薄膜压力传感器在土工试验中的适用性初探

张紫涛; 徐添华; 徐韵; 王幼行

doi:10.11779/CJGE2017S1041

薄膜压力传感器在土工试验中的适用性初探 English Version

1. 中国水利水电科学研究院,北京 100084;
2. 深圳市市政设计研究院有限公司,广东深圳 518029;
3. 香港科技大学土木及环境工程学系,香港

基金项目: 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）

详细信息

作者简介:
张紫涛(1989-),男,博士,主要从事水利水电工程中岩土工程方面的科研工作。E-mail：zhangzt@iwhr.com。

计量
- 文章访问数: 365
- HTML全文浏览量: 2
- PDF下载量: 252
出版历程
- 收稿日期: 2016-11-27
- 发布日期: 2017-11-19

Feasibility of applying tactile pressure sensors in geotechnical tests

1. China Institute of Water Resources and Hydropower Research, Beijing 100084, China;
2. Shenzhen Municipal Design & Research Institute Co., Ltd., Shenzhen 518029, China;;
3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China

摘要

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（R²）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。
- 薄膜压力传感器 /
- 土体应力 /
- 土颗粒间作用力 /
- 标定方法
Abstract: Due to their small thickness, high flexibility and tiny sensing element, the tactile pressure sensors can be used to measure the soil stresses and contact forces between soil particles. Hence, the tactile pressure sensors have a vast application prospect in laboratory geotechnical tests. This study aims to examine the feasibility of applying the tactile pressure sensors in static and dynamic tests. First, an installation approach for the tactile pressure sensors, which relies on 3D printed sensor holders, is proposed to place the sensors in the designed locations. Second, a modified calibration method is proposed for the static tests. In this calibration method, the “equilibration” step is abandoned. A relationship between the original digital output and the applied pressure is used in the calibration. In addition, it is suggested that only the measurements from the sensors with higher values of R² are used in the analysis. Finally, for the dynamic tests, the results of the model pile tests validate the feasibility of tactile pressure sensors and suggest that the change in the digital output might imply the trend of the soils stresses.
- tactile pressure sensor /
- soil stress /
- contact force /
- calibration method

HTML全文

参考文献(12)

[1]	WANG Y H, GAO Y. Mechanisms of aging-induced modulus changes in sand with inherent fabric anisotropy[J]. J Geotech Geoenviron Eng, 2013, 139(9): 1590-1603.
[2]	GAO Y, WANG Y H, SU J C P. Mechanisms of aging induced modulus changes in sand under isotropic and anisotropic loading[J]. J Geotech Geoenviron Eng, 2013, 139(3): 470-482.
[3]	TEKSCAN. I-Scan & high speed I-Scan user manual[M]. Tekscan, Inc., 307 West First Street, South Boston, MA 02127, USA, 2009.
[4]	TEKSCAN. Comparison of interface pressure measurement options [M]. Tekscan, Inc., 307 West First Street, South Boston, MA 02127, USA, 2008.
[5]	GAO Y, WANG Y H. Calibration of tactile pressure sensors for measuring stress in soils[J]. Geotechnical Testing Journal, 2013, 36(4): 20120143, 1-7.
[6]	PALMER M C, O’ROURKE T D, OLSON N A. Tactile pressure sensors for soil-structure interaction assessment[J]. J Geotech Geoenv Eng, 2009, 135(11): 1638-1645.
[7]	ZHANG Z, WANG Y H. Examining setup mechanisms of driven piles in sand using laboratory model pile tests[J]. J Geotech Geoenviron Eng, 2015, 141(3): 04014114, 1-12.
[8]	LEHANE B M, JARDINE R J, BOND A J, et al. Mechanisms of shaft friction in sand from instrumented pile tests[J]. J Geotech Eng, 1993, 119(1): 19-35.
[9]	GAVIN K G, O’KELLY B C. Effect of friction fatigue on pile capacity in dense sand[J]. J Geotech Geoenviron Eng, 2007, 133(1): 63-71.
[10]	AIREY D W, AL-DOURI R, POULOS H G. Estimation of pile friction degradation from shear box tests[J]. Geotech Test J, 1992, 15(4): 388-392.
[11]	DEJONG J T, WHITE D J, RANDOLPH M F. Microscale observation and modeling of soil-structure interface behavior using particle image velocimetry[J]. Soils and Foundations, 2006, 46(1): 15-28.
[12]	LEHANE B M, WHITE D J. Lateral stress changes and shaft friction for model displacement piles in sand[J]. Can Geotech J, 2005, 42(4): 1039-1052.