Engineering Geological Characterization of the Weathering Profile of Low-Grade Metamorphic Rock with Particular Reference to the Soil–Rock Boundary, A Case Study at UKM, Malaysia
DOI:
https://doi.org/10.64862/Keywords:
Weathering grade, Rock-Soil boundaryAbstract
Weathering has affected most ground mass at shallow depth. This research approach is to determine rock and soil properties of low-grade metamorphic rock as well as to assign them according to their weathering grade and to delineate the soil and rock boundary. From the laboratory results it was found that soil samples from Universiti Kebangsaan Malaysia (UKM) are well graded silty sand with low to medium plasticity. From the laboratory analysis for rock, it was found that > 60% of the Schmidt hammer rebound values fall into the weathering grade III as well as the porosity ranges from 7.4% to 8.9% indicating that the rock samples are in weathering grade III. But the soil samples did not give any Schmidt hammer readings. Point load and UCS values of the samples range from Is50, 0.90 to 1.51 MPa and UCS values, 15.03 to 26.06 MPa respectively. UCS value from the point load test was derived with the help of α = 18.6. From the slake durability test of rock samples, they showed greater durability index (Id3%) > 88 and for the soil samples (Id3%) range from 18 to 29% and some soil samples showed < 10%. Slake durability test indicates that the rock samples are in weathering grade III and some soil samples are in weathering grade IV, Vand VI. From the above observation, the rock and soil boundary is between weathering grade III and weathering grade IV.
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