摘要
基于超声波测试理论,利用非金属声波检测仪,对干湿循环后的压实膨胀土进行了声波测试,分析了纵波波速随干湿循环次数和初始(控制)含水率的变化规律。研究结果表明:膨胀土纵波波速随循环次数的增加呈非线性衰减;控制含水率越大,纵波波速越大;在控制含水率一定的条件下,纵波波速随裂隙率的增加而逐渐减小。通过分析试验数据,得到了干湿循环作用下加权平均纵波速度变化的经验公式,以估算干湿循环作用下膨胀土的声波速度,为研究膨胀土的声学特征提供了参考和借鉴。
Based on ultrasonic testing theory, the sound wave test of compacted expan- sive soil after wetting and drying cycles was carried out using the non-metallic sound wave detector,and the variation law of the initial （control） moisture content was ana- lyzed.The results show that the expansive soil longitudinal wave velocity decreases non- linearly with the increase of the number of cycles, controlled rate increases with the moisture content,P-wave velocity is high.In order to control the moisture content in cer- tain conditions, P-wave velocity along the fracture rate increased gradually. By analyzing the test data, empirical formula of the weighted average value of the P-wave velocity changes under wet and dry cycles can be used for the estimation of the effect of wet and dry cycling expansion on the acoustic wave velocity of the soil,as the expansion of the acoustic characteristics of the soil to be provided as a reference.
出处
《交通科学与工程》
2016年第3期30-34,共5页
Journal of Transport Science and Engineering
关键词
道路工程
膨胀土
干湿循环试验
变化规律
纵波波速
road engineering
expansive soil
wet and dry cycles experiment
change law
acoustic velocity
