红层泥岩的剪切蠕变试验研究

红层是红色陆相沉积为主的碎屑沉积岩层,岩性以砂岩、泥岩、粉砂岩和页岩为主。红层中的泥岩抗压强度较低,并具有明显的流变特性,蠕变变形量较大,常造成工程边坡的失稳和破坏,在进行工程勘察设计时应充分考虑红层泥岩的蠕变特性,进行合理的参数取值。本文通过对滇中地区红层泥岩进行的室内剪切蠕变试验研究,分析了不同的法向正应力下天然状态与饱水状态红层泥岩的剪切蠕变特性,并通过对红层泥岩长期强度与短期强度试验资料的分析,提出了红层泥岩长期剪切强度的取值建议。

Experimental study on shear creep properties of the mudstone in red beds

The red beds are the clastic sedimentary rocks formed mainly by red continental sedimentation, and the lithology is mainly composed by sandstone,mudstone,siltstone and arenaceous shale,whose compressive strength is lower and with obvious rheological characteristics. The value of the creep deformation is big enough to cause the failure of slopes. The rheological characteristics should be taken into consideration for the investigation and design of slope engineering and the suitable parameters should be chosen. The shear creep tests for the mudstone in the red beds of Dianzhong are carried out. The creep characteristics under the natural conditions and the water-saturated conditions in different normal stresses are analyzed. Through the analysis on the data from the long-term and short-term shear strength tests,the suggestion for the values of the long-term shear strength of the mudstone in red beds is put forward.