东鱼河道堤防粉质壤土蠕变力学特性试验研究

Experimental Study on Creep Mechanical Properties of Silty Loam in Dongyu RiverEmbankment

为研究东鱼河道济宁段堤防粉质壤土蠕变力学特征,设计开展了粉质壤土的含水率、压实度以及地聚物掺量三因素影响下蠕变试验,基于蠕变试验结果开展了蠕变力学特性分析。试验结果表明,各级荷载下蠕变曲线均为“倒L”形,且不受三因素影响;蠕变荷载愈大,蠕变值以及荷载施加初期递增时间均愈大。含水率愈大,试样蠕变特征值愈小,抗蠕变损伤能力愈弱。提高试样压实度后,包括蠕变速率以及初期递增时间在内的蠕变特征值均减小,控制试样压实度有助于增强抗恒定荷载破坏能力。增大改性剂掺量,蠕变值、蠕变速率等均减小,尤以掺量0.5%~1%下影响效应更为显著,而掺量1.25%~1.5%下影响逐步减弱;试验表明控制改性剂掺量在1%左右更为合理。本研究可为粉质壤土蠕变力学研究及蠕变试验设计提供参考。

In order to study the creep mechanical characteristics of silty loam in Jining section of Dongyu River embankment,the creep experiments of silty loam under the influence of moisture content,compactness and geopolymer content were designed and carried out,and the creep mechanical characteristics were analyzed based on the creep experiment results.The results showed that the creep curves under various loads were"inverted L"and not affected by the three factors;the larger the creep load,the larger the creep value and the initial increment time of the load.The larger the moisture content,the smaller the creep characteristic value of the specimen,and the weaker the creep damage resistance.When the compactness of the specimen was increased,the creep characteristic values including the creep rate and the initial increasing time were reduced.Controlling the compactness of the specimen was helpful to enhance the resistance to constant load damage.The creep value and creep rate decreased with increasing the content of modifier,especially when the content was 0.5%~1%,the effect was more significant,while the effect was gradually weakened when the content was 1.25%~1.5%;the experiment showed that it was more reasonable to control the content of modifier at about 1%.This paper can provide reference for the study of creep mechanics and experiment design of silty loam.