Profound unconsolidated formation visualized detection method
A detection method and loose layer technology, which can be used in measurement devices, optical exploration, material analysis by optical means, etc., and can solve problems such as collapse of deep loose layers.
Active Publication Date: 2010-04-14
长江三峡勘测研究院有限公司(武汉)
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[0005] The purpose of the present invention is to accurately find out the physical characteristics of the loose layer in engineering survey, and provide a visual detection method of the deep loose layer, which effectively solves the problem of hole collapse in the deep loose layer during the drilling process. Camera can truly and intuitively understand the material composition and structural characteristics of the loose layer
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[0018] From March 1 to March 27, 2008, ZK52# borehole was drilled in the riverbed of Wudongde Hydropower Station on the Jinsha River. The loose layer was sand interbedded with pebbles and block stones, with a thickness of 60.80m. In the drilling of loose layers, the conventional drilling process and wall protection method are adopted, the opening diameter is Φ130, and the final hole diameter is Φ91, such as figure 1 shown. The wall protectors made of high-transparency PMMA tubes with a light transmittance of more than 92.8% are lowered in sections from bottom to top, and the length of the wall protectors is generally about 4 meters each time. After the wall protector is lowered, the hole is washed, and then the TV camera in the hole is carried out. Clear, real, in-situ geological data of unconsolidated layers such as Figure 2a , Figure 2b .
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Abstract
The invention relates to a visual detection method for a deep loose bed. The method comprises the following steps: A. drilling is performed on the loose bed by adoption of the general drilling and wall retaining method, namely one section of steel pipe retaining wall is followed when one section is drilled; the steel pipe retaining wall is followed to the bottom of a hole, and then a wall retaining machine is run to the inside of the hole by the up-down means or the down-up means; an outer steel pipe is lifted out on a hole section for pickup; B. the hole section with the wall retaining machine is cleaned; C. after cleaning, pickup is performed on the hole section in which the wall retaining machine is positioned. The method successfully manufactures a high transparent PMMA pipe into the wall retaining machine and uses the general drilling technique to drill the deep loose bed, and then obtains the geological materials of the loose bed, thereby effectively solving the problem of hole collapse of the deep loose bed during the drilling process; moreover, the material compositions and the structural characteristics of the loose bed can be known really and intuitively through the pickup, and the method is a great breakthrough of the drilling technique for the deep loose bed.
Description
technical field [0001] The invention relates to a visual detection method for deep and thick loose layers in engineering investigation. Background technique [0002] Deep loose rock and soil layer is a kind of medium that human engineering activities often face. In the process of engineering construction, how to explore and find out the spatial distribution, material composition, structural characteristics, physical and mechanical properties of this medium is an important technical problem in the field of engineering investigation. [0003] The deep loose layer is generally composed of sand, mud with pebbles and block stones. In this type of formation exploration, due to its looseness and inhomogeneity, boreholes are prone to collapse. In addition to drilling difficulties, it is difficult to obtain real geological data of loose layers, which has always been the main technical problem in geological exploration. Especially in the western provinces of my country, most of the...
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IPC IPC(8): G01N21/84G01V8/02
Inventor 满作武李汉桥何铁汉鹿明轩向家菠郝文忠田健田世德
Owner 长江三峡勘测研究院有限公司(武汉)
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