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Abstract To improve the explosive resistivity of existing underground cavity，the surrounding rocks anchored by crossing cable method was proposed，and the effect of its were researched by model tests based on the theory of similarity. Then，based on the validity of numerical model was proved，the influence of anchor cable parameters and rock intensity on explosive resistivity were studied by numerical simulation. The work results show that the maximum pressure，maximum acceleration response，maximum displacement response and whole destruct extent of the underground cavity，which surrounding rocks anchored by crossing cable，are lower than those of conventional underground cavity under the same explosive load；meanwhile，the explosive cavity，semidiameter of plastic section and rock crevice of anchored rocks are smaller，the explosive energy dissipated by anchored rocks nearby burst point is bigger. The bigger anchor cable area，anchor cable angle and anchor cable length and the stronger rock mass intensity are，the less the structure vault displacement response is，while the effect of anchor cable interval is opposite. The first condition to improve the explosive resistivity of underground cavity is to increase the anchor cable angles，subsequently，to enhance the compression capacity of anchored rocks or to reduce the interval of anchor cable. Whereas，the impact of anchor cable area and anchor cable length upon explosive resistivity are feeble. The study can provide references to the design of protective projects and the reinforcement of the wall rock and tunnels.
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2015, Vol. 34 
