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Gao W.,Wuhan University | Zhang L.-Y.,The 9th General Team of Airport Construction of China | Zhang F.-J.,Wuhan Construction Engineering Group Co.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

Critical slip surface searching is vital to slope stability analysis. Essentially, this is a path searching problem, which can be solved by the ant colony optimization method. To overcome the shortcomings of traditional ant colony optimization, the premium-penalty strategy is introduced, and the pheromone diversity of the good paths and the ordinary ones is increased to polarize pheromone density of all paths. Thus, a new algorithm namely Premium-Penalty Ant Colony Optimization is proposed to discrete and simulate the problem of the critical slip surface searching, by which the critical slip surface of slope can be located. Through two typical examples, one with simple slope and the other with complicated slope, and an application example of a slope project of a dam, the efficiency and effectiveness of the new algorithm are verified. The results show that, not only for simple slope but also for complicated slope, the new algorithm can always find the better critical slip surface in shorter time than many previous algorithms, and the new algorithm can be used in engineering practice very well.

Gao W.,Hubei Engineering University | Wang L.,Wuhan Construction Engineering Group Co. | Yang D.,Changjiang Geotechnical Engineering Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Rock is a kind of natural engineering material with genetic defects. For the complexity of its mechanical property, the mature model to describe rock damage process is not yet established. To solve this problem, from the basic isotropic damage, based on strain equivalent principle and least energy consumption principle, one novel damage evolutionary model of the rock from the energy principle is developed. From analysis the whole test process of granite block from meso-damage to macro fracture, the damage evolutionary model of granite is obtained based on energy principle. Compared to the computing results of traditional Marzars damage model, we can find that the new damage model proposed here can reflect the rock damage process more reliably, and coincide with the real fracture process of rock test very well.

Gao W.,Wuhan University | Wang L.,Wuhan Construction Engineering Group Co. | Yang D.,Changjiang Geotechnical Engineering Co.
Advanced Science Letters | Year: 2012

For the damage process of rock is a kind of energy-consuming process in nature, it should conform to the least energy consumption principle. Here, a new damage evolution model based on the least energy consumption principle is proposed. With the real experiments of granite specimens, the new model is verified. It can be seen that, the stress-strain curves (part before the peak) of the theoretical model is coincided with the test curve well. The new damage evolution equation is a better reflection on rock damage process, and the obtained critical damage value is more precise than that of classical Marzars theory. So, this new method is suitable to describe the evolution process of rock damage. © 2012 American Scientific Publishers. All rights reserved.

Gao W.,Hubei Engineering University | Zhang F.-J.,Wuhan Construction Engineering Group Co.
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2012

To improve the computing efficiency of the traditional ant colony clustering algorithm, from data combination mechanism, an abstraction ant colony clustering algorithm was proposed. By analyzing the data of rock burst samples, from the engineering analogy thinking by the abstraction ant colony clustering algorithm, a new method for forecasting of rock burst in deep underground engineering was given. Some rock burst engineering applications of deep mines prove that compared with traditional ant colony clustering algorithm, for similar computing difficulty and complexity, the validity of the new algorithm whose accuracy is 92%, is higher, and the computing velocity can increase 40%. So the abstraction ant colony clustering algorithm is practical for rock burst forecasting.

Lin M.-Q.,Wuhan Institute of Technology | Lin M.-Q.,Wuhan University of Technology | Xia Y.-Y.,Wuhan University of Technology | Liao L.-L.,Wuhan University of Technology | Xiong W.,Wuhan Construction Engineering Group Co.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2014

To study the rock burst mechanism under different stress circumstances and the effect of rock burst on rock internal damage characteristics, the rock burst experiments of specimen under different stresses were conducted by using the independent research and development rock burst experimental device, as the same time, the acoustic test and elastic wave CT technology applied before and after experiment. The experimental results showed that internal damage characteristic of the specimen before and after experiment could reflect directly by using the elastic wave CT imaging, and the loading paths had the major impact on failure characteristic and internal damage characteristic. The expansion phenomenon near the loading surface obviously presented on the specimen like cavity 'V' under the higher unloading pressure stress condition, while, it obviously presented spelling under the lower condition. The internal specimen has larger degree of damage at the higher unloading condition than that at lower unloading. ©, 2015, Wuhan University of Technology. All right reserved.

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