Evaluation of Strength Characteristics and Weathering Grade on a Long Term Weathered Volcanic Rock

Abstract

Recently increasing the road construction in according to development of national economy, high cutting slope is frequently constructed in order to get good road line. Rock slope is cut and exposed simultaneously at air pollution, it happens the reduction of strength while proceeding weathering. Even if we have many studies about weathering of granite and sedimentary rock, we don't have many materials of the study about weathering on volcanic rock. Therefore in this paper, when we plan the rock slope at volcanic rock, performing the weathering acceleration experiment, we tried to predict the change of rock parameter quantitatively on a long term weathering. we figured out the weathering minerals at volcanic rock presently through chemical sensitivity analysis , tried to suggest the quantitative weathering grade calculating the chemical index of weathering and chemical index of alteration. And we performed slaking durability experiment in order to figure out the durability of rock before-and-after weathering. We performed the experiment connected physical weathering index such as absorption, elastic wave velocity, coefficient of permeability, uniaxial compressive strength, joint surface shear test and tried to predict the change of the strength and permeability of rock quantitatively before-and after weathering. We observed the change of rock surface before-and-after weathering through the stereo microscope and scanning electron microscope analysis. The rock parameters from weathering acceleration experiment at volcanic rock are prepared the basic materials to be reasonable design and construction considering the weathering when we plan the real civil structures