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Method for quickly measuring three-dimensional structure and scale of drilled dry karst cave at bottom of pile foundation by using laser flight time

A time-of-flight, three-dimensional structure technology, which is applied to measurement devices, uses re-radiation, and uses optical devices, etc., can solve the problems of long survey time and capital requirements, long time requirements for three-dimensional structure detection, and low three-dimensional structure detection accuracy. , to achieve high-precision measurement, reduce time and capital costs

Pending Publication Date: 2021-10-22
深圳市岩土综合勘察设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing karst cave exploration methods mainly include hydrogeological drilling, geophysical prospecting, water level survey and hydrogeochemical analysis, etc. Among them, dry karst caves can be simply photographed with a borehole camera, or the karst caves can be imaged with ultrasonic methods, etc. The detection of three-dimensional structure, but the existing detection methods of cave structure and size have the following defects: (1) the detection accuracy of three-dimensional structure is low; (2) the detection time of three-dimensional structure is longer; (3) it is specially used for Exploration time and capital requirements are more

Method used

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  • Method for quickly measuring three-dimensional structure and scale of drilled dry karst cave at bottom of pile foundation by using laser flight time
  • Method for quickly measuring three-dimensional structure and scale of drilled dry karst cave at bottom of pile foundation by using laser flight time

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Effect test

Embodiment 1

[0024] A method for rapidly measuring the three-dimensional structure and scale of a drilled dry karst cave at the bottom of a pile foundation by using laser time-of-flight, the method comprising the following steps:

[0025] (S1): Select a complex area known to have karst. During the pile foundation excavation construction in the karst area, use the drilling method to confirm that there are dry karst caves with unknown structure at the bottom of the pile foundation. The TV is used to observe the cave in the hole in situ, and at the same time to observe and describe the soil layer or core obtained by drilling, and the imaging system collects the image of the hole wall in real time, and initially obtains the data of the cave;

[0026] (S2): Use the laser time-of-flight detection device to calibrate the distance of the target object, use the infrared laser to emit a double-pulse laser with equal time (TP) and equal amplitude (A) to the object, and receive the reflected laser from...

Embodiment 2

[0030] A method for rapidly measuring the three-dimensional structure and scale of a drilled dry karst cave at the bottom of a pile foundation by using laser time-of-flight, the method comprising the following steps:

[0031] (S1): Select a complex area known to have karst. During the pile foundation excavation construction in the karst area, use the drilling method to confirm that there are dry karst caves with unknown structure at the bottom of the pile foundation. The TV is used to observe the cave in the hole in situ, and at the same time to observe and describe the soil layer or core obtained by drilling, and the imaging system collects the image of the hole wall in real time, and initially obtains the data of the cave;

[0032] (S2): Use the laser time-of-flight detection device to calibrate the distance of the target object, use the infrared laser to emit a double-pulse laser with equal time (TP) and equal amplitude (A) to the object, and receive the reflected laser from...

Embodiment 3

[0036] A method for rapidly measuring the three-dimensional structure and scale of a drilled dry karst cave at the bottom of a pile foundation by using laser time-of-flight, the method comprising the following steps:

[0037] (S1): Select a complex area known to have karst. During the pile foundation excavation construction in the karst area, use the drilling method to confirm that there are dry karst caves with unknown structure at the bottom of the pile foundation. The TV is used to observe the cave in the hole in situ, and at the same time to observe and describe the soil layer or core obtained by drilling, and the imaging system collects the image of the hole wall in real time, and initially obtains the data of the cave;

[0038] (S2): Use the laser time-of-flight detection device to calibrate the distance of the target object, use the infrared laser to emit a double-pulse laser with equal time (TP) and equal amplitude (A) to the object, and receive the reflected laser from...

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Abstract

The invention relates to the technical field of underground space detection in geotechnical engineering, in particular to a method for quickly measuring the three-dimensional structure and scale of a drilled dry karst cave at the bottom of a pile foundation by using laser flight time, which comprises the following steps of selecting a known complex region with karst, and in the excavation construction of the pile foundation in the karst region, determining that the bottom of the pile foundation contains an unknown-structure dry karst cave in a drilling mode; performing distance calibration on a target object by using a laser flight time detection device; according to the method provided by the invention, the three-dimensional structure and the scale of the drilled dry karst cave at the bottom of the pile foundation are quickly measured by using the laser flight time, and meanwhile, high-precision measurement of the three-dimensional structure and the scale of the dry karst cave is realized, so that the measurement time and the capital cost are reduced, and the defects of the existing karst cave structure and size detection method are overcome, the problems that the detection precision of the three-dimensional structure is low, the detection time of the three-dimensional structure is long, and the consumed time and money cost are high are solved.

Description

technical field [0001] The invention relates to the technical field of underground space detection in geotechnical engineering, in particular to a rapid measurement method for the three-dimensional structure and scale of a drilled dry karst cave at the bottom of a pile foundation by using laser time of flight. Background technique [0002] With the progress of urbanization in our country, more and more engineering construction areas are located in complex geological areas containing karst. Karst caves with unknown sizes and buried depths are widely distributed in karst areas, which brings great challenges to engineering construction and subsequent maintenance throughout the life of the project. Therefore, it is necessary to investigate the three-dimensional structure and scale of the dry karst cave at the bottom of the pile foundation during the construction of the pile foundation of the building, and to fill in the possible disaster sources and other preventive measures. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/86G01B11/00G01B11/02G01B11/22G01B11/06G01B11/30
CPCG01S17/86G01B11/00G01B11/02G01B11/22G01B11/06G01B11/30Y02A90/30
Inventor 刘动吴旭彬黄文彬
Owner 深圳市岩土综合勘察设计有限公司
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