...围岩塑性区 侧压系数 [gap=722]Keywords : nonuniform stress field； round tunnel；surrounding rock mass plastic zone；coefficient of horizontal pressure ..
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围岩塑性区面积也随振幅增大而增大。
The magnifying coefficient and the area of plastic zone of surrounding rock increase with the increase of amplitude.
围岩塑性区主要集中在隧道的周围和溶洞的左右侧部，溶洞的顶部和底部处塑性区较少。
The plastic zone of the surrounding rock mainly concentrates around the tunnel and the two sides of karst cave while the top and the bottom of karst cave have little plastic zone.
进一步验证了前一部分研究工作的可信性。弹塑性分析的结果说明断层对隧洞围岩塑性区的分布也有明显的影响。
The result of elastoplastic analysis proves that the effects of fault on the distribution of tunnel surrounding rock mass plastic zone also are significant.
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