Construction method of underground damping wall
A construction method and trench technology, applied in building structures, buildings, building components, etc., can solve the problems of weakened vibration reduction effect of shock absorption trenches, dynamic response duration, differences in spectral attenuation characteristics, etc. The effect of strong compression performance and low wave impedance
Inactive Publication Date: 2017-10-03
WUHAN UNIV
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Problems solved by technology
However, the propagation characteristics of the seismic wave are closely related to its propagation medium. When the blasting vibration passes through the propagation medium, the different original structural characteristics of the propagation medium will lead to a large difference in the dynamic response in the corresponding duration, frequency spectrum, and response attenuation characteristics.
Generally speaking, the shock absorption ditch can eliminate 30% to 70% of the seismic wave energy, but when encountering a medium with a large water content, the vibration reduction effect of the shock absorption ditch will be greatly weakened
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Embodiment 1
[0031] The vibration-absorbing effect test of the underground vibration-damping wall was carried out in a small-scale building demolition blasting project. Choose a relatively flat site around the building, and set a vibration-reducing trench with a length of 15m, a width of 3m, and a depth of 10m at a distance of 10m from the seismic source. Arrange two rows of pre-splitting holes along the length of the vibration damping groove, with a row spacing of 3m, a hole spacing of 1m, a hole depth of 11m, and a plugging section length of 1.5m. A φ32mm powder roll is used for conventional charging in the holes. A row of main blasting holes is drilled in the middle of the two rows of pre-splitting holes. The hole distance is 4m, the hole depth is 12m, and the length of the plugging section is 1.8m. The φ70mm charge coil is used in the hole to charge the charge in 3 sections. From top to bottom, MS1, MS3, MS5 millisecond delay detonator. Polyurethane foam is used as filling. A measuri...
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Abstract
The invention discloses a construction method of an underground damping wall and applies to blasting construction in municipal projects, water conservancy and hydropower projects, mine projects and the like. The method comprises: designing a damping trench according to damping requirements of a subject under protection; drilling two rows of pre-fracturing holes and a row of main blasting holes along the contour of the trench to perform blasting excavation, forming a trench filled with broken rock; injecting foam material into the trench to fill gaps among the broken rock to form the underground damping wall using the mixture of foam material and broken rock as a body. Compared with traditional damping trenches, the construction method has the advantages that the mixture of foam and broken rock is highly compressible, seismic wave experiences great reflection and diffraction at the damping wall by the aid of low wave impedance, energy of transmissive wave is weakened, the influence of blasting shock upon the subject under protection is relieved, and the stability of rock on two sides of the trench is maintained; as the foam material in the damping wall is impervious to water, the influence of underground water upon the safety of the subject under protection can be decreased.
Description
technical field [0001] The invention relates to the field of blasting protection engineering, in particular to a method for constructing an underground damping wall. Background technique [0002] With the acceleration of urban modernization worldwide, demolition blasting technology has been widely used due to its advantages of high efficiency and economy. When demolition blasting is carried out in a densely populated urban area with many buildings, the damage caused by the ground vibration generated by the blasting and the ground vibration of the building collapse to the surrounding buildings and other facilities cannot be ignored. Existing measures to control blasting vibration mainly start from the blast source and propagation path, and the commonly used measure is to excavate shock-absorbing trenches. However, the propagation characteristics of seismic waves are closely related to their propagation medium. When the blasting vibration passes through the propagation medi...
Claims
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Login to View More IPC IPC(8): E04B1/98E04G21/00
CPCE04B1/98E04G21/00
Inventor 陈明邓珂卢文波严鹏王高辉
Owner WUHAN UNIV