Study On Reinforcement Mechanism Of Existing Rock Bolt

In transportation, water conservancy and city in geotechnical engineering, excavation height of 8 ~ 15 m of the rock slope of the Anchor, the use of bolt and the slab (or lattice) a combination of support form. Caused by the anchoring rock hydrogeological conditions change or be anchored rock change shape and height, resulting in mass lateral soil pressure increased significantly, while the original Anchor bolts can provide enough to balance the increased resistance lateral rock pressure, the emergence of so-called "overload" phenomenon. So many rock slope reinforcement Anchor indeed necessary.From the anchor rod, filling the body, the load transfer mechanism between the rock and the cohesive force in the rod and filling the interface, filling the body with the distribution of rock interface, combined with the anchorage bond stress distribution model test data , initially established the anchor of load - displacement curve simplified model. In considering the different failure modes of rock slope displacement size of the old and new anchor on the basis of the existing bolts are derived decline in volume under load, the new anchor shared load and lateral rock pressure increment, respectively, the new anchor sector between stiffness parameters and other parameters of the theoretical formula, which basically established anchorage reinforcement of existing geotechnical design is calculated.This article also numerical simulation software FLAC5.0 stiffness parameters for different values of bond section of new anchor bolts on both the amount of exposure to decrease the size of the impact load has been calculated, the numerical results with the theoretical formula for the new increase the value of anchoring segment stiffness under load on both the bolt down the size of the amount shown consistency.