基于尖点突变模型的地铁深基坑土压力预警阈值研究

为提高地铁施工灾害预警的准确性和可靠性,将尖点突变模型引入地铁施工灾害预警阈值的研究中,建立基于时效影响因子的地铁深基坑土压力尖点突变模型。该模型利用突变流形分析系统的平衡和临界状态,通过势函数突变点临界值确定预警阈值的大小,为地铁施工灾害预警工作提供科学依据。通过实例分析,计算出考虑时间效应的土压力预警阈值。结果表明,地铁深基坑土压力尖点突变模型消除了计算过程中的人为因素影响,并能反映基坑土压力突变的特点。当然,在实际工程施工中,需要对预警阈值进行及时的重新修正,以适应外界环境和技术的不断更新变化。

Research on Earth Pressure Warning Threshold of Subway Deep Excavation Based on Cusp Catastrophe Model

In order to improve the accuracy and reliability of the subway construction disaster warning,a cusp catastrophe model was built based on the aging impact factor.The balance and critical states of the system were analyzed using mutation manifold,the warning threshold value was determined using the critical value of potential function mutation.Through a certain engineering example analysis,the earth pressure warning threshold value was calculated with the effect of time considered.It is obvious that the cusp catastrophe model overcomes human factors in the calculation process,reflects the characteristics of the pit earth pressure mutation.Of course,the warning threshold value given here should be changed according to the changing environment and technology.