CAJ | 학술논문

针对兰渝线两水隧道穿越炭质软岩、设计施工难度大、初支变形不满足稳定性条件、衬砌较早施作而引起开裂等问题，开展双层支护研究工作。通过现场试验对试验段初期支护围岩变形、围岩压力、接触压力、钢架应力、钢筋应力和混凝土应力等监测。得到初期支护隧道围岩与结构的力学及变形特性，分析其随时间的变化特点和沿隧道横断面的空间分布规律。研究结果表明：围岩压力、钢架应力和喷混凝土应力随开挖进程存在急剧变化阶段，易受施工扰动影响，敏感性随时间逐渐降低，结构应力沿隧道横断面的空间分布呈现“上下大，两侧小”的分布规律。研究结果对建立科学合理的软弱围岩隧道支护结构设计方法具有一定的指导意义。
침대란투선량수수도천월탄질연암、설계시공난도대、초지변형불만족은정성조건、츤체교조시작이인기개렬등문제，개전쌍층지호연구공작。통과현장시험대시험단초기지호위암변형、위암압력、접촉압력、강가응력、강근응력화혼응토응력등감측。득도초기지호수도위암여결구적역학급변형특성，분석기수시간적변화특점화연수도횡단면적공간분포규률。연구결과표명：위암압력、강가응력화분혼응토응력수개알진정존재급극변화계단，역수시공우동영향，민감성수시간축점강저，결구응력연수도횡단면적공간분포정현“상하대，량측소”적분포규률。연구결과대건립과학합리적연약위암수도지호결구설계방법구유일정적지도의의。
For Liang Shui Tunnel in Lanzhou -Chongqing railway passing through soft rock,design and construc-tion difficulty,early support deformation stability condition,earlier lining causes cracks and other problems,the paper carried out a double support research work,through initial support deformation,rock pressure,the contact pressure,steel stress,concrete stress in the test section.Development law over time and spatial distribution a-long the tunnel ring of the above test items were discussed.During the excavation in the tunnel,rock pressure, steel stress and concrete stress change rapidly,and sensitivity decreases in turn with the character “up and down larger,side smaller”,along the tunnel cross section.It can provide references to accurately establish support structure design method of soft rock tunnel.