CAJ | 학술논문

锦屏二级水电站深埋隧洞中大理岩洞段处于高水压力和高应力环境中，该段在施工过程中多次发生严重突水灾害。对该段大理岩的高水压条件岩石力学试验表明，高水压条件下，岩石应力-应变曲线在峰值应力附近出现明显平缓段，应力降大，岩石峰值强度及脆性破坏后破碎程度随水压力升高而升高，岩石试件以压致拉裂破坏为主。基于高水压条件下裂纹周边应力解析分析，认为裂隙中高水压力存在降低了裂隙尖端附近高应力集中效应，与加载方向一定小夹角范围内的微裂隙尖端附近最大拉应力集中程度接近，这使得岩石中应变能可进一步积累、压致拉裂型微裂隙数量进一步增加，岩石呈脆性破坏，并且破碎程度明显增加。研究工作对深埋隧洞突水灾害防治及强降雨诱发高速滑坡灾害预防具有重要的理论和现实意义。
금병이급수전참심매수동중대리암동단처우고수압력화고응력배경중，해단재시공과정중다차발생엄중돌수재해。대해단대리암적고수압조건암석역학시험표명，고수압조건하，암석응력-응변곡선재봉치응력부근출현명현평완단，응력강대，암석봉치강도급취성파배후파쇄정도수수압력승고이승고，암석시건이압치랍렬파배위주。기우고수압조건하렬문주변응력해석분석，인위렬극중고수압력존재강저료렬극첨단부근고응력집중효응，여가재방향일정소협각범위내적미렬극첨단부근최대랍응력집중정도접근，저사득암석중응변능가진일보적루、압치랍렬형미렬극수량진일보증가，암석정취성파배，병차파쇄정도명현증가。연구공작대심매수동돌수재해방치급강강우유발고속활파재해예방구유중요적이론화현실의의。
Marble under the environment of high water pressure and high stress are present in the deep buriedtunnel of Jinping-II Hydropower Station.Several serious tunnel gushing hazards occurred at the marble sectionsduring the construction process of the deep buried tunnel.Marble mechanical test under high water pressureindicates that a flat section appears near peak stress on the stressstrain curve.The stress drop is very big.Rockpeak strength and degree of crushing after brittle failure increase with the increasing of water pressure.Compressioncracking is the main failure pattern of marble samples.Stress analysis around cracks suggests that high waterpressure in cracks reduces the stress concentration effects near crack tip,and the approximately equal concentrationeffects of maximum tensile stress near crack tips within a small angle range from loading direction.Therefore,thestrain energy and the compressioncracking microcrack quantity in the marble can further increase.The brittlefailure can be developed.The degree of crushing of rock is significantly increased.This study has important academic and practical significances for the prevention of deep buried tunnel gushing hazards and high speed landslide hazards induced by heavy rainfall.