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为进一步弄清颗粒破碎对软岩粗粒料强度、变形的影响,开展2组不同初始干密度下的绢云母片岩粗粒料的固结排水三轴试验,分析了绢云母片岩粗粒料颗粒破碎规律,并探讨了颗粒破碎对绢云母片岩粗粒料力学性质的影响。结果表明,绢云母片岩粗粒料相对破碎率随围压的增加而增大,但颗粒破碎增幅速率受初始干密度影响较大,颗粒破碎与围压之间的关系可用线性关系描述;由于初始孔隙率的影响,使得试样在同一应力水平下高密度试样颗粒破碎明显高于低密度试样;颗粒破碎对高密度试样抗剪强度降低的影响高于低密度试样,导致两种干密度试样的应力-应变曲线在某处出现相交,最终出现初始密度低的试样抗剪强度大于初始密度高的试样抗剪强度的现象;高密度试样孔隙率较小,其剪胀因子一直保持在1附近,而低密度试样孔隙率较大,受颗粒破碎和剪胀的影响迟缓一些,低密度试样体变较高密度要大些,但整体上由于颗粒破碎和剪胀的影响,绢云母片岩粗粒料的体变均不大。
In order to further clarify the influence of particle crushing on the strength and deformation of soft rock coarse aggregate, two groups of three-axis consolidation tests of sericite schist coarse aggregate under different initial dry densities were carried out. The effects of sericite schist coarse aggregate particles The influence of particle breakage on the mechanical properties of sericite schist coarse aggregate was discussed. The results show that the relative crushing rate of sericite schist increases with the increase of confining pressure, but the rate of increase of particle crushing is greatly affected by the initial dry density. The relationship between crushing and confining pressure can be described by a linear relationship. Porosity of the sample so that the sample at the same stress level of high-density sample particle crushing was significantly higher than the low-density samples; particle crushing on the high-density sample shear strength decreased higher than the low-density samples, resulting in two The stress-strain curve of the dry density sample intersects somewhere, and finally the shear strength of the sample with low initial density is higher than that of the sample with high initial density. The porosity of high density sample is small, The swelling factor has been maintained around 1, while the porosity of low-density samples is larger, which is slightly affected by the particle breakage and dilatancy. The low-density sample body changes to a higher density, but due to the particle crushing and shearing The effect of swelling is that the volume change of sericite schist coarse aggregate is not large.