7 results about "Load displacement" patented technology

This invention discloses a method for determining the loosening load of the bearing arch in mega-span tunnels based on plastic zone parameters, relating to the field of geotechnical engineering and underground engineering support design technology. The method includes the following steps: inputting tunnel and support parameters; obtaining the height of the plastic zone at the arch crown through numerical simulation; calculating the equivalent thickness of the bearing arch formed by the system anchors; determining the equivalent loosening load height; calculating the vertical loosening pressure; determining the lateral pressure coefficient based on the surrounding rock strength index; calculating the non-uniformly distributed horizontal loosening pressure; and cyclically outputting the verified load through load displacement verification. This invention directly incorporates the plastic zone development state into the load calculation and establishes a self-correction mechanism, achieving refined and dynamic determination of the loosening load, thus improving the safety and economy of mega-span tunnel support design.

This invention relates to a method for determining the load-bearing capacity of anchor bolts considering cementation damage behavior, belonging to the field of roadway surrounding rock control. The method includes calculating and determining the normal compressive stress at the anchorage interface between the anchor bolt and the anchoring agent; calculating the anchor bolt load-bearing capacity envelope, which is composed of the load-bearing capacity generated by the shear dilatation of the ribbed section of the anchor bolt and the load-bearing capacity generated by the cohesive force of the anchoring agent; dividing the anchor bolt loading process into two stages, including a pre-peak stage and a post-peak stage, defining the dynamic shear dilatation angle of the anchorage interface and the method for determining the cohesive force of the anchoring agent for the pre-peak and post-peak stages respectively; calculating the anchor bolt load-bearing capacity; and summarizing the calculated anchor bolt load-bearing capacity and the anchor bolt loading displacement results to plot the relationship curve between the anchor bolt load-bearing capacity and the anchor bolt loading displacement. Based on this invention, the load-bearing capacity of anchor bolts can be accurately calculated and the influence of cementation damage behavior on the load-bearing capacity of anchor bolts can be clarified, which is of great significance for revealing the anchoring mechanism of anchor bolt support.

This product is a gap filler member for anchors used in displacement-suppressing anchors that suppress displacement caused by loads on driven anchors. When load displacement occurs in the main anchor 1 of a driven anchor, which is mainly used on slopes, as shown in the first reference figure (before displacement) and the second reference figure (after displacement), the auxiliary anchor 2 contacts the main anchor 1 and resists the displacement, receiving the external force acting on the main anchor 1, and moves in a direction having a directional component substantially perpendicular to the displacement direction (arrow) of the main anchor 1 so that the two cylindrical parts 2a and 2b move away from each other, thereby distributing the external force acting on the main anchor 1 to the surrounding ground and suppressing the amount of displacement of the main anchor 1. As shown in the first reference diagram (before displacement) and the third reference diagram (both showing the state of use), this item is placed in the gap created during anchor installation between the two cylindrical parts 2a and 2b of the auxiliary anchor and the main anchor 1. It fills this gap, so that when the main anchor 1 is displaced by an external force acting on the main anchor 1, a load is applied to the auxiliary anchor 2 without any time lag from the very beginning.

This product is an auxiliary anchor that suppresses the displacement of driven anchors due to load. This product is mainly used on slopes, and as shown in the first and second reference diagrams showing the state of use, the two cylindrical parts of the auxiliary anchor are positioned on either side of the direction (arrow) in which the central anchor is displaced when in use. When load displacement occurs in the anchor, as shown in the third and fourth reference diagrams showing the state of use, the auxiliary anchor contacts the anchor to resist its displacement and absorbs the external force acting on the anchor, while moving in a direction that has a component approximately perpendicular to the direction of the anchor's displacement, so that the two cylindrical parts move away from each other, thereby distributing the external force acting on the anchor to the surrounding ground. At this time, the range of movement of the cylindrical parts is restricted by a stopper. With this product, anchors used for holding fences, etc., can be installed even in soft ground (e.g., N-value of 4 or less) with boulders or bedrock present.

The present application belongs to the technical field of vehicle simulation and relates to a positive design method for preventing the disengagement of a shock absorber sleeve; under the condition of defining the design target of the sleeve pull-out force, based on the test data of the sleeve pull-out force bench, in combination with the finite element model of the shock absorber fork, sleeve and bolt assembly, the real friction coefficient between the shock absorber fork and the sleeve is calibrated, the finite element model is corrected, the pull-out force of the sleeve is calculated based on the corrected finite element model by using the load displacement curve method, the bolt pre-tightening force is back calculated, the appropriate standard bolt is matched, the positive design is realized, the problem that the simulation result of the sleeve pull-out force is small and leads to design redundancy is solved, the problem that the simulation result of the sleeve pull-out force is large in simulation and leads to the disengagement of the sleeve in the vehicle test is solved, and the simulation result of the sleeve pull-out force is more accurate.

This product is a displacement-suppressing anchor that suppresses displacement caused by the load of a driven anchor. This product is mainly used on slopes, and when in use, as shown in the first reference diagram (before displacement) showing the state of use, the two cylindrical parts 2a and 2b that form the auxiliary anchor 2 are positioned on both sides of the direction (arrow) in which the central anchor 1 is displaced. When load displacement occurs in anchor 1, as shown in the second reference diagram (after displacement) showing the state of use, the two cylindrical parts 2a and 2b of the auxiliary anchor 2 come into contact with anchor 1 via the filler material 3, resisting the displacement of anchor 1 and moving away from each other while receiving the external force acting on anchor 1. That is, they move in a direction having a directional component approximately perpendicular to the direction of displacement of anchor 1, distributing the external force acting on anchor 1 to the surrounding ground and suppressing the amount of displacement of anchor 1. With this product, anchors used for holding fences, etc., can be installed even in soft ground (e.g., N-value of 4 or less) with boulders or bedrock.

This product is a displacement-suppressing anchor that suppresses displacement caused by the load of a driven anchor. This product is mainly used on slopes, and when in use, as shown in the first reference diagram (before displacement) showing the state of use, the two cylindrical parts 2a and 2b that form the auxiliary anchor 2 are positioned on both sides of the direction (arrow) in which the central anchor 1 is displaced. When load displacement occurs in anchor 1, as shown in the second reference diagram (after displacement) showing the state of use, the two cylindrical parts 2a and 2b of the auxiliary anchor 2 come into contact with anchor 1 via the filler material 3, resisting the displacement of anchor 1 and moving away from each other while receiving the external force acting on anchor 1. That is, they move in a direction having a component in a direction substantially perpendicular to the direction of displacement of anchor 1, distributing the external force acting on anchor 1 to the surrounding ground and suppressing the amount of displacement of anchor 1. At this time, the range of movement of the cylindrical parts 2a and 2b is restricted by the stopper bolts that connect them. With this product, anchors used for holding fences, etc., can be installed even in soft ground (e.g., N-value of 4 or less) with boulders or bedrock.