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Control of Groundwater by Trenching Method for Slope Stability of Granite Soil Area

Nurhidayah binti Shaari, Nurhidayah (2009) Control of Groundwater by Trenching Method for Slope Stability of Granite Soil Area. Universiti Teknologi Petronas, Sri Iskandar,Tronoh,Perak. (Unpublished)

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Abstract

The objective of this study is to find the influence of lowering groundwater level on slope stability. The project is examines soil moisture as a factor that influence the slope failures, soil characteristics, and the design of the control method for residual soil from granite. The slope stability issues concerning some factors that influenced the slope failures are investigated and presented. It focuses on granite soil because most landslides in Malaysia occur in granite soil. Residual soil in granitic area consists of minerals from the weathering products of feldspar, quartz and mica minerals. Soil are taken from Bukit Kledang and brought to Geotechnical Laboratory for tests. From the laboratory session, the soil is a fine soil containing 17.75% of moisture content during normal condition, and has acidic pH value of 4.71. The specific gravity of granite soil is 2.655. The liquid and plastic limit tests indicate that the plasticity index of the soil is 7.46%. The content meaning the soil is silt with low plasticity (ML) according to the plasticity chart. The soil also has a hydraulic conductivity, k from 0.001 to 0.01 cm/sec which still under the standard of fine sand. In addition, from the shear box test, the shear strength of the soil from the study area is 82.907-141.029 kN/m2. The modification of the soil; by adding 5% of Calcium Hydroxide (CaOH) is not really affected the effectiveness of the water flow. Even though the modified soil has higher k value, immediate test shows that it has low shear strength. Trenching is an innovative technique to construct a protective trench at the slope area by using gravel and lined with geotextile. The design of trenching also consists of perforated pipes and drain to flow the groundwater out. Trenching is a good option to intercept groundwater which is perched above a relatively impermeable soil. Laboratory testing was conducted based on a trenching model for granite soil based on the design. From the tests conducted to the trenching model, it shows that the moisture content of the soil (15.96-21.22%) is less than the liquid limit (39.50%). It means the trenching lowers the moisture level. The water that flow out from the perforated pipe is also clear and without sediment. From the Slope/W analysis, the factor of safety determined is 1.454 in order to get the stable factor of safety as applied by Malaysia standard. This control method is considered to be cost effective because the materials to be used are confined to the trench only

Item Type: Final Year Project
Subject: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:24
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/601

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