冻融作用下PPF稳定土力学性能研究

发布时间：2018-04-17 07:29

本文选题：道路工程 + 冻融循环　；参考：《冰川冻土》2017年04期

【摘要】：为了研究冻融作用下外加材料稳定土的力学性能,以一种国产土壤固化剂(TG固化剂)加固低剂量水泥石灰稳定土为研究对象,通过冻融前后的无侧限抗压强度试验、劈裂强度试验和抗压回弹模量试验,研究不同压实度、聚丙烯纤维(PPF)掺量稳定土的力学性能。结果表明:稳定土的抗压强度、劈裂强度及回弹模量均随冻融次数的增加而降低,经历6次冻融循环后,强度、模量损失率基本稳定。冻融前后稳定土的抗压强度、劈裂强度、抗压回弹模量以及强度、模量的残留百分比均随着压实度和PPF掺量的提高而增大。结合工程实际情况,选取压实度为95%,0.2%PPF综合稳定土进行冻融试验,得到抗压强度残留比(BDR)达到59.32%,质量变化率仅为6.28%,研究表明,PPF综合稳定土具有优良的冻稳定性,可用作路面基层材料。
[Abstract]:In order to study the mechanical properties of stabilized soil with added materials under freezing and thawing, a kind of domestic soil curing agent (TG) was used to reinforce low dose cement lime stabilized soil. The unconfined compressive strength test was carried out before and after freezing and thawing.The mechanical properties of PPF-based stabilized soils with different compaction degrees were studied by splitting strength test and compression resilience modulus test.The results show that the compressive strength, splitting strength and springback modulus of the stabilized soil decrease with the increase of freeze-thaw times. After six freeze-thaw cycles, the loss rate of strength and modulus is basically stable.The compressive strength, splitting strength, compressive resilience modulus and residual percentage of modulus and modulus of the stabilized soil increased with the increase of compaction degree and PPF content before and after freezing and thawing.According to the actual situation of the project, the frozen and thawing test of the composite stable soil with a compaction degree of 95% and 0.2% PPF has been carried out. The results show that the compressive strength and residual ratio (BDRR) is 59.32 and the quality change rate is only 6.28. The research shows that the PPF comprehensive stabilized soil has excellent frozen stability.It can be used as pavement base material.
【作者单位】：东北林业大学土木工程学院;
【基金】：黑龙江省交通运输厅科技项目(20101018)资助
【分类号】：U414

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