| 赵宝云*,郑颖人,刘元雪,王平.319国道重庆段裸洞隧道灰岩力学特性试验研究[J].实验力学,2015,30(4):499~505 |
| 319国道重庆段裸洞隧道灰岩力学特性试验研究 |
| Experimental Study of Limestone Mechanical Characteristics from a Bare Hole Tunnel Located in Chongqing 319 National Highway |
| 投稿时间：2014-08-16 修订日期：2014-12-13 |
| DOI：10.7520/1001-4888-14-157 |
| 中文关键词: 裸洞隧道 长期稳定性 围岩 |
| 英文关键词:bare hole tunnel long term stability surrounding rock |
| 基金项目:国家自然科学基金(41302223);重庆市基础与前沿研究计划项目(CSTC2013jcyjA90004);重庆市博士后科研项目特别资助项目(Xm2014033) |
| 作者 | 单位 | | 赵宝云* | 1.后勤工程学院土木工程系, 岩土力学与地质环境保护重庆市重点实验室, 重庆 401311
2.重庆科技学院, 建筑工程学院, 重庆 401331 | | 郑颖人 | 后勤工程学院土木工程系, 岩土力学与地质环境保护重庆市重点实验室, 重庆 401311 | | 刘元雪 | 后勤工程学院土木工程系, 岩土力学与地质环境保护重庆市重点实验室, 重庆 401311 | | 王平 | 后勤工程学院土木工程系, 岩土力学与地质环境保护重庆市重点实验室, 重庆 401311 |
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| 中文摘要: |
| 裸洞隧道在长期使用过程中,围岩遭受风化、地下水及区域地应力等不利因素的作用,导致岩体性质恶化,影响隧道的正常使用。在调研统计的基础上,选取319国道重庆至武隆段大溪河裸洞隧道为研究对象,对其表层及深层灰岩进行了室内单轴压缩、三轴压缩力学特性试验并对单轴压缩作用下的声发射特性进行了研究。结果表明：单轴压缩作用下两种岩样均出现脆性破坏特征,三轴压缩条件下,两种岩样呈压缩为主的延性扩容破坏,声发射可较好地表征岩石单轴压缩破坏过程;获得了两种岩样的基本力学参数,深层岩样强度为表层岩样强度的2.13倍,弹性模量、泊松比、内聚力、内摩擦角分别是表层岩样的1.04倍,0.63倍,1.45倍,1.37倍。研究结果可为该地区裸洞隧道的长期安全性与稳定性提供有益的理论支撑。 |
| 英文摘要: |
| In the process of long-term use, surrounding rock of bare hole tunnel is affected by a lot of unfavorable factors, such as weathering, groundwater erosion and regional stress, which lead to deterioration of rock properties and impact tunnel normal use. On the basis of investigation statistics, Daxihe bare hole tunnel located in the section from Chongqing to Wulong of 319 national highway was selected as research object. Experiments of indoor uniaxial compression, triaxial compression and acoustic emission under uniaxial compression were carried out to study the mechanical properties of its surface and deep limestone specimens, respectively. Results show that two kinds of specimen present brittle failure characteristics under uniaxial compression, while under triaxial compression, both specimens present expansion ductile failure. Acoustic emission can better characterize rock failure processes under uniaxial compression. Basic mechanical parameters of both rock samples were obtained, among which, strength of the deep limestone is 2.13imes of that of surface limestone, while elastic modulus, Poisson's ratio, cohesion and internal friction angle of the deep limestone is 1.04, 0.63, 1.45, 1.37 times of that of the surface limestone, respectively. Above results may provide beneficial theoretical support for long-term security and stability of bare hole tunnel located in that area. |
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