Study on the Soil Water Characteristic Curve and Shear Strength Characteristics of Granite Soil with Different Weathered
In this paper, the soils of the weathered granite with double layer soil slope in the hot and humid areas are studied. The water holding characteristics of compacted samples are studied by the pressure plate technique and vapor equilibrium method with sat
- PDF / 963,191 Bytes
- 8 Pages / 439.37 x 666.142 pts Page_size
- 14 Downloads / 181 Views
2
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China [email protected] Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China
Abstract. In this paper, the soils of the weathered granite with double layer soil slope in the hot and humid areas are studied. The water holding characteristics of compacted samples are studied by the pressure plate technique and vapor equilibrium method with saturated salt solution, and the effect of saturation on the shear strength is studied. The experimental results show that the residual soil has better water holding capacity than the completely weathered soil, which has greater air-entry value and residual suction value, and the gradient of the transition zone is smaller. There is an optimal saturation in this two weathered soils to reach the peak of the shear strength. The influence of shear strength index is different: the effect of saturation on the internal friction angle is little, but the effect on the cohesion is significant. The different weathered degree affects the soil properties such as the mineral composition and grain size gradation of two weathered soils. The residual soil has higher clay content and residual iron oxide, which affects two weathered soils in the soil water characteristic cure (SWCC) and shear strength of the characteristics. The mechanism of these differences can be clearly elucidated by analyzing the matrix suction and the cementation between soil particles, which provides a theoretical basis for the engineering management of weathered granite slopes. Keywords: Weathered granite soils Shear strength Cementation effect
SWCC Saturation
1 Introduction Geological disasters such as landslides and debris flows are frequent in the granite distribution area of southeastern China. Because of the different weathered degree, the weathered granite slope is diverse from the common homogeneous slope, the stability of the slope is more complicated. The weathered granite soils are formed by the weathered and laterization of granite under humid tropical climates. Numerous facts show that rainfall is the most important and most common factor affecting the shear strength of the slope, which leads to the shallow slope of the slope (Gvirtzman et al. 2008 and © Springer Nature Singapore Pte Ltd. 2018 L. Hu et al. (Eds.): GSIC 2018, Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, pp. 165–172, 2018. https://doi.org/10.1007/978-981-13-0095-0_19
166
Y. Lu et al.
Xu et al. 2011). The stability of weathered granite slopes is studied from the aspect of grain size composition, but the effect of saturation is neglected (Zhang et al. 1997). A similar study of unsaturated water holding capacity and strength has done a lot (Baker and Frydman 2009; Gallage and Uchimura 2010). At present, many studies have found that most of the landslides in the granite landslide are located in the residual soil with low shear stre
Data Loading...
