含水率对稳定碎石土力学特性影响的试验研究

Experimental Research on Influence of Moisture Content on Mechanical Characteristic of Stabilized Gravel Soil

稳定碎石土的力学性能与水泥用量、级配和含水率等因素有关,现阶段对于前两方面研究较多,对于含水率的研究较少。通过采用相同压实度与水泥用量的稳定碎石土,研究在不同含水率条件下其7d无侧限抗压强度与抗压回弹模量的变化规律。研究结果表明:随着含水率的增加,稳定碎石土的7d无侧限抗压强度先升高后降低,在最佳含水率附近最高。同时,随着含水率的升高,其抗压回弹模量一直减小,在最佳含水率附近减小最为明显。

The mechanical characteristic of the stabilized gravel soil is related to factors like cement content,gradation and moisture content and so on. At present,the research on the former two aspects is more,and that on the moisture content is less. The research on the change laws of 7 d unconfined compression strength and compression resistance rebound modulus under the condition of different moisture contents is made by adopting the stabilized gravel soil with the same degree of compaction and cement content. The research results show that： with the increase of moisture content,7 d unconfined compression strength of the stabilized gravel soil increases firstly and then decreases. It is the highest when closing to the optimal moisture content. Meanwhile,with the increase of moisture content,its compression resistance rebound modulus decreases all the time. It is the most obvious when closing to the optimal moisture content.