Ground Settlement Deformation Analysis Of Xian San Zhi Qu In Airport New City Of Xixian New Area

The Airport New City of Xixian New Area is located in the Loess Plateau area on the north bank of the Weihe River.The rerouting section of Zhengping Street of Xian San Zhi Qu(K1+230~K1+350)is located in the north of Airport New City.The channel is built on the original loess gully and the lower part is collapsible.In the loess,the upper part is filled with a channel foundation of nearly 10 m high,and the filling is filled with plain soil.The canal was constructed before December 2017.In the absence of water,there are several transverse cracks in the filling section of the channel.The main crack is located in the center of the original gully.This problem caused the channel unable to irrigate soil in the following year spring,and affected the implementation of the rainwater pipe jacking project at a depth of about 20 m at the bottom of the canal.Through the on-site investigation,survey,laboratory test and theoretical calculation,this paper analyzes the settlement deformation of the Xian San Zhi Qu in the Airport New City of Xixian New Area.The main results can directly guide the design and construction of the Xian San Zhi Qu.The project provides reference and provides a scientific basis for the channel project in the loess area,and has achieved the following main understandings:(1)The site of the study area is located on the loess platform,and the geological structure is simple.The main strata are plain fill,loess and paleosol.The loess has a collapsibility level of II~III,good hydrogeological conditions,and human engineering activities.Stronger.(2)Under the combined action of filling,water seepage and pumping,the strength of the channel base is reduced,and the sedimentation of the loess is caused by cracking of the channel.(3)Based on the numerical simulation analysis,it is considered that the settlement deformation after the completion of the channel is mainly the self-compression deformation of the fill bank and the additional settlement of the original foundation,and the latter is the main one;and the seepage of the rain well will cause the original foundation to produce collapsible deformation.The deformation and damage of the channel are aggravated;the deformation is mainly vertical settlement deformation,and the horizontal deformation is small;the lime pile reinforcement scheme can effectively control the settlement deformation of the channel foundation under natural and saturated conditions,but the channel base slope is still larger.Deformation.