In order to analyze the instability mechanism of rock beam under multi-jointed rock,a multi-jointed rock beam model was established by using 3DEC.The destabilization process and instability forms of multi-jointed rock beam were simulated and analyzed.The results show that when the rock mass of the rock beam is odd,the rock beam is unstable and the four-hinged arch structure is applied.When the number of rock blocks is even,rock beam is three-hinged arch structure force;the failure of the rock beam mainly includes the slip of the middle rock mass and the cracking of the joint surface at the hinge point;due to the role of horizontal thrust,joint surface cracking occurs only at the hinge point;the degree of joint cracking reflects the degree of joint surface cracking;when the joints are aligned,the section of rock mass is rectangular;when the joints are staggered,the section of the rock mass is an isosceles trapezoid;when the joints are staggered,the stability of the rock beam is higher than that of the aligned joints.
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