黄土触探阻力曲线和磁化率曲线对比的环境意义

Environmental signification of comparison of loess′ penetrograms and magnetic susceptibility curves

黄土环境意义的研究对全球环境变化的研究具有重要的意义。而通过研究黄土磁化率曲线又是研究黄土环境变化的一种重要方法。该文运用便携式可变能量动力触探仪，现场测试了黄土的力学性能。通过具体实例，比较分析了黄土的触探曲线和磁化率曲线，探讨了这两类曲线可比性的原因。比较结果表明，黄土触探曲线不仅能反映黄土力学强度的变化，而且比磁化率曲线更细微、更精确。

Study of the loess environmental signification plays an important role in the study of global environmental change. One of the most important methods to study the loess environmental and climatic change was by the loess' magnetic susceptibility curve. After a brief introduction of the principle of the portable dynamic penetrometer with variable energy, its application to loess was presented. A comparison of penetrograms obtained by this device to the corresponding magnetic susceptibility curves in several sites was carried out. The explications that the two curves could be comparable are then discussed. The results show that the penetrograms not only put the evolution of loess mechanical strength in evidence, but also they are finer and more precise than the magnetic susceptibility curve. Through the comparison of the penetrograms to the magnetic susceptibility curve, it is possible to study indirectly the loess environmental and climatic change.