Engineering classification of argillite rocks with emphasis on laboratory tests in Makran structural field

Articles in Press

Document Type : Research Paper

Authors

1 Department of Geology, Faculty of Science, Tarbiat Modares University, Tehran, Iran

2 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

Argillite rocks are among the weak rocks that cause damage in the engineering project implementation due to stone swellability, high slake, and low strength and durability. South Makran structural zone is located in the southeastern part of Iran between the two thrust faults of Makran and Qasr-Ghand. Most of the sediments are Quartz fragments (silt size) with carbonate cement containing sub-minerals of calcite and fossil fragments, indicating a shallow and low-energy marine environment of the Neogene age. Based on the main faults south Makran is divided into four sub-areas, Makran, Zirdan, Chahan and Getivan. Field harvesting was used in each of the sub-areas for stone engineering classification and
sampling for laboratory tests to determine the physical, mechanical and dynamic characteristics of the rock. According to rock engineering classification, most sediments are in weak and very weak classification. Petrology studies, determination of physical characteristics, durability test, point load strength and ultrasonic test were carried out. The results of the tests show that the sediments located in coastal Makran have more porosity and less cement due to the youngness of the sedimentation basin, and they have less strength characteristics in terms of durability. The results of the second stage cycle durability test show that porosity changes have the highest correlation with compressional wave velocity, uniaxial compressive strength, calcium carbonate percentage and SiO2 percentage, and with the porosity increasing the efflorescence durability amount decreases (R2=0.82). The durability of the second stage (Id2) has a relationship between porosity percentage (n %) and compressive wave velocity (Vp) with a correlation value of (R2=0.91) and calcium carbonate percentage (%CaCO3) and compressive wave velocity (vp) with a value correlation of(R2=0.83). In order to determine the effective factors on the durability of argillite rocks, the experimental model of path analysis was used to determine the influencing coefficients, where porosity has a direct effect, and calcium carbonate percentage, dry
density, and compressive wave velocity have an indirect effect

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Article Title [Persian]

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Geopersia

Articles in Press, Accepted Manuscript
Available Online from 04 January 2025

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History

  • Receive Date: 29 October 2024
  • Revise Date: 26 December 2024
  • Accept Date: 04 January 2025

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