论文部分内容阅读
通过应力控制仪,对高含水率土进行路基填筑过程模拟试验,研究路基下土的力学性状变化规律。通过试验分析得出:路基填筑速度对第一填筑过程影响较小,在相同的时间内不同的路基填筑速度下,路基下土的变形、孔隙水压力增长以及应力路径的变化不明显;但由于在停载排水固结过程中,快速填筑造成土中孔隙水压力消散过慢,使得从第二阶段路基填筑开始,孔隙水压力较高并且消散过慢,使得路基下土的变形量过大,在较短时间内难以获得较高的固结度。因此,对于含水率较高、渗透系数较大的软土路基填筑来说,需要合理选择路基填筑速度,从而缩短路基下土的排水固结时间,保证工程安全迅速的进行。
Through the stress control instrument, simulating test of embankment filling process of high water content soil is carried out to study the variation rule of soil mechanical properties under subgrade. The experimental results show that the subgrade filling speed has little effect on the first filling process. Under the same subgrade filling speed, the subgrade deformation, the increase of pore water pressure and the change of stress path are not obvious However, due to the slow filling of pore water pressure in the soil due to rapid filling during the process of loading and unloading drainage consolidation, the pore water pressure is relatively high and dissipates slowly from the second stage subgrade filling, so that the soil under the subgrade Deformation is too large, it is difficult to obtain a higher degree of consolidation in a short period of time. Therefore, for soft soil embankment with high moisture content and large permeability coefficient, it is necessary to select the embankment filling speed rationally, so as to shorten the drainage consolidation time of the soil under the embankment and ensure the safety and rapidity of the project.