Permafrost Roadbed Stability Evaluation Based on Improved Matter-element Extension Model
To accurately and objectively evaluate the permafrost highway roadbed stability,the evaluation system was established based on the criteria layers(i.e.,permafrost characteristics,geological environment,climate conditions,and engineering status),including 12 indicators.The permafrost highway roadbeds were selected as the samples from 7 sections.The objective and subjective weights of each indicator were calculated by using G1 method and entropy weight method.The comprehensive weight of each evaluation indicator was determined with the game theory.The matter-element system for permafrost highway roadbed stability level was constructed through the matter-element transformation,and the correlation degree of each indicator was calculated.By combining the game theory weighted sum and matter-element extension model,a new evaluation model for permafrost highway roadbed stability was established.The new model was used to evaluate the permafrost highway roadbed stability in 7 sections.The result indicates that the annual average ground temperature,engineering measures,roadbed height,annual average temperature,and ice content are the main factors affecting the permafrost stability.The permafrost highway roadbed stability evaluation method,based on game theory combined weight and matter-element extension model,avoids the subjectivity bias by using G1 weight method.Simultaneously,it avoids the entropy method being overly dependent on the indicator data and ignoring the indicators'importance.The indicators'weight in permafrost roadbed stability evaluation becomes more scientific and reasonable.The evaluation results match well with the deformation monitoring data of actual roadbeds,verifying the scientific validity and effectiveness of the proposed model.
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