采用动力强度折减法对水工隧洞进行了地震作用下稳定性数值计算分析,并进行了振动台模型试验,模拟了地震对隧洞的作用,得到了和数值计算一致的结果,对其进行了对比验证。结果表明隧洞的破坏是一个渐变过程,首先在薄弱部位形成破裂区,逐渐扩大,直至破裂区贯通破坏;不同埋深隧洞在地震中的破坏形式不同,浅埋隧洞在其上方形成贯通到地面的破裂区,深埋隧洞在其周围形成贯通的破裂区,并不延伸到地面;隧洞的洞径对隧洞的动力稳定性影响较大,洞径增大1倍,安全系数降低45%左右。
Abstract
Dynamic strength reduction method was used in the seismic stability numerical analysis for hydraulic tunnel. Shaking table test modelling the effect of earthquake on tunnel was conducted to verify the result of numerical analysis. The test result were consistent with that of the numerical analysis. The results suggest that the destruction of the tunnel is a gradual process. First, damage zone appears at weak parts and then gradually expands until it penetrates through. The seismic failure modes are different when the tunnel depth is different: for shallow tunnel, the damage zone forms above the tunnel and penetrates to the ground; whereas for deep tunnel, the damage zone forms around the tunnel, and does not extend to the ground. Tunnel diameter has great impact on the dynamic stability of the tunnel. As the tunnel diameter doubles, the safety factor reduces by about 45%.
关键词
水工隧洞 /
动力强度折减法 /
地震 /
埋深 /
振动台模型试验
Key words
hydraulic tunnel /
dynamic strength reduction method /
earthquake /
depth /
shaking table test
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] SL279—2002, 水工隧洞设计规范 . 北京: 中国水利水电出版社,2002. (SL279—2002, Specification for Design of Hydraulic Tunnel. Beijing: China Water Power Press, 2002. (in Chinese))
GRIFFITH S D V, LANE P A. Slope Stability Analysis by Finite Elements. Geotechnique, 1999, 49(3): 387-403.
邱陈瑜,郑颖人,宋雅坤.采用 ANSYS 软件讨论无衬砌黄土隧洞安全系数.地下空间与工程学报,2009, 5(2): 291-296. (QIU Chen-yu, ZHENG Ying-ren, SONG Ya-kun. Exploring the Safety Factors of Unlined Loess Tunnel by ANSYS. Chinese Journal of Underground Space and Engineering, 2009, 5(2): 291-296. (in Chinese))
张 红,郑颖人,杨 臻,等.黄土隧洞安全系数初探. 地下空间与工程学报, 2009, 5(2): 297－306. (ZHANG Hong, ZHENG Ying-ren, YANG Zhen, et al. Exploration of Safety Factors of the Loess Tunnel. Chinese Journal of Underground Space and Engineering, 2009, 5(2): 297－306. (in Chinese))
江 权, 冯夏庭, 向天兵. 基于强度折减原理的地下洞室群整体安全系数计算方法探讨.岩土力学, 2009, 30(8): 2483-2488. (JIANG Quan, FENG Xia-ting, XIANG Tian-bing. Discussion on Method for Calculating General Safety Factor of Underground Caverns Based on Strength Reduction Theory. Rock and Soil Mechanics. Rock and Soil Mechanics, 2009, 30(8): 2483-2488.(in Chinese))
李树忱,李术才,徐帮树. 隧道围岩稳定分析的最小安全系数法.岩土力学, 2007, 28(3): 549-554. (LI Shu-chen, LI Shu-cai, XU Bang-shu. Minimum Safety Factor Method for Stability Analysis of Surrounding Rockmass of Tunnel. Rock and Soil Mechanics, 2007, 28(3): 549-554. (in Chinese))
程选生,郑颖人.地震作用下无衬砌黄土隧道围岩结构安全系数的计算探讨.岩土力学, 2011, 32(3):769-774. (CHENG Xuan-sheng, ZHENG Ying-ren. Calculation Discussion about Safety Factor of Unlined Loess Tunnel Wall Rock Structure under Earthquake. Rock and Soil Mechanics, 2011, 32(3):769-774. (in Chinese))
王明年,林国进,于 丽,等. 隧道抗震与减震. 北京:科学出版社,2012. (WANG Ming-nian, LIN Guo-jin, YU Li, et al. Earthquake Relief and Reduction for Tunnel. Beijing: Science Press, 2012. (in Chinese))
基金
重庆交通大学(桥梁)结构工程重点实验室开放基金项目(CQSLBF-Y10-8)
PDF(1496 KB)
