石灰改良膨胀土重塑后的工程特性研究

Study on engineering characteristics of lime-treated expansive soil after remolding

为研究石灰改良膨胀土重塑后的工程特性,进行了素土、石灰改良膨胀土及重塑石灰改良膨胀土在90%、93%及95%压实度下土体的固结试验及直剪强度试验,对比分析了3种土体的工程特性。试验结论显示:重塑石灰改良膨胀土的压缩系数α1-2介于素土与石灰改良膨胀土之间,是石灰改良膨胀土的1.6~1.7倍,是素土的0.7~0.8倍。在上覆荷载较小时,重塑石灰改良膨胀土的抗剪强度及压缩性能接近于素土;在上覆荷载较大时,重塑石灰改良膨胀土的抗剪强度及压缩性能接近于石灰改良膨胀土。

In order to study the engineering characteristics of lime-treated expansive soil, the compression and direct shear strength tests of plain soil, remolded lime-treated expansive soil and lime-treated expansive soil were carried out under the three compactions of 90%,93% and 95%.The engineering characteristics of the three kinds of soil were compared and analyzed.The test results show that the compression coefficient of remolded lime-treated expansive soil is between plain soil and lime-treated expansive soil, which is 1.6~1.7 times higher than that of lime-treated expansive soil, and 0.7~0.8 times lower than that of plain soil.When the overburden pressure is small, the shear strength and compression performance of remolded lime-treated expansive soil are close to that of the plain soil.When the overburden pressure is large, the shear strength and compression performance of remolded lime-treated expansive soil is close to that of the lime-treated expansive soil.