Research on Rheological Energy Characteristics of Fractured Sandstone Strengthened with CFRP

The rheological energy characteristics and evolution law of fractured sandstone strengthened with CFRP (carbon fiber reinforced plastic) were studied to solve the problem failure rock after engineering excavation disturbance. In this paper, graded loading tests reinforcement are carried out. results show that stress increases increase area by CFRP. When is from 3140 mm2 4710 mm2, mass increased 65 MPa 75 MPa, approximately 15.4%. Except for initial stage, elastic decreasing dissipative increasing. fully released, provided total when destroyed. dissipation ratio (Ud/U) under two areas reached minimum value at stable which was 0.26 (A = mm2) 0.42 respectively. mechanism stores mainly consumes secondly before inflexion. However, switches consuming storing storage coefficient can directly describe function or arbitrary stress. T > 1, damage small. Further, reaches maximum 5 inflection point (55 MPa). < large, 0.005 40 MPa. During process CFRP, shows relationship between dissipated energy. explains working structure in plays a guiding role analysis practical engineering.