|
|
|
| A NEW DISPLACEMENT PREDICTION METHOD OF BRITTLE JOINTED ROCK MASS CONSIDERING EXCAVATION UNLOADING SPLITTING EFFECT |
| LI Xiaojing1，2，ZHU Weishen2，LI Shucai2，YANG Weimin2 |
(1. School of Civil Engineering，Shandong Jianzhu University，Jinan，Shandong 250101，China；
2. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China) |
|
|
|
|
Abstract Splitting failure happened frequently in the brittle surrounding rock mass of underground powerhouse cavern groups in southwest of China while excavation was performed. This kind of special engineering phenomenon has obtained become more and more attentions now. Adopting the linear slippage crack groups splitting model and applying fracture mechanics，energy analysis and crack propagation，the splitting criterion of cavern rock mass and displacement forecasting method reflecting splitting opening displacement was derived. Meanwhile，the effect of intrinsic cracks propagating into macroscopical splitting cracks parallel to the side wall of caverns approximately was considered. Moreover，the forecasting method was applied to the Jinping I hydropower station underground caverns engineering in China；the splitting failure zone and forecasting displacement were coincide with the monitoring data. The new forecasting displacement method could benefit the construction of similar underground caverns.
|
|
Received: 30 January 2011
|
|
|
|
| [1] 李仲奎，周 钟，汤雪峰，等. 锦屏一级水电站地下厂房洞室群稳定性分析与思考[J]. 岩石力学与工程学报，2009，28(11)：2 167– 2 175.(LI Zhongkui，ZHOU Zhong，TANG Xuefeng，et al. Stability analysis and considerations of underground powerhouse caverns group of Jinping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(11)：2 167–2 175.(in Chinese))
[2] 李 宁，孙宏超，姚显春，等. 地下厂房母线洞环向裂缝成因分析及处理措施[J]. 岩石力学与工程学报，2008，27(3)：439–446.(LI Ning，SUN Hongchao，YAO Xianchun，et al. Cause analysis of circumferential splits in surrounding rock of bus-bar tunnels in underground powerhouses and reinforced measures[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(3)：439–446.(in Chinese))
[3] 苏国韶，冯夏庭，江 权，等. 高地应力下大型地下洞室群开挖顺序与支护参数组合优化的智能方法[J]. 岩石力学与工程学报，2007，26(增1)：2 800–2 808.(SU Guoshao，FENG Xiating，JIANG Quan，et al. Intelligent method of combinatorial optimization of excavation sequence and support parameters for large underground caverns under condition of high geostress[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：2 800–2 808.(in Chinese))
[4] 王明洋，宋 华，郑大亮，等. 深部巷道围岩的分区破裂机制及“深部”界定探讨[J]. 岩石力学与工程学报，2006，25(9)：1 771– 1 776.(WANG Mingyang，SONG Hua，ZHENG Daliang，et al，On mechanism of zonal disintegration within rock mass around deep tunnel and definition of “deep rock engineering”[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(9)：1 771–1 776.(in Chinese))
[5] HIBINO S，MOTOJMA M. Characteristic behavior of rock mass during excavation of large caverns[C]// Proceedings of the 8th International Congress on Rock Mechanics. Tokyo，Japan：[s.n.]，1995：583–586.
[6] 李晓静. 深埋洞室劈裂破坏形成机制的试验和理论研究[博士学位论文][D]. 济南：山东大学，2007.(LI Xiaojing. The study on experiment and theory of splitting failure in great depth openings[Ph. D. Thesis][D]. Jinan：Shandong University，2007.(in Chinese))
[7] LAJTAI E Z，CARTER B J，DUNCAN S. Mapping the state of fracture around cavities[J]. Engineering Geology，1991，31(3/4)：277–289.
[8] KEMENY J M. A model for nonlinear rock deformation under compression due to subcritical crack growth[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1991，28(6)：459–467.
[9] MARTIN C D，CHANDLER N. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643–659.
[10] 缪协兴，安里千. 岩(煤)壁中滑移裂纹扩展的冲击矿压模型[J]. 中国矿业大学学报，1999，28(2)：113–117.(MIAO Xiexing，AN Liqian. Model of rockburst for extension of slip fracture in palisades[J]. Journal of China University of Mining and Technology，1999，28(2)：113–117.(in Chinese))
[11] China Aviation Institute. Handbook of stress intensity factors[M]. Beijing：Science Press，1993：2–6.
[12] SONG L，LAJTAI E Z. Modeling the stress-strain diagram for brittle rock loaded in compression[J]. Mechanics of Materials，1998，30(3)：243–251.
[13] DYSKIN A V，GERMANOVICH L N. Model of rockbrust caused by cracks growing near free surface[C]// YOUNG P ed. Rockbursts and Seismicity in Mines 93. Rotterdam：Balkema，1993：169–175.
[14] 陈赛超，董燕君，鲁晓明，等. 锦屏一级水电站引水发电系统及地下厂房安全监测专题报告[R]. 锦屏：锦屏建设管理局锦屏一级安全监测管理中心，2009.(CHEN Saichao，DONG Yanjun，LU Xiaoming，et al. Special report on the safety monitoring for the water supply and power generation system and the underground powerhouse of Jinping I hydropower project[R]. Jinping：Jinping I Safety Monitoring and Management Center of Jinping Construction Bureau，2009.(in Chinese))
[15] 赖 勇，张永兴. 岩体微裂纹密度确定方法及应用[J]. 土木建筑与 环境工程，2009，31(2)：51–56.(LAI Yong，ZHANG Yongxing. Methods of rock crack density determination and their application[J]. Journal of Civil，Architectural and Environmental Engineering，2009，31(2)：51–56.(in Chinese))
[16] ZHU W S，LI X J，ZHANG Q B，et al. A study on sidewall displacement prediction and stability evaluations for large underground power station caverns[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(7)：1 055–1 062.
[17] LI X J，ZHU W S，YANG W M. A new forecast method of opening displacement and its engineering application[C]// Proceedings of the 43rd U.S. Rock Mechanics Symposium. [S.l.]：[s.n.]，2009：167–171.
[18] LI X J， ZHU W S， YANG W M. A splitting failure criterion of surrounding rock mass in depth and high in-situ stress region and its engineering application[C]// Proceedings of the International Young Scholars? Symposium on Rock Mechanics. [S.l.]：[s.n.]，2008：1 125– 1 129.
[19] 孙林锋. 不同地应力特征及不同屈服准则对地下洞室稳定性影响研究[硕士学位论文][M]. 济南：山东大学，2009.(SUN Linfeng. Study on the stability of the underground cavern group under the conditions of different in-situ stresses characteristics and different yield criteria[M. S. Thesis][D]. Jinan：Shandong University，2009.(in Chinese)) |
|
|
|
2011, Vol. 30 
