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Evaluation of Pore Size and Distribution Impacts on Uniaxial Compressive Strength of Lithophysal Rock

机译:孔隙大小和分布对岩性岩石单轴抗压强度影响的评估

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摘要

Discrete element method (DEM) has been extensively used for studying the properties of rock mass through numerical simulation, which includes bonded particle (or grain) model method (BPM) and discrete fracture network method. In this paper, utilization of BPM for modeling uniaxial compressive strength (UCS) of lithophysal rock is explored and associated stages are discussed and calibrated including generation of particles, sample scale, loading method, macro- and micro-parameters of BPM. In order to investigate the impacts of pore size and distribution of lithophysal tuff on UCS, various combinations of different pore sizes in one sample and different pore locations with the same pore size are simulated using BPM-DEM. The simulation results show that UCS significantly decreases due to the existence of pores with the same condition of porosity, and when the pore radii increase, the minimum value of UCS slightly declines. Moreover, combinations of different pore sizes in one sample show that greater proportion of small pore radii increases UCS of the sample, while the differences of UCS values decrease. Meanwhile, associated fracture has been observed to develop along the pore and generally tends to develop along the large pores at the edge of the sample in the process of uniaxial compression simulation, with relatively small associated UCS values.
机译:离散元法(DEM)已被广泛用于通过数值模拟研究岩体的特性,包括粘结颗粒(或颗粒)模型法(BPM)和离散裂缝网络法。本文探讨了利用BPM建模岩性岩石的单轴抗压强度(UCS),并讨论和校准了相关的阶段,包括颗粒的产生,样品规模,加载方法,BPM的宏观和微观参数。为了研究孔径和石质凝灰岩分布对UCS的影响,使用BPM-DEM模拟了一个样品中不同孔径和具有相同孔径的不同孔径位置的各种组合。模拟结果表明,在相同孔隙度条件下,由于孔隙的存在,UCS显着降低,当孔隙半径增加时,UCS的最小值略有下降。而且,在一个样品中不同孔径的组合显示出更大比例的小孔径半径会增加样品的UCS,而UCS值的差异会减小。同时,在单轴压缩模拟过程中,已观察到伴生裂缝沿孔隙发展,通常趋于沿样品边缘大孔隙发展,伴生UCS值相对较小。

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