Experimental study on mineral composition of sedimentary rock and influence of durable disintegration

In order to study the difference of sedimentary rock slake durability,its mechanism and its relationship with mineral composion，this article set several representative types of sedimentary rock (such as coarse gravel sandstone,fine gravel sandstone,siltstone,and mudstone)as a study example in Fuxin Mining Area,by using XRD,XRF and MIP to test and analyze rock samples` mineral composition,element component as well as porosity.It also utilized the resistant to disintegration test to quantify the characterization of rock disintegration characteristics,and analyzed the influence which might cause by rock mineral composition and discussed the disintegration of difference.The results showed that the disintegration resistance of sedimentary rocks was closely related to mineral composition,element composition and porosity.With the increase of durable disintegration test cycles,sedimentary rock collapse resistance index would decrease gradually.The slaking of the sedimentary rock could be divided into two types:the content of illite which in mineral composition was higher (over 10%),the rock slaking was resulted from block swelling difference caused by clay minerals expansion in water.The content of illite which in mineral composition was lower (under 10%),the rock slaking was resulted from the element in the sample ionized with water and pore water expansion.