A Study of the Influential Factors for Slope Safety of Gravity Retaining Walls

• Main Authors: Chia-Hsiang Wang, 王家祥
• Other Authors: Prof. DR.Wen-Fu Chen
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/30477793218824857295

碩士 === 國立中興大學 === 水土保持學系 === 92 === Taiwan is a densely populated small island, and have two-thirds of area of slope lands with it. Therefore, slope land is development for land use or for other purposes is almost inevitable. For these developed projects, different types of retaining walls are often used to take the advantage of the natural topographic height differences and usually a platform structure would be adopted with relevant facilities installed in order to obtain the largest possible land space for use. However, once the natural stable state and power of balance of the landform is interfered or disturbed by an external force, disasters such as land falls, landslides, avalanches, and even large-scale destructions will follow to help release the energy. The energy thus unleashed will need to be properly treated either through additional engineering structures or other appropriate measures in order to achieve a new stable state of system balance,or else the power of destruction will continue until another natural force of balance is controled. In other words, the retaining wall holds the key to any successful slope land development project. Due to the advances in relevant fields of basic sciences including soil mechanics, geology, material mechanics, and fluid dynamics in the modern times, reliable data regarding many states of existence of Nature can now be obtained through reasonable hypothesis and scientific analysis, simulation, testing, and inference. With adequate planning and design, plus economical and safe engineering structures and stabilization processing techniques, we can even bring down the probability of the occurrence of a disaster and thereby protect the lives and properties of the citizens. The lateral earth pressure theories of Rankine and Coulomb have been developed evolved through the a years long and become the most important basis for the analysis of retaining wall safety. The purpose of this study is to examine how the changes in the latent is endegenous factors (angle of soil friction ψ, angle of wall inclination i, angle of wall friction δ, earthquake angle θ, and angle of the upper slope surface inclination β) and the exogenous factors (earthquake force, groundwater level change) would affect the research on the safety of retaining walls using the earth pressure theories for analysis. Based on this, the study then proposed the concept of overload as an alternative solution for situations where the formulas provided by the earth pressure theories are inapplicable (with a negative inside the square root) under the state where (β+θ>ψ). It is hoped that through careful calculations and reasonable inferences, this study will make the basis for analysis to be more practical and ideal .