The invention discloses a spring yield type energy dissipator for a slope flexible protection system and a design method. The energy dissipator comprises spring steel, a rotating shaft, a pin shaft, aC-shaped clamp and an arc-shaped lug plate. The spring steel is tightly wound on the rotating shaft, the end, provided with a hole, of the spring steel extends out for a certain distance in the tangential direction of the rotating shaft and is connected with a supporting rope of the flexible protection system through the hole, and the other end of the spring steel is welded to the rotating shaft.The pin shaft is sleeved with the rotating shaft, a small gap is reserved, the pin shaft is connected with upper and lower clamp flange plates of the C-shaped clamp through bolts, the arc-shaped lugplate is welded to a C-shaped clamp web, and a lug plate reserved hole is connected with another supporting rope of the flexible protection system. When the flexible protection system is impacted, thespring steel connected with the corresponding supporting rope is pulled and rotated around the rotating shaft, the spring steel is changed into a straightened state from a bent state, and energy is dissipated through plastic deformation of the spring steel. After impact, the spring steel can be coiled into a spring shape around the rotating shaft from the straightened state for repeated use. Theenergy dissipator is reasonable in structural design, clear in energy dissipation mechanism, high in energy dissipation capability, convenient to disassemble, assemble and maintain, suitable for narrow space installation and capable of being repeatedly used.

Spring yield type energy dissipator for slope flexible protection system and design method

The invention provides a two-stage energy dissipation type shed tunnel supporting structure connected by adopting the bucket arch principle and a design method thereof. The two-stage energy dissipation type shed tunnel supporting structure comprises bucket arch joint domains, cross beams and stand columns. Each bucket arch node domain comprises profile steel components, waveform wall surface columnar elastic-plastic buffers, a U-shaped sliding connecting groove and a high-strength bolt. The profile steel components are orthogonally stacked in multiple layers to form a bucket arch shape, the waveform wall surface columnar elastic-plastic buffers are arranged between the adjacent layers of profile steel components, the U-shaped sliding connecting grooves are formed in the upper ends and thelower ends of the buffers, and the buffers are connected with profile steel in two orthogonal directions. Under the action of small-energy rockfall impact, buffering can be achieved through elastic deformation of the bucket arch joint domain, and under the action of large-energy rockfall impact, energy consumption can be achieved through elasticoplastic deformation and friction sliding of the bucket arch joint domain, so that the two-stage buffering capacity is achieved, and a novel energy consumption supporting structure of the rockfall protection shed tunnel is formed.

Two-stage energy dissipation type shed tunnel supporting structure connected by adopting bucket arch principle and design method thereof

The invention discloses an arbitrary-shaped fabricated test block for a high-steep slope rolling stone test. The arbitrary-shaped fabricated test block for the high-steep slope rolling stone test comprises a connecting square barrel and test block bodies; the connecting square barrel is formed by a steel plate in an enclosing manner; the periphery of the steel plate is provided with connecting grooves; each connecting groove is provided with connecting groove bolt holes; the test block bodies are printed on a printing base through a 3D printing technology; the printing base is further fixedlyprovided with connecting plates; each connecting plate is provided with connecting plate bolt holes; the high-strength bolts penetrate through the connecting groove bolt holes and the connecting platebolt holes to connect the test block bodies to the connecting square barrel; and a sensor box is fixedly arranged on the inner side of the connecting square barrel, and a sensor is arranged in the sensor box. For the arbitrary-shaped fabricated test block for the high-steep slope rolling stone test, the size and the shape of the test block can be simulated according to field measurement on dangerous rocks and boulders, and a 3D printed material is selected according to the physical characteristics of the rocks, so that the rolling and impact process of rolling stones on a slope can be more accurately simulated during the test.

Arbitrary-shaped fabricated test block for high- steep slope rolling stone test

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Spring yield type energy dissipator for slope flexible protection system and design method

Two-stage energy dissipation type shed tunnel supporting structure connected by adopting bucket arch principle and design method thereof

Arbitrary-shaped fabricated test block for high- steep slope rolling stone test