You are currently viewing رسالة ماجستير عبد الله سمير / بعنوان: GIS-Based Multi-Depth Geotechnical Map Construction for the Province of Diyala

رسالة ماجستير عبد الله سمير / بعنوان: GIS-Based Multi-Depth Geotechnical Map Construction for the Province of Diyala

Abstract

This study aims to produce multi-depth geotechnical maps using GIS, the purpose of which is to give the field engineer an initial impression of the type of soil he is dealing with, its classification and its strength, which facilitates the engineer’s quick decision-making regarding estimating the type of foundation, its depth and the number of floors for the structure. This thesis is concerned with showing GIS maps of important variables for the bearing capacity of soil in Diyala province at depths of 1-2, 2-3, 3-4, and 4-8 meters below the natural ground level. These variables are SPT number and undrained shear strength cu. GIS maps of friction angle and unit weight, despite the availability of all data, due to the small range of data variation for these variables, which is beyond the program’s ability to handle. A great effort is being made to collect 227 boreholes from different local and licensed soil testing agencies. For a more comprehensive purpose, the total area of Diyala province was divided into five sectors, each of which was studied separately.  These sectors are officially divided by the central authorities, and as such, they are: Baqubah, Khalis, Muqdadiyah, Khanaqin, and Balad Ruz. The author believes that these geotechnical GIS maps will be of great use to the ministries concerned with the construction of all types of engineering facilities and all types of highways. They will guide the course of engineering planning and stabilize the local economy in Diyala.

It is generally concluded that for the unexcavated shear strength maps, there are small patches of hard to very hard shear values, some of which fluctuate in existence through depth as the majority of Diyala soils are clayey soils with shear strength ranging from soft to hard. This results in low bearing capacity unless field investigations reveal otherwise. The SPT GIS maps are less convergent and more similar to the shear GIS maps. SPT maps are used in many applications, as the soil engineer can extract other soil parameters from the SPT using a standard soil text book. There are many links available for design.  In general, the shear resistance of the clay soil in Baqubah city, for example, ranged between 36-57 kPa, while the very hard areas where the shear resistance of the clay soil was between 89-180 kPa were in very small areas concentrated in the north of the city and were considered small compared to the total area, and this applies to almost all depths. Al-Khalis district was very similar to Baqubah, while Al-Muqdadiyah district had harder soil in terms of the cu ratio ranging between 36-88 kPa and sometimes reaching 100 kPa in the last depths, while Baladruz and Khanaqin were dominated by weak to medium soils, with cu ranges between 42-75 kPa. As for the SPT number, the dominant ratio in most districts ranged between 3-30 strokes and sometimes increased with depth

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