CN202869938U - Constant head soil layer permeability coefficient tester - Google Patents
Constant head soil layer permeability coefficient tester Download PDFInfo
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- CN202869938U CN202869938U CN2012205797844U CN201220579784U CN202869938U CN 202869938 U CN202869938 U CN 202869938U CN 2012205797844 U CN2012205797844 U CN 2012205797844U CN 201220579784 U CN201220579784 U CN 201220579784U CN 202869938 U CN202869938 U CN 202869938U
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Abstract
The utility model discloses a constant head soil layer permeability coefficient tester, to solve the problem of testing of soil layer permeability coefficients. The tester comprises a sealed bottom cylinder, a metal hole plate, pressure testing tubes and a water supply tube, wherein the metal hole plate is positioned in the inner chamber of the sealed bottom cylinder; a metal wire mesh is arranged on the metal hole plate; a soil layer test sample to be tested is filled onto the metal wire mesh; a soil layer mold sample is filled onto the soil layer test sample; the pressure testing tubes are installed on a side wall of the sealed bottom cylinder and are communicated with the inner chamber of the sealed bottom cylinder; and the water supply tube is positioned above the sealed bottom cylinder. The tester is simple in structure, convenient to operate and rapid and accurate in acquiring data, avoids the influence to the test result because of poor testing synchronization, and is particularly applicable to testing on permeability coefficients of sand soil layers and incoherence soil layers containing a small amount of gravel.
Description
Technical field
The utility model relates to a kind of soil layer gas permeability measurement instrument, and especially a kind of constant head soil layer gas permeability measurement instrument that is suitable for sand formation and contains the incoherence soil layer of a small amount of gravel belongs to the geotechnics field.
Background technology
Coefficient of permeability K is a quantitative target that represents soil layer permeance property power, different soil K value difference is very not large, therefore when geology research field and water conservancy, Construction of Civil Engineering, to measure soil layer K value, the method of experimental determination infiltration coefficient has two kinds at present, i.e. constant head mensuration and varying head mensuration.
Existing constant head soil layer gas permeability measurement instrument needs measuring flow when measuring infiltration coefficient, and flow is the volume acquisition of being flowed out water in the certain hour by apopore by measuring.This measuring method need to be equipped with stopwatch and graduated cylinder or measuring cup, need gather the interior volume numerical value by flowing out water in the apopore of certain hour during measurement, and then this measured value is tried to achieve flow divided by Measuring Time.Because the method is had relatively high expectations to the synchronism of Measuring Time, and different measuring personnel's reaction speed is different, so measurement data has certain error, affected the accuracy of measuring structure; And the method needs repeatedly repeated measurement, complex steps, and surveying work efficient is lower.
The utility model content
The purpose of this utility model is the defective for existing constant head soil layer gas permeability measurement instrument existence, provide a kind of simple in structure, easy to operate, image data quick and precisely is particularly suitable for sandy soil and the constant head soil layer gas permeability measurement instrument that contains the incoherence soil layer of a small amount of gravel.
Problem described in the utility model realizes with following technical proposals:
A kind of constant head soil layer gas permeability measurement instrument, it comprises back cover cylinder, metal perforated plate, piezometric tube and feed pipe, described metal perforated plate is arranged in the back cover cylinder bore, at metal perforated plate wire gauze is set, filling soil layer sample to be measured on wire gauze is filled the soil layer apperance on the soil layer sample, described piezometric tube is installed on the sidewall of back cover cylinder, they are communicated with the back cover cylinder bore, and described feed pipe is positioned at back cover cylinder top.
Above-mentioned constant head soil layer gas permeability measurement instrument, described back cover cylinder side wall is provided with spillway hole and apopore, and described apopore is arranged in the bottom of back cover cylinder, and described spillway hole is arranged in the upper end of back cover cylinder.
Above-mentioned constant head soil layer gas permeability measurement instrument, described metal perforated plate is installed in by the metal perforated plate support on the bottom surface of back cover cylinder, metal perforated plate bottom surface and back cover cylinder bottom surface distance L 〉=6cm.
Above-mentioned constant head soil layer gas permeability measurement instrument, described piezometric tube is transparent material, it comprises top piezometric tube and bottom piezometric tube, described top piezometric tube and bottom piezometric tube form by horizontal tube and VERTICAL TUBE, its middle and upper part piezometric tube horizontal tube axis is concordant with soil layer sample composition surface with the soil layer apperance, bottom piezometric tube horizontal tube axis is concordant with soil layer sample bottom surface, all indicates level scale on the VERTICAL TUBE of top piezometric tube and bottom piezometric tube.
Above-mentioned constant head soil layer gas permeability measurement instrument, the zero line of described level scale is concordant with the spillway hole center line, and level scale numerical value increases progressively from the top down.
The utility model provides the water source by the feed pipe that is positioned at back cover cylinder top for test; Guarantee that by the spillway hole that is arranged in back cover cylinder upper end back cover cylinder bore soil layer apperance top water level maintains certain height; The utility model is placed on the above position apart from back cover cylinder bottom 6cm with metal perforated plate, and is provided with wire gauze on metal perforated plate, has both satisfied the filling requirement of soil layer sample, can prevent that again the soil layer particle is washed away; The utility model has been marked with level scale at the piezometric tube of transparent material, can directly read the loss of flood peak by water level in the piezometric tube, then calculates the infiltration coefficient of tested soil layer sample.In a word, the utility model is simple in structure, and is easy to operate, and image data has quick and precisely been avoided being particularly suitable for sand formation and the mensuration that contains the incoherence soil layer infiltration coefficient of a small amount of gravel because measuring the relatively poor impact that brings to measurement result of synchronism.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is cross-sectional view of the present utility model;
Fig. 2 is that the utility model metal perforated plate and copper mesh are arranged synoptic diagram.
Each list of reference numerals is among the figure: 1, feed pipe, 2, the back cover cylinder, 3, spillway hole, 4, the soil layer apperance, 5, the soil layer sample, 6, wire gauze, 7, metal perforated plate, 7-1, metal perforated plate support, 8, the bottom piezometric tube, 9, the top piezometric tube, 10, apopore.
Embodiment
Referring to Fig. 1, Fig. 2, the utility model comprises back cover cylinder 2, metal perforated plate 7, piezometric tube and feed pipe 1, described back cover cylinder 2 sidewalls are provided with spillway hole 3 and apopore 10, and described apopore 10 is arranged in the bottom of back cover cylinder 2, and described spillway hole 3 is arranged in the upper end of back cover cylinder 2; Described metal perforated plate 7 is installed on the bottom surface of back cover cylinder 2 by metal perforated plate support 7-1, metal perforated plate 7 bottom surfaces and back cover cylinder 2 bottom surface distance L 〉=6cm, at metal perforated plate 7 wire gauze 6 is set, filling soil layer sample 5 to be measured on wire gauze 6 is filled soil layer apperance 4 on soil layer sample 5; Described piezometric tube is transparent material, be installed on the sidewall of back cover cylinder 2, be communicated with back cover cylinder 2 inner chambers, it comprises top piezometric tube 9 and bottom piezometric tube 8, described top piezometric tube 9 and bottom piezometric tube 8 form by horizontal tube and VERTICAL TUBE, its middle and upper part piezometric tube horizontal tube axis is concordant with soil layer sample 5 composition surfaces with soil layer apperance 4, bottom piezometric tube horizontal tube axis is concordant with soil layer sample 5 bottom surfaces, on the VERTICAL TUBE of top piezometric tube 9 and bottom piezometric tube 8, all indicate level scale, the zero line of described level scale is concordant with spillway hole 3 center lines, and level scale numerical value increases progressively from the top down; Described feed pipe 1 is positioned at the top of back cover cylinder 2.
Referring to Fig. 1, Fig. 2, and in conjunction with specific embodiments principle of work of the present utility model is described: back cover cylinder 2 is glass cylinder in the present embodiment, wire gauze 6 is copper mesh, feed pipe 1 is positioned at the top of glass cylinder, described glass cylinder upper end open, be provided with top piezometric tube 9 and bottom piezometric tube 8 at its right side wall, be provided with spillway hole 3 and apopore 10 at its left side wall.Described spillway hole 3 is positioned at the glass cylinder upper end, guarantees that soil layer apperance top water level maintains certain height in the glass cylinder inner chamber.Described apopore 10 is positioned at the glass cylinder bottom, be placed in apart from 6cm place, glass cylinder bottom surface during described metal perforated plate 7 test, described wire gauze 6 is positioned on the metal perforated plate 7, on copper mesh 6, fill soil layer sample 5 during test, filling soil layer apperance 4 on soil layer sample 5, both satisfied the filling requirement of soil layer sample 5, can prevent again that the soil layer particle was washed away.Test procedure is: the infiltration coefficient of setting tested soil layer sample 5 is that the infiltration coefficient of k2, soil layer apperance 4 is the k1(k1 known parameters); With metal perforated plate 7, wire gauze 6, soil layer sample 5 and soil layer apperance 4 are packed in the glass cylinder 2 successively; Open feed pipe 1, behind the stable level of top piezometric tube 9 and bottom piezometric tube 8, record top piezometric level scale numerical value h1 and bottom piezometric level scale numerical value h2; According to Darcy's law,
, calculate
, bring concrete numerical value into formula after, calculate the coefficient of permeability K 2 of tested soil layer sample 5.
Claims (5)
1. constant head soil layer gas permeability measurement instrument, it is characterized in that, it comprises back cover cylinder (2), metal perforated plate (7), piezometric tube and feed pipe (1), described metal perforated plate (7) is arranged in back cover cylinder (2) inner chamber, at metal perforated plate (7) wire gauze (6) is set, filling soil layer sample to be measured (5) on wire gauze (6), on soil layer sample (5), fill soil layer apperance (4), described piezometric tube is installed on the sidewall of back cover cylinder (2), they are communicated with back cover cylinder (2) inner chamber, and described feed pipe (1) is positioned at the top of back cover cylinder (2).
2. a kind of constant head soil layer gas permeability measurement instrument according to claim 1, it is characterized in that, described back cover cylinder (2) sidewall is provided with spillway hole (3) and apopore (10), described apopore (10) is arranged in the bottom of back cover cylinder (2), and described spillway hole (3) is arranged in the upper end of back cover cylinder (2).
3. a kind of constant head soil layer gas permeability measurement instrument according to claim 2, it is characterized in that, described metal perforated plate (7) is installed on the bottom surface of back cover cylinder (2) by metal perforated plate support (7-1), metal perforated plate (7) bottom surface and back cover cylinder (2) bottom surface distance L 〉=6cm.
4. a kind of constant head soil layer gas permeability measurement instrument according to claim 3, it is characterized in that, described piezometric tube is transparent material, it comprises top piezometric tube (9) and bottom piezometric tube (8), described top piezometric tube (9) and bottom piezometric tube (8) form by horizontal tube and VERTICAL TUBE, its middle and upper part piezometric tube horizontal tube axis is concordant with soil layer sample (5) composition surface with soil layer apperance (4), bottom piezometric tube horizontal tube axis is concordant with soil layer sample (5) bottom surface, all indicates level scale on the VERTICAL TUBE of top piezometric tube (9) and bottom piezometric tube (8).
5. a kind of constant head soil layer gas permeability measurement instrument according to claim 4 is characterized in that the zero line of described level scale is concordant with spillway hole (3) center line, and level scale numerical value increases progressively from the top down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205797844U CN202869938U (en) | 2012-11-06 | 2012-11-06 | Constant head soil layer permeability coefficient tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205797844U CN202869938U (en) | 2012-11-06 | 2012-11-06 | Constant head soil layer permeability coefficient tester |
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| Publication Number | Publication Date |
|---|---|
| CN202869938U true CN202869938U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205797844U Expired - Lifetime CN202869938U (en) | 2012-11-06 | 2012-11-06 | Constant head soil layer permeability coefficient tester |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411871A (en) * | 2013-08-13 | 2013-11-27 | 上海电力学院 | Apparatus for measuring soil permeability coefficient |
| CN104819920A (en) * | 2015-03-24 | 2015-08-05 | 河南理工大学 | Varying-head permeability experiment apparatus for indoor freezing and thawing equipment |
| CN105588796A (en) * | 2015-12-17 | 2016-05-18 | 扬州大学 | Device for accurately and rapidly determining permeability coefficient of soil |
| CN106092849A (en) * | 2016-05-27 | 2016-11-09 | 北京交通大学 | A kind of sand-pebble layer earth pressure balanced shield, EPBS driving anti-gush experimental provision and method |
| CN108195742A (en) * | 2018-02-12 | 2018-06-22 | 浙江大学 | A kind of device and method for quickly measuring a variety of sand infiltration coefficients |
| CN108801881A (en) * | 2018-09-07 | 2018-11-13 | 福州大学 | The horizontal and vertical infiltration coefficient simultaneous determination device of silt, cohesive soil and its test method |
| CN108872042A (en) * | 2018-06-26 | 2018-11-23 | 福州大学 | Sand level, vertical infiltration coefficient simultaneous determination apparatus and its test method |
-
2012
- 2012-11-06 CN CN2012205797844U patent/CN202869938U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411871A (en) * | 2013-08-13 | 2013-11-27 | 上海电力学院 | Apparatus for measuring soil permeability coefficient |
| CN104819920A (en) * | 2015-03-24 | 2015-08-05 | 河南理工大学 | Varying-head permeability experiment apparatus for indoor freezing and thawing equipment |
| CN105588796A (en) * | 2015-12-17 | 2016-05-18 | 扬州大学 | Device for accurately and rapidly determining permeability coefficient of soil |
| CN105588796B (en) * | 2015-12-17 | 2018-01-23 | 扬州大学 | A kind of device of accurate quick measure soil permeability coefficient |
| CN106092849A (en) * | 2016-05-27 | 2016-11-09 | 北京交通大学 | A kind of sand-pebble layer earth pressure balanced shield, EPBS driving anti-gush experimental provision and method |
| CN106092849B (en) * | 2016-05-27 | 2019-02-05 | 北京交通大学 | A kind of sand-pebble layer earth pressure balanced shield, EPBS driving anti-gush experimental provision and method |
| CN108195742A (en) * | 2018-02-12 | 2018-06-22 | 浙江大学 | A kind of device and method for quickly measuring a variety of sand infiltration coefficients |
| WO2019153782A1 (en) * | 2018-02-12 | 2019-08-15 | 浙江大学 | Apparatus and method for quickly measuring multiple sandy soil infiltration coefficients |
| CN108872042A (en) * | 2018-06-26 | 2018-11-23 | 福州大学 | Sand level, vertical infiltration coefficient simultaneous determination apparatus and its test method |
| CN108801881A (en) * | 2018-09-07 | 2018-11-13 | 福州大学 | The horizontal and vertical infiltration coefficient simultaneous determination device of silt, cohesive soil and its test method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |