Excitation device and method for downhole seismic testing using the same

Abstract

An excitation device for downhole seismic testing, includes an excitation hammer, a holding arm connected at one end thereof to the excitation hammer to allow the excitation hammer to rotate about the other end thereof, a support post having the other end of the holding arm rotatably coupled to an upper end thereof to support the excitation hammer and the holding arm at a certain height, and an excitation source configured to allow the support post to stand upright on the upper side thereof and which generates a seismic wave when struck by the rotated excitation hammer. The support post is formed at a lower end thereof with a securing section detachably inserted into a groove for the support post formed on the upper side of the excitation source such that the support post, the holding arm, the excitation hammer and the excitation source can be separated from each other.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an excitation device and method for downhole seismic testing using the same, and more particularly, to an excitation device for downhole seismic testing, which is installed on the ground to generate seismic waves with efficiency and accuracy and allows separation into individual units for convenient carriage and secure installation, and a method for downhole seismic testing using the same.[0003]2. Description of the Related Art[0004]For efficient management of water that is essential for human life and industrial development, structures, such as dams, reservoirs, seawalls, banks, and the like, can be built not only with reinforced concrete, but also in the form of an embankment structure through construction of earth materials such as soil, sand, rock, and the like.[0005]The crest of the embankment structure constructed of the earth materials is generally paved with asphalt, concrete or ...

AI Technical Summary

Benefits of technology

The present invention is about a device and method for downhole seismic testing that can be easily assembled and disassembled for convenient carriage. It also maximizes the energy of the seismic waves while ensuring their orientation, and provides test data for multiple purposes by varying the intensity of the energy. Additionally, it uses an existing observation hole to observe underground water levels, instead of constructing a separate test hole, which improves the reliability of stability testing of target ground.

Problems solved by technology

Even in this case, however, stability of a target structure or the surrounding ground and structures can change during construction of the structure or over time due to abnormal variation of material or design factors, unpredicted inner or outer factors, and the like.

Nevertheless, periodic and continuous measurement and evaluation of the shear wave velocity for most ground materials which require stability has never been taken into consideration.

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