Calculating effective stress, total stress, and pore water pressure.

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Governs the velocity of water flow through porous media.

Unified Soil Classification System (USCS) and AASHTO.

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Fundamentals of Geotechnical Engineering by Diego Inocencio T. Gillesania is a cornerstone textbook for civil engineering students and board exam aspirants in the Philippines. The book synthesizes complex soil mechanics and foundational engineering principles into accessible, problem-solving formats. This comprehensive guide explores the core concepts covered in Gillesania's manual, its relevance to licensure examinations, and how to effectively utilize these principles in practical engineering scenarios. Core Concepts in Geotechnical Engineering

Physical copies are widely available at Gillesania Engineering Review Center (GERTC) and major bookstores like National Book Store.

Widely used in foundation engineering, it classifies soils into coarse-grained (gravels and sands) and fine-grained (silts and clays) based on grain size distribution and Atterberg limits.