【摘要】 通过有限元模拟计算了不同围岩条件、洞跨及地震烈度下的隧道地震反应特性,研究了隧道动力深浅埋划分界限及其影响因素。结果表明:隧道结构受力随着隧道埋深的增加呈现先增后减的变化规律,可见拐点即为深浅埋界限;围岩条件越好,隧道的动力深浅埋界限越深,隧道在Ⅲ级、Ⅳ级及Ⅴ级围岩条件下的动力深浅埋界限分别为100,80,60 m左右;隧道动力深浅埋界限深度随着隧道跨度的增加而减小,但其受影响程度较小,隧道在跨径为6,10,20 m的情况下的动力深浅埋界限分别为100,100,80 m左右;隧道动力深浅埋界限不受地震烈度的影响。更多还原

【Abstract】 The boundary of shallowly buried tunnel and deeply buried tunnel on dynamic characteristics and its influence factors are studied by using finite element to simulate the seismic response of tunnel with different surrounding rock condition,different tunnel span and different seismic intensity.The research results show that the stress of tunnel structure increases at first,and then decreases with increase of the buried depth.It indicates that the inflection point is the boundary of shallowly buried tunnel and deeply buried tunnel.The better the surrounding rock condition,the deeper the depth of the boundary will be,and in that condition the depth of the boundary in grade Ⅲ,grade Ⅳand grade Ⅴ rock is about 100,80 and 60 m respectively.The depth of the boundary decreases with the increase of the tunnel span,but the influence is little.In that condition the span is 6,10,20 m,and the corresponding depth of the boundary is about 100,100,80 m respectively.The seismic intensity will not influence the boundary of shallowly buried tunnel and deeply buried tunnel.更多还原