Dynamic response law about gravity retaining wall to seismic characteristics and earth fill properti

• 作 者: 林于廉 刘涌江 李家杰
• 机 构: College of Urban Construction and Environmental Engineering,Chongqing University,Key Laboratory of T
• 出 处: Journal of Central South University
• 发表日期: 2012年03期
• 关键词: retaining cohesion modulus burst filled resultant gravity intersection walls fri

In order to find the dynamic response laws of retaining walls affected by certain earthquake loads,the influence of the seismic wave characteristics and sub-grade fill parameters(including the foundation surface slope) were focused on,and a series of tests were performed.The results show that the maximum stress of the retaining wall decreases as internal friction angle,foundation slope,filled soil cohesion and the biggest dynamic elastic modulus increase,while it increases with the seismic frequency and seismic input peak dropping.The addition value of dynamics earth pressure increases when seismic frequency and seismic input peak are reduced,while it decreases when the filled soil cohesion and internal friction angle rise.Meanwhile,dynamic elastic modulus and foundation slope have no obvious influences on addition value of dynamics earth pressure.The slope will be instable if the seismic input peak exceeds 0.5g and be disruptive if seismic frequency is larger than 2.5 Hz.The mid-lower parts of retaining walls are in most heavy and obvious response to these factors,which reveals the mechanism of “belly burst” in retaining wall that appears commonly in practical projects.

In order to find the dynamic response laws of retaining walls affected by certain earthquake loads, the influence of the seismic wave characteristics and sub-grade fill parameters (including the foundation surface slope) were focused on, and a series of tests were performed. results show that the maximum stress of the retaining wall decreases as internal friction angle, foundation slope, filled soil cohesion and the biggest dynamic elastic modulus increase, while it increases with the seismic frequency and seismic input peak dropping. addition value of dynamics earth pressure increases when seismic frequency and seismic input peak are reduced, while it decreases when the filled soil cohesion and internal friction angle rise.Meanwhile, dynamic elastic modulus and foundation slope have no obvious influences on addition value of dynamics earth pressure. The slope will be instable if the seismic input peak exceeds 0.5g and be disruptive if seismic frequency is larger than 2.5 Hz. mid-lower parts of retaining walls are in most heavy and obvious response to these factors, which reveals the mechanism of “belly burst ” in retaining wall that appears generally in practical projects.