Abstract:Silicates are the most important forming-rock minerals of earth crust rock and in exogenous environments,and the dissolution of silicate minerals is universal. In most laboratory experiments,there is an initial period during which nonlinear dissolution behavior is observed and steady-state dissolution rates range from 10-12 to 10-8 mol/(m2·s). Dissolution is nonstoichiometric in most experiments. Bulk dissolution rates are not directly proportional to the surface areas of the minerals studied,but when grains are large compared with the distance among adjacent defects,they will vary linearly with the specific surface areas. Under acidic conditions,dissolution rates are positively proportional to the concentration of hydrogen ion. Organic ligands deriving from organic soluble matter can complex metal ions in solutions and at solid-solution interface,and promote dissolution of silicate minerals. The effect of temperature on dissolution rates follows the Arrhenius equation. In view of the coincidence between the promoting factors of silicate dissolution and landslide occurrence,concentrations of chemical components in watershed surface water may be taken into account in regional evaluation of landslide hazard. Plants can raise the acidity of groundwater and content of organic mater in soil and groundwater runoff rate. The effect of plants on silicate mineral dissolution and landslide preparation is conspicuous. The nonlinear dissolution on slope rockmass scale and the multi-scale preferential dissolution of rock mass are necessary to investigate thoroughly. The concrete problems include identifying and dividing the lasting time of different dissolution states in natural slope water-rock systems,identifying multi-scale damage model of rockmass and transporting mechanism of fluid and chemical components in slope rockmass,and mechanical effect of multi-scale preferential dissolution and so on.