劈裂注浆复合土体三维等效弹性模型理论研究

发布时间：2018-05-31 05:25

本文选题：劈裂注浆 + 复合土体　；参考：《岩土力学》2016年07期

【摘要】：劈裂注浆可以有效改善土体的变形参数,大大降低土体在受力状态改变时的变形量,对劈裂注浆后复合土体的等效变形参数进行研究十分重要。在综合分析劈裂注浆扩散机制和工程应用实际的基础上,基于均质化理论提出了劈裂注浆后复合土体的三维单元体几何模型,按等效原则给出了浆-土体积及受力分配关系模型图;接着基于横向各向同性本构关系推导了模型的等效弹性模量和等效泊松比的解析解。然后采用有限元方法取得了模型特定条件下的等效弹性模量和等效泊松比,并与解析结果进行对比分析。最后把模型和相应的解析结果引入Flac~(3D)岩土工程专业分析软件,结合一个热力隧道工程实例对隧道劈裂注浆后关键位置的沉降进行预测分析,并与实测值进行了对比。研究表明:对所提出的计算模型,解析计算与有限元方法计算结果吻合度较高,说明了解析结果的正确性;基于该模型及其解析结果得到的隧道开挖后的沉降预测值与实测值具有良好的一致性,说明所提出的模型和相应的解析计算方法具有一定的可靠性和实用性。
[Abstract]:Splitting grouting can effectively improve the deformation parameters of soil and greatly reduce the deformation of soil when the stress state changes. It is very important to study the equivalent deformation parameters of composite soil after splitting grouting. Based on the comprehensive analysis of split grouting diffusion mechanism and engineering application, a three-dimensional element geometry model of split grouting composite soil is proposed based on homogenization theory. According to the principle of equivalence, the model diagram of the relationship between slurry and soil volume and force distribution is given, and the analytical solutions of the equivalent elastic modulus and equivalent Poisson's ratio are derived based on the transversely isotropic constitutive relation. Then the equivalent elastic modulus and equivalent Poisson's ratio are obtained by using the finite element method under the specific conditions of the model, and the results are compared with the analytical results. Finally, the model and the corresponding analytical results are introduced into the professional analysis software of geotechnical engineering. Combined with an example of thermal tunnel engineering, the settlement of the critical position after splitting grouting in the tunnel is predicted and analyzed, and compared with the measured values. The results show that the analytical results are in good agreement with the results of the finite element method, which shows the correctness of the analytical results. The predicted settlement value of tunnel excavation based on the model and its analytical results is in good agreement with the measured value, which shows that the proposed model and the corresponding analytical calculation method are reliable and practical.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：北京市2013年度重点科技研究项目(No.C13L00010) 甘肃省2014年度科技研究与开发项目(No.C14L01060) 铁道部重点项目(No.C10L00650)~~
【分类号】：TU41

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