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黄土地层土压平衡盾构动态施工过程研究
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摘要
我国在黄土地区盾构法修建地铁隧道尚属首次,因此研究盾构施工过程中引起的土体位移情况,对今后西安地铁的合理设计和施工都有一定的参考价值和一定的现实意义。
     以西安地铁黄土地层盾构区间隧道为具体研究对象,采用模型试验和数值模拟手段,组织实施了能对土压平衡盾构动态施工过程进行全程模拟的试验,探讨在盾构推进过程中,黄土地层位移的三维变化规律。论文主要工作如下:
     1、从盾构施工对黄土地层的扰动本质即土体的扰动出发,对扰动机理进行了分析;再从施工扰动引起的地层的宏观位移这一结果出发,分析了施工力学效应、施工几何效应引起的地层位移的计算方法;
     2、对反映盾构—地层系统特性的相关参量进行分析,合理地选择了对实验结果影响显著的参量。利用自行研制的模型盾构机对盾构隧道在黄土地层条件下施工的动态过程进行室内模拟试验。
     3、对模型试验的地层位移进行分析,得出了黄土地层位移在盾构动态施工过程中的一般规律;利用三维数值模拟方法对黄土地层中盾构的动态施工过程进行了全程模拟,对黄土地层中盾构法施工过程中引起的地层位移和地面沉降规律进行了研究。
It is the first time that shield tunnels have built in the loess ground in China. So it is valuable and practical for XiAn tunnel's construction in the future to study the soil sedimentations.
     Based on the twin shield tunnel of the XiAn Metro, laboratorial model test and numerical simulation are used to simulate the dynamic construction process with Earth Pressure Balance Shield Machine, research the change laws of the ground displacement in the parallel tunnels during the dynamic shield construction process. The main work of my thesis is as follows:
     1、Based on the truth that the disturbance of the shield construction to the ground is essentially the disturbance of the loess, the sources of the disturbance has been analyzed; At last the computational method of the mechanical effect、the geometrical effect and the secondary consolidation effect of the soils was put forward.
     2、The parameter which can show the characteristic of the shield-ground system was analyzed, and then the parameter which can evidently influence the result of the test was chosen.
     3、The universal laws of the ground displacement during the dynamic shield construction process was got by analyzing the data of the model test; The dynamic construction process in loess ground was simulated by three-dimensional numerical simulation.And the change laws of the ground displacement during the dynamic shield construction process in loess ground was researched.
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