Abstract:Abstract: In order to study sloughing mechanism and anti-sloughing measures of collapsible strata in Yitong area, according to research status of the current domestic and international sidewall stability, this paper focusing on the appearance characteristics of the core, rock mineral composition analysis, test of the shale physics and chemistry properties. When testing shale physics and chemistry properties, we mainly chose to test CEC, specific water absorption, shale recoveries and shale inflation rate. According to the test results, we analysed sloughing mechanism, and then proposed anti-sloughing measures.