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http://dx.doi.org/10.7843/kgs.2014.30.7.41

Effect of Joint Cohesive Strength on the Earth Pressure against the Support System in a Jointed Rock Mass  

Son, Moorak (Department of Civil Engrg., Daegu Univ.)
Solomon, Adedokun (Department of Civil Engrg., Daegu Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.30, no.7, 2014 , pp. 41-53 More about this Journal
Abstract
This study examined the magnitude and distribution of the earth pressure on the support system in a jointed rock mass by considering different joint shear strength, rock type, and joint inclination angle. The study particularly focused on the effect of joint cohesive strength for a certain condition. Based on a physical model test (Son and Park, 2014), extended parametric studies were conducted considering rock-structure interactions based on the discrete element method, which can consider the rock and joint characteristics of rock mass. The results showed the earth pressure was strongly affected by the joint cohesive strength as well as the rock type and joint inclination angle. The study indicated that the effect of joint cohesive strength was particularly significant when a rock mass was under the condition of joint sliding. This paper investigates the magnitude of joint cohesive strength to prevent a joint sliding for each different condition. The test results were also compared with Peck's earth pressure, which has been frequently used for soil ground. The comparison indicated that the earth pressure in a jointed rock mass can be significantly different from that in soil ground. This study is expected to provide a better understanding of the earth pressure on the support system in a jointed rock mass.
Keywords
Rock excavation; Support system; Earth pressure; Joint cohesive strength; Rock type; Joint inclination angle; Rock-structure interaction;
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