A field test method for blind ditch and soil air pressure distribution under negative pressure membrane
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: 2022-08-02
HOHAI UNIV +1
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0033] A negative pressure type membrane blind ditch and soil air pressure distribution field test method, comprising the following steps:
[0034] S1. Test area construction: a plain reservoir construction plot in Ningxia, an open and flat test site is selected, which is a square with a side length of 100m, the groundwater level is buried at a depth of 0.9-1.0m, and the line is set to determine the boundary line of the test area; excavation in the test area Set up two mutually perpendicular blind grooves, the cross section of the blind groove is a rectangle of 30×30cm, the longitudinal blind groove LFD is located on the central axis, and the transverse blind groove TFD is 30m away from the nearest lateral edge, such as figure 1 shown; a blind ditch is arranged The geotechnical blind pipe, the section is honeycomb-like, and the outer layer is 200g / m 2 geotextile; a layer of 200g / m2 is laid along the inner edge of the blind ditch 2 The filament geotextile is backfilled with ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
The invention provides an on-site testing method for blind ditch and soil air pressure distribution under a negative pressure type membrane. Blind ditch is set, geotechnical blind pipe is laid in the blind ditch, gravel is backfilled around the geotechnical blind pipe, air pressure probes are buried in the blind ditch and the test point in the soil; sand cushion is laid on the surface of the test area, and anti-seepage geomembrane is laid on the surface of the sand cushion; test Boundary ditch is excavated along the boundary line at the periphery of the area, and the geomembrane is enclosed in the boundary ditch along the periphery; air extraction equipment is installed; the air pressure distribution test is performed, the gas flow rate and the air pressure at each test point are recorded, and the blind ditch under the membrane and the soil air pressure distribution are calculated and analyzed. The testing method of the invention can measure the air pressure distribution law of the blind ditch under the membrane and the soil body in situ, accurately and quantitatively evaluate the exhaust effect of the blind ditch, and effectively guide the exhaust design of the blind ditch under the membrane.
Description
technical field [0001] The invention belongs to the field of water conservancy engineering, and in particular relates to a negative pressure type membrane blind ditch and a field test method for air pressure distribution of soil. Background technique [0002] Plain reservoirs are common water storage projects in arid plains in northern my country. Most of them are located in river alluvial plains or hilly piedmont flooded areas. The stratum is highly permeable and prone to leakage problems. Geomembrane has been widely used in the construction of plain reservoirs in recent years due to its excellent anti-seepage performance. The survey shows that at present, many plain reservoirs in my country that use geomembrane anti-seepage, there have been geomembrane air expansion, floating, bursting and other phenomena. Geomembrane inflation damage not only aggravates reservoir water leakage and affects reservoir operation costs and benefits, but also may cause environmental problems c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
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