流变荷载试验曲线的模型识别及其应用

基于粘弹性理论,建立了流变荷载试验的Maxwell、广义Kelvin和Burgers3种流变模型的位移反演模式,并给出了根据现场试验流变曲线进行流变模型识别的简便方法。分析了岩体流变荷载试验曲线,给出了能反映试验区域内岩体变形规律的最佳流变模型,反演获得了试验区域内岩体的瞬时弹性模量、长期弹性模量、粘弹性模量和粘弹性系数。结果表明,描述试验点岩体在不同荷载级别情况下的最佳流变模型均为广义Kelvin模型,但其弹性模量有所差异,其量值范围为4194～5235MPa,平均弹性模量为4900.316MPa;平均长期弹性模量为3081.65MPa。计算表明所建立的反演公式是正确的,模型及参数识别过程简便、实用。

Model identification for rheological load test curve and its application

Based on the viscoelastic theory, inverse models of rheological displacement of load test were set up for Maxwell, generalized Kelvin and Burgers, and the rheological model of in-situ test curve was identified. The optimum rheological model of rock mass in the test area was given, and the instantaneous elastic modulus, long-term elastic modulus, viscoelastic modulus and viscoelastic coefficient were obtained by in-situ rheological load test curves. The analysis results show that the optimum rheological model is generalized Kelvin for different load steps at test points, but elastic moduli are different. The value ranges from 4?194 MPa to 5?235 MPa, and average modulus is 4?900.316 MPa, and average long-term modulus is 3?081.65 MPa. The inversion analysis formulas are correct .