The Air Force Engineering Design and Research Institute

Beijing, China

The Air Force Engineering Design and Research Institute

Beijing, China

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Xu G.-C.,The Air Force Engineering Design and Research Institute | Gu J.-C.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Zhang X.-Y.,The Third Engineer Scientific Research Institute of the Headquarters of the General Staff | Li C.-X.,The Air Force Engineering Design and Research Institute | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

When material bearing explosive dynamics load is in failure state, it has the shear dilatancy behaviors, at the same time, the material structure and the elastic wave velocity are changed. The material volume strain and the velocity near explosive cavity are measured using strain gauge embedded in model body and acceleration sensor. Measuring results show that, in the model test, the similar failure rock zone area as reality under the explosion circumstance is obtained; the measuring methods are effective and reasonable, when it is used to monitor failure area in explosive model test and it can provide experimental basis for related analysis.


Xu G.,The Air Force Engineering Design and Research Institute | Yuan W.,The Air Force Engineering Design and Research Institute | Gu J.,Henan Institute of Engineering | Zhang X.,Henan Institute of Engineering | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

To improve the explosive resistivity of the existing underground cavity, crossing cable anchoring in the surrounding rocks was proposed. The effects were studied with the model tests based on the theory of similarity. The influence of anchoring cables and rock intensity on explosive resistivity was studied with the numerical simulation. The peak pressure, peak acceleration, peak displacement at vault and the whole destruction extent of the anchored underground cavity were lower than those of conventional underground cavity under the same explosive load. The volume of explosive cavity, the radius of plastic zone and the cracks in rock of anchored area were smaller, and the explosive energy dissipated by the anchored rocks nearby burst point was larger. The bigger of the anchored area, the bigger of the angle of anchoring cable;the smaller of anchoring space between cables, the longer of anchoring cable length and the higher of rock strength led to the smaller peak value of displacement at vault. The angles of anchoring cable had the largest effect on the peak displacement, the strength of surrounding rock or the space between anchor cables had the lower effect, and the anchoring cable area or anchoring cable length had the smallest effect. ©, 2015, Academia Sinica. All right reserved.


Xu G.,The Air Force Engineering Design and Research Institute | Gu J.,Henan Institute of Engineering | Zhang X.,Henan Institute of Engineering | Li C.,The Air Force Engineering Design and Research Institute | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

The penetration resistivity of the homogeneous, layered and massive surrounding rocks anchored by crossing cable are researched by model tests based on the theory of similarity. The experimental results show that the type of (homogeneous, layered and massive) surrounding rock has little influence on the penetration depth. The higher quality of rock mass, the less increasing quantity of penetration resistivity. The largest penetration depth of the massive model rock, the least penetration depth of layered surrounding rock. In this article, the basic reasons which lead the penetration depth smaller between reinforced and unreinforced model rocks are analyzed; and the first condition to improve the penetration resistivity of model rocks is to improve the compression capacity of model rocks. The simulated rock mass containing lower rate of cable, though it can improve the simulation materials tensile strength, it fails to improve the bomb penetration ability of simulation rock mass. The results of the model tests are also simulated by LS-DYNA. The numerical simulation is in good agreement with the experimental results. The numerical simulations show that the change of angle and the space of anchors which influence on the penetration depth of rocks is small. Although the crossing cable fails to improve anti-bomb penetration of the simulated rock mass, the increase of the tensile strength and shearing capacity for material of rock mass can obviously reduce the deformation of the underground structure, conducive to the stability of the underground structure.

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