THE COLLAPSE AND CREEP BEHAVIOR OF KAOLIN WITH DOUBLE POROSITY STRUCTURE

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BAGHERIEH A.R.; FARPOUR R.; FARSIJANI A.

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:5 (SUPPLEMENT) Page(s): 11-20

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Title

THE COLLAPSE AND CREEP BEHAVIOR OF KAOLIN WITH DOUBLE POROSITY STRUCTURE

Author(s)

BAGHERIEH A.R. | FARPOUR R. | FARSIJANI A. | Issue Writer Certificate

Keywords

SECONDARY CONSOLIDATIONQ2

DOUBLE POROSITYQ2

COLLAPSEQ2

MERCURY INTRUSIONQ2

Abstract

Despite several existing researches on the SECONDARY CONSOLIDATION of fine grained soils, there is no consensus among researchers about the main reasons for variations of the coefficient of SECONDARY CONSOLIDATION versus stress. The present research specifically aims to discuss the general trend of this parameter in soils with DOUBLE POROSITY structure. This paper studies the commercial kaolin. After adding the required moisture to the soil and allowing the moisture equalization, samples of kaolin are statically compacted into the desired dry density. The density of the compacted kaolin is considered to be low enough to obtain an initial open and DOUBLE POROSITY structure. In order to make sure about the compaction procedure -as well as the existence of DOUBLE POROSITY structure, prosimetry experiments including MERCURY INTRUSION and BET experiments are carried out. The results of prosimetry experiments confirm the existence of DOUBLE POROSITY structure in the samples. Furthermore the results of water retention analysis of soil prove the DOUBLE POROSITY structure of compacted soil samples. The water retention curves show a stepwise trend which is a consequence of bimodal distribution of pore size. Moreover, the water retention curves show that the structure changes into single structure at high vertical stresses. In other words, the vertical stress causes the closure of macro pores. For further investigations, samples are put in conventional oedometer apparatus. Saturation is carried out in two ways: the first group of samples are saturated before being loaded; In the second group, the samples are initially loaded at compaction water content and then are saturated under a constant load. The results indicate that the history of stress before the COLLAPSE, transposition of loading and saturation processes does not affect the porosity of the samples after saturation (Collapse upon wetting). In other words the porosity after COLLAPSE is only related to the effective stress at saturation state. This may validate the idea which states “normal consolidation line of saturated samples is a unique line and is not substantially dependent on the stress path and history”. This idea simplifies the procedure of modeling the behavior of collapsible soils. Over a long period of time required for measuring the secondary changes in soil volume, the samples are put under a constant load, and the amount of settlement versus time is measured after the completion of primary consolidation. The coefficient of SECONDARY CONSOLIDATION is reported for all states of vertical stresses. Recorded experimental results show that in the stress range of 100 to around 300 kPa, the coefficient of SECONDARY CONSOLIDATION exhibits an increasing trend with respect to stress; where it reaches its maximum at 300 kPa and starts its descending trend. This is in compliance with the same results of earlier researches. Consequently, given that the soil studied in earlier researches has been of single porosity structure, present research shows that the DOUBLE POROSITY structure does not considerably affect the general trend of changes in SECONDARY CONSOLIDATION coefficient. Furthermore this is in contrast with some theories that express the relation between the secondary deformations and DOUBLE POROSITY structure of soil. Therefore, it could be stated that it is required to clarify the reasons of secondary deformations of soils more precisely.

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APA: Copy

BAGHERIEH, A.R., FARPOUR, R., & FARSIJANI, A.. (2016). THE COLLAPSE AND CREEP BEHAVIOR OF KAOLIN WITH DOUBLE POROSITY STRUCTURE. MODARES CIVIL ENGINEERING JOURNAL, 16(5 (SUPPLEMENT)), 11-20. SID. https://sid.ir/paper/256703/en

Vancouver: Copy

BAGHERIEH A.R., FARPOUR R., FARSIJANI A.. THE COLLAPSE AND CREEP BEHAVIOR OF KAOLIN WITH DOUBLE POROSITY STRUCTURE. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(5 (SUPPLEMENT)):11-20. Available from: https://sid.ir/paper/256703/en

IEEE: Copy

A.R. BAGHERIEH, R. FARPOUR, and A. FARSIJANI, “THE COLLAPSE AND CREEP BEHAVIOR OF KAOLIN WITH DOUBLE POROSITY STRUCTURE,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 5 (SUPPLEMENT), pp. 11–20, 2016, [Online]. Available: https://sid.ir/paper/256703/en

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