南华系南沱组冰碛砾岩上部冰湖相岩组力学与变形特性试验研究

Experimental Study of Mechanical and Deformation Characteristics of Glacial-Lacustrine Rock Formation of the Upper Part of Moraine Conglomerate of the Nantuo Formation of the Nanhua System

采用力学试验方法,对贵州瓮福磷矿英坪矿区南华系南沱组冰碛砾岩上部冰湖相岩组力学与变形特性进行了研究。试验表明:含水状态:遇水后迅速崩解破坏,强度急剧降低;干燥状态下:(1)剪切变形破坏含四个阶段:压密变形阶段、弹性变形阶段、塑性变形阶段、峰值后变形阶段;(2)单轴压缩变形破坏含三个阶段:弹性变形阶段、抗变形能力提升阶段、峰值后变形阶段;(3)蠕变破坏含四个阶段:瞬时变形阶段、减速蠕变或衰减蠕变阶段、等速蠕变阶段、加速蠕变阶段。

This study has a discussion on mechanical and deformation characteristics of moraine conglomerate of the Nantuo Formation of the Nanhuan System in the Yingping mining area of the Wengfu Phosphate Mine of Guizhou Province on the basis of mechanical test. The test results show as follows:(1)mechanical characteristics of the moraine conglomerate are greatly affected by moisture condition;(2)in the dry state, the shear deformation and failure process of the moraine conglomerate may be divided into such four stages as compaction deformation stage, elastic deformation stage, plastic deformation stage and post peak deformation stage;(3)in the dry state, the uniaxial compression deformation and failure process of the moraine conglomerate may be divided into such three stages as elastic deformation stage, deformation resistance improvement stage and post peak deformation stage;(4)in the dry state, the creep failure process of the moraine conglomerate may be divided into such four stages as instantaneous deformation stage, deceleration creep or attenuation creep stage, constant velocity creep stage and accelerated creep stage.