Study of seepage generation technology in excavation process based on 3D geo-mechanical model

摘要

Seepage is one of the key factors which affect the stress and deformation of surrounding rock in excavation process. By combining 3D geo-mechanical model test for the diversion tunnel of Jinping II Hydropower Station, two hydraulic servo-controlled water supply schemes are designed. The discrete holey tube seepage generation system is optimized and selected for solving the percolating water question among the test bench retaining plate system, the mini-type multi-point extensometer transfer rod and the support sleeve. Based on discrete multi-principal stress plane, a new loading technology which has waterproof function is brought forward to make sure to generate the initial stress field while no seepage in assembly airbag steel sleeve and the wire hole of data collection equipment. The high simulation of seepage field is realized.