Soil-structure interaction of an earth pressure cell

Published on Jan 8, 2011in Journal of Geotechnical and Geoenvironmental Engineering4.012
路 DOI :10.1061/(ASCE)GT.1943-5606.0000501
G. S. Wachman3
Estimated H-index: 3
(UMN: University of Minnesota),
Joseph F. Labuz32
Estimated H-index: 32
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Abstract
The output from an earth pressure cell (EPC) is usually related to the normal stress in soil through fluid calibration, where a known pressure is applied to the EPC and the output is recorded. However, distribution of normal stress within a soil is not uniform, and the EPC is not an ideal membrane鈥攂ending stiffness affects the response. These factors complicate the performance of the EPC. A calibration procedure for an EPC is reviewed, and it is shown that these controversial sensors can provide an accurate measure of average normal stress if calibrated in soil at a given density. In addition, a soil-structure interaction model is proposed to explain why soil calibration is necessary.
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References6
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This paper describes research to develop a simple laboratory calibration method for an earth pressure cell (EPC). An apparatus was designed to permit the application of loading through a soil column to the sensitive face of an EPC. Calibration tests were conducted under a variety of conditions that included loading from both fluid and earth pressure. For a diaphgram cell with a fluid filled annulus and a rigid rim, EPC output was influenced by an arching effect.
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The factors affecting stress cell measurements in soil are reviewed, evaluated and synthesized in this paper. Fifteen major factors are identified, and the method for taking into account each factor is described. Incorporating these factors will lead to better stress cell measurements through a more complete understanding of the interaction between the cell and the soil.
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Interpretation of field measurements of stress in soil using embedded gages requires proper calibration and a knowledge of the performance of the gages in soil. This paper describes an easy-to-construct and inexpensive fluid calibration chamber for soil stress gages. A suggested soil calibration facility is also described. Examples of calibration results are given to illustrate the type of information that can be obtained.
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Partial abstract: "The principal subjects of the report are the often neglected changes in the interaction of soil and pressure cells with consequent changes in relative errors in cell registrations. The report contains (a) a brief account of the development and use of soil pressure cells; (b) a review of proposed theories for soil-cell interaction; (c) a delayed account of tests with Waterways Experiment Station pressure cells placed in a large triaxial device; and (d) tentative conclusions plu...
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#1A C Tory (University of Leicester)H-Index: 1
#2R W SparrowH-Index: 1
A theoretical analysis of the effect of a flexible diaphragm on the calibration of a pressure cell subjected to one dimensional compression is presented together with the results predicted for a range of cell thickness to diameter ratios, in soils of different moduli. The likely over or under registration of a cell in a given soil can be readily obtained and, more important, the probable sensitivity of the calibration of the cell to the soil modulus is easily seen. The results are restricted to ...
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#1Mark Talesnick (Technion 鈥 Israel Institute of Technology)H-Index: 11
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A new soil pressure sensor based on a combination of the deflecting membrane and fluid filled approaches has been developed. The advantages of this combined approach are that issues of sensor compl...
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#1Renato P. de Lima (UFRPE: Universidade Federal Rural de Pernambuco)H-Index: 11
#2Thomas Keller (SLU: Swedish University of Agricultural Sciences)H-Index: 39
Abstract Knowledge of soil stress induced by vehicle traffic is a premise for assessment of soil compaction risks, but obtaining absolute values of soil stress is not trivial because stress transducer probe readings are influenced by probe characteristics and soil properties. However, little research has quantified the magnitude of the deviations between measured and 鈥渢rue鈥 stress (defined as soil stress in the absence of a probe). The objectives of this study were to use a finite element model ...
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#1Jianhua Yin (PolyU: Hong Kong Polytechnic University)H-Index: 53
#2Jie Qiong Qin (PolyU: Hong Kong Polytechnic University)H-Index: 4
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Abstract In this study, a novel effective stress cell based on fiber Bragg grating (FBG) sensing technology is developed for direct measurement of effective stress in saturated soil. The primary co...
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#1Peiyuan Lin (SYSU: Sun Yat-sen University)H-Index: 1
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Abstract Subgrade soils experience repeated traffic loads, such that dynamic stress and displacement are accumulated to jeopardize the stability of pavement foundations. Laboratory element testing is often conducted to apply cyclic loads to the soil. In fact, the stress state of subgrade soil is complex due to the constant rotation of principal stress induced by moving vehicles. It is hard to select constitutive relations for unsaturated subgrade soils in numerical or analytical calculation, sin...
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#1Ali ShafikhaniH-Index: 2
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A novel fiber-optic based earth pressure sensor (FPS) with an adjustable measurement range and high sensitivity is developed to measure earth pressures for civil infrastructures. The new FPS combines a cantilever beam with fiber Bragg grating (FBG) sensors and a flexible membrane. Compared with a traditional pressure transducer with a dual diaphragm design, the proposed FPS has a larger measurement range and shows high accuracy. The working principles, parameter design, fabrication methods, and ...
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#1K. Ahangari (IAU: Islamic Azad University)H-Index: 1
#2M. Jahandarlashaki (IAU: Islamic Azad University)H-Index: 1
Despite all efforts made to study and deal with errors induced during pressure cell measurements in soils, there is still a vast uncertainty remaining in this field. One of these errors results from the grading of the surrounding media in which the pressure cell is installed. In this study, the grain size of the cell installation media and its effects on the measurements and the results fluctuations are evaluated. For this purpose, PFC-2D software was used to numerically simulate the laboratory ...
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#1Ji-cheng Wang (ZJU: Zhejiang University)H-Index: 1
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Pressure indicated by earth pressure cell (EPC) often deviates from field earth pressure . EPC in normally consolidated soil was analysed with Taylor鈥檚 indentation method. It is found that assumes a linear relationship with soil鈥檚 compression modulus and . When preconsolidation pressure imposed on overconsolidated soil is unloaded, soil鈥檚 rebound strain is greater than EPC鈥檚, and a gap between EPC鈥檚 sensing plate and soil appears. Upon reloading, contact between sensing plate and soil resembles ...
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#1Trudeep N. Dave (Pandit Deendayal Petroleum University)H-Index: 4
#2Satyanarayana Murty Dasaka (IITB: Indian Institute of Technology Bombay)H-Index: 10
Investigation of soil鈥搒tructure interaction involves understanding of the complicated rheology and functioning of the pressure sensing devices. As earth pressure cell (EPC) output is used to interpret the stress in the soil at the point of installation of cell, experiments involving careful calibration of the pressure cells are very crucial. In view of the importance of in-soil calibration, the present study is focused on developing a relationship between the applied stress and the measured outp...
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#1Rashadul IslamH-Index: 11
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Earth pressure cell (EPC) is used to measure vertical stresses at different depths of pavement due to traffic loading. Typically, it is considered that this sensor is not affected by arching phenomenon. As the sensor is made up of steel, its stiffness is greater than the surrounding soil materials. Therefore, the sensor may report greater stress for arching action compared to the actual value. This study investigated the arching effect by finite element model (FEM) and validates the results by f...
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