| 基于能量法的连拱隧道钻爆施工对围岩损伤影响分析 |
| |
| 引用本文： | 何忠明,蔡军,黄阜,刘雅欣.基于能量法的连拱隧道钻爆施工对围岩损伤影响分析[J].中国公路学报,2019,32(9):143. |
| |
| 作者姓名： | 何忠明 蔡军 黄阜 刘雅欣 |
| |
| 作者单位： | 1. 长沙理工大学 交通运输工程学院, 湖南 长沙 410114;2. 贺州学院 建筑工程学院, 广西 贺州 542899;3. 长沙理工大学 土木工程学院, 湖南 长沙 410114 |
| |
| 基金项目： | 国家自然科学基金项目（51678073） |
| |
| 摘 要： | 以采用无导洞钻爆法施工的云南省武定至易门高速公路三台坡连拱隧道工程为依托，针对爆破施工对无导洞连拱隧道围岩造成损伤的问题，利用能量衰减公式推导隧道围岩振动速度衰减公式；采用FLAC3D软件计算分析实际工程围岩振动速度以验证理论推导公式的准确性，并计算分析在爆破荷载作用下连拱隧道围岩、中墙的振动速度和振动位移的变化规律。研究结果表明：振动速度的理论计算结果和数值模拟结果之间的相对误差较小，说明基于理论推导得到的隧道围岩振动速度计算公式是可靠的；爆破过程中产生的能量以地震波的形式向外传播，当地震波传至地表仍未完全衰减时，未完全衰减的能量将以反射波的形式继续衰减；爆破施工过程中围岩振动速度和振动位移最大值均位于距掌子面6 m的已开挖区隧道拱顶围岩处，未支护情况下隧道拱顶8 m范围的围岩振动速度大于63.5 cm·s-1，围岩处于损伤的状态，因此在爆破施工过程中应对已开挖区围岩进行预加固。
|
| 关 键 词： | 隧道工程 围岩损伤 数值模拟 振动速度 |
| 收稿时间： | 2018-10-15 |
Analysis of Influence of Drilling and Blasting Construction on Surrounding Rock Damage of Multi-arch Tunnel Based on Energy Method |
| |
| HE Zhong-ming,CAI Jun,HUANG Fu,LIU Ya-xin.Analysis of Influence of Drilling and Blasting Construction on Surrounding Rock Damage of Multi-arch Tunnel Based on Energy Method[J].China Journal of Highway and Transport,2019,32(9):143. |
| |
| Authors: | HE Zhong-ming CAI Jun HUANG Fu LIU Ya-xin |
| |
| Affiliation: | 1. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China;2. School of Architectural Engineering, Hezhou University, Hezhou 542899, Guangxi, China;3. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China |
| |
| Abstract: | The aim of this study was to address the problem of surrounding rock damage caused by blasting construction in a multi-arch tunnel without an advancing middle drift, based on the drilling and blasting construction of the Santaipo multi-arch tunnel without middle drifts at the Wu-ding to Yi-men Expressway in Yunnan Province. The attenuation formula of vibration velocity was derived by applying the attenuation formula of blasting energy. The results of the derivation formula were compared with those of a numerical simulation using FLAC3D software. The variation rule of vibration velocity and displacement at the joint of the tunnel surrounding rock and multi-arch tunnel during the blasting construction were analyzed. The results of the study indicate the following:The relative error between the results of theoretical calculation and numerical simulation of vibration velocity is small, which indicates that the formula for calculating the vibration velocity of the tunnel surrounding rock based on theoretical deduction is reliable; During blasting, energy propagates outward in the form of seismic waves; if a seismic wave arrives at the surface and is not fully attenuated, the energy will continue to attenuate in the form of reflected waves; During blasting construction, the maximum vibration velocity and displacement of surrounding rock are located in the surrounding rock of the arch roof of the excavated tunnel within 6 m from the face of the tunnel. Without supporting the tunnel, the vibration velocity of surrounding rock in the 8-m range of the tunnel vault is greater than 63.5 cm·s-1, which indicates damage. Therefore, it should be pre-reinforced before blasting construction. |
| |
| Keywords: | tunnel engineering damage of surrounding rock numerical simulation vibration velocity |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国公路学报》浏览原始摘要信息 |
|
点击此处可从《中国公路学报》下载全文 |
|
