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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。
Split grouting can effectively improve the deformation parameters of soils and greatly reduce the deformation of soils when the stress state changes. It is very important to study the equivalent deformation parameters of composite soils after splitting grouting. On the basis of comprehensively analyzing the actuality of split grouting diffusion mechanism and engineering application, a three-dimensional geometric model of composite soil after splitting grouting is proposed based on the homogenization theory. According to the equivalent principle, And stress distribution model. Then based on the transverse isotropic constitutive relationship, the equivalent elastic modulus of the model and the analytic solution of the equivalent Poisson’s ratio are deduced. Then, the equivalent elastic modulus and equivalent Poisson’s ratio under the model-specific conditions were obtained by the finite element method, and compared with the analytical results. Finally, the model and the corresponding analytical results are introduced into Flac ~ (3D) geotechnical engineering analysis software, and a thermal tunneling project is used to predict the settlement of the key position after the tunnel split grouting, and compared with the measured data. The results show that the calculated results are in good agreement with the calculated results of the finite element method, which shows the correctness of the analytical results. Based on the model and its analytical results, the predicted settlement values after the tunnel excavation and the measured The value has a good consistency, indicating that the proposed model and the corresponding analytical methods have certain reliability and practicality.