半正弦循环荷载作用下的一维非线性固结
发布时间：2019-03-16 18:50
【摘要】：针对高速公路、机场、铁路等设施上的交通荷载易引发路基土的固结沉降问题,将交通荷载视为半正弦循环荷载,分析该类荷载作用下土体的固结过程以及荷载间歇期、荷载频率、初始超静孔隙水压力等参量对固结过程的影响。通过修正Davis假定,使一维非线性固结控制方程适用于模拟具有非零初始超静孔隙水压力条件的饱和土固结过程,采用分离变量法推导半正弦循环荷载作用下一维非线性固结方程通解,并给出初始超静孔隙水压力为常数、正三角形分布和倒三角形分布3种典型初始条件下的解析解。模拟了不同的荷载间歇期、荷载频率和初始超静孔隙水压力条件下均质饱和黏土的固结过程。结果表明:固结过程中超静孔隙水压力峰值随时间增大而减小,有效应力和平均固结度峰值随时间增大而增大;初始条件的差异对固结过程的早期具有明显的影响,当初始超静孔隙水压力为0时,有效应力和平均固结度峰值均最大,其他情况下从大到小依次为倒三角形分布、正三角形分布、矩形分布;间歇期或荷载频率的差异对整个固结过程均存在影响,随着间歇期的增大,达到稳定时的平均固结峰值减小,固结过程延缓,随着荷载频率的减小,平均固结度峰值增大,固结过程加快。
[Abstract]:In view of the consolidation settlement of roadbed soil easily caused by traffic load on expressway, airport, railway and other facilities, the traffic load is regarded as semi-sinusoidal cyclic load, and the consolidation process of soil under this kind of load as well as the intermittent period of load are analyzed. The influence of load frequency, initial hydrostatic pressure and other parameters on consolidation process. By modifying the Davis assumption, the one-dimensional nonlinear consolidation control equation is applied to simulate the consolidation process of saturated soils with non-zero initial hydrostatic pressure conditions. The general solution of one-dimensional nonlinear consolidation equation under semi-sinusoidal cyclic load is derived by the method of separated variables, and the analytical solutions under three typical initial conditions, i.e., the initial ultra-static pore water pressure is constant, the triangular distribution and the inverted triangular distribution are given. The consolidation process of homogeneous saturated clay under different loading intervals, loading frequency and initial hydrostatic pore pressure is simulated. The results show that the peak value of water pressure in excess pore space decreases with the increase of time, while the peak value of effective stress and average consolidation degree increases with the increase of time in the consolidation process. The difference of initial conditions has obvious influence on the early stage of consolidation process. At the beginning, the peak value of effective stress and average consolidation degree is maximum when the water pressure of excess pore space is 0. In other cases, the distribution of effective stress and average consolidation degree is inverted triangle in turn from large to small. Triangular distribution, rectangular distribution; With the increase of intermittent period, the average consolidation peak value decreases and the consolidation process slows down. With the decrease of load frequency, the average consolidation degree peak value increases, and the average consolidation peak value increases with the increase of the intermittent period, and the average consolidation peak value increases with the increase of the load frequency. The consolidation process is accelerated.
【作者单位】： 长安大学环境科学与工程学院;长安大学旱区地下水文与生态效应教育部重点实验室;陕西理工大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(41602237) 中央高校基本科研业务费专项资金项目(310829151076,310829161011,310829163307)
【分类号】：U416.1
[Abstract]:In view of the consolidation settlement of roadbed soil easily caused by traffic load on expressway, airport, railway and other facilities, the traffic load is regarded as semi-sinusoidal cyclic load, and the consolidation process of soil under this kind of load as well as the intermittent period of load are analyzed. The influence of load frequency, initial hydrostatic pressure and other parameters on consolidation process. By modifying the Davis assumption, the one-dimensional nonlinear consolidation control equation is applied to simulate the consolidation process of saturated soils with non-zero initial hydrostatic pressure conditions. The general solution of one-dimensional nonlinear consolidation equation under semi-sinusoidal cyclic load is derived by the method of separated variables, and the analytical solutions under three typical initial conditions, i.e., the initial ultra-static pore water pressure is constant, the triangular distribution and the inverted triangular distribution are given. The consolidation process of homogeneous saturated clay under different loading intervals, loading frequency and initial hydrostatic pore pressure is simulated. The results show that the peak value of water pressure in excess pore space decreases with the increase of time, while the peak value of effective stress and average consolidation degree increases with the increase of time in the consolidation process. The difference of initial conditions has obvious influence on the early stage of consolidation process. At the beginning, the peak value of effective stress and average consolidation degree is maximum when the water pressure of excess pore space is 0. In other cases, the distribution of effective stress and average consolidation degree is inverted triangle in turn from large to small. Triangular distribution, rectangular distribution; With the increase of intermittent period, the average consolidation peak value decreases and the consolidation process slows down. With the decrease of load frequency, the average consolidation degree peak value increases, and the average consolidation peak value increases with the increase of the intermittent period, and the average consolidation peak value increases with the increase of the load frequency. The consolidation process is accelerated.
【作者单位】： 长安大学环境科学与工程学院;长安大学旱区地下水文与生态效应教育部重点实验室;陕西理工大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(41602237) 中央高校基本科研业务费专项资金项目(310829151076,310829161011,310829163307)
【分类号】：U416.1
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