充填料浆流动沉降规律与充填体力学特性研究
发布时间：2018-10-24 20:18
【摘要】：采场中充填体的几何结构和力学特性是影响充填体质量的控制性因素。通过开展充填料浆流动沉降相似模拟试验及充填体单轴和常规三轴压缩试验,揭示采场充填体的结构特征与强度分布规律,研究不同围压下不均匀充填体的变形特征与破坏模式。结果表明,(1)采场内充填体存在两个分界面和粗骨料、细骨料及灰砂3个不同区域,沿充填料浆流动方向,充填体的强度呈减小 增加 减小的"S"型分布;(2)充填体三轴压缩轴向应力 应变曲线包括压密、弹性、屈服、应变软化、残余强度5个阶段,相同区域充填体的强度随围压增加而上升,相同围压下不同区域的充填体强度大小依次为灰砂区域细骨料区域粗骨料区域。不同区域充填体的黏聚力大小依次为灰砂区域细骨料区域粗骨料区域,内摩擦角大小依次为粗骨料区域细骨料区域灰砂区域;(3)随围压的增大,充填体宏观破坏裂纹呈增多的趋势,宏观破坏主要为单斜面剪切破坏、张剪复合破坏和"Y"型破坏3种破坏形态。研究成果能为采场的充填钻孔数量与位置设计及稳定性分析提供理论依据。
[Abstract]:The geometric structure and mechanical properties of the filling body in stope are the controlling factors affecting the quality of the filling body. The structural characteristics and strength distribution of stope backfill are revealed by similar simulation test of filling slurry flow settlement and uniaxial and conventional triaxial compression tests of filling body. The deformation characteristics and failure mode of non-uniform filling body under different confining pressures were studied. The results are as follows: (1) there are two interfaces and three different areas of coarse aggregate, fine aggregate and lime sand in the backfill body along the flow direction of the filling slurry. (2) the axial stress-strain curves of the filling body under triaxial compression include five stages: compaction, elasticity, yield, strain softening and residual strength. The strength of the filling body in the same area increases with the increase of confining pressure, and the strength of the different areas under the same confining pressure is the coarse aggregate area of fine aggregate area in the same confining pressure. The cohesive force of the filling body in different regions is the coarse aggregate area of the fine aggregate area, the internal friction angle is the coarse aggregate area and the fine aggregate area of the coarse aggregate area in turn. (3) with the increase of the confining pressure, the cohesive force of the filling body is the coarse aggregate area, the internal friction angle is the coarse aggregate area and the fine aggregate area is in turn. The macroscopic failure cracks of the filling body show an increasing trend. The macroscopic failure mainly consists of three failure modes: single inclined shear failure, tension-shear composite failure and "Y" type failure. The results can provide theoretical basis for the design and stability analysis of the number and position of filling boreholes in stope.
【作者单位】： 华北理工大学矿业工程学院;华北理工大学河北省矿业开发与安全技术实验室;
【基金】：河北省自然科学基金项目(No.E2014209093,No.E2016209220)~~
【分类号】：TD801
[Abstract]:The geometric structure and mechanical properties of the filling body in stope are the controlling factors affecting the quality of the filling body. The structural characteristics and strength distribution of stope backfill are revealed by similar simulation test of filling slurry flow settlement and uniaxial and conventional triaxial compression tests of filling body. The deformation characteristics and failure mode of non-uniform filling body under different confining pressures were studied. The results are as follows: (1) there are two interfaces and three different areas of coarse aggregate, fine aggregate and lime sand in the backfill body along the flow direction of the filling slurry. (2) the axial stress-strain curves of the filling body under triaxial compression include five stages: compaction, elasticity, yield, strain softening and residual strength. The strength of the filling body in the same area increases with the increase of confining pressure, and the strength of the different areas under the same confining pressure is the coarse aggregate area of fine aggregate area in the same confining pressure. The cohesive force of the filling body in different regions is the coarse aggregate area of the fine aggregate area, the internal friction angle is the coarse aggregate area and the fine aggregate area of the coarse aggregate area in turn. (3) with the increase of the confining pressure, the cohesive force of the filling body is the coarse aggregate area, the internal friction angle is the coarse aggregate area and the fine aggregate area is in turn. The macroscopic failure cracks of the filling body show an increasing trend. The macroscopic failure mainly consists of three failure modes: single inclined shear failure, tension-shear composite failure and "Y" type failure. The results can provide theoretical basis for the design and stability analysis of the number and position of filling boreholes in stope.
【作者单位】： 华北理工大学矿业工程学院;华北理工大学河北省矿业开发与安全技术实验室;
【基金】：河北省自然科学基金项目(No.E2014209093,No.E2016209220)~~
【分类号】：TD801
【参考文献】
相关期刊论文 前10条
1 卢宏建;梁鹏;南世卿;宋爱东;胡亚军;;采场充填料浆流动轨迹探究与充填体特性分析[J];金属矿山;2016年10期
2 吴爱祥;沈慧明;姜立春;焦华U，
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