猴子岩水电站地下厂房施工期围岩变形特征分析
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摘要
猴子岩水电站地下厂房岩体具有地应力高、强度应力比低的特点,在施工过程中出现岩体片帮、锚头内陷、喷混凝土层开裂等变形现象。研究成果表明:未开挖时间段内围岩声波波速和卸荷松弛深度以没有明显变化为主;开挖时间段内围岩岩体卸荷松弛深度多随逐层开挖由表及里增加、围岩声波波速多随逐层开挖由表及里衰减,表明猴子岩水电站地下厂房岩体变形以开挖后应力释放致岩体损伤以为主。
The rock mass in underground powerhouse of Houziyan hydropower station is characterized with high ground stress and low strength stress ratio. Deformation phenomenon such as rock mass spalling,anchor head invagination,shotcrete layer cracking occurred during construction. Research results show that acoustic wave velocity and relaxation depth did not change significantly in surrounding rocks during the non-excavation period; relaxation depth in rock mass increased from the outside to the inside layer by layer during excavation and the acoustic wave velocity of surrounding rock attenuated from the outside to the inside layer by layer during the excavation. Therefore,rock mass damage caused by stress release after excavation is considered as main phenomenon of rock mass deformation of underground powerhouse at Houziyan hydropower station
The rock mass in underground powerhouse of Houziyan hydropower station is characterized with high ground stress and low strength stress ratio. Deformation phenomenon such as rock mass spalling,anchor head invagination,shotcrete layer cracking occurred during construction. Research results show that acoustic wave velocity and relaxation depth did not change significantly in surrounding rocks during the non-excavation period; relaxation depth in rock mass increased from the outside to the inside layer by layer during excavation and the acoustic wave velocity of surrounding rock attenuated from the outside to the inside layer by layer during the excavation. Therefore,rock mass damage caused by stress release after excavation is considered as main phenomenon of rock mass deformation of underground powerhouse at Houziyan hydropower station
引文
[1]魏进兵,邓建辉,王俤剀等.锦屏一级水电站地下厂房围岩变形与破坏特征分析[J].岩石力学与工程学报,2010,29(6):1198~1205.
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[6]沙椿,李彪,徐奴文等.地下洞室群开挖卸荷过程微震活动特征研究[J].长江科学院院报,2014,31(11):102~107.
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[2]姚强,杨兴国,刘勇林等.大型地下厂房洞室群施工期围岩变形分析[J].地下空间与工程学报,2014,10(5):1164~1169.
[3]刘永波,左雷高,闵勇章.长河坝水电站地下厂房围岩变形特征[J].四川水力发电,2016,35(1):49~53.
[4]李志鹏,徐光黎,董家兴.猴子岩水电站地下厂房洞室群施工期围岩变形与破坏特征[J].岩石力学与工程学报,2014,33(11):2291~2300.
[5]王俤剀,蔡德文,董瑜斐等.猴子岩水电站地下厂房围岩变形特征分析与控制[J].人民长江,2014,45(8):66~84.
[6]沙椿,李彪,徐奴文等.地下洞室群开挖卸荷过程微震活动特征研究[J].长江科学院院报,2014,31(11):102~107.
[7]戴峰,李彪,徐奴文.猴子岩水电站深埋地下厂房开挖损伤区特征分析[J].岩石力学与工程学报,2015,34(4):735~746.