论文部分内容阅读
基于加速应力试验方法,借助概率统计理论分析了以水泥、水和气泡群为组成材料的气泡混合轻质土疲劳寿命的特点及其分布,建立了气泡混合轻质土的线性化疲劳方程,预测了气泡混合轻质土在正常车辆荷载作用下的使用寿命。研究结论表明:通过不同加速应力下疲劳寿命的平均值、标准差和变异系数3个指标判别,同一应力下的气泡混合轻质土的疲劳寿命离散性较小,离散程度随着加速应力的增大而增大;基于加速应力试验结果线性回归分析,证明气泡混合轻质土疲劳寿命服从对数正态分布;建立了气泡混合轻质土的疲劳寿命方程,表明疲劳寿命的对数是加速应力的递减函数;估计了正常车辆荷载作用下气泡混合轻质土的平均使用寿命约为73 a。
Based on the accelerated stress test method, the characteristics and distribution of the fatigue life of bubble mixed lightweight soils with cement, water and bubble groups as the constituent materials are analyzed by means of probability statistics theory. The linearized fatigue equation of the bubble mixed light soil is established. The prediction The life of bubble mixed light soil under normal vehicle load. The results show that the dispersion of fatigue life of bubble-mixed lightweight soils under the same stress is small, and the dispersion degree increases with the increase of acceleration stress through the three indexes of average fatigue life under different accelerating stress, standard deviation and coefficient of variation Based on the linear regression analysis of accelerated stress test results, it is proved that the fatigue life of bubble-mixed light soil obeys lognormal distribution and the fatigue life equation of bubble mixed light soil is established. It shows that the logarithm of fatigue life is the acceleration stress The average service life of bubble mixed light soil under normal vehicle load is estimated to be about 73 a.