Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading

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۴٫۲۷۶ در سال ۲۰۲۰

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۲۶ در سال ۲۰۲۱

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۰٫۹۰۱ در سال ۲۰۲۰

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Q1 در سال ۲۰۲۰

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Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading

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Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading


Multiple filling of gobs will  lead to a layered structure of the backfill. To explore the influence of layering structure on  the mechanical properties and failure modes of backfill, different backfill specimens were prepared with a cement/sand ratio of 1:4, a slurry concentration of 75%, and backfilling times of 1, 2, 3 and 4, separately. Triaxial cyclic loading and unloading experiments were carried out. The  results show that with an  increase in backfilling time, the peak strength of backfill decreases as a polynomial function and the peak strain increases as  an  exponential function. The  cyclic load enhances the linear character- istic of backfill deformation. The  loading and unloading deformation moduli have a linear negative cor- relation with the backfilling time. The  unloading deformation modulus is always slightly higher than the loading deformation modulus. The  failure modes of stratified backfill are  mainly characterized by conju- gate shear failure at the upper layer and tensile failure across the layer plane, and there is  usually no damage in  the lower layer away from the loading area.

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  1. Introduction

The mechanical parameters of backfill are  often obtained by the uniaxial loading curve. The  uniaxial compression test is  a  basic method for  determining the  mechanical parameters  of  backfill [1–۴]. Many experimental  studies  on  the backfill with different concentrations, cement sand ratio, curing period have been carried out.  Fall et al. studied the effects of tail  particle size,  density, tem- perature and sulfur content on  the strength of the backfill [5].  Xu et al.  obtained the micro-mechanism of  consolidating filling   of super-fineness unclassified tailings and  cementitious  materials under different conditions by  means of XRD and SEM [6,7].  Gong et al. analyzed the b-value characteristics of the acoustic emission of cement backfill at each loading phase with considering different working conditions [8]. Han  et al. established the regression model of the uniaxial compressive strength of backfill and the slurry den- sity,  cement dosage, and cement sand ratio based on  orthogonal tests [9]. Liu et al. established a damage constitutive model of four different proportioning backfills based on the theory of continuous damage  mechanics  and   discussed  the   reasonable  matching between  backfill and  rock   mass  [۱۰].   Wu   et al.  analyzed the

influence of the Tabol  power exponent, initial porosity, type and content of  cemented material on  the strength and deformation characteristics of cemented waste rock  backfills with continuous gradation [11].

Many experimental  studies have focused on  the influence of cement sand ratio, slurry concentration, temperature  and curing period on  the mechanical properties of  backfill, but the layering structure is less  considered. In addition, most of the experimental studies are  mainly routine  loading tests  [۱۲–۱۹]. However, it  is often difficult to  backfill the giant gobs  at a  time in  the process of stepwise or  subsequent  backfilling, and multiple backfilling of the gobs  will inevitably lead to the layering phenomena in backfill. Field   experience shows that  there are   some  differences in  the mechanical properties of complete backfill and stratified backfill. In addition, due to  the disturbance of adjacent pillar mining and the lateral pressure effect of the surrounding rock,  the backfill is often in complex environments. Carrying out  conventional loading tests is  not  entirely consistent with engineering practice, so  the mechanical parameters and the failure rules cannot fully  charac- terize the engineering practice. In this research, the triaxial cyclic loading and unloading tests were conducted to explore its mechan- ical  properties and failure modes based on  the actual situation in the field.

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