【摘要】 利用FLAC3D软件对花岗岩隧道的地震响应机理及泡沫混凝土减震层的减震效果进行了分析。通过对比塑性区范围、围岩应力场分布、应变增量以及衬砌结构内力等指标,得出一些有益的结论:泡沫混凝土减震层能有效降低围岩中的最大主应力,并改善岩体中的应力场分布,使最大主应力出现的部位远离隧道临空面;其次,减震层还大幅降低了衬砌结构的轴力。该结论可为花岗岩隧道抗震设计提供一定的参考。更多还原

【Abstract】 The seismic responses of granite tunnel and the aseismic effectiveness of cellular concrete were studied using FLAC3D software.By analyzing the plastic zone,the stress field,the strain increment of surrounding rock and the inner force of liner,some useful solutions are concluded: the buffer layer of cellular concrete can effectively reduce the maximum principal stress of surrounding rock and the location of maximum principal stress may be moved to far away from the tunnel.The inner force of the liner is also reduced by a wide-range by setting the buffer layer.These results provide some references to seismic design of granite tunnel.更多还原