Negative pressure type under-membrane blind ditch and soil body air pressure distribution field test method
An on-site test, negative pressure technology, applied in the direction of measuring devices, measuring fluid pressure, sea area engineering, etc., to achieve the effect of guiding exhaust design
Active Publication Date: 2022-01-18
HOHAI UNIV +1
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Problems solved by technology
Since the blind ditch and the soil will have a certain resistance to the flow of gas (that is, the air resistance phenomenon), the exhaust effect of different blind ditch designs may vary greatly, but there is no relevant test and evaluation of geomembrane membranes so far. Exhaust effect of the lower exhaust system
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Embodiment 1
[0033] A method for on-site testing of negative pressure membrane blind ditch and soil air pressure distribution, comprising the following steps:
[0034] S1. Test area construction: A plain reservoir construction site in Ningxia, select an open and flat test site, which is a square with a side length of 100m, and the buried depth of the groundwater level is 0.9-1.0m, and the line is set to determine the boundary line of the test area; Set up two mutually perpendicular blind ditches. The cross section of the blind ditch is a rectangle of 30×30cm. The longitudinal blind ditch LFD is located on the central axis, and the transverse blind ditch TFD is 30m away from the nearest lateral sideline, such as figure 1 shown; a blind ditch is laid out Geotechnical blind pipe, the cross-section is honeycomb coal, covered with a layer of 200g / m 2 geotextile; a layer of 200g / m2 is laid along the blind ditch 2 The filament geotextile is used, and gravel is backfilled around the geotechnica...
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Abstract
The invention provides a negative pressure type under-membrane blind ditch and soil body air pressure distribution field test method. The method comprises the following steps: constructing a test area, selecting an open and flat test site, and setting out to determine a boundary line of the test area; excavating blind ditches in the test area, arranging geotechnical blind pipes in the blind ditches, backfilling broken stones around the geotechnical blind pipes, and burying air pressure probes in test points in the blind ditches and the soil body; laying a sand cushion on the surface of the test area, and laying an anti-seepage geomembrane on the surface of the sand cushion; excavating a boundary ditch along the boundary line on the periphery of the test area, and sealing the peripheral edge of the geomembrane in the boundary ditch; installing air exhaust equipment; testing air pressure distribution, recording gas flow and air pressure of each test point, and calculating and analyzing air pressure distribution of the blind ditch under the membrane and the soil body. According to the test method, the air pressure distribution rule of the under-membrane blind ditch and the soil body can be measured in situ, the exhaust effect of the blind ditch can be accurately and quantitatively evaluated, and the exhaust design of the under-membrane blind ditch can be effectively guided.
Description
technical field [0001] The invention belongs to the field of water conservancy engineering, and in particular relates to a method for on-site testing of negative-pressure membrane blind ditch and soil air pressure distribution. Background technique [0002] Plain reservoirs are common control and water storage projects in the arid plains of northern my country. Most of them are located in river alluvial plains or hilly floodplains. The formations are highly permeable and prone to leakage problems. Geomembrane has been widely used in the construction of plain reservoirs in recent years because of its superior anti-seepage performance. According to the survey, many plain reservoirs in my country that use geomembrane anti-seepage have phenomena such as geomembrane inflation, floating, and bursting. The damage of geomembrane inflation not only aggravates the leakage of reservoir water, affects the cost and benefit of reservoir operation, but also may cause environmental problem...
Claims
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IPC IPC(8): G01L11/00E02B3/12E02B3/16
CPCG01L11/00E02B3/122
Inventor 丁国权袁俊平曹雪山邱豪磊胡有方吴琦沈正茂廖志彬白鹭党仕全
Owner HOHAI UNIV