Rock Mass Deterioration in the Hydro-Fluctuation Belt of Carbonate Riverside in the Three Gorges Reservoir of the Yangtze River,China
Hydro-fluctuation belt is a distinct area with alternating dry-wet action formed by ceaseless shifting of rise and fall of reservoir water table.Compared with other parts on a shore slope,strong water-rock interaction develops on a hydro-fluctuation belt,consequently altering geomorphology of the shore slope,even undermining its stability to some extent.Although great efforts were made to investigate the roles of hydro-fluctuation belt in riverside stability,there were still insufficient knowledge of rock mass deterioration characteristics,degradation classification and assessment,and deterioration indicators.In this study,it investigated carbonate rock masses suffered erosion from hydro-fluctuation effect in the reach of Zhigui and Badong of the Three Gorges reservoir of the Yangtze River,China.Field survey,indoor experiments,analogy method,etc.were used to reveal the characteristics,process and mechanism of rock mass deterioration.(1)Based on the macroscopic erosion effect to rock mass in the hydro-fluctuation belt of shore slope,it could categorize four levels of deteriorations.Joint water-rock interaction inflicted by reservoir water and groundwater controlled degradable extents of carbonate rock mass,but it weakened gradually along the depth direction;therefore,rock mass could be divided into three zones in terms of the property variation.(2)The most serious deterioration took place along various discontinuity planes in rock mass,among which fracture planes played crucial roles in governing primary deterioration characteristics and types of rock mass.(3)Erosion behaviors of reservoir water associated with erodibility jointly affected deterioration phases of rock mass as well as development pattern.(4)Based on interaction levels between reservoir water and groundwater in riversides,this study introduced deterioration indicators and a proper approach to evaluating of carbonate rock mass deterioration in hydro-fluctuation belt,and justified by engineering applications.The research has reference significance for evaluation of rock mass deterioration in hydro-fluctuation belt.
hydro-fluctuation beltcarbonate shore slopewater-rock interactiondeterioration of rock massthe Three Gorges reservoir
万方数据
维普
