一种新型土壤抗剪强度测量装置的研制

摘要

Soil shear strength is an important physical performance of rock and soil ,and the soil shear strength measurements has an important significance in monitoring and prevention for landslide hazard point .A device was presented for field measurement on soil shear strength , The device consists of cross board , torque sensor , stepper motor , single-chip hardware circuit and other components .The construction of experimental apparatus and the single chip microcomputer hardware circuit are introduced in detail .Sampling the soft clay in Hangzhou as the research ob-ject, the vane shear test and direct shear test under the condition of different moisture content and different stress has been done , and done the analysis and comparison of the experiment data .The experimental results show that when soil moisture content is low , with the increase of moisture content ,soil shear strength first increases then de-creases ,and soil shear strength and normal stress applied on the soil is directly proportional relationship .%土的抗剪强度是岩土体一项重要的物理性能指标，测量土的抗剪强度对于滑坡隐患点的监测和预防具有重要意义。提出一种装置来实现现场测量土的抗剪强度，该装置由十字板、扭矩传感器、步进电机、单片机硬件电路等结构组成。对实验装置的搭建和单片机硬件电路作了详细介绍。取杭州地区的软黏土为研究对象，用该装置对土样在不同含水率和不同正应力的条件下进行了十字板剪切试验和直剪试验；并将所得数据的数据进行分析对比。试验结果表明，当土壤含水率较低时，随着含水率的增加，土壤抗剪强度先增大后减小；而土壤抗剪强度和对土壤施加的正应力是成正比关系的。