitude theory and model test method have been applied successfully to the design of a special test scheme.Subsequentlyi,n different types of ground,various working parameters of shield machine are combined to test.Based on the test results,some useful relationships can be deduced,which will provide good adaptability of shield machine to different strata.