不同围岩类别小间距隧道施工过程模拟研究  

Simulating study on construction process of tunnels with small spacing for different classes of surrounding rocks

作　　者：李云鹏[1] 王芝银[1] 韩常领[2] 霍明[2] 艾传志[1] 

机构地区：[1]中国石油大学机电工程学院,北京102249 [2]中交第一公路勘察设计院,西安710075

出　　处：《岩土力学》2006年第1期11-16,28,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.50374049)资助

摘　　要：从不同围岩类别出发,对3车道小间距隧道采用典型双侧导坑法的开挖施工过程进行了数值模拟研究。给出了不同围岩类型下的3车道小间距隧道在施工过程中的围岩破坏特征及其变形规律和变形规律的相似性,获得了洞周最大变形量值之间的相对比值关系。通过中隔墙的变形与塑性破坏规律分析,比选出了3车道隧道中隔墙最小间距的工程设计参考值。分析表明:II类围岩合理间距不应小于0.45B,III类围岩应在0.35～0.45B之间,IV,V类围岩可在0.2～0.35B之间选择,对信息化反馈施工,指出了必须重点监控与关注的位置。为小间距隧道的发展和施工设计提供了较确切的参考数据和理论依据。Based on different classes of surrounding rocks, the numerical simulation of construction process is studied for three roadway tunnels with small spacing, adopting the typical method of double side excavation. The damage characteristic and the deformation law of surrounding rocks are given in the construction process for the different classes of surrounding rocks of three driveway tunnels. The comparability of the distributive law of deformation along the tunnel boundary is indicated for different classes of surrounding rocks; and the relative ratio of maximum displacement is obtained. By comparing the deformation and the plastic damage law in the interval wall between tunnels, the minimum spacing is selected for engineering design reference in three roadway tunnels. It is shown from analysis that the reasonable spacing is more than 0.45B for surrounding rock class Ⅱ and between 0.35B and 0.45B for surrounding rock class Ⅲand between 0.20B and 0.35B for surrounding rock classification Ⅳ and Ⅴ. The key locations of measurement and control are given for the feedback information construction, and these provide the reference data and the theoretical basis for the development and construction design of highway tunnels with small spacing.

关 键 词：公路 小间距隧道 围岩类别 数值仿真 

分 类 号：TU457[建筑科学—岩土工程]