土压力盒测粗粒土K0的影响因素分析

研究土压力盒测粗粒土静止土压力系数K0的试验中,大型压缩试验每级荷载合适的加载时间,以及充填料对试验的影响。对长河坝覆盖层料进行小型压缩试验,分析沉降与时间的关系;并确定压缩试验中,每级压力下沉降稳定需要的时间。结果表明:当压力较小时,沉降稳定较快;当压力较大时,沉降稳定较慢。试样密度较大时,沉降稳定时间较短;试验密度较小时,沉降稳定时间较长。在土压力盒受力面分别采用砂包覆盖、细料覆盖两种方式的情况下,对埋置土压力盒的长河坝覆盖层料进行大型单向压缩试验,研究充填料对土压力盒测量的影响。结果表明:充填料的选择对计算静止侧压力系数有较大影响,当选择2~5 mm砾石作为充填料时,能测得较为接近实际的静止侧压力系数。

Research of coarse-grained soil on Experimental study and estimation method of at-rest lateral pressure coefficient

researching the loading time of Each level of load appropriate to large uniaxial compression test, and the effects which filling material make on ascertaining at-rest lateral pressure coefficient of coarse-grained soil by soil pressure box. Making small compression test on overburden of core-rockfill dam, analyzing the relation between the settlement and time, and ascertain the required settlement stability time per level pressure in compression test . The results show that, when the pressure is small, settlement is rapid to be stable, when the pressure become bigger, settlement become more slow to be stable; when the density is large, settlement is slow to be stable, when the density become smaller, settlement become more rapid to be stable. In the condition that the stress surface of soil pressure box respectively be covered by sand cover and fine material covering , Making large uniaxial compression test on overburden of core-rockfill dam which Contain soil pressure box, to analyse the effects which filling material make on the measurement results of soil pressure box. The results show that, the choice of filling material has significant impact on