尾砂胶结充填体蠕变试验及统计损伤模型研究

发布时间：2018-09-17 20:33

【摘要】：为研究充填体蠕变力学特征,采用RLW-3000微机控制剪切蠕变试验机进行分级加载条件下的单轴压缩蠕变试验。试验结果表明:荷载越高充填体变形越快,充填体内部缺陷及弱面的压密与扩展在宏观上表现为充填体蠕变变形。假定充填体微元破坏概率与轴向应变存在关系,服从Weibull统计分布,结合充填体单轴抗压试验,确定了可以描述充填体损伤演化过程的损伤变量。将损伤变量引入Burgers模型中,建立了充填体蠕变统计损伤本构模型,采用MATLAB软件对充填体分级加载蠕变试验数据进行拟合,确定模型参数,结果表明:所建立的模型曲线与试验曲线较为吻合,应力水平越高,拟合结果精度越高,此模型可用于描述充填体蠕变力学行为。
[Abstract]:In order to study the creep mechanical characteristics of backfill, a RLW-3000 microcomputer controlled shear creep testing machine was used to carry out the uniaxial compression creep test under the condition of graded loading. The experimental results show that the higher the load is, the faster the deformation of the filling body is, the defect of the filling body and the compaction and expansion of the weak surface are shown as creep deformation of the filling body macroscopically. Assuming that there is a relationship between the failure probability and the axial strain of the filling body, according to the Weibull statistical distribution, combined with the uniaxial compression test of the filling body, the damage variables which can describe the damage evolution process of the filling body are determined. The damage variable is introduced into the Burgers model, and the statistical damage constitutive model of the backfill creep is established. The creep test data of the backfill are fitted by MATLAB software, and the parameters of the model are determined. The results show that the model curve is in good agreement with the experimental curve, and the higher the stress level is, the higher the fitting accuracy is. This model can be used to describe the creep mechanical behavior of the filling body.
【作者单位】：华北理工大学矿业工程学院;河北省矿业开发与安全重点实验室;
【基金】：河北省自然科学基金项目(编号:E2015209172) 唐山市科技计划项目(编号:12140208A-12,12140208A-11)
【分类号】：TD853.34

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