Innovative Achievement of Major Engineering Project - "Key Technologies for the Stability Control of Ultra-high and Steep Slopes in Layered Rock Mass under Complex Structural Conditions"

On May 11, 2023, the Scientific and Technological Achievement Evaluation Meeting titled "Key Technologies for Stability Control of Ultra-High and Steep Slopes in Layered Rock Mass under Complex Structural Conditions" organized by the CSRME was held in Wudongde Engineering Construction Management Center. Academician Manchao He, President of the CSRME, served as the director of the evaluation committee.  Based on the Wudongde Hydropower Station, a national key project, focusing on  technical problems such as accurate survey, stability evaluation, safety control, and intelligent supervision of layered rock mass ultra-high and steep slopes, through theoretical research, technology research, equipment development, and engineering applications, the team systematically studied the key technologies for the safety control of layered rock mass ultra-high and steep slopes under complex conditions, and achieved the following innovative results:

1.A complete set of technologies for accurate survey of steep layered rock mass slopes under complex conditions have been created. The long-distance visual surveying and mapping technology for ultra-high and steep slope surface geological information has been developed. A automatic space search technology for long structural planes of slopes has been invented, which greatly improved the efficiency and reliability of the structural plane analysis. A fast and fine visual geological cataloging method for providing technical support has been developed for the precise survey of ultra-high and steep slopes of steeply inclined layered rock mass under complex conditions.

2.The stability analysis theory and evaluation method of the ultra-high and steep slope of steeply inclined layered rock mass under complex conditions have been proposed. A mechanical analysis model of steeply inclined layered rock mass considering the bending couple stress effect and deterioration mechanism have been constructed. A quantitative judgment criterion for the small angle between the strike of the rock stratum and the slope surface has been suggested. The multi-scale stability evaluation of steeply inclined layered rock mass problem has been solved.

3. The safety control technology for the ultra-high and steep slope of steeply inclined layered rock mass under complex conditions of strong engineering disturbance has been developed. The prevention and control technology and method of the "high prevention and pre-consolidation, stable excavation and protection" system have been proposed. A multi-layer nested coaxial and sequentially assembled anchor cable structure system has been proposed, which overcome the mutual feedback protection and risk prevention of engineering slopes and natural slopes. 

4. Intelligent real-time monitoring technology and efficient integrated management and control platform for ultra-high and steep slopes have been developed. A smart management system integrating real-time monitoring, intelligent diagnosis technology, and prevention technology for ultra-high and steep slopes has been constructed, realizing real-time online intelligent forecasting, early warning, and efficient collaborative management and control of slope disasters.

The research results have been successfully applied to the ultra-high and steep slopes of Wudongde Hydropower Station, and have been extended to the high slope design of Xulong, Yulong Kashi, Zala, Huangjinxia, and other projects. The research results have huge potential economic and social benefits and broad application prospects.