Research On Engineering Diseases On Ground Fracture Foundation And Their Prevention And Control Countermeasures

As a special geological disaster phenomenon,Xi'an ground fractures have reached14 according to the survey,covering the area of 250 square kilometers,and they are still active and developing.Due to the vast distribution of ground fractures in Xi'an,various infrastructure projects cannot be completely avoided.Ground fracture activities have caused many engineering diseases.According to statistics,the economic losses caused by such diseases have reached 10 billion yuan.With "Greater Xi'an" catching up and surpassing the pace of building an international metropolis,ground fracture disasters have severely restricted urban construction and economic development,and further research and implementation of ground fracture disease prevention and control measures are imminent..This article combines the distribution of existing ground fractures in Xi'an,activity characteristics and formation mechanisms,and focuses on engineering diseases and prevention measures in the area affected by ground fractures.The research has important reference value for the prevention and control of ground fracture disasters in future engineering construction.The main work of the thesis contains the following aspects:First of all,according to the location distribution and activity profile of the ground fractures in Xi'an,a large number of field investigations were conducted on the current hazards,sorted out according to different types of constructions,such as surface buildings,roads,bridges,and subways,analyzed the hazard characteristics and influence,and summarized the The basic damage characteristics of cracks lay the foundation for disease prevention research countermeasures.Secondly,with the help of ETABS software,through finite element analysis,the author has studied the impact of ground fracture activities at different distances on the structure of the building,it is concluded that the low-order mode shape of the structure is closely related to the initial vertical displacement of the structure;according to different engineering disciplines,The prevention and control measures for ground fractures were put forward respectively,and it was concluded that the avoidance principle is the most effective,most economical,and most direct countermeasure.The prevention of diseases is also closely related to underground confined water,structural forms,material types,and construction techniques.Finally,the prevention and control of ground fractures should run through the entire life cycle of the construction project.From project planning,design,construction to operation period,a comprehensive analysis of engineering examples is used to provide experience for the prevention and control of ground fractures.