Numerical simulation of stress-strain behaviour of cemented paste backfill in triaxial compression
Numerical simulation of stress-strain behaviour of cemented paste backfill in triaxial compression
复制标题
胶结浆体充填体三轴压缩应力应变特性数值模拟
DOI：
10.1016/j.enggeo.2017.10.021
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发表时间：
2017-12-14
影响因子：
7.4
通讯作者：
Liu, Xiaoyan
中科院分区：
文献类型：
--
作者：
Liu, Quansheng;Liu, Dongfeng;Liu, Xiaoyan
基于离散元法-二维颗粒流程序（PFC 2D），建立了一个模拟胶结充填体应力-应变曲线的数值模型，主要用于预测胶结充填体的力学性能。该模型充分考虑了胶结充填体的特殊性，包括其粒度分布范围广，随着胶结过程孔隙比的变化以及由于低粘结剂含量导致的胶结不足。数值模拟得到的试样的晶粒尺寸分布和初始孔隙比与CPB试样的真实值相一致。胶结颗粒模拟胶结产物，随CPB水化过程而增加。结果表明，该数值模型能较好地模拟CPB材料的真实应力-应变行为。参数敏感性研究表明，粘结特性和颗粒摩擦系数对模型性能影响较大。该模型可用于CPB材料的强度预测和粘结剂添加剂的优化。
This paper develops a numerical model to reproduce the stress-strain curve of cemented paste backfill (CPB) based on the discrete element method-2 dimensional particle flow code (PFC2D), mainly to predict the CPB mechanical properties the model fully considers the special nature of CPB, including its wide range in grain-size distribution, evolving void ratio with the cementing process and deficient cementation due to the low binder content. The grain size distribution and initial void ratio in the numerical sample correspond to the true values of the CPB specimen. The cementing particles are used to simulate the cementation product and increase with the CPB hydration process. Results show that the numerical model performs well in simulating the true stress-strain behaviour of the CPB material. Sensibility Study of the parameters indicates that bond characteristic and particles friction coefficient strongly influence the model performance. This model can be used for strength prediction and binder additive optimization for CPB material.