两种荷载对地下结构影响的对比分析

Comparative analysis of influence of two load on underground structure

针对现行地下结构设计规范只对人防等爆炸冲击荷载进行了规定,但是并没有考虑塌落触地冲击荷载影响的问题;对比分析了人防荷载与拆除爆破塌落触地冲击荷载对邻近地下结构造成的影响;首先介绍了人防荷载和塌落触地冲击荷载,并分析影响塌落触地冲击荷载的关键因素,再根据工程实际将塌落触地冲击荷载与人防荷载进行对比计算分析。结果表明:在所选取的对地下结构有利的塌落触地工况下,当结构埋深较小时,塌落触地冲击荷载大于相应的人防荷载,说明在进行建筑拆除时需要考虑塌落触地冲击对地下结构的影响。

In view of the fact that the current code for design of underground structures only stipulates the impact load of civil air defense and other explosions,and does not consider the impact load of collapse.The influence of civil air defense load and demolition blasting collapse impact load on adjacent underground structure is analyzed.Firstly,the civil air defense load and the impact load of collapse are introduced,and the key factors affecting the impact load are analyzed,then according to the engineering practice,the impact load of the collapse and the civil air defense load are compared computational analysis.The results show that under collapsed ground contact conditions that are beneficial to the undergound structure the impact load on the ground is greater than the corresponding civil air defense load when the buried depth of the structure is small,it is indicated that the impact on underground structure should be considered when demolition blasting the buildings.