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| Comparative experimental study on the shear behavior of cemented paste backfill and surrounding rock-backfill interface |
| XIU Zhanguo，WANG Shuhong，WANG Feili，REN Fengyu，NGUYEN Vantuan |
| (School of Resource and Civil Engineering，Northeastern University，Shenyang，Liaoning 110819，China) |
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Abstract The equivalent method of shear mechanical parameters(cohesion c and internal friction angle) is used in the arching theoretical model. To investigate the influences of different shear mechanical parameters on the arching theoretical model，the triaxial tests under constant confining pressures were firstly carried out to study the shear behaviors of the surrounding rock-CPB(cemented paste backfill) interface and the triaxial compression behaviors of the CPB. Based on the framework of Mohr-Coulomb strength theory，the shear mechanical parameters of the CPB and the surrounding rock-CPB interface were compared and analyzed under different curing times. Then，The scanning electron microscopy(SEM) and the thermal differential analysis(TG/DTG) methods were used to explain the difference in the shear behaviors of the CPB and the surrounding rock-CPB interface. Finally，based on the experimental results，the engineering application of Terzaghi's theoretical model was also discussed. The results show that with increasing the confining pressure，the shear displacement-shear stress curves of the surrounding rock-CPB interface present a multi-peak phenomenon and the axial strain-deviatoric stress curves of the CPB show an obvious elastic strengthening stage. The shear mechanical parameters(cb and ) of the CPB are significantly larger than the corresponding parameters(ci and ) of the corresponding surrounding rock-CPB interface. The ratio of the cohesion(cb/ci) between the two types(CPB and surrounding rock-CPB interface) is 2.26 to 2.67 times，and 1.65 to 2.76 times for the corresponding ratio of the internal friction angle(). Moreover，using the shear parameters(ci，) of the surrounding rock-CPB interface to predict the vertical stress() inside the CPB structure can effectively overcome the limitations of the Terzaghi¢s theoretical model. The conclusions can provide a reference for the prediction of the arching effect of the CPB structure and the selection of mechanical parameters in the numerical analysis.
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2021, Vol. 40 
