摘要
依托云南某临近库区隧道工程,建立了考虑库区蓄水-地震共同作用下隧道地震响应数值模型,开展了蓄水和地震作用下邻库区隧道的力学响应分析,探讨近库区隧道地震响应特征及蓄水高度、地震动强度对隧道地震响应的影响规律。结果表明:蓄水-地震耦合作用下,围岩应力明显增加且出现局部拉应力区域,不利于围岩稳定性;增大了衬砌内力,其中弯矩增幅达2倍,降低了隧道结构安全系数,对结构安全性产生较大的影响。随着地震动强度增大,衬砌结构安全系数迅速降低,但下降幅度随衬砌部位不同而异。在地震荷载作用下,结构主要受地震荷载的影响,而蓄水位高度变化的影响较小。
Relying on a tunnel project in a nearby reservoir area in Yunnan,a numerical model of tunnel seismic response under the combined action of water storage and earthquake in the reservoir area was established,and the mechanical response analysis of tunnels in the adjacent reservoir area under water storage and earthquakes was carried out to discuss the influence of the response characteristics of tunnel earthquake near the reservoir area,water storage height and ground motion intensity on tunnel earthquake response.The results show that under the coupling action of water storage and earthquake,the stress of surrounding rock increases significantly and local tensile stress areas appear,which is not conducive to the stability of surrounding rock;the internal force of the lining is increased,and the bending moment is increased by 2 times,which reduces the safety factor of the tunnel structure and has a greater impact on structural safety.With the increase of ground motion intensity,the safety factor of the lining structure decreases rapidly,but the degree of decrease varies with the position of the lining.Under the action of earthquake load,the structure is mainly affected by the earthquake load,and the influence of the height of the storage water level is relatively small.
作者
苑辉
杨绪祥
汪伟伟
丁祖德
YUAN Hui;YANG Xuxiang;WANG Weiwei;DING Zude(Kunming University of Science and Technology,Kunming 650050;不详)
出处
《工业安全与环保》
2021年第12期41-45,共5页
Industrial Safety and Environmental Protection
基金
云南省交通厅科技项目(2017A-04)。
关键词
隧道工程
蓄水-地震耦合作用
地震响应
tunnel engineering
water storage-seismic coupling
seismic response
