基于断裂理论的湿陷性黄土劈裂注浆裂纹扩展

发布时间：2018-03-31 13:46

本文选题：土木工程　切入点：湿陷性黄土　出处：《吉林大学学报(工学版)》2017年05期

【摘要】：为深入研究湿陷性黄土地区浆液在土体中的扩散机制,基于断裂力学理论,建立了一种浆液在二维平面中流动扩散的仿真分析方法。该方法对湿陷性黄土地区劈裂注浆过程中裂纹的产生形式、破坏准则的建立以及裂纹扩展的判定方法进行了描述,实现了对裂纹扩展问题及渗流-应力耦合问题的求解。同时,本文利用ABAQUS软件通过建立的裂缝扩展方程,分析了劈裂注浆压力及土体物理力学性质对裂纹扩展长度的影响。研究结果表明:劈裂注浆压力的计算应该重点考虑裂纹扩展长度和土体强度参数的影响;在黄土劈裂注浆过程中无法通过连续加压进行劈裂注浆,应分段加压,确保扩展过程中能量的聚集。最后,通过室内模型试验对裂缝扩展模拟结果进行了验证,得出试验与模型分析结论相近,验证了理论的合理性。
[Abstract]:In order to study the diffusion mechanism of slurry in soil in collapsible loess area, based on fracture mechanics theory, A simulation analysis method of slurry flow and diffusion in two-dimensional plane is established, which describes the formation of cracks, the establishment of failure criteria and the determination of crack propagation in collapsible loess area during splitting grouting. The solution of crack propagation problem and seepage stress coupling problem is realized. At the same time, the crack propagation equation established by ABAQUS software is used in this paper. The effects of splitting grouting pressure and physical and mechanical properties of soil on crack propagation length are analyzed. The results show that the influence of crack propagation length and soil strength parameters should be considered in the calculation of splitting grouting pressure. In the process of loess splitting grouting, it is impossible to carry out split grouting by continuous pressure, and should be pressed in stages to ensure the energy accumulation in the process of expansion. Finally, the simulation results of crack propagation are verified by laboratory model tests. The conclusion of the experiment and the model analysis is similar, and the rationality of the theory is verified.
【作者单位】：兰州理工大学西部土木工程防灾减灾教育部工程研究中心;兰州理工大学甘肃省土木工程防灾减灾重点实验室;兰州理工大学理学院;
【基金】：甘肃省建设科技攻关项目(JK2014-34) 国家自然科学基金项目(11472123,51468039)
【分类号】：TU472

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