损伤状态下某桩板式挡土墙稳定性预警

为了探究受损挡土墙结构的稳定性预警方法,首先分析挡墙-土体系统受力状态和土压力与挡墙稳定性及土体基床系数之间的关系;其次基于小波包频带能量谱分析,提出损伤预警指标——能量比变异系数(ERVC);然后分析ERVC、土压力及挡墙稳定性三者间的内在联系,提出一种用于损伤状态下的挡墙结构稳定性预警方法,即通过ERVC预警挡墙的稳定状态;最后以某桩板式挡墙为例,建立墙-土系统简化力学模型及其有限元模型,并修正有限元模型参数,得到墙-土系统基准有限元模型,以验证该预警方法的有效性。结果表明:随ERVC增大,挡墙稳定性逐渐降低;当ERVC达到界限值时,挡墙进入临界稳定状态。

Stability alarming for a pile plate retaining wall with damage

In order to investigate stability alarming method for damaged retaining walls,firstly,mechanical condition of retaining wall-soil system and relationships between earth pressure and wall stability as well as coefficient of subgrade reaction to soil were analyzed.Secondly,a damage alarming index,ERVC,was proposed based on wavelet packet frequency band energy spectrum analysis.Then,intrinsic connection among ERVC,earth pressure and stability of retaining walls was analyzed,and a stability alarming method for retaining walls with damage was put forward,namely,stability of walls being alarmed via ERVC.Finally,with a pile plate retaining wall as an example,a simplified mechanical model and finite element model of wall-soil system were established,and by updating parameters of the model,a standard model was obtained to verify proposed alarming method.The results show that with increase of ERVC value,wall stability decreases and it will enter critical stable state when ERVC reaches threshold value.