薄膜压力传感器在土工试验中的适用性初探

发布时间：2018-01-08 15:23

本文关键词：薄膜压力传感器在土工试验中的适用性初探　出处：《岩土工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：薄膜压力传感器因其厚度小、柔软、测压单元面积小等特点,可准确测量土体应力及土颗粒间作用力,因而在土工试验中有着广阔的应用前景。初步探究了薄膜压力传感器在静力和动力土工试验中的适用性。首先,提供了结合3D打印技术,将薄膜压力传感器安装于土体内部设定位置上测量相应土体应力及颗粒间作用力的方法。其次,提出了测量静力时直接建立初始DO值与施加压强值间函数关系的标定方法,并建议选用拟合优度判定系数(R~2)判定测压单元表现的优劣。最后,结合模型桩试验,验证了在动力试验中通过薄膜压力传感器、利用初始DO值可大体了解土体应力在动力荷载下的变化趋势。
[Abstract]:Because of its small thickness, soft and small area of pressure measuring unit, thin film pressure sensor can accurately measure soil stress and interaction force between soil particles. Therefore, there is a broad application prospect in geotechnical tests. The applicability of membrane pressure sensors in static and dynamic geotechnical tests is preliminarily explored. Firstly, 3D printing technology is provided. The method of measuring the corresponding soil stress and the interaction force between particles by installing the film pressure sensor on the set position of the soil. Secondly. The calibration method of establishing the function relationship between the initial do value and the applied pressure value directly when measuring static force is put forward, and it is suggested that the coefficient of goodness of fit (Ru 2) be selected to judge the performance of the pressure measuring unit. Finally. Combined with the model pile test, it is verified that the change trend of soil stress under dynamic load can be roughly understood by using the initial do value through the membrane pressure sensor in the dynamic test.
【作者单位】：中国水利水电科学研究院;深圳市市政设计研究院有限公司;香港科技大学土木及环境工程学系;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2014CB046802) 中国水利水电科学研究院基本科研业务费专项项目(GE0145B102017)
【分类号】：TU41
【正文快照】： 3.香港科技大学土木及环境工程学系,香港)测量土体中的应力(下文中简称土体应力,区别于土体与结构物接触面的应力)有助于我们更好地理解土体特性。然而,这一看似简单的需求在土工试验中却极难实现。其原因在于,目前在各类土工试验中广泛采用的传统压力传感器(例如,图1所示的内

【相似文献】