砒砂岩化学成分特征对重力侵蚀的影响

本文以内蒙南部砒砂岩的重力侵蚀为例,研究岩石化学成分与重力侵蚀发育的主要控制因素抗剪强度的之间关系。通过对砒砂岩样品的化学成分、矿物组成、力学性质等参数的测试和试验结果,利用化学蚀变指数(CIA)阐明了岩石的风化程度,分析了岩石中不稳定的化学成分在水的作用下,对岩石的化学风化作用和岩石强度的影响。并对砒砂岩的化学成分含量与其内聚力进行两两相关分析和多元相关分析。这些对砒砂岩区基岩的重力侵蚀机理研究具有一定的参考价值。

Effect of chemical compositions of Pisha sandstone on the gravity erosion

Gravity erosion is an important erosion style in southern Inner Mongolia.It is controlled by the shear strength of Pisha sandstone.Relationships between the chemical compositions of the sandstone and the shear strength are discussed in this paper.Through analyzing the chemical composistions,mineral compositions and mechanical properties of the sandstone samples,the weathering degree of Pisha sandstone was clarified using the CIA(chemical index of alteration).Under the effect of water on the unstable chemical compositions,the change in chemical weathering and the rock strength of the stone was also examined.The correlations between each chemical compound and the cohesion,and the multiple regression analysis of chemical compounds and the cohesion,were analyzed.These are helpful in research on the mechanism of gravity erosion of sandstone in the study area.