Abstract
Under the influence of groundwater, the surrounding rock of the tunnel with cracks has a significant deterioration effect, which is easy to cause the instability and damage of underground projects. Uniaxial compression and acoustic emission tests were carried out on dry and saturated limestone specimens under different osmotic pressures. From the perspective of water rock coupling, the peak strength, characteristic stress, failure characteristics, acoustic emission characteristics and the deterioration mechanism of seepage water were analyzed. Taking mode I open crack as the research object, the influence of seepage pressure, fracture rock parameters (fracture dip, Poisson's ratio, fracture length) on the tip plastic zone growth is analyzed by using D-P yield criterion. The results show that water bearing state and osmotic pressure have little influence on fracture form, but have obvious influence on macro fracture development. With the increase of osmotic pressure and internal friction angle, the radius of plastic zone also increased significantly. The increase of Poisson's ratio will reduce the radius of plastic zone.
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