CAJ | 학술논문

首先对修建于我国西南地区雅砻江干流上重要的梯级电站-- 锦屏一级水电站地下厂房洞室群的巨大规模、布置的复杂性,以及在极高地应力作用,和受到3条大断层及多组节理切割等复杂地质条件下,由于岩体强度较低及工程地质条件的不利组合,对地下厂房洞室群的稳定性提出的严峻挑战进行介绍.对该地下厂房洞室群施工中出现的远远超过同等规模的其他地下厂房的围岩变形,并表现出明显的时效性,还有衬砌开裂、围岩松动区持续加深、已经施工的锚杆锚索张力超限以及突然释放等各种特殊现象进行描述;然后从高地应力特点、岩体流变特性、变形特性等角度对这些现象产生的原因进行初步分析;最后针对上述情况对渐进性支护施工、分级控制锚索初始锁定张力、松动圈强化固结等若干对策的可行性进行探讨.
수선대수건우아국서남지구아롱강간류상중요적제급전참-- 금병일급수전참지하엄방동실군적거대규모、포치적복잡성,이급재겁고지응력작용,화수도3조대단층급다조절리절할등복잡지질조건하,유우암체강도교저급공정지질조건적불리조합,대지하엄방동실군적은정성제출적엄준도전진행개소.대해지하엄방동실군시공중출현적원원초과동등규모적기타지하엄방적위암변형,병표현출명현적시효성,환유츤체개렬、위암송동구지속가심、이경시공적묘간묘색장력초한이급돌연석방등각충특수현상진행묘술;연후종고지응력특점、암체류변특성、변형특성등각도대저사현상산생적원인진행초보분석;최후침대상술정황대점진성지호시공、분급공제묘색초시쇄정장력、송동권강화고결등약간대책적가행성진행탐토.
A brief introduction is given to the great challenge in the construction of Jinping I hydropower station,which is a key cascade underground hydropower project,located in the Southwest China,at the Yalong River. The challenge is caused by the following features. The project is very huge and the underground powerhouse system is very complicated,as well as the very high geostress and the complex geological conditions,including 3 large-scale faults and multiple sets of joints existing in the surrounding rock mass with poor quality combination. A detailed description is carried out to the extremely large deformations which is far beyond the deformation of other underground powerhouses with the same range of scale,and the time-related features of the deformation,the severe cracks of linings,the damaged zones develop continually,the over-loading of the rock- bolts and anchorages,during the excavation of the underground powerhouse caverns. All these phenomena happen frequently. Then,a preliminary analysis of those particular situations is given from the point of view of the relation of high stress level and the rheological feature of the rock mass. Finally,the feasibilities of several countermeasures are discussed,such as gradual support method,hierarchical controlling to the initial pre-stress of anchors,damage-zone consolidation and strengthening by the combination of bolting and grouting.