Experimental Study on Nonlinear Shear Strength Behavior of a Tropical Granitic Residual Soil (Grade Vi) at Various Initial Moisture Contents

Abstract

The conventional theories of soil mechanics use linear envelope to derive shear strength; this however, leads to an overestimation of the factor of safety in the examination of slopes. Therefore, the incorporation of methods that acknowledge the existence of non-linear characteristics of shear strength is necessary in the analysis of slopes specifically. This is due to the substantial influence of non-linear shear strength behavior on the slope failure mechanism when they are at low stress levels. In this paper, the nonlinearity of shear strength for grade VI granitic residual soil is studied. “Non-Axis Translation Consolidated Drained Triaxial” tests were performed at various ranges of net stress and suction. Thereafter, to characterize shear strength behavior, shear strength parameters were derived. The soil-water characteristic curve was plotted after conducting “Pressure Plate Extractor” test at a series of suction. The result substantiated the non-linearity of shear strength for granitic residual soil based on net stress and suction.

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

“…Measurement of strain on specimen is referred to as local measurement. The advent of these high resolution local sensors and transducers that can capture the soil behaviour more accurately at small strain has led to the discovery of the fact that soil behaviour is non-linear as against the previous researches that assumed linear stressstrain relationship (Hashash et al, 2010;Saffari et al, 2017). Non-linear stiffness characteristics have significant impression on the analysis and design of a broad range of geotechnical activities performed in soils (Atkinson, 2000;Hartzell et al, 2004;Gasparre et al, 2007;Figini et al, 2012;Kim and Roesset, 2004;Shih et al, 2017).…”

Liberica coffee as an alternative cropping system for sustainable farming on Indonesian Peatlands

“…As many as 6 core samples were taken from each zone. The sampling points were chosen randomly with a distance between the sampling points of about 20-30 m. All peat samples were brought to the soil laboratory for oven drying; 2) Peat maturity (consisting of fibric, hemic, and sapri) was observed manually in the field by squeezing method [23] on 30 points and 0-20 cm depth of each zone; 3) Peat depth was observed by a peat auger (Globalindo Teknik Mandiri, Bogor, Indonesia) [24] ; 4) Porosity and the water retention characteristics at pF 4.20 (permanent wilting point), 2.54 (field capacity), pF 2.00, and pF 1.00 (water saturation) were measured by a pressure membrane plates apparatus (Royal Eijkelkamp, Sassenheim, Netherlands) [25] .…”