川藏铁路某超深埋隧道地应力特征及岩爆分析

发布时间：2018-04-29 09:01

本文选题：超深埋隧道 + 应力特征　；参考：《铁道工程学报》2017年04期

【摘要】：研究目的:超深埋折多山隧道是川藏铁路雅康段控制性工程,隧址位于我国西部新构造运动活跃的"Y"字形构造带核心区域,其地应力特征及岩爆预测对铁路选线、设计和施工具有重要意义。本文通过地应力测试数据,数值模拟来分析折多山隧道隧址区及洞身的应力分布特征,明确最大主应力的方向,并利用岩石的单轴加卸、载应力-应变曲线计算其隧道围岩的岩爆倾向指数,分析发生岩爆的岩石力学指标,结合深孔钻探成果、岩石力学试验、水文试验成果来综合分析川藏铁路折多山隧道发生岩爆的强度。研究结论:(1)川藏铁路折多山隧道最大主应力为水平应力,方向为NEE向,实测地应力最大值为17 MPa,数值模拟洞身最大值可达到48 MPa;(2)通过岩爆倾向性指数试验分析可知,围岩具备发生中等~强烈岩爆的储能和释能条件;(3)通过综合分析可知,折多山隧道易发生中等~强烈岩爆;(4)该研究结论可为隧道设计提供依据,也可为邻近区域隧道围岩稳定性判断提供借鉴。
[Abstract]:Objective: the ultra-deep buried folding mountain tunnel is a control project in Yakang section of Sichuan-Tibet railway. The tunnel is located in the core area of the "Y" zigzag structural belt with active neotectonic movement in the west of China. The geostress characteristics and rockburst prediction are used to select the railway line. Design and construction are of great significance. In this paper, the stress distribution characteristics of the tunnel site and the tunnel body are analyzed by means of the in-situ stress test data and numerical simulation, the direction of the maximum principal stress is determined, and the uniaxial unloading of the rock is used. The stress-strain curve is used to calculate the rock burst tendency index of the surrounding rock of the tunnel, and the rock mechanics index of the rock burst is analyzed. Combined with the results of deep hole drilling, the rock mechanics test is carried out. The results of hydrological test are used to analyze the strength of rockburst in Chuan-Tibet railway tunnel. It is concluded that the maximum principal stress of Chuan-Tibet Railway is horizontal stress, the direction is NEE, the measured maximum of in-situ stress is 17 MPA, and the maximum value of numerical simulation of tunnel body can reach 48 MPA / 2) through the analysis of rockburst propensity index test, it can be concluded that the maximum principal stress is horizontal stress, the direction is in NEE direction, and the measured maximum is 17 MPA. By comprehensive analysis, it can be concluded that the medium to strong rockburst is easy to occur in the Zhuandooshan tunnel) the research conclusion can provide the basis for the tunnel design. It can also be used for reference to judge the surrounding rock stability of adjacent tunnel.
【作者单位】：成都理工大学;中铁二院工程地质创新工作室;
【分类号】：U451

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