Abstract:

Plateau gravel soil is widely distributed in the Tibet Plateau. The shear strength of gravel soil is closely related with the stability of slope. In the present research, large-scale shear tests on gravel soils in China and abroad are reviewed firstly. By using the large-scale indoor and field dual-purpose direct shear apparatus, the mechanical properties of gravel soils in Bangpu mining area in Tibet are analyzed.Furthermore, in association with direct shear test and indoor test results as well as theoretical formulas, a geological model is established in FLAC^3D to analyze the slope stability in this area. The research results offer a feasible method for similar analysis on gravel soils.

Key words: plateau gravel soil, large direct shear test, slope, stability analysis