| 大断面黄土隧道开挖引起的围岩力学响应 |
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| 引用本文： | 扈世民,张顶立,王梦恕.大断面黄土隧道开挖引起的围岩力学响应[J].中国铁道科学,2011,32(5). |
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| 作者姓名： | 扈世民 张顶立 王梦恕 |
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| 作者单位： | 北京交通大学隧道及地下工程实验研究中心,北京,100044 |
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| 基金项目： | 铁道部科技研究开发计划项目(2009G005-B) |
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| 摘 要： | 以胡麻岭隧道为工程背景,采用现场监测与三维数值模拟结合的方法,分析隧道开挖后黄土围岩应力场、位移场与塑性区的变化规律；同时对台阶法施工中影响围岩力学响应的因素进行分析.结果表明:围岩接触压力分布很不均匀；拱腰、墙角和边墙是施工过程中的薄弱环节,应加强支护刚度,设置锁脚锚杆或扩大拱脚；建议取消拱部系统锚杆,既有利于控制围岩变形又可减少工程投资；支护结构调整了围岩应力的分配,改善了应力集中且控制了塑性区的发展,故应坚持“及时支护、及早封闭成环”的原则；上台阶支护对控制拱顶沉降起着关键作用,施工中应引起足够重视；拱顶沉降在变形允许范围内,说明现行支护设计参数满足安全性要求；掌子面空间效应的影响范围约为其前方2～3倍洞径；数值计算结果与现场实测结果基本吻合.
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| 关 键 词： | 大断面隧道 黄土隧道 围岩应力场 位移场 塑性区 台阶法 |
The Mechanical Response of the Surrounding Rock Caused by the Excavation of Loess Tunnel with Large Cross Section |
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| HU Shimin,ZHANG Dingli,WANG Mengshu.The Mechanical Response of the Surrounding Rock Caused by the Excavation of Loess Tunnel with Large Cross Section[J].China Railway Science,2011,32(5). |
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| Authors: | HU Shimin ZHANG Dingli WANG Mengshu |
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| Institution: | HU Shimin,ZHANG Dingli,WANG Mengshu(Tunnel and Underground Engineering Experimental Research Center,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | Taking Humaling tunnel as the engineering background,site monitoring together with 3D numerical simulations were adopted to analyze the variations of the stress field,displacement field and plastic field of the surrounding rock in loess after tunnel excavation.Meanwhile the factors affecting the mechanical response of surrounding rock were studied during the bench method construction.Results show that the contact pressure of the surrounding rock is rather unevenly distributed.The haunch,wall corner and side... |
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| Keywords: | Large cross-section tunnel Loess tunnel Stress field of surrounding rock Displacement field Plastic zone Bench method |
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