Paper Key : IRJ************734
Author: Nasir Hassan,Dr Sorabh Gupta
Date Published: 03 Nov 2022
Geo-Technical Engineering plays a vital role in any construction projects like in the construction of bridge, roads, buildings, development of hydro power projects, foundation of massive structures like big chimney and transmission towers. The main purpose of the investigation is to get an idea related to the site where the structure is to be built. This not only saves the design and construction time but also may be considered as the main source of information for the proper planning, safe and sound, economical design and proper execution. The geo-technical investigation also gives us ideas about the Sub-surface condition of the site where the construction is to be proposed. Geo-technical investigations can be considered as an essential part for the design of structures and for the planning the construction techniques. Geo-technical investigations can be carried out for determination of the natural profile of soil deposits at the site, withdrawing the soil samples at the site and then determining engineering and index properties of that soil. Sampling of soil can be approached in two ways: - It can be laboratory test or it can be in situ testing of the soil. The study of collapsible soils was started as early as 1820s, but due to the inadequate knowledge on the nomenclature of soil collapse, the researchers cannot predict the full understanding of collapse phenomenon. Also, due to the variety in types and chemical composition of soils has amplified this problem. Therefore, this dissertation will provide the advance and point to point knowledge on collapsible soil which will help the researchers to understand the behavior of collapsible soil in better ways. For this dissertation work to be carried out smoothly and to predict the soil collapse at the proposed site (Sangam site) it was necessary to go for the laboratory testing as this part focuses the prime concern and objective of this dissertation. The sampling was done at Sangam were a multi storied building was proposed for the construction. This site being very close to the river Jehlum has various serious impacts for being the collapsible soil due to the presence of water in its vicinity. Various geotechnical experiments were performed for the determination of Index and engineering properties of collapsible soil. Moreover, Soil structure was also studied and a correlation was developed between the void ration, loading on the soil along with various parameters like dry density, Moisture content and porosity. As these problematic soils gave a challenge for the geotechnical engineers regarding the construction on this type of soil. Furthermore, this problematic soil covers almost 10% of the earths land. In order to mitigate this problem, understanding the collapse mechanism is of utmost importance because it saves us the maintenance cost and even sometimes the human lives. Therefore, in this research a key aspect will be highlighted which directly or indirectly affects the collapse by analyzing the various properties of collapsible soil. The outcome of this dissertation is to have a proper understanding for the collapse phenomenon and the factors which affects it. To achieve the goal of this dissertation and to summarize the result the index property of soil was studied, remedial measures were given to the collapse soil by using magnesium chloride as a green stabilizer and the chemistry of collapse potential were studied by Consolidmeter. A series of the tests were performed on the collapsible soil on the various factors such as dry density, water content and surcharge pressure. Also, Consolidmeter test were performed to determine the collapse potential. Experimental results though obtained proves that collapsibility of soil is directly proportional to the various properties of soil such as dry density, water content and total load applied on collapsible soil. Furthermore, the collapse potential was studied in depth by taking a green stabilizer in the form of magnesium chloride to determine the remediation of collapse potential. Furthermore, magnesium chloride acts as de- icing agent which controls the collapsibility of the soil. It was also observed that magnesium chloride improves the mechanical behavior of collapsible soil.
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