摘要
龙潭隧道位于沪蓉国道主干线湖北长阳白氏坪—恩施段上,长8 600 m,最大埋深530 m,属国内第二长公路隧道。隧道穿越岩溶、断层、裂隙发育地段,受构造运动影响,围岩内赋存的水平地应力偏高,沿途地质条件复杂,是典型复杂地质条件下的深埋特长隧道。为研究施工期隧道围岩的稳定情况,进行大量现场监控量测。通过对监测数据的分析,研究围岩位移、锚杆轴力、二衬接触压力的分布特性及其变化规律,研究结果可为隧道后续施工和设计方案优化调整提供依据,也可为类似复杂条件下深埋特长隧道的设计、施工提供参考。
Longtan tunnel is located on the section from Baishiping Town to Enshi City, Hubei Province, of Hurong(Shanghai-Chengdu) highway. It is about 8.6 kilometers long, the second longest highway tunnel in China, and its depth is about 530 meters. It is designed to penetrate the strata consisting of developed karst caverns, faults, and fractures caused by tectogenesis. So the initial stress in the surrounding rock is high; and the geological conditions along the tunnel are very complicated. It is a very typical deep and extra long tunnel under complicated geological conditions. To study the stability of this tunnel, many in-situ measurements on the surrounding rock have been taken. Through the in-situ measurement, the distribution characteristics of the internal displacements, the bolt axial force and the contact pressure between lining and surrounding rock are studied. And the influencing factors are analyzed in detail. Based on the analyses of the measurement, some useful conclusions are drawn to the stability of the tunnel; and some suggestions are made to modify and optimize design and construction scheme. This study will offer some useful references for construction of tunnels in the similar geological conditions.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第10期1982-1990,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
交通部西部交通建设科技项目"沪蓉国道主干线龙潭特长隧道特殊地质条件下的关键技术研究"(200431800028)
国家自然科学基金重点项目(90510019)
关键词
隧道工程
高地应力
岩溶地质条件
深埋特长隧道
现场监测
稳定性研究
Engineering geology
Highway engineering
Measurements
Monitoring
Rock bolting
Rock mechanics
Stability
Stresses
Tunnel linings
