(1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Chongqing Energy College，Chongqing 400041，China；3. State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China)
Abstract：Aiming at the problem of deformation and stability about rock mass，with underground powerhouse caverns of a hydropower station hosted in basalt rock mass as background，taking three chambers(the generator chamber，the main transformer chamber and the tail water surge chamber) as objects of study，based on monitoring results during construction，surrounding rock mass deformation magnitude distribution and spatial distribution in underground powerhouse chambers are analysed firstly，then by means of geological information combining with excavation and construction progress，the law of in-depth and by-time are analysed，at last the deformation characteristics of basalt rock mass during construction are summarized，and the effect of the inner beddings of the basalt on surrounding rock displacement is analyzed at mean time. The research results show that，with structural surface enriched，but mosaic structure in basaltic，effects of structural surface on surrounding rock mass deformation are not obvious. Most parts of surrounding rock displacements are within 20 mm，and within the scope of 15 m depth the rock mass displacement presents flexibility state，and deformation developed continuity with depth，such kind of rock mass can be considered as a homogeneous medium. Construction is the main factor that affects the development of deformation，and along with excavation carried out，the surrounding rock displacement shows developing trend like step.
张志良，徐志英. 高地应力区地下洞室围岩稳定和变形分析[J]. 河海大学学报，1991，19(6)：9-15.(ZHANG Zhiliang，XU Zhiying. Stability and deformation analysis of rock surrounding underground opening in high ground stress areas[J]. Journal of Hohai University，1991，19(6)：9-15.(in Chinese))
[2]
李宏哲，夏才初，闫子舰，等. 锦屏水电站大理岩在高应力条件下的卸荷力学特性研究[J]. 岩石力学与工程学报，2007，26(10)：2104-2109.(LI Hongzhe，XIA Caichu，YAN Zijian，et al. Study on marble unloading mechanical properties of Jinping hydropower station under high geostress conditions[J]. Chinese Journal of Rock Mechanicsand Engineering，2007，26(10)：2104-2109.(in Chinese))
[3]
张志强，李宁，SWOBODA G.软弱夹层分布部位对洞室稳定性影响研究[J].岩石力学与工程学报，2005，24(18)：3252-3257.(ZHANG Zhiqiang，LI Ning，SWOBODA G. Influence of weak interbed distribution on stability of underground openings[J].Chinese Journal of Rock Mechanics and Engineering，2005，24(18)：3252-3257.(in Chinese))
[4]
樊启祥，王义锋. 向家坝水电站地下厂房缓倾角层状围岩稳定分析[J]. 岩石力学与工程学报，2010，29(7)：1307-1313.(FAN Qixiang，WANG Yifeng. Stability analysis of layered surrounding rock mass of large underground powerhouse of Xiangjiaba hydropower station[J].Chinese Journal of Rock Mechanics and Engineering，2010，29(7)：1307-1313.(in Chinese))
[5]
李宁，顾强康，张承客. 相邻洞室爆破施工对已有洞室的影响[J].岩石力学与工程学报，2009，28(1)：30-38.(LI Ning，GU Qiangkang，ZHANG Chengke. Influence of blasting on excavation of a new tunnel adjacent to existing tunnel[J].Chinese Journal of Rock Mechanics and Engineering，2009，28(1)：30-38.(in Chinese))
[6]
倪绍虎，肖明. 基于围岩松动圈的地下工程参数场位移反分析[J]. 岩石力学与工程学报，2009，28(7)：1439-1446.(NI Shaohu，XIAO Ming. Displacement back analysis of parameter field in underground engineering based on excavation damaged zone of surrounding rock[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(7)：1439-1446.(in Chinese))
[7]
卢波，王继敏，丁秀丽，等. 锦屏一级水电站地下厂房围岩开裂变形机制研究[J]. 岩石力学与工程学报，2010，29(12)：2429-2441.(LU Bo，WANG Jimin，DING Xiuli，et al. Study of deformation and cracking mechanism of surrounding rock of Jinping Iunderground powerhouse[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(12)：2429-2441.(in Chinese))
[8]
沈军辉，王兰生，徐林生，等.峨眉山玄武岩的岩相与岩体结构[J].水文地质工程地质，2001，(6)：1-4.(SHEN Junhui，WANG Lansheng，XU Linsheng，et al. The lithofacies and the rock mass structure of Emei Mountain basalt rock mass[J].Hydrogeology and Engineering Geology，2001，(6)：1-4.(in Chinese))
[9]
沈军辉，王兰生，李天斌，等.川西南玄武岩的岩体结构特征[J].成都理工学院学报，2002，29(6)：680-685.(SHENJunhui，WANGLansheng，LITianbin，et al. Rock mass structural features of basalt in southwest Sichuan[J].Journal of Chengdu University of Technology，2002，29(6)：680-685.(in Chinese))
[10]
王毅，杨建宏. 玄武岩的岩体结构与力学性状研究[J].岩石力学与工程学报，2002，21(9)：1307-1310.(WANG Yi，YANG Jianhong.Study on rock mass structure and mechanic property of basalt[J].ChineseJournal of Rock Mechanics and Engineering，2002，21(9)：1307-1310.(in Chinese))
[11]
李建强.玄武岩层内错动带发育特征及对岩体影响和作用[硕士学位论文][D].兰州：兰州大学，2008.(LI Jianqiang. Shear zones within layer of basalt and their effect on rock mass[M. S. Thesis][D].Lanzhou：Lanzhou University，2008.(in Chinese))
[12]
王奖臻，黄润秋，许模.金沙江下游白鹤滩水电站岩体结构的建造特征[J].地球科学进展，2004，19(增)：66-69.(WANG Jiangzhen，HUANG Runqiu，XU Mo. Characteristics of basalt of baihetan hydropower plant，Jinshariver，Southwest China[J].Advances in Earth Science，2004，19(Supp.)：66-69.(in Chinese))
[13]
魏云杰.中国西南水电工程区峨眉山玄武岩岩体结构特性及其工程应用研究[博士学位论文][D].成都：成都理工大学，2007.(WEI Yunjie. Study on characteristics of rock mass structure and engineering application of Emeishan basalts in project site of hydroelectric power station in Southwestern[Ph.D.Thesis][D]. Chengdu：Chengdu University of Technology，2007.(in Chinese))
[14]
李洪建，聂德新，傅荣华. 不同地质环境下的玄武岩岩体结构评价指标的选取[J].工程地质学报，2009，17(3)：363-366.(LI Hongjian，NIE Dexin，FU Ronghua. Selection of indices for evaluation of basalt rock structures at different geological environments[J]. Journal of Engineering Geology，2009，17(3)：363-366.(in Chinese))
2014, Vol. 33 
