基于抗震性能的燃气管道廊外敷设方位优化分析

Aseismic Performance-based Optimal Analysis on the Installation Location of Directly Buried Gas Pipeline beyond the Utility Tunnel

按照“因地制宜、科学入廊”的现行管线入廊原则,次高压及以上燃气管道一般不纳入地下综合管廊。文章依托实际工程,根据廊外直埋燃气管道与地下综合管廊本体的不同方位关系设置多种工况,采用数值模拟对各工况廊外直埋燃气管道地震动力响应进行计算,对比分析计算结果后认为:(1)地下综合管廊本体可减弱其周边直埋燃气管道地震动力响应,即相比原无地下综合管廊状态,敷设于地下综合管廊周边的直埋燃气管道抗震性能更优;(2)地震作用下,当直埋燃气管道位于地下综合管廊本体正上方时,其地震加速度、位移及应力等地震响应的减弱幅度最大,当位于两侧时,两者间距越大,减弱幅度越小。据此对廊外直埋燃气管道的敷设方位提出以下建议:(1)当地下综合管廊位于道路正下方时,直埋燃气管道应尽量敷设在道路中央绿化带;(2)当地下综合管廊位于道路两侧非机动车道下方时,廊外直埋燃气管道应尽量敷设在靠近地下综合管廊本体的道路两侧绿化带范围内。

With the current guiding opinion for ingathering of municipal pipelines into the utility tunnel,the subhigh and high pressure gas pipeline would not be accommodated in utility tunnel.Considering the different position relations between directly buried gas pipeline and utility tunnel,multiple engineering conditions are set and the earthquake dynamic response of directly buried gas pipeline in each condition are calculated by numerical simula⁃tion in this research.The calculation results indicate that:(1)the utility tunnel could weaken the earthquake dynamic response of nearby directly buried gas pipeline,in other word,the seismic behavior of gas pipeline buried nearby utility tunnel is better;(2)under the action of earthquake,if the directly buried gas pipeline locates on the right above of utility tunnel,the decreasing extents of earthquake acceleration,displacement and stress are the highest,and the larger the spacing the smaller the amplitude if the gas pipeline locates at two sides of utility tunnel.Thus some suggestions are given to the location of directly buried gas pipeline:(1)if the utility tunnel locates right below the municipal road,the gas pipeline should buried within the central green belt;(2)if the utility tunnel locates un⁃derneath the non-motorway at two sides of road,the gas pipeline should buried within the green belts at two sides of road.