77 results about "Attenuation law" patented technology

The invention provides a hydrodynamic pressure scouring test method and a device of bituminous mixture. The method comprises the following steps of: disposing a bituminous mixture test piece in a closed container and soaking in water; heating the water to a temperature to be simulated, keeping the temperature, and filling compressed air in the closed container to 0.68 to 0.7 MPa, i.e. applying positive pressure to the water and the test piece; releasing the pressure of the closed container to normal pressure, pumping the closed container to -0.095 to -0.1 MPa, i.e. applying negative pressure to the water and the test piece; and repeating steps to achieve simulation process of hydrodynamic pressure scouring of the bituminous mixture. The steps are respectively used for testing the determination index of water damage resistance of the bituminous mixture test piece. The invention can acquire the attenuation law of water damage resistance performance of the bituminous mixture and the migration law of bituminous in the mixture by applying hydrodynamic pressure to the bituminous mixture test pipe, simulating the actual condition of bituminous pavement and detecting the water stability of the bituminous mixture.

The invention discloses a method for judging a main low-frequency vibration noise source of a pumped storage power station ground. Considering basic characteristics of noise of a pumped storage power station and on the basis of analyzing a possible noise source, the background values and the noise values of the sound level A before and after unit operation and the background value and the noise value of an octave band sound pressure level are measured in an underground power house, emphasis is given to the analysis of the spectral characteristics, the background values and the noise values before and after unit operation are measured inside and outside a typical peak resident house and the field ground in a splattering mode, after the spectral characteristics of the background values and the noise values are fully compared, the noise 1/3 octave vibration acceleration level is measured, the attenuation law of noise vibration spreading and the correlation degree of possible noise sources are analyzed, and the judgment about whether the possible noise sources are main noise sources is made finally. The method solves the problem that in a traditional method, the large noise source deeply buried in an underground cave is hard to actually observe.

The invention discloses a slope model experimental method and system for researching an exploitation and blasting dynamic instability mechanism from an open pit to underground. The method comprises the following steps of manufacturing of an experimental model; loading of the experimental model, wherein an initial stress condition and different blasting vibration simulating loads of an experimentaltest block are loaded; model experiment testing. The system comprises a model manufacturing system, a model loading system and a structural plane shearing resistance strength test system, the model manufacturing system comprises an upper-lower side rock surrounding mold, a similar upper-side rock surrounding material, a similar lower-side rock surrounding material and an experimental model frame;the model loading system comprises an experimental test block initial stress state applying device and a blasting vibration simulating load applying device, and the structural plane shearing resistance strength test system comprises a stress control type shearing device, a lifting jack and a dial indicator. The slope model experimental method and system for the researching exploitation and blasting dynamic instability mechanism from the open pit to underground have the advantages that the aim of repeatable operability for simulating blasting vibration wave loading is achieved, and the attenuation law of the shearing resistance strength of the slope rock body structural plane under repeated blasting vibration effects can be objectively and visually reflected.

The invention discloses a simulation test device for a borehole wall bearing characteristic under a hydro-mechanical coupling function, comprising a simulation rock, a loading system, a seepage fieldcontrol system, a data acquisition system and a master controller; wherein the master controller is connected with the loading system, the seepage field control system and the data acquisition system.Through adoption of the simulation test device of the invention, a horizontal loading force, a vertical loading force, a concrete borehole wall axial loading force and a seepage water pressure are applied to the simulation rock, then space-time evolution laws of various physical fields are monitored by a monitoring component in a test process, and a series of on-site and laboratory parameters such as physical and mechanical properties and formation stress conditions of the concrete borehole wall, a curtain grouting body, a roof water-resisting layer, an aquifer and a bottom water-resisting layer are obtained, and similar simulation test research of ultimate bearing capacity and rheological fracture of the concrete borehole wall under the hydro-mechanical coupling function is performed, soas to obtain a time-based attenuation law of the ultimate bearing capacity of the concrete borehole wall under the hydro-mechanical coupling function.