基于仿真分析的软岩隧道喷层厚度优化探讨  

Probe into Optimization of Spray Layer Thickness of Soft-rock Tunnels Based on Simulation Analysis

作　　者：赵旭峰[1] 宋洋[2] 赵玉东[2] 

机构地区：[1]中国国际工程咨询公司,北京100048 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《公路交通技术》2014年第4期110-115,共6页Technology of Highway and Transport

基　　金：国家重点基础研究发展计划(973计划)项目(2010CB732105);国家科技支撑计划项目(2012BAG05B03);国家自然科学基金项目(51378434)

摘　　要：以西部某千枚岩软岩隧道为工程背景,采用三维有限元数值模拟手段对不同喷层厚度条件下围岩的洞周位移、喷层混凝土内力进行对比分析,对其随喷层厚度增加的变化规律进行研究。结果表明:喷射混凝土厚度的大小对软岩隧道围岩变形的控制作用不明显;喷层厚度的大小对下台阶开挖后的内力影响显著;喷射混凝土厚度对围岩变形控制具有一定作用,但仅限于一定厚度范围内,当喷层厚度超过一定量值后,喷层对于围岩变形控制效果将不再明显,但其对喷层内力的影响却更加显著。With some phyllite soft-rock tunnel in the west as project background, this paper comparatively analyzes convergence displacement of wall rock and inner force of spray layer concrete under the condition of different spray layer thicknesses by mean of 3 D finite element numerical simulation method and studies the change laws of them with increase of spray layer thickness. The results show that the control effect of the thickness of sprayed concrete on wall rock deformation of soft-rock tunnels is not obvious; the thickness of spray layer remarkably affects the inner force after excavation of lower bench;the thickness of sprayed concrete has a certain effect on control of wall rock deformation, but is only limited to a certain thickness range, as the thickness of spray layer is over a certain value, the control effect of spray layer on wall rock deformation will not be obvious any longer, however it influence on inner force of spray layer is more remarkable.

关 键 词：隧道工程 有限元数值模拟 软岩隧道 喷层厚度 优化分析 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]