The Study On Anchoring Effect Of Fractured Rock Mass On Numerical Simulation

There are too many discontinue planes in natural rock mass, because of geological tectonic activity, such as joint plane, fault plane, fault and other forms of geological structures. The existence of discontinuities makes the mechanical properties of rock has been greatly weakened, which had made the great hidden risk to construction engineering. Rock bolting is the most effective and economical means of supporting excavations in rock. In recent years, with the anchoring technology has improved steadily, it has showed more and more vitality in the area of reinforcement in the geotechnical engineering. However, the mechanical properties of jointed rock have not fully understood, and a number of construction works generally rely on the experience. Though many researchers have done a lot of research experiments, the theory of anchoring technology still has a longl way behind the advances in technology, because the own shortcomings in model experiments.In the element-free Galerkin methods, the trial and test function are constructed by moving least-squares interpolants. The governing equations are obtained by a Galerkin variational principle of energy functional. Penalty functions are instroduced to enforce the essential boundary condition. The method has the advantages of the high accurate calculation and easy post-processing. So the EFGM has the unique advantage in dealing with crack growth problem.Maximum circumferential tensile stress criterions have been selected to as the appropriate crack growth criterion. The element free Galerkin method is used to simulate the first crack propagation of the rock mass under the pressure according to the criterion. And the results agree with the results of classical theory. So, the method has the accurate calculation in solving the crack propagation, and is valued to be developed and applied. On these basis, the element free Galerkin method is used to simulate the first crack propagation of the rock mass under the stretch.From the energy standpoint, the amended EFGM equations has been got on the basis of have deduced the deformation energy include the CFRP. The model of anchor by CFRP at the middle place has been simulated to verify the feasibility of the formula and programes. The increase in mechanical properties has been calculated the rectangular plate with CFRP reinforced, and still studied the relation between elastic modulus of CFRP and mechanical properties of the model.Research focused on the application of EFGM considering the existence of CFRP on the crack growth. First of all, the study on the crack tip stress field under the model anchored by CFRP have been done,and then do a brief introduction about the failure mode of the model with the CFRP. The paper still come up some suggestion about the later work. Analysis the anchoring effect of model in several different anchoring approach about reinforcement place and angle.