细尾矿砂破坏准则的测试与安全影响

发布时间：2019-04-25 20:34

【摘要】：为研究细尾矿砂破坏准则的具体形式和安全影响,利用HCA试验的方法测试了子午平面和π平面的破坏曲线;采用数值模拟的方法分析了所获破坏准则引起的尾矿坝安全系数变化。结果表明:子午平面的破坏曲线为单调递增;π平面破坏曲线在静水压力较小状态与Mohr-Coulomb准则一致,静水压力较大状态与Drucker-Prager准则一致,针对试验对象静水压力分界点可确定为200 k Pa;若基于分界点在坝体内设置双重破坏准则,安全系数介于单独准则所得值之间,且Drucker-Prager准则单元所占比重介于31.33%~60.67%时,滑面区内Drucker-Prager准则单元数量变化,安全系数变化较明显,比重取其余值滑面区内Drucker-Prager准则单元数量不变,安全系数变化不明显。细尾矿砂破坏准则应为Mohr-Coulomb与Drucker-Prager组合而成的双重准则,组合过程需考虑静水压力的影响。
[Abstract]:In order to study the concrete form and safety effect of the failure criterion of fine tailings, the failure curves of meridian plane and 蟺 plane were tested by means of HCA test. The change of safety factor of tailings dam caused by the failure criterion is analyzed by numerical simulation. The results show that the failure curve of Meridian plane increases monotonously; The 蟺 plane failure curve is consistent with the Mohr-Coulomb criterion in the condition of lower hydrostatic pressure, and the larger hydrostatic pressure is consistent with the Drucker-Prager criterion. The boundary point of hydrostatic pressure for the test object can be determined as 200k Pa;. If the double failure criterion is set up in the dam body based on the boundary point, the safety factor is between the values obtained by the individual criterion, and the proportion of Drucker-Prager criterion elements is between 31.33% and 60.67%, the number of Drucker-Prager criterion elements in the sliding surface region changes. The change of safety factor is obvious, the number of Drucker-Prager criterion unit in sliding surface area is not changed, but the change of safety factor is not obvious. The failure criterion of fine tailings should be a double criterion composed of Mohr-Coulomb and Drucker-Prager. The influence of hydrostatic pressure should be taken into account in the combination process.
【作者单位】：辽宁工程技术大学理学院;辽宁有色勘察研究院;辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金项目(51474121,11202091,51404136,51274110) 辽宁省教育厅科研项目(LJCL007) 国家自然基金煤炭联合基金重点项目(U1361211) 辽宁省百千万人才项目([2015]33号)
【分类号】：TV649

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