基于层次分析法的隧道综合地质预报优化

隧道综合地质预报是解决隧道施工期地质问题、降低施工风险的一项重要技术手段。鉴于目前综合预报多为简单的数量上的综合,为更加有效地利用综合预报技术,首先归纳地质分析辨识常见不良地质体的方法,通过地质分析法初步判定隧道掌子面前方可能存在的地质异常,并结合层次分析法的基本思路,将影响预报手段的指标量化,即赋予预报方法权重,建立二级综合评价指标体系,研究不同预报方法对特定工程地质条件的适用性,以选择几种最优预报方法。主要研究结论如下:利用地质分析法定性、层次分析法定量的方法优选预报手段,减少了综合超前地质预报中物探手段选择的随意性,并据此建立综合预报体系。最后将该体系应用于紫荆山隧道F2断层的预报中,成功预报了ZK221+960处地下暗河,避免了施工事故的发生,取得了一定的经济效益,证明了通过层次分析法来优化综合预报方法的可行性。

ANALYTIC HIERARCHY PROCESS BASED OPTIMIZATION FOR TUNNEL COMPREHENSIVE GEOLOGIC PREDICTION

As an important technological measure, comprehensive prediction in geology can solve many engineering geological problems and reduce the risk of construction in tunneling. But present comprehensive prediction is simply focused on quantity. In order to make comprehensive prediction more effective,a method to identify common adverse geological body is generalized by geo-analysis. Geological defect that may exist in front of face is preliminary determined by this method. Based on the principles of Analytic Hierarchy Process(AHP),factors that effect prediction measures are quantified, and the weight is given to each of them. Then two levels comprehensive appraisal index system are established. All of them is to research the suitability of different prediction methods in a particular engineering geological condition, and to optimize the best ones. The main results are as fallows. Prediction methods are optimized by geo-analysis method and AHP, which are used for qualitative and quantitative respectively. Arbitrary of choosing geophysical exploration measures is eliminated in the comprehensive prediction. The comprehensive forecast technical system is established. Aiming at the F2 Fault of Zijinshan Tunnel, a karst river is predicted successfully at ZK221+960 by using this system. It's verified that the AHP based comprehensive prediction is practicality and feasibility.