Tactile Pressure Sensors in Centrifuge Testing
Tactile Pressure Sensors in Centrifuge Testing
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DOI：
10.1520/gtj20120061
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发表时间：
2014-01-01
影响因子：
1.6
通讯作者：
Sasanakul, Inthuorn
中科院分区：
文献类型：
--
作者：
El Ganainy, Hesham;Tessari, Anthony;Sasanakul, Inthuorn
竖向土压力和侧向土压力的计算是岩土工程和地基基础工程中的重要内容。在假定地应力条件下，垂直应力很容易计算.然而，表征侧土压力主要是基于判断和经验相关性，假设侧土压力系数基于土壤的抗剪强度参数。超固结、地质年代和预振等因素对侧向土压力大小和分布的影响很难仅使用文献中的经验相关性进行评估。直接测量的横向土压力，在现场，全尺寸和离心模型，需要充分表征这些因素。本文讨论了在离心模型中使用基于网格的触觉压力传感器来研究超固结和预振对侧土压力的影响。详细讨论了一种新的触觉传感器的制备和校准方法。一系列的五个离心试验进行了正常固结，超固结，和预振存款使用干砂和饱和砂。绘制了实测土压力分布图并进行了评价。给出了在离心机实验中使用触觉传感器的注意事项和建议。
Assessing vertical and lateral earth pressure is important in geotechnical and foundation engineering. Vertical stresses are easy to calculate assuming a geostatic stress condition. However, characterizing the lateral earth pressure is primarily based on judgment and empirical correlations that assume a lateral earth pressure coefficient based on the shear strength parameters of the soil. Effects of factors such as overconsolidation, geologic age, and pre-shaking on the lateral earth pressure magnitude and distribution are difficult to assess using only the empirical correlations found in literature. Direct measurements of the lateral earth pressure in the field, full-scale, and centrifuge models are required to fully characterize these factors. This paper discusses the use of grid-based tactile pressure sensors in centrifuge models to study the effects of overconsolidation and pre-shaking on the lateral earth pressure. A new preparation and calibration procedure for the tactile sensors is discussed in detail. A series of five centrifuge tests were performed using dry and saturated sand in normally consolidated, overconsolidated, and pre-shaken deposits. The measured lateral earth pressure distributions are plotted and evaluated. Precautions and recommendations for the use of tactile sensors in centrifuge experiments are given.