基于FAHP-TOPSIS的岩溶隧道超前地质预报方案优化

Scheme Optimization of Advanced Geological Prediction for Karst Tunnel Based on FAHP-TOPSIS

为了预防岩溶隧道涌水突泥、塌方等地质灾害的发生,通常采用超前地质预报方法来探测掌子面前方的地质情况。该文研究地质调查分析法、超前水平钻探法、隧道地震勘探法和地质雷达探测法共4种超前地质预报方法,并针对探测能力、适用范围和探测精度分析每种方法的可行性,提出3种超前地质预报的组合方案。结合模糊层次分析法和逼近理想解法,计算组合方案影响因素的权重,对各方案与理想方案的接近程度进行排序,得到岩溶隧道超前地质预报方案最优解。实例应用结果表明,地质调查分析法+超前水平钻探法+地质雷达探测法的组合形式为大新隧道超前预报最佳组合方案。该法能消除单一物探方法的多解性,提高了超前地质预报的准确性。

In order to prevent the occurrence of geological disasters such as water inrush,mud inrush and collapse in karst tunnels,the advanced geological prediction method is usually used to detect the geological conditions in front of the palm face.In this paper,four advanced geological forecasting methods,including geological survey and analysis method,advanced horizontal drilling method,tunnel seismic prediction method and ground penetrating radar method are studied.Based on the feasibility analysis of each method in terms of detection capability,range of application and accuracy,three combination schemes of advanced geological prediction are put forward.Combining the FAHP and the TOPSIS method,the weights of the influencing factors of the combined schemes are calculated,and the similarity of each scheme to the ideal scheme is ranked to obtain the optimal scheme of the advanced geological prediction.The application results show that the best combination form of Daxin tunnel advanced geological prediction is:geological survey and analysis+advanced horizontal drilling+ground penetrating radar.This method can eliminate the multi-solution of single method and improve the accuracy of advanced geological prediction.