Lesson Learned from Weathering Clay Shale Residual Interface Shear Strength Testing Method

Fathiyah Hakim Sagitaningrum, Samira Albati Kamaruddin, Ramli Nazir, Budi Susilo Soepandji, Idrus M. Alatas

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Clay shale has been a problematic soil due to its weathering characteristic. Weathering is the degradation of shear strength due to exposure to water and air. As the depth of soil increases, the weathering effect would decrease, leading to different weathering grades. On a slope, the different weathering grades would lead to an interface slope failure. Until now, laboratory methods on finding the interface shear strength between the weathering grades seldom been investigated. This research will propose a method and give an evaluation of the results. An interface direct shear test has been conducted until its residual state between an undisturbed clay shale and weathering clay shale. The weathering condition of the bottom clay shale is achieved by soaking and drying the bottom of the sample using a two-days wetting-drying cycle. Results showed scattered values with different behavior for the soaked and unsoaked conditions for increasing weathering days. The soaked condition resulted in an increasing cohesion, increasing average stress ratio, and decreasing friction angle. The unsoaked condition resulted in decreasing cohesion, increasing friction angle, and increasing average stress ratio. Previous research shows that, the residual shear stress should have decreased as the weathering days increases. The cause for the contrary results is due to soil swelling and the absence of a separator when weathering the bottom clay shale. In conclusion, the test conducted is not quite suitable to understand the interface shearing behavior of weathering clay shale. Thus, a modification is suggested for future research according to the identified causes.

Original languageEnglish
Title of host publicationProceedings of the 5th International Conference on Rehabilitation and Maintenance in Civil Engineering - ICRMCE 2021
EditorsStefanus Adi Kristiawan, Buntara S. Gan, Mohamed Shahin, Akanshu Sharma
PublisherSpringer Science and Business Media Deutschland GmbH
Pages523-531
Number of pages9
ISBN (Print)9789811693472
DOIs
Publication statusPublished - 2023
Event5th International Conference on Rehabilitation and Maintenance in Civil Engineering, ICRMCE 2021 - Virtual, Online
Duration: 8 Jul 20219 Jul 2021

Publication series

NameLecture Notes in Civil Engineering
Volume225
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

Conference5th International Conference on Rehabilitation and Maintenance in Civil Engineering, ICRMCE 2021
CityVirtual, Online
Period8/07/219/07/21

Keywords

  • Clay shale
  • Direct shear test
  • Interface shear strength
  • Residual shear stress
  • Weathering

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