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Over-excavation forecast of underground opening by using Bayes discriminant analysis method

Journal of Central South University of Technology 2008年第4期15卷 498-502页

作者：宫凤强李夕兵张伟 School of Resources and Safety Engineering Central South University Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines Changsha 410083China

A method to forecast the over-excavation of underground opening by using the Bayes discriminant analysis(BDA)theory was *** Bayes discriminant analysis theory was *** on an engineering example,the factors influencing the over-excavation of underground opening were taken into account to build a forecast BDA model,and the prior information about over-excavation of underground opening was also taken into *** parameters influencing the over-excavation of opening,including 2 groups of joints,1 group of layer surface,extension and space between structure faces were selected as geometric *** data in an underground opening were used as the training *** cross-validation method was introduced to verify the stability of BDA model and the ratio of mistake-discrimination was equal to zero after the BDA model was *** in an underground engineering were used to test the discriminant ability of BDA *** results show that five forecast results are identical with the actual situation and BDA can be used in practical engineering.

关键词： underground opening over-excavation Bayes discriminant analysis forecast

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Constitutive Laws of the underground opening Collapse due to Dynamic Load

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Transactions of Tianjin University 2008年第B10期14卷 483-490页

作者： Alexander BUDKOV Gevorg KOCHARYAN Institute for Dynamics of Geospheres Russian Academy of Sciences Moscow Russia

The constitutive laws of the collapse of underground openings in a rock massif were in-vestigated based on the results of laboratory and field experiments, and computations using ana-lytical and numerical models. It is shown that the principal mechanism of failure of underground openings over important for practice peak particle velocity amplitude range of 1 to 10 m/s is the roof and wall breakage due to the fall of key blocks. Over this load range the material crushing is of considerably less importance. The geometry of discontinuities influences mainly the stability of key blocks. Further caving depends weakly on block structure of near-tunnel zone. The mean volume of fall material is a rather stable quantity for rock massifs of different structures. Lower tunnel sta-bility in the zones of high fracturing is caused by a higher probability of the presence of the unsta-ble key blocks and the decrease of strength characteristics of fractured bounding blocks. The de-crease of average block size is a less important accompanying factor.

关键词： explosion underground opening rock discontinuity key block dynamic load

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