| Summary: | 碩士 === 國立中央大學 === 應用地質研究所 === 99 === Relief is a fundamental landscape reflecting the influence of uplift and erosion. Contrary to the traditional concept that the relief is dominated by incision, recent research indicated that the landscape-scale material strength play an important role on the landform process. However, it is difficult to obtain a representative strength parameters based on laboratory rock tests. Slope height and slope angle were frequently used to infer the strength of rock mass (both for earth and Mars). In this study, a series of slope response curves are proposed to constrain the rock mass strength. Non-linear Hoek-Brown failure criterion is incorporated into the proposed model where the linear Mohr-Coulomb failure envelop seems oversimplified. Field work (measure the geological strength index; GSI) are conducted to validate the non-linear model which the influence of pore pressure is considered. A difference less than 8% between the GSIs obtained from back analysis and site investigation indicates the feasibility to back calculate the rock mass strength from GSI-based slope performance curve. Consequently, the strength of rock mass could be inferred from the topography. Based on parametric study, slopes with high uniaxial compressive strength, low pore water pressure and high slope height are less sensitive to the back calculations.
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