砂性土中隧道施工引起地层沉降分布特征的模型试验研究

发布时间：2018-11-24 11:15

【摘要】：目前关于隧道施工引起的地层位移的研究主要集中在地面沉降上,而在隧道施工过程中逐渐增多的地下建(构)物破坏案例使得准确预测地层中位移模式的重要性日益凸显。针对这一问题,利用自制的大型模型试验箱,以长江砂为填料,用调整模型箱底板各分块不同高度的方式来模拟隧道施工引起的地层位移。通过对不同深度处地层位移模式的分析,研究了砂性土中隧道施工引起的地层沉降分布特征。试验结果表明:某一深度处中心最大沉降量与观测深度及底板最大下沉量之间近似呈线性关系;沉降槽的体积不是常数,而是随深度的增加逐渐增大的变量,地面沉降槽的体积仅相当于地层损失体积的一半;沉降槽宽度系数i只与沉降槽所处深度有关而与该沉降槽的中心最大沉降量无关。
[Abstract]:At present, the research on the ground displacement caused by tunnel construction is mainly focused on the ground subsidence, but in the tunnel construction process, the increasing number of underground construction (structure) damage cases make the accurate prediction of displacement model in the stratum more and more important. In order to solve this problem, the formation displacement caused by tunnel construction is simulated by using the self-made large model test box and the Yangtze River sand as the filler, and adjusting the different height of the bottom plate of the model box to simulate the formation displacement caused by the tunnel construction. Based on the analysis of strata displacement models at different depths, the distribution characteristics of stratum settlement caused by tunnel construction in sandy soil are studied. The experimental results show that there is an approximate linear relationship between the maximum settlement of the center at a certain depth and the observed depth and the maximum subsidence of the bottom plate. The volume of the subsidence trough is not a constant, but a variable gradually increasing with the increase of depth. The volume of the subsidence trough is only half of the lost volume of the formation. The width coefficient I is only related to the depth of the channel, but not to the maximum settlement in the center of the channel.
【作者单位】：东南大学岩土工程研究所;
【基金】：国家自然科学基金青年基金项目(51108078) 同济大学岩土及地下工程教育部重点实验室开发基金(KLE-TJGE-B1102) 江苏省自然科学基金项目(BK2013294)
【分类号】：U455

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