Elastoplastic Stress Analysis for Water-bearing Surrounding Rock of Water Pressure Tunnels under Concentrate Drainage Working Conditions

According to "The Design Standard SDB 4-84 for Hydraulis Pressure Tunnels" and Consider the Water pressure being field force, more over, the loading history of hydraulic pressure on the surrounding rock is taken into account. A thorough discussion on the pressure distribution is given in this paper. The writer presents a stress analysis method of tunnel lining and surrounding rock with concentrate drains under construction stage and operating period by elastoplastic theory .The corresponding Cal-culatrion formulars are recommended.