土工格栅户外老化试验初步研究

发布时间：2018-03-14 17:03

本文选题：土工格栅　切入点：HDPE　出处：《长江科学院院报》2017年02期 　论文类型：期刊论文

【摘要】：作为一类特殊的高分子材料,土工合成材料越来越广泛地应用于水利、交通、环境工程等各个领域。在其服役期限内,能否保持一定的力学性能对整个工程的稳定性至关重要。研究高分子土工合成材料的老化性状,从而准确预测土工合成材料在各种环境条件下的使用寿命,已成为目前岩土工程的研究热点之一。在长江科学院土工合成材料户外老化试验基地开展了HDPE土工格栅的户外光氧老化试验。试验结果表明:在9个月内,土工格栅的拉伸强度基本保持不变甚至还有增高的趋势,这可能是由于高分子内部的二级反应补偿了紫外线的老化。紫外线提供了化学交联所需的能量,使得聚合物分子发生交联反应,轻微的收缩导致织物纤维被拉紧,使强度增大。这使得土工格栅强度在前期(9个月)得到一定程度的改善。9个月后,强度开始降低。本老化试验基地的远期研究成果可提供长时序土工合成材料老化性能物理力学指标的第一手资料。
[Abstract]:As a special kind of polymer materials, geosynthetics are more and more widely used in water conservancy, transportation, environmental engineering and other fields. Whether the mechanical properties can be maintained is very important to the stability of the whole project. The aging behavior of polymer geosynthetics is studied to predict the service life of geosynthetics under various environmental conditions. It has become one of the research hotspots in geotechnical engineering at present. The outdoor photo-oxygen aging test of HDPE geogrid has been carried out in the outdoor aging test base of geosynthetics of the Yangtze Academy of Sciences. The results show that: within 9 months, The tensile strength of the geogrid remains basically unchanged or even tends to increase, possibly because the second-order reaction within the polymer compensates for the aging of the ultraviolet ray, which provides the energy needed for chemical crosslinking. The crosslinking reaction takes place in the polymer molecules, and the slight shrinkage results in the fabric fiber being strained and the strength increases. This results in a certain improvement in the geogrid strength in the early stage (9 months). After 9 months, the geogrid strength is improved to a certain extent. The long-term research results of this aging test base can provide first-hand information on the physical and mechanical properties of long time series geosynthetics.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;
【基金】：“十二五”国家科技支撑计划课题项目(2015BAB07B04) 中央级公益性科研院所基本科研业务费项目(CKSF2014060/YT,CKSF2016044/YT) 水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK914023)
【分类号】：TU53

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