Mechanism Model and Prevention and Control Measures of Karst Collapse Induced by Pile Foundation Construction

With the rapid development of urbanization in China, the collapse hazard in karst area are becoming more and more serious. However, the problem of karst collapse induced by pile foundation construction has not been paid attention to. The Longyuan Road area in Longgang District, Shenzhen is an area with strong karst development. This paper has taken the karst ground collapse event in this area as an example, using high-frequency and high-precision karst groundwater pressure monitoring methods to analyze the influence of pile foundation construction on karst groundwater and the law of soil cave development. The results show that the renewal project is the main inducement factor, and the pile foundation construction leads to the abrupt change of water and gas pressure in the karst underground, which leads to the loss of the soft fluid-plastic soil in the bottom of the quaternary system and forms the soil cave. The soil cave develops constantly, and finally causes the collapse of the karst surface. Furthermore, it is proposed that prior to the construction of pile foundations in karst areas, attention should be paid to the analysis of karst hydrogeological conditions during the detailed investigation stage, and the monitoring of karst groundwater and gas pressure should be strengthened. Reasonably design the construction technology of the pile foundation. Furthermore, the corresponding prevention and control measures such as real-time monitoring and control of karst groundwater pressure during the construction process will be strengthened.