灰岩质粗粒土侧限压缩试验研究

Study on Confined Compression Test of Coarse-grained Limestone Soil

以灰岩质粗粒土为研究对象,在95%压实度和最优含水率下进行不同粗粒含量的侧限压缩试验。通过分析P5含量与P2-5含量与沉降量、压缩模量、孔隙比的关系曲线来研究P5含量和P2-5含量对工程特性的影响。结果发现:在P5含量小于55%时,压缩模量随P5含量的增加缓慢增加,孔隙比随P5含量的增加逐渐减小;当P5含量介于55%和80%之间时,压缩模量随P5含量的增加迅速增大,而孔隙比几乎不随P5含量变化;当P5含量大于80%时,压缩模量随P5含量的增加而变化不大,孔隙比随P5含量增加迅速增大;当P5含量介于60%~70%,且P5含量不变时,随着P2-5含量增加,使得骨架效应增强,E s呈现明显增大现象。P5含量在一定范围内对灰岩质粗粒土的工程特性起主导作用。

Taking the coarse-grained limestone soil as the research object,this paper carries out the confined compression test for limestone soil with different coarse-grain content under 95%compaction and optimal moisture content,and studies the effects of P5 content and P2-5 content on engineering characteristics by analyzing the relationship curve between P5 content and P2-5 content and sedimentation,compression modulus and void ratio.The results show that:when the P5 content is less than 55%,the compression modulus increases slowly and the void ratio decreases with the increase of P5 content;when the P5 content is between 55%and 80%,the compression modulus increases rapidly and the void ratio almost doesn’t change with the increase of P5 content;when P5 content is more than 80%,the compression modulus changes slightly and the void ratio increases rapidly with the increase of P5 content;with the increase of P2-5 content,the skeleton effect is enhanced and E s is obviously increased when P5 content is constant between 60%and 70%.The P5 content plays a leading role in the engineering characteristics of coarse-grained limestone soil within a certain range.