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为了研究滇中泥质粉砂岩的崩解特性,对不同风化程度的泥质粉砂岩进行了静态崩解试验、室内环境崩解试验和耐崩解试验。试验结果表明:岩石风化程度越高,崩解越剧烈;强风化状态的泥质粉砂岩在第四次循环后基本崩解完全,耐崩解系数Id2为46.2～61.8;弱风化和微风化泥质粉砂岩在第二、第三次循环崩解开始加剧,耐崩解系数Id2分别为61.1～73.6和79.5～85.4;崩解物以0.5～2mm和小于0.25mm颗粒物为主。泥质粉砂岩的崩解是由岩石浸水膨胀、胶结物溶解和干湿循环产生的拉应力与张应力共同引起的。
In order to study the disintegration characteristics of muddy siltstone in central Yunnan, static disintegration test, indoor environment disintegration test and disintegration test were carried out on muddy siltstone with different degree of weathering. The results show that the higher the weathering degree of rock is, the more severe the disintegration is. The strong weathering muddy siltstone basically disintegrates completely after the fourth cycle and the disintegration resistance Id2 is 46.2 ~ 61.8. The weathered and slightly weathered mud In the second and the third cycles of disintegration, the quality siltstone began to aggravate. The disintegration resistances Id2 were 61.1-73.6 and 79.5-85.4 respectively. The disintegration products were mainly composed of particles of 0.5-2 mm and less than 0.25 mm. The disintegration of the argillaceous siltstone is caused by the expansion of rock flooding, the dissolution of cements and the tensile and tensile stresses caused by the wet-dry cycle.