炭质泥岩填料静止侧压力系数试验研究

An Experimental Study of Static Pressure Coefficients of Carbonaceous Mudstone

为了查明密实度、含水率、颗粒级配的改变对炭质泥岩填料作用于路堤结构物上的静止土压力大小的影响,本文研究了干密度、含水率、颗粒级配对炭质泥岩填料的静止侧压力系数的特性影响,采用GJY型K_0固结仪进行炭质泥岩填料的静止侧压力系数试验.设置4种干密度,5种含水率,5种颗粒级配探究炭质泥岩填料的静止侧压力系数的变化规律.研究结果表明:炭质泥岩填料的干密度越大,竖向变形越小,静止侧压力系数越小.随着含水率的增加,静止侧压力系数先减小后增大,其中含水率为6%时静止侧压力系数最小,随着颗粒级配的增加,静止侧压力系数也是先减小后增大,其中颗粒级配3的静止侧压力系数最小.研究结果可为以炭质泥岩作为填料的工程提供一定参考依据.

In order to find out what effects changing density, moisture content and particle size distribution have on the earth pressure at rest of embankment structure in which the carbonaceous mudstone is the filler, we studied what effects dry density, moisture content and particle size distribution would have on the character of the pressure coefficient at rest of carbonaceous mud stone filler, and we chose the K0 consolidation apparatus of GJY type to test the pressure coefficient at rest of the carbonaceous mudstone filler. To explore the changing rules of the pressure coefficient at rest of carbonaceous mud stone filler, we set four dry densities, five moisture contents and five particle size distributions. Results showed that the denser the dry density of carbonaceous mudstone was, the smaller the vertical deformation was, and the smaller the pressure coefficient at rest was. With the increase of moisture content, the pressure coefficient at rest increased at first, but then decreased gradually; when the moisture was 6%, the pressure coefficient at rest reached its minimum. With the increase of the particle size distribution, the pressure coefficient at rest showed the same result as-the moisture content; when the particle size distribution was 3, the pressure coefficient at rest reached its minimum. Therefore, these results provide important references for the projects in which the carbonaceous mudstone is the filler.