冻融作用下PPF稳定土力学性能研究  

Study of the mechanical properties of stabilized soil containing PPF under freezing and thawing cycles

作　　者：刘雨彤[1] 杨林[1] LIU Yutong;YANG Lin(School of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040

出　　处：《冰川冻土》2017年第4期850-857,共8页Journal of Glaciology and Geocryology

基　　金：黑龙江省交通运输厅科技项目(20101018)资助

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。In order to study the mechanical properties of stabilized soil under freezing and thawing cycles, in this paper, low-dose cement lime stabilized soil that reinforced with a kind of domestic soil curing agent （ TG curing agent） is taken as the object of research, the mechanical properties of the soils with different compaction degree and polypropylene fiber （PPF） content were studied by unconfined compressive strength test, splitting strength test and compressive resilience modulus test before and after freezing-thawing cycles. The results show that the compressive strength, the splitting strength and the compressive resilience modulus of the stabilized soil decrease with freezing-thawing cycles, and after six cycles, the loss rate of strength and modulus were basically stable. Before and after freezing-thawing cycles, the compressive strength, splitting strength, compressive modulus of resilience, residual percentage of strength and modulus of the stabilized soil increased with compaction degree and PPF content. Combined with the actual situation of the engineering practice, the freezing and thawing experi- ment was carded out with 95% compaction degree and 0.2% PPF comprehensive stability soil and obtained the residual ratio of the compressive strength of 59.32% and the rate of mass change of 6.28% only. This study shows that the stabilized soil containing PPF has excellent stability against freezing and can be used as the base material of pavement.

关 键 词：道路工程 冻融循环 TG固化剂 聚丙烯纤维 力学性能 

分 类 号：U416.212[交通运输工程—道路与铁道工程]