3 results about "Elastic wave velocity" patented technology

The application discloses a kind of embankment quality elastic wave tomography detection methods, comprising: synchronous acquisition compactor vibration source at source end reference signal and the ground surface response signal of measured region surface, establish the unified time base of both;Correlation function of source end reference signal and ground surface response signal is calculated, and the coarse estimation time is determined based on peak value.Extract feature frequency component from signal and obtain analytic signal phase information, calculate the phase difference of ground surface response signal at coarse estimation time relative to source end reference signal, and use the phase difference to determine fine time correction amount.Use fine time correction amount to correct coarse estimation time, obtain final elastic wave time and generate elastic wave velocity distribution image by inversion.The application breaks through the limitation of sampling rate on measurement accuracy by collecting real source end waveform and combining phase refinement technology, and improves the resolution and reliability of compaction quality detection.

The application discloses a karst collapse hidden danger area multi-method cooperative detection method and system, relates to the technical field of geographic detection, and comprises the following steps: arranging an observation network in a target hidden danger area, respectively implementing an electric excitation sequence and a mechanical vibration excitation sequence, collecting potential difference data and vibration waveform data, inverting the potential difference data and the vibration waveform data at each collection time, analyzing the phase relationship and the change form of the resistivity sequence and the elastic wave velocity sequence with respect to the corresponding excitation time sequence, and dividing the area into regions with different response characteristics according to the characteristic differences of the multi-physical field dynamic response modes in space. The application can extract the multi-physical field dynamic response mode representing the dynamics process such as groundwater seepage and particle migration, realize direct description of the dynamics process activity and evolution time sequence in the hidden danger area, and improve the ability of identifying the hidden danger development stage from the physical response.

The application discloses a method for rapidly simulating three-dimensional scattered waves in a sound wave far detection transversely isotropic stratum, and belongs to the field of seismic wave forward simulation. The application is used to solve the technical problem that it is difficult to efficiently and universally simulate three-dimensional scattered waves in single well imaging of the transversely isotropic stratum in the prior art. The application comprises the following steps: obtaining parameters required for simulation; deriving an analytical solution of a sound source far field wave under a transversely isotropic medium according to a steepest descent integral method, and obtaining an incident wave field, wherein saddle points of quasi-SV waves and quasi-P waves are solved by using a Newton-Raphson method; establishing an elastic wave velocity-stress staggered grid, introducing the incident wave field into a calculation space boundary by using a total field / scattered field technology, and performing numerical simulation on a local region containing a scatterer to obtain a near field scattered wave field; calculating a virtual source wave field based on the analytical solution; and converting the near field scattered wave field and the virtual source wave field into a scattered wave field at a position of a well receiver based on a fluid-solid coupling reciprocity theorem. The application is suitable for a transversely isotropic medium with arbitrary parameters.