摘要
膨胀土的膨胀力导致的工程事故是迄今为止尚未解决的世界性技术难题之一,膨胀力作为评价膨胀土力学性质的重要指标之一,提高其测量的准确性具有重要意义。文中研制了一种无扰动、可控制饱和的膨胀力测试仪器,克服了传统方法中难以严格控制试样饱和、在反复的压缩和膨胀过程中体积不能保持恒定而导致的试样扰动和测试过程复杂等缺点。研制的新型膨胀压力测试仪器具有可主动控制饱和、能严格控制体积恒定、测试耗时少、结构简单、操作方便和数据可靠等特点。通过新型膨胀力测试仪进行了膨胀力的测试验证和分析,结果表明:在相同干密度条件下,膨胀土的最大膨胀力随初始含水量的增加而降低,膨胀土的最大膨胀力随初始含水量呈幂函数相关关系。
Engineering accident caused by the expansive force of expansive soil is one of the worldwide technical problems which have not been solved in the field of geotechnical engineering. As one of the im portant evaluation indexes of expansion soil mechanics properties, it is significant to improve the accura cy of the expansive force measurement. In this paper, a kind of expansion force testing instrument which can control the saturation of sample and protect sample from disturbance has been developed. It is diffi cult to strictly control the saturation of the sample with traditional methods and it＇ s hard to protect sam ple from disturbance for the reason that traditional methods can hardly maintain a constant volume in the repeated process of expansioncompression. What＇ s more, the testing process of traditional methods iscomplex. In spite of all the difficulties, the new expansion force testing instrument overcomes all these shortcomings. It get a series of advantages including active saturationcontrol, strict constantvolumecon trol,less time consuming, simple structure, convenient operation and reliable data etc. Test and analysis of expansion force has been done with the help of the new expansion force testing instrument. It turns out that at the condition of the same dry density, the maximum expansive force decreased with the increasing of the initial moisture content and there＇ s a power function relationship between the maximum expansive force and the initial moisture content.
出处
《西安科技大学学报》
CAS
2013年第6期674-679,共6页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金资助项目(No.11072193)
陕西省教育厅科学研究计划项目(No.12JK0907)
关键词
膨胀土
膨胀力
测试仪器
测试原理
含水量
expansive soil
expansive force
testing instrument
testing principle
moisture content
