文档介绍：摘要
随着我国西部大开发战略的实施,高等级的公路得到了迅猛发展。与此同时,在高速公路建设中包含大量的黄土隧道。由于黄土公路隧道洞室开挖断面大、地质条件复杂、施工难度高、附属设施多,因此在隧道工程的建设过程中出现了诸多问题。本文基于黄土力学参数,运用岩土工程数值分析软件Midas GTS,进行黄土地层地下隧道开挖对周围土体变形影响的计算机模拟分析。根据黄土场地的实际条件,建立了隧道的计算模型,利用Midas GTS程序,模拟了黄土隧道开挖过程中前期支护条件、后期加固措施等因素对隧道内部地表、拱顶、侧墙以及地上建筑物沉降的影响程度和塑性区、位移的分布规律。仿真黄土隧道开挖数值模拟,以及开挖过程对周围土层的影响,可为黄土地区的地下工程建设提供一定的参考。
关键词:黄土隧道, 数值模拟, Midas GTS
Abstract
With the implementation of the strategy of western development in our country, high-grade highway got rapid development. At the same time,contains a large number of loess tunnel in expressway construction. Due to the loess highway tunnel cavern excavation section of plex geological conditions,construction difficulty is high,the ancillary facilities,more so in tunnel engineering construction problems appeared in the process. Based on loess mechanics parameters,by use of numerical analysis of geotechnical engineering software Midas GTS,loess stratum underground tunnel excavation on the surrounding soil mass deformation impact analysis of puter simulation. According to the actual condition of the loess field,established the calculation model of the tunnel,using Midas GTS procedure,loess tunnel excavation are simulated by the early supporting conditions,later in the process of reinforcement measures on the tunnel internal surface,the influence degree of the side wall and the ground settlement of buildings and the plastic zone,displacement distribution. Loess tunnel excavation simulation numerical simulation,and the influence of excavation process on the surrounding soil,for underground engineering construction in loess regions provide certain reference.
Key words: loess tunnel, the numerical simulation, Midas GTS
目录
1 绪论 1
黄土的特性 1
黄土的成分组成 1
黄土的分类 1
黄土的特性 2
黄土隧道建设历史 3
铁路黄土隧道的建设历史 3
公路黄土隧道建设历史 4
黄土隧道建设技术问题 4
大断面黄土隧道的工程特性和变形性机理问题 5
适用于黄土隧道的支护结构问题 5
黄土隧道地表沉降控制和地表裂缝技术问题 5
黄土隧道拱脚稳定性问题 5
湿陷性黄土隧道地基处理技术问题 5
隧道开挖方法的选择 6