复杂地质条件下深基坑支护结构动态可靠度研究

Research on dynamic reliability of deep foundation pit supporting structure under complicated geological conditions

复杂地质中有较多的土层因素影响深基坑支护结构动态可靠度,支护结构应用过程中所产生的数据与周围参数并没有完全应用在可靠性分析中。首先从深基坑支护结构动态指数分析,应用目标函数确定支护结构动态极限状态,再确定极限状态下的可靠度指标并计算结构失稳概率;其次建立数据模拟模型,采集复杂地质环境中的相关参数代入模拟公式中,确定不同工况状态下不同地质条件对可靠度指标的影响;最后再建立可靠度计算函数模型,实现数据的精确落实,实时控制可靠度指标的动态发展;在实例应用的结果对比中可知,复杂地质条件下深基坑支护结构动态可靠度需要在外部支撑点的辅助下能够实现最佳可靠状态。

There are many soil factors in complex geology that affect the dynamic reliability of the supporting structure of deep foundation pits.The data and surrounding parameters generated during the application of the supporting structure are not completely used in the reliability analysis.First,analyze the dynamic index of the deep foundation pit supporting structure,use the objective function to determine the dynamic limit state of the supporting structure,and then determine the reliability index under the limit state and calculate the probability of structural instability.Secondly,establish a data simulation model to collect data from complex geological environments Substituting the relevant parameters into the simulation formula to determine the influence of different geological conditions on the reliability index under different working conditions.Finally establish the reliability calculation function model to achieve accurate data implementation and real-time control of the dynamic development of the reliability index.From the comparison of the application results,it can be seen that the dynamic reliability of the deep foundation pit supporting structure under complex geological conditions needs to be assisted by external support points to achieve the best reliable state.