The System Development Of Slope Safety Evaluation And Early-warning Decision-making For Large Hydropower Stations

Many problems about high slope engineering in the process of hydropowerdevelopment will be encountered inevitably, especially in the southwest mountainvalley, where there is rich in water power resources. Based on the existing safetyevaluation and early warning research achievements of slope, a systematic study wascarried out from slope’s information collection, processing and analysis forecast ofmonitoring information, real-time safety assessment, and early warning and auxiliarydecision-making, in addition, a set of slope’s safety evaluation and early warning anddecision-making system in large hydropower was developed. The main researchcontents and results can be summarized as follows：(1) The information collection and feedback platform of slope engineering wereset up by IOT. IOT was applied to the slope engineering of hydropower stations.Based on the technology, such as sensor, wireless sensor network,3G/4G and Internet,the information collection and feedback platform was established.(2) The real-time evaluation method of slope’s observed behavior was brought upbased on variable sets, which was under the real-time monitoring data. According tothe slope’s monitoring arrangement in different periods, a comprehensive evaluationsystem of slope’s observed behavior was built dynamically. Using numericalsimulation, statistical analysis, or experience, the evaluation standard was proposeddynamically for different evaluation index respectively. Synthesizing subjective andobjective weight, the dynamic weight that changing with monitoring state wasdetermined. Finally, real-time comprehensive evaluation of slope’s observed behaviorwas realized by variable set.(3) Considering changing information, such as the change of slope excavationprogress in the construction process, the discovery of new geological information, therevision of supporting scheme, and the correction of calculation parameters,simulation method of slope’s real-time safety was put forward by the numericalsimulation technology. Based on database technology and secondary development ofABAQUS, the dynamic mapping of numerical calculation model about theaforementioned information was realized. Under the real-time monitoring information, dynamical retrieval of mechanical parameters of rock mass was realized. Finally, thesimulation of slope’s real-time safety analysis and forecasting were achieved.(4) Based on the abnormal evaluation of monitoring information, real-timeevaluation of observed behavior, real-time safety simulation and expert knowledgebase, etc, the two-stage early warning system of slop’s safety was proposed. Takingspace-time distribution, mechanics rules, monitor model, and monitoring indexjudgment, exceptional conditions were detected online in real time; Using thecomprehensive evaluation method of slope’s observed behavior and simulationmethod of slope’s real-time safety after found abnormity, the whole and local safetystatus and potential disaster were analyzed further; Based on all kinds of analysisresults, the slope warning level was determined finally by expert system under theevaluation results; According to the potential slop’s disasters form, slope level, andrisk level, corresponding emergency plans were launched rapidly.(5) The development of slope’s safety evaluation and early warning anddecision-making system in large hydropower station included three platforms, fivemodules and a site. The integrative of real-time analysis and quick feedback, whichwas "collection-processing-analysis-assessment-feedback-warning-decision",was realized from the system.