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Geomechanics and Engineering Volume 33, Number 5, June10 2023 , pages 453-462 DOI: https://doi.org/10.12989/gae.2023.33.5.453 |
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Engineering characterization of intermediate geomaterials – A review |
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T. Ashok Kumar, Ramanandan Saseendran and V. Sundaravel
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| Abstract | ||
| Intermediate Geomaterials (IGMs) are natural formation materials that exhibit the engineering behavior (strength and compressibility) between soils and rocks. The engineering behavior of such material is highly unpredictable as the IGMs are stiffer than soils and weaker/softer than rocks. Further, the characterization of such material needs exposure to both soil and rock mechanics. In most conventional designs of geotechnical structures, the engineering properties of the IGMs are either aligned with soils or rocks, and this assumption may end up either in an over-conservative design or under-conservative design. Hence, many researchers have attempted to evaluate its actual engineering properties through laboratory tests. However, the test results are partially reliable due to the poor core recovery of IGMs and the possible sample disturbance. Subsequently, in-situ tests have been used in recent years to evaluate the engineering properties of IGMs. However, the respective in-situ test finds its limitations while exploring IGMs with different geological formations at deeper depths with the constraints of sampling. Standard Penetration Test (SPT) is the strength-based index test that is often used to explore IGMs. Moreover, it was also observed that the coefficient of variation of the design parameters (which represents the uncertainties in the design parameters) of IGMs is relatively high, and also the studies on the probabilistic characterization of IGMs are limited compared with soils and rocks. With this perspective, the present article reviews the laboratory and in-situ tests used to characterize the IGMs and explores the shear strength variation based on their geological origin. | ||
| Key Words | ||
| heavily overconsolidated clay; indurated soil; probabilistic characterization; residual soil; soft rock | ||
| Address | ||
| T. Ashok Kumar: Department of Civil Engineering, National Institute of Technology Puducherry, Karaikal-609609, India Ramanandan Saseendran: Department of Civil Engineering, Indian Institute of Technology Madras, Chennai-600036, India V. Sundaravel: TechnipFMC, Chennai, India | ||