石灰掺量对分散性土工程性质的时效影响分析

为研究不同石灰掺量和龄期对新疆某地分散性土长期力学性能的影响,通过改性研究和力学性质试验,探讨不同石灰掺量和龄期下改性土的变形与强度变化规律。结果表明：随石灰掺量增加,分散性抑制效果越好,最大干密度逐渐降低,内摩擦角增大,黏聚力和无侧限抗压强度先增大后减小,压缩系数先减小后增大,最后趋于稳定；随龄期延长,压缩系数减小,黏聚力、内摩擦角和无侧限抗压强度增大。当石灰掺量为3%时,分散性土改性为非分散性土,无侧限抗压强度达到峰值,龄期为3d、28d时,其强度提高48.24%、252.74%；当掺量为5%时,黏聚力取得极大值,龄期3d和28d的改性土黏聚力分别增加14.67%、50.05%。龄期越长,强度越高,改性土越脆,适应变形能力减弱。

Analysis of the aging effect of lime content on the engineering properties of dispersive soils

In order to study the influence of different lime content and age on the long-term mechanical properties of dispersive soil in Xinjiang, the deformation and strength of modified soil under different lime content and age were discussed by modification research and mechanical property test. The results show that with the increase of lime content, the dispersion inhibition effect is better, the maximum dry density decreases gradually, the internal friction angle increases, the cohesion and unconfined compressive strength increase first and then decrease, and the compression coefficient decreases first and then increases, and finally tends to be stable; With the extension of age, the compression coefficient decreases, and the cohesion, internal friction angle and unconfined compressive strength increase. When the lime content is 3 %, the dispersive soil is modified to non-dispersive soil, and the unconfined compressive strength reaches the peak, When the age is 3d and 28d, the strength increases by 48.24 % and 252.74 % ; when the content is 5 %, the cohesion reaches the maximum value. The cohesion of modified soil at 3d and 28d increased by 14.67 % and 50.05 % respectively. The longer the age, the higher the strength, the more brittle the modified soil, and the weaker the ability to adapt to deformation.