CAJ | 학술논문

以大西客运专线某隧道浅埋段为工程背景，针对三七微台阶法施工条件下的围岩变形特性进行了现场测试分析。实测结果表明：隧道在开挖的过程中其围岩变形受时间、空间效应的影响，整个时程曲线呈“厂”型，增长历时约25天；隧道纵向开挖面的影响距离大约为2倍的洞径；监测断面距离开挖面1倍的洞径时，拱顶下沉释放率均达到了70%以上，仰拱开挖时，拱顶下沉释放率增加了约30%；二次衬砌的合理施作时间约为隧道开挖后在初期支护施作16~19天后。该结果对深入了解类似隧道围岩变形规律，确定合适的支护时机很有意义。
이대서객운전선모수도천매단위공정배경，침대삼칠미태계법시공조건하적위암변형특성진행료현장측시분석。실측결과표명：수도재개알적과정중기위암변형수시간、공간효응적영향，정개시정곡선정“엄”형，증장력시약25천；수도종향개알면적영향거리대약위2배적동경；감측단면거리개알면1배적동경시，공정하침석방솔균체도료70%이상，앙공개알시，공정하침석방솔증가료약30%；이차츤체적합리시작시간약위수도개알후재초기지호시작16~19천후。해결과대심입료해유사수도위암변형규률，학정합괄적지호시궤흔유의의。
Taking shallow section of the Xinzhou tunnel in Datong-Xi'an passenger line as the engineering back-ground, this study uses site monitoring to measure space-time effect of surrounding rock deformation in three mi-cro bench seven step excavation method. Results show:deformation of surrounding rock is affected by space-time under excavation;the time curve is in inverted"L"shape and may last about 25 days;the impact distance of exca-vation face is about twice of the tunnel diameter longitudinally;when the distance between monitoring sections and excavation face is equal to the tunnel diameter, release rate of the vault crown settlement reaches more than 70%;when the invert is excavated, release rate of the vault crown settlement increases about 30%;the reasonable time of secondary lining construction is 16-19 days later after initial support construction. It is significant for compre-hending the surrounding rock deformation in details to determine the reasonable support time.