公路隧道衬砌注浆加固力学特性研究

发布时间：2019-07-01 16:45

【摘要】：为深入研究公路隧道衬砌注浆加固的力学特性,全面评价注浆加固效果,利用PYD-50平面应变三向加载地质力学模型试验装置,针对依托工程的衬砌背后不同部位存在空洞、软弱围岩4种不同工况开展了室内模型试验,研究各工况下隧道衬砌结构应力、围岩压力等力学特性;同时,利用数值模拟手段进行分析,并将其结果与模型试验结果进行相互验证。研究结果表明:当隧道衬砌背后存在空洞、软弱围岩情况时,衬砌结构应力、围岩压力分布极不均衡,不利于隧道整体稳定;采取注浆加固措施后,衬砌结构应力最大值减小幅度达16.7%~40%,部分特征方向上围岩压力增幅达11.4%~35.5%,且二者分布更加均衡。以上分析表明,注浆加固措施有效降低了衬砌结构应力集中现象,提高了衬砌结构整体稳定性,其病害防治效果良好。
[Abstract]:In order to deeply study the mechanical characteristics of grouting reinforcement of highway tunnel lining and evaluate the effect of grouting reinforcement in an all-round way, using PYD-50 plane strain three-way loading geomechanical model test device, indoor model tests were carried out for four different working conditions, such as cavity in different parts of lining and weak surrounding rock, and the mechanical properties of tunnel lining structure stress and surrounding rock pressure under various working conditions were studied. At the same time, the numerical simulation method is used to analyze, and the results are verified with the model test results. The results show that when there are voids behind the tunnel lining and weak surrounding rock, the stress distribution of lining structure and surrounding rock pressure is very uneven, which is not conducive to the overall stability of tunnel. After grouting reinforcement measures, the maximum stress of lining structure decreases by 16.7% and 40%, and the pressure of surrounding rock increases by 11.4% and 35.5% in some characteristic directions, and the distribution of the two is more balanced. The above analysis shows that the grouting reinforcement measures can effectively reduce the stress concentration of the lining structure, improve the overall stability of the lining structure, and the disease prevention and control effect is good.
【作者单位】：长安大学公路学院;山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室;
【基金】：交通运输部应用基础研究项目(2014319771190) 山西省交通运输厅科研项目(2013-1-3;2015-1-18)
【分类号】：U455.91

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