西安站改扩建工程附近f3地裂缝影响研究

Study on affection of ground fissure f3 near Xi’an railway station for reconstruction and extension project of the station

本文以西安火车站扩建工程场地周围f3地裂缝勘察资料为研究背景,统计地裂缝周围地层的各项指标,利用Flac3D数值模拟软件对研究对象进行数值模拟,并将抽水影响下地裂缝活动速率与近年来地裂缝活动规律进行对比,研究结果表明,地裂缝两盘差异沉降与古土壤层的错断量和地下水位的下降量呈正相关关系;地裂缝安全避让距离确定为上盘(包括地裂缝带)40m、下盘20m,总避让带宽度为60m;未来十年内f3地裂缝的活动将会缓慢持续,但不影响西安火车站的正常运行。

Taking the f3 fracture survey data around the reconstruction and extension project sites of Xi’an railway station as the study background,the statistic indicators of the ground fissure formation are obtained.The Flac3D numerical simulation software is used to simulate the study object,and the move rate of the ground fissure affected by the field pumping is compared with the moving regularity of the ground fissure in recent years.It is concluded that there is the positive correlated relationship between the differential settlement of the ground fissure two sets and the fault broken value of the ancient soil,the falling value of groundwater levels;the safe avoidance distance for the ground fracture is determined as 40m in the upper side(including the ground fracture zone),20m in the footwall,and 60m in the total width of the avoidance zone;in the next ten years,the activity of the ground fissure f3 will continue slowly,but it will not affect the normal operation of Xi’an railway station.