TG固化土经冻融作用的变形与力学特性研究

为使TG固化剂石灰土能更好的应用于东北等季冻区二级及二级以下公路的底基层,通过室内试验研究得到TG固化剂石灰土的合理配比,以代表强度与变形特性的典型试验为依据,对TG固化剂石灰土的变形与力学特性受冻融作用的影响规律进行详细探究。研究结果表明:力学特性方面,经历冻融循环作用以后,TG固化剂石灰土的无侧限抗压强度降低,随着冻融循环次数的增加最大损失率不超过50%;抗压回弹模量随含水率增加而减小,随压实度增大而增大,在经历冻融循环作用后抗压回弹模量降低。变形特性方面,经历冻融循环作用后干缩性能有提高,且压实度越小,干缩应变越大。冻融循环作用对TG固化剂石灰土的强度与变形特性有双重效应。

The Research of TG Solidified Soil Deformation and Mechanical Properties after Freeze-thaw Action

To let TG curing agent calcareous soil be better applied in subbase of secondary and below highway in northeast China season frozen zone,the reasonable proportion of TG curing agent calcareous soil was obtained by laboratory experimental study, and according to the typical experimental represented by strength and deformation characteristics, the influence law of TG solidified soil deformation and mechanical properties after freeze-thaw action was researched in detail. The result showed that, in mechanical properties, after freeze-thaw cycles action, the unconfined compressive strength of TG curing agent calcareous soil was decreased, and the max loss was less than 50% with the increase of freeze-thaw cycles number; the compression modulus of resilience was decreased with the increase of water content, increased with the increase of compactness, while after freeze-thaw cycles action, the compression modulus of resilience was decreased. In deformation properties, after freeze-thaw cycles action, thedrying shrinkage performance was increased, and the smaller the compactness, the greater the drying shrinkage performance. In general, the freeze-thaw cycles action had an double effects on strength and deformation characteristics of TG curing agent calcareous soil.