Water seal effect evaluation of underground crude oil storage caverns around rock mass with random joints

• 1、Civil Engineering School,Shandong University,Jinan 250061

Abstract：Based on the joints random distribution characteristics of the surrounding rock of the China's first large underground crude oil storage caverns, containment properties of underground crude oil storage caverns were assessed by using flow-solid coupling theory for discrete medium. This paper introduces water principle and water standards of underground crude oil storage caverns. The structural plane parameters are obtained by the indoor structural plane shear test, and structural plane parameters are checked by using Barton - Bandis shear dilatancy model. According to the joint statistical results, random joint network model of the surrounding rock is established. The groundwater pressure distribution, water inflow and surrounding rock deformation and stress distribution are analysed after the excavation under the condition of the different water curtain pressure. The results show that groundwater pressure around caverns meet water standard which the water curtain pressure is greater than or equal to 75 kPa conditions. Under the water curtain pressure of 75 kPa, water inflow rates for the caverns range from 0.003 to 0.015 m3/d and crown settlements range from 16 to 32 mm. The results provide a theoretical basis for water seal evaluation of the underground water seal oil caverns.

Keywords： underground water seal oil caverns discrete element method stress-fluid flow coupling random joints water curtain pressure shear dilatancy model water inflow