不同水固比富水充填材料失稳破坏特征研究
发布时间：2018-10-15 09:38
【摘要】：为探讨在开采扰动作用下不同水固质量比富水充填材料失稳破坏时的特征与临界条件、水固质量比对富水充填材料变形特性的影响,通过蠕变、应力-应变等试验,研究了不同应力条件下不同水固质量比富水充填材料的蠕变性能及应力-应变特征,并得到了不同水固质量比充填材料失稳破坏的临界荷载。结果表明:富水充填材料在应力水平较小时,蠕变曲线有衰减阶段和稳定阶段2个阶段;当应力水平达到临界荷载时,蠕变曲线表现出3个阶段,衰减阶段、稳定阶段和加速阶段;水固质量比为1.7、2.0和2.5的充填材料失稳破坏的临界荷载分别为其28 d抗压强度的92%、90%和85%,临界荷载随着水固质量比的提高而降低;应力-应变关系曲线宏观上有4个阶段:初始变形阶段,弹性阶段,塑性变形阶段和破坏阶段;弹性模量随着水固质量比的提高而降低。
[Abstract]:In order to study the characteristics and critical conditions of unstable failure of water-rich filling materials with different water-solid mass ratios under mining disturbance, and the effect of water-solid mass ratio on deformation characteristics of water-rich filling materials, creep, stress-strain tests were carried out. The creep properties and stress-strain characteristics of water-rich filling materials with different water-solid mass ratios under different stress conditions were studied, and the critical loads of unstable failure of filling materials with different water-solid mass ratios were obtained. The results show that when the stress level is small, the creep curve has two stages: attenuation stage and stable stage, and when the stress level reaches critical load, the creep curve shows three stages and decay stage. In the stable stage and acceleration stage, the critical loads for the instability failure of filling materials with a water-solid mass ratio of 1.7 and 2.5 are 92 90% and 85% of the compressive strength of 28 days, respectively, and the critical load decreases with the increase of the mass ratio of water to solid. The stress-strain relationship curve has four stages: initial deformation stage, elastic stage, plastic deformation stage and failure stage, and the elastic modulus decreases with the increase of water-solid mass ratio.
【作者单位】： 北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金项目(编号:1374036)
【分类号】：TD823.7
[Abstract]:In order to study the characteristics and critical conditions of unstable failure of water-rich filling materials with different water-solid mass ratios under mining disturbance, and the effect of water-solid mass ratio on deformation characteristics of water-rich filling materials, creep, stress-strain tests were carried out. The creep properties and stress-strain characteristics of water-rich filling materials with different water-solid mass ratios under different stress conditions were studied, and the critical loads of unstable failure of filling materials with different water-solid mass ratios were obtained. The results show that when the stress level is small, the creep curve has two stages: attenuation stage and stable stage, and when the stress level reaches critical load, the creep curve shows three stages and decay stage. In the stable stage and acceleration stage, the critical loads for the instability failure of filling materials with a water-solid mass ratio of 1.7 and 2.5 are 92 90% and 85% of the compressive strength of 28 days, respectively, and the critical load decreases with the increase of the mass ratio of water to solid. The stress-strain relationship curve has four stages: initial deformation stage, elastic stage, plastic deformation stage and failure stage, and the elastic modulus decreases with the increase of water-solid mass ratio.
【作者单位】： 北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金项目(编号:1374036)
【分类号】：TD823.7
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