| 平面P波入射下浅埋平行双洞隧道注浆加固减震机制 |
| |
| 引用本文： | 王帅帅,高波,范凯祥,申玉生,张涛.平面P波入射下浅埋平行双洞隧道注浆加固减震机制[J].岩土力学,2018,39(2):683-690. |
| |
| 作者姓名： | 王帅帅 高波 范凯祥 申玉生 张涛 |
| |
| 作者单位： | 1. 西南交通大学 交通隧道工程教育部重点实验室，四川 成都 610031；2. 中交第二公路工程局有限公司，陕西 西安 710065 |
| |
| 基金项目： | “十三五”国家重点研发计划（No. 2016YFB1200401）；国家自然科学基金项目（No. 51678501，No. 51778540，No.51778539，No. 51178398）。 |
| |
| 摘 要： | 地震动作用下小净距隧道双洞之间存在动力放大效应，依托某强震区小净距盾构隧道工程，基于傅里叶贝塞尔级数展开法，给出了平面P波垂直入射下地下半空间弹性介质中圆形双洞复合式衬砌洞室动应力解析解，深入研究了洞室间距、隧道全环注浆加固参数对衬砌动应力集中的影响。研究表明：洞室间距对衬砌的动应力有显著影响，随着洞室之间距离减小，左右洞室衬砌动应力明显放大；2.5倍洞径可以作为双洞洞室动力临界净距，当洞室间距小于2.5倍洞径时，应进行抗减震设计；注浆全环加固隧道周边土体，可以明显降低衬砌动应力，随着注浆加固区土体刚度增加，衬砌动应力幅值减小；结合工程实际，建议注浆加固区厚度取0.5倍的洞室半径值，加固区岩体和围岩剪切波速度之比取1.2。
|
| 关 键 词： | 平面P波 小净距隧道 注浆加固 减震机制 动应力集中系数 |
| 收稿时间： | 2016-03-17 |
Damping mechanism of shallow cylindrical parallel tunnel with grouting reinforcement zone |
| |
| WANG Shuai-shuai,GAO Bo,FAN Kai-xiang,SHEN Yu-sheng,ZHANG Tao.Damping mechanism of shallow cylindrical parallel tunnel with grouting reinforcement zone[J].Rock and Soil Mechanics,2018,39(2):683-690. |
| |
| Authors: | WANG Shuai-shuai GAO Bo FAN Kai-xiang SHEN Yu-sheng ZHANG Tao |
| |
| Institution: | 1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. CCCC Second Highway Engineering Co., Ltd., Xi’an, Shaanxi 710065, China |
| |
| Abstract: | The parallel small clear-distance tunnels have obvious dynamic amplification effect under earthquake loading. Small neighbourhood shield tunnels in the strong earthquake region were selected to investigate the dynamic response of shallow-buried parallel small clear-distance tunnels. A series of dynamic stress solutions was deducted for shallow-buried composite lined tunnels subjected to vertically propagating incident P waves using the Fourier-Bessel expansion method. Moreover, we discussed the influence of the distance between two tunnels and the grouting reinforcement zone on dynamic stress of tunnels. The results show that the distance between tunnels plays a vital role on the dynamic stress response of tunnels, and dynamic stress concentration factors of linings increase obviously as decreasing the distance of tunnels. The critical distance between the centres of two circular tunnels is proposed as 2.5 times diameter. The aseismic and damping design should also be suggested when the distance is below the critical value. The dynamic stress of linings decreases with grouting reinforcement ring zone set outside around tunnels, and the dynamic stress of linings decreases with increasing the stiffness of the grouting zone. The optimal ratio of shear wave velocity of the grouting zone to that of surrounding rock is suggested as 1.2. The recommended ratio of the thickness of the grouting zone to the tunnel radius is 0.5. |
| |
| Keywords: | plane P waves small clear-distance tunnels grouting reinforcement zone damping mechanism dynamic stress concentration factor |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
