红层泥岩水岩作用特征研究

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。该类岩层多为软岩与硬岩相间,呈互层状产出,层间结合力弱。受区域构造影响,岩层扭曲褶皱强烈,多中高倾角,结构面发育,有泥化现象。红层中的泥岩具有透水性弱、亲水性强,遇水易软化、塑变,抗风化能力弱,易崩解等特性。特别是遇水后岩体及结构面抗剪强度大幅度降低,并且具有遇水膨胀、失水收缩的工程特性。水岩作用对边坡的影响主要有,结构面遇水泥化导致楔形体失稳,泥岩塑性变形引起边坡蠕变,同时红层还具有很强的崩解性,边坡开挖后发生崩解等现象。

ANALYSIS OF THE INTERACTION BETWEEN MUDSTONE AND WATER

The red bed is a clastic sedimentary rock mainly deposit by red continental sedimentation, the rock property is mainly composed by sandstone, mudstone, siltstone and arenaceous shale.It is alternate for the soft rock and hard rock, in existence by alternating layers, the layer combines weak.had influenced by the regional structure,the layer has great torsion , fold and high angle fault. The mud stone in the red bed has the character of weak water permeability, stick up to airslake is weak,has obvious differential airslake and the speed of disaggregation is quickly. the red beds slope influenced by the interaction between rock with water will lead wedge instability,slope creep deformation and disintegration ect.