An experimental system for out-of-plane seismic performance of a masonry block wall, comprising: a static test bed (1), a lateral limiting system disposed on one side on the static test bed (1), and a transverse load system disposed on the other side on the static test bed (1), a masonry block wall to be tested (401) being disposed between the lateral limiting system and the transverse load system. The experimental system also comprises a vertical load system disposed above a wall. Also provided is an experimental method using the experimental system for out-of-plane seismic performance of a masonry block wall, on the basis of a quasi-static test method, a horizontal reciprocating actuator is used to simulate an out-of-plane seismic load action; quarter-point loading is implemented by means of a multi-stage shear stress distribution apparatus, then a force is transmitted to a second screw rod (602), and the second screw rod (602) fits an out-of-plane uniformly distributed load into four horizontally-equidistant transversely-concentrated forces and transmits same to a test piece. The present invention has the characteristics of a clear force transmission path, uniform stress distribution, high experimental precision and an accurate result, such that the study of the out-of-plane seismic performance of a component is more accurate and reliable.

An experimental system for out-of-plane seismic performance of a masonry block wall, comprising: a static test bed (1), a lateral limiting system disposed on one side on the static test bed (1), and a transverse load system disposed on the other side on the static test bed (1), a masonry block wall to be tested (401) being disposed between the lateral limiting system and the transverse load system. The experimental system also comprises a vertical load system disposed above a wall. Also provided is an experimental method using the experimental system for out-of-plane seismic performance of a masonry block wall, on the basis of a quasi-static test method, a horizontal reciprocating actuator is used to simulate an out-of-plane seismic load action; quarter-point loading is implemented by means of a multi-stage shear stress distribution apparatus, then a force is transmitted to a second screw rod (602), and the second screw rod (602) fits an out-of-plane uniformly distributed load into four horizontally-equidistant transversely-concentrated forces and transmits same to a test piece. The present invention has the characteristics of a clear force transmission path, uniform stress distribution, high experimental precision and an accurate result, such that the study of the out-of-plane seismic performance of a component is more accurate and reliable.

A seismic source system uses at least one seismic source, a screw in piling ground anchor installed into the earth/ground and means of coupling the energy from the seismic source to the screw in piling ground anchor.

A seismic source system uses at least one seismic source, a screw in piling ground anchor installed into the earth/ground and means of coupling the energy from the seismic source to the screw in piling ground anchor.

Systems and methods for vibration attenuation, and for investigating a subsurface volume of interest from a borehole. System embodiments may include a vibration attenuation system, comprising: at least one vibration attenuator configured to dynamically isolate a vibration source, the at least one vibration attenuator comprising metamaterial defining a plurality of cells; wherein at least one cell of the plurality of cells comprises a plurality of sub-cells azimuthally arrayed about an axis of alignment, and at least one sub-cell of the plurality is defined by a solid, the at least one sub-cell including a plurality of cell segments substantially oriented in alignment with a mapping geometry comprising an inversion of a canonical tangent circles mapping. The vibration source may comprise an acoustic source. The system may have an enclosure having the acoustic source and the at least one receiver disposed therein, with the at least one acoustic attenuator is positioned between.

Systems and methods for vibration attenuation, and for investigating a subsurface volume of interest from a borehole. System embodiments may include a vibration attenuation system, comprising: at least one vibration attenuator configured to dynamically isolate a vibration source, the at least one vibration attenuator comprising metamaterial defining a plurality of cells; wherein at least one cell of the plurality of cells comprises a plurality of sub-cells azimuthally arrayed about an axis of alignment, and at least one sub-cell of the plurality is defined by a solid, the at least one sub-cell including a plurality of cell segments substantially oriented in alignment with a mapping geometry comprising an inversion of a canonical tangent circles mapping. The vibration source may comprise an acoustic source. The system may have an enclosure having the acoustic source and the at least one receiver disposed therein, with the at least one acoustic attenuator is positioned between.

Introduced herein are system and method for precisely determining the actual location of a standing wave created within a wellbore as well as other key properties about the created wave. The introduced system and method utilize a fiber optic sensing system, such as fiber optic Distributed Acoustic Sensing (DAS) system, that actively interrogates and monitors fiber optic sensors along the length of a wellbore. The introduced system and method generate one or more pressure pulses that combine with one another to create a standing wave within a wellbore and process the acoustic response of the standing wave using the fiber optic DAS system over a wide range of frequencies. Based on the measurements, the introduced system and method determine the actual location of the created standing wave and move it to a desired location within the wellbore by adjusting one or more properties of the pressure pulses.

Introduced herein are system and method for precisely determining the actual location of a standing wave created within a wellbore as well as other key properties about the created wave. The introduced system and method utilize a fiber optic sensing system, such as fiber optic Distributed Acoustic Sensing (DAS) system, that actively interrogates and monitors fiber optic sensors along the length of a wellbore. The introduced system and method generate one or more pressure pulses that combine with one another to create a standing wave within a wellbore and process the acoustic response of the standing wave using the fiber optic DAS system over a wide range of frequencies. Based on the measurements, the introduced system and method determine the actual location of the created standing wave and move it to a desired location within the wellbore by adjusting one or more properties of the pressure pulses.

Methods of mapping a subterranean formation using imploding particles are described. In some cases, the particles contain a material that generated a gas which passes through a water-insoluble coating to create a void within the particle. In some aspects, the implosive particles have a coating that dissolves in the subterranean formation.

Methods of mapping a subterranean formation using imploding particles are described. In some cases, the particles contain a material that generated a gas which passes through a water-insoluble coating to create a void within the particle. In some aspects, the implosive particles have a coating that dissolves in the subterranean formation.