动静组合加载下不同负温人工冻结粉质黏土强度和变形特性分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (1) : 154-160.

论文

马冬冬1, 2，马芹永1, 2，黄坤1, 2，袁璞1, 2，姚兆明1, 2

作者信息 +

Strength of artificially frozen silty clay with different negative temperatures under dynamic and static combined loading and deformation characteristic analysis

MA Dongdong1, 2, MA Qinyong1, 2, HUANG Kun1, 2, YUAN Pu1, 2, YAO Zhaoming1, 2

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文章历史 +

摘要

研究动静组合加载下不同负温冻土的强度和变形特性对提高冻土开挖破碎效率、确保冻土工程稳定具有重要的理论和工程意义。借助改进的分离式Hopkinson压杆试验系统，研究了不同负温下人工冻结粉质黏土的静态和动态应力-应变曲线、抗压强度、变形模量和破坏特征。试验结果表明，单轴动态压缩条件下，随着试验温度的降低，人工冻结粉质黏土应力-应变曲线弹性段占比有减少的趋势，峰后下降段逐渐趋于明显；三维动静组合加载下，不同负温冻土的应力-应变曲线均可分为弹性、塑性和破坏三个阶段。人工冻结粉质黏土在冲击荷载作用下的温度敏感性要强于静态荷载，体现冻土的动脆性特征；在冲击荷载作用下，冻土在三维动静组合状态的温度敏感性要弱于单轴状态。动态单轴荷载作用下，不同负温冻土试样均呈粉碎状破坏，而三维动静组合状态下冻土破坏后无明显裂纹。

Abstract

Study the strength and deformation characteristics of frozen soil with various negative temperature conditions under coupled static and dynamic loads had important theoretical and engineering significance for improving the excavation and crush efficiency of frozen soil and ensuring the stability of frozen soil engineering. The static and dynamic stress-strain curve, compressive strength, deformation modulus and failure characteristics of artificial frozen silty clay with various negative temperatures were investigated with the help of a modified split Hopkinson pressure bar (SHPB) system. Test results indicated that under uniaxial dynamic compression condition, with the decrease of test temperature, the proportion of elastic stage of stress-strain curve of artificial frozen silty clay tended to decrease, and the decrease stage after peak stress gradually became obvious. Under three-dimensional coupled static and dynamic load, the stress-strain curves of frozen soil under different negative temperatures could be divided into elastic stage, plastic stage and failure stage. The temperature sensitivity of artificial frozen silty clay under impact load was stronger compared with that under static load, reflected dynamic brittleness characteristic of frozen soil. In addition, under impact loading, the temperature sensitivity of frozen soil under three-dimensional coupled static and dynamic loads was weaker compared with that under uniaxial state. Under dynamic uniaxial load, failure modes of frozen soil specimens with various negative temperatures were crushed. However, there were no obvious cracks for frozen soil under three-dimensional coupled static and dynamic load.

导出引用

马冬冬1, 2，马芹永1, 2，黄坤1, 2，袁璞1, 2，姚兆明1, 2. 动静组合加载下不同负温人工冻结粉质黏土强度和变形特性分析[J]. 振动与冲击, 2022, 41(1): 154-160

MA Dongdong1, 2, MA Qinyong1, 2, HUANG Kun1, 2, YUAN Pu1, 2, YAO Zhaoming1, 2. Strength of artificially frozen silty clay with different negative temperatures under dynamic and static combined loading and deformation characteristic analysis[J]. Journal of Vibration and Shock, 2022, 41(1): 154-160

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