岩土力学Issue(3)：710-716,7.
分级连续加载条件下原状膨胀土固结变形研究
Study of consolidation deformation of intact expansive soil under stage continuous loading conditions
摘要
Abstract
Based on the relationship among the coefficient of consolidation Cv, effective stress and void ratio, the equations considering the variation of Cv for consolidation under stage continuous loading are derived. According to analytical solutions of the above equations, a formula for settlement calculation under stage continuous loading is obtained. Combined with the construction of Yun-Gui high-speed railway, taking the stage loading of high embankment as the object of study, stage continuous loading oedometer test of intact expansive soil are carried out on geotechnical digital systems (GDS) triaxial apparatus. It is confirmed that the relationship between settlement and time can be fitted with broken line in loading stage and hyperbola in steady stage. The stress-strain curves of expansive soil can be described with ladder. The coefficient of consolidation increases firstly and then decreases with effective stress when ≤c;however, it decreases continuously as wave while >c The calculated values of degree of consolidation are compared with test results. It is found that the degree of consolidation calculated by considering the variation of Cv is more accurate than constant Cv. The formula for settlement calculation under stage continuous loading can be used as a reference method to analyze the relationship between settlement and time of subgrade for high-speed railway.关键词
分级连续加载/固结系数/原状膨胀土/固结度Key words
stage continuous loading/coefficient of consolidation/intact expansive soil/degree of consolidation分类
建筑与水利引用本文复制引用
陈伟志,蒋关鲁,王智猛,李安洪..分级连续加载条件下原状膨胀土固结变形研究[J].岩土力学,2014,(3):710-716,7.基金项目
铁道部科技研究开发计划项目（No.2010G003-F）。 （）
