路基土的力学性状试验研究与分析  

Trial Tests on the Mechanical Properties of a High Moisture Content embankment Soil

作　　者：刘飞[1,2] 姚燕雅[2] 戴大方[2] 胡媛媛[2] 

机构地区：[1]无锡环境科学与工程研究中心,江苏无锡214000 [2]无锡城市职业技术学院,江苏无锡214000

出　　处：《土工基础》2014年第6期96-98,共3页Soil Engineering and Foundation

基　　金：无锡城市职业技术学院重点课题(No.WXCY-2012-004)

摘　　要：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。The properties of the high moisture content embankment soil is studied through the trial tests. The filling embank ment constructiou is pilot studied and the performance of the high moisture content embankment soils are summarized in the pa- per. The results indicate that, for the first phase of the embankment, the filling rate has limited impact on the performance of the embankment soils; the fast filled embankment will have a relatively slow dissipation of the excessive pore pressure in the embankment. From the second filling, the accumulation of the high pore pressure and its slow dissipation will result in a large deformation in the embankment. Therefore, a high degree of consolidation is hard to be reached within a short period of time. An appropriate filling rate is necessary for the high water content and relatively large permeability embankment soils so that the consolidation time required for the underlying soils can be reduced.

关 键 词：路基土 变形 应力路径 固结度 

分 类 号：TU411[建筑科学—岩土工程]