Abstract
In this paper failure process of rock mass with a natural joint is presented by numerical simulation based on RFPA 2D. numerical simulation shown that failure of rock mass with a natural joint begin first in joint for rock mass, with the increase of the vertical load, joint is closed, along the joint plane within the rock mass near the damage area, rock mass became damaged gradually near joint, the damage area expands unceasingly, then cave is formed. That provided location and avenue for movement and accumulation of underground water .That is of significance and valuable to research strength for jointed rock mass and to research mechanism of propagation and coalescence and evolvement of joints in rock mass and to research mechanism of mine water and gas outburst in underground mining and to research catastrophe and bifurcation of non Darcy flow system in post failure of rock mass. Numerical simulation shown that when angle between the joint plane and horizontal plane is 30 0 , and when the lateral pressure is 1 Mpa, compressive strength of rock mass with a natural joint is compressive strength of 25.9% without joint.
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