Numerical Simulation Of Mechanical Properties Of Anchored Rock Mass

Rock’s macroscopic mechanical properties greatly reduced because of the existence of joints. This is a big challenge to the design of support engineering. Bolt support technology is widely used by civil engineers because of the characteristics of such as safe and reliable, economical and practical. Although the technology has developed more than one century, the system study of the anchor’s reinforcement is still lacking. Pull-out test is one of the anchored rock mass mechanics’s basic tests which could provide reference to anchor’s structure parameter and technology. Shearing test is important to the study of anchor’s reinforcement to the weak plane. In this paper, we’ll study the mechanical properties of rock mass anchored by fully cement-imbeddcd anchor.In order to simulate the pull-out test of the anchored rock mass and shear test of rockbolt jointed rock mass to get failure characteristics, ultimate load and deformation parameter, we use RFPA system to study the mechanical properties of anchored rock mass in different influence factors, then we could reveal the transfer rule and reinforce mechanism of anchor’s interal force. Not only could we take meso fracture behavior into consideration, but also simulate the macro fracture and take the whole-part relation among rock, binding material and anchor into account.In this paper, pull-out test is contrasted with Phillips Theory and other’s physical experiment to verify the feasibility of models. Then we’ll take physical test into consideration to design the numerical orthogonal experiment. The numerical results will be analysised by mathematical statistics, and then we compare with the physical results to study the relationship between pulling resistance and others, we summary the desructional form and characteristic at last. With this foundation above, the influence of separation among the anchors and anchor group’s effect is simulated, system study the mechanical property of anchor group under drawing or shearing to reveal the different characteristic with single anchor’s structural.In the shear experiment, we discuss the shear capability of rockbolt jointed rock masses. Study the rockbolt jointed rock masses by grouting, the influence of anchor’s inclination and the relationship between the fluctuated joint and anchor’s inclination. It shows that the jointed rock is strengthened by the anchor. Less the anchor’s dip angle is, higher the shear capacity. But this exchange is a sacrifice of anchor’s pull-out capacity. When the jointed plane’s undulating angle is 17°, the one of anchor’s dip angle α=45° works best. In order to improve the rock’s shear capacity, we could raise the number of anchor or grout to the joint.According to these studies, we have a good learn of mechanical properties of anchored rock mass. I wish this paper would give powerful references to anchoring scheme and allocation design.