广州轨道交通岩溶地质模型相似材料试验研究

Study on simulating material test of karst geological model of Guangzhou railway traffic

广州市轨道交通多条线路均穿过石灰岩分布区域,沿线地下水丰富,岩溶洞穴十分发育。为保证岩溶地区地铁隧道施工和运营安全,采用模型试验对岩溶地质环境下轨道交通的稳定性进行研究,而相似材料的选择是模型试验能否成功的关键。本文首先在对广州市轨道交通沿线岩溶地质资料进行收集和整理的基础上,采用统计分析方法,提出概化地质参数。然后根据平衡微分方程和相似原理,推导出各主要物理力学指标的相似系数。最后,应用正交试验设计法,对相似材料的配比进行了优化,得到了最佳配比。并将该配比应用于岩溶地质模型的制作,收到了很好的效果。

Limestone was under some railway line of Guangzhou with abundant underground water and developed karst caves.Model test was adopted to study stability of track transportation under circumstance of karst in order to ensure safety of subway construction and transportation.However,simulating material decided whether model test was good or not.Based on collection and sorting out the data of karst geology of Guangzhou track transportation,statistical method was used to put forward geological parameters.Then,according to equilibrium differential equation and resemblance theory,the resemblance coefficiency of main physical and mechanical index was deduced.Finally,orthogonal test was used to optimize mixing parameters of simulating material of karst geological model of Guangzhou track transportation,and the best ratio was obtained.It is good to use it for making karst geological model.