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| Support principles of NPR bolts/cables and control techniques of large deformation |
| HE Manchao1，2，LI Chen1，2，GONG Weili1，2，WANG Jiong1，2，TAO Zhigang1，2 |
| (1. State Key Laboratory for Geomechanicsand Deep Underground Engineering，China University of Mining andTechnology，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract In order to control and forecast geological disasters such as deep rock burst of high stresses，pressure bump and landslides，a new constant resistance and large deformation(CRLD)bolt/cable with negative Poisson?s ratio(NPR) was developed. The concept and mechanical behavior of NPR support were firstly put forward in view of the excellent performance of NPR materials or structures such as anti-impact，anti-shear and energy absorb. Based on the rheological mechanical and analytical model of NPR structure，the unified ideal elastic-plastic constitutive relation for NPR bolts/cables and NPR rock was verified theoretically. The proportional NPR support system was formed. Through the static tensile test，anti-impact and anti-explosion underground tests and landslide monitoring test，the correctness of the theoretical model of constitutive relationship was verified and the control and prediction of large deformation in open pit and underground mining were achieved effectively.
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2016, Vol. 35 
