CN203229939U - Environmental pore pressure static sounding probe capable of evaluating saturated soil permeability characteristic in situ - Google Patents

Abstract

The utility model provides an environmental pore pressure static sounding probe capable of evaluating saturated soil permeability characteristic in situ. The environmental pore pressure static sounding probe comprises an air pressure chamber (1), a water sealing tank (2), a static sounding probe (3), a coupling rod (4), a filtering slot (5), a sidewall friction cylinder (6), a pore pressure filtering ring (7) and a circular cone head (8), wherein the static sounding probe (3), the coupling rod (4), the filtering slot (5), the sidewall friction cylinder (6), the pore pressure filtering ring (7) and the circular cone head (8) are sequentially connected from top to bottom; the air pressure chamber (1) is provided with an air valve (9), and the water sealing tank (2) is provided with a water valve (10); the air pressure chamber (1) and the water sealing tank (2) are connected through an air pipe (11), and the water sealing tank (2) and the filtering slot (5) are connected by a water pipe (12); and the sidewall friction cylinder (6) is provided with a clinometer (13), a temperature sensor (14) and a pore water pressure sensor (15), and the clinometer (13), the temperature sensor (14) and the pore water pressure sensor (15) are connected with an output cable. The environmental pore pressure static sounding probe disclosed by the utility model has the advantages of simple structure, excellent quality control, convenience in use, high detection speed, high measurement efficiency, precise and reliable measurement result and good repeatability; and a powerful testing tool is provided for the exploration and the practice of the civil engineering.

Description

But a kind of original position is estimated the environment hole of saturated soil penetration signature and is pressed static sounding probe

Technical field

The utility model belongs to the geotechnical engineering field tests, and particularly a kind of determinator of saturated soil penetration signature is estimated the environment hole of saturated soil penetration signature and pressed static sounding probe but be specifically related to a kind of original position.

Background technology

The static sounding technology is the history in existing more than 80 year so far, refer to utilize pressure apparatus that the sounding rod indentation test soil layer of contact probe will be arranged, the penetration resistance of throughput examining system test soil, sidewall frictional resistance etc., can determine some basic physico mechanical characteristic of soil, as the modulus of deformation of soil, the allowable bearing of soil etc.Existing extensive use static sounding has partly or entirely replaced probing and the sampling in the engineering investigation in the world.China at first succeeded in developing the electrical measurement static sounding and is applied to prospecting in nineteen sixty-five.In recent years along with the fast development of sensor technology, a lot of new static sounding technology have appearred, these technology can obtain pore water pressure, resistivity, pollutant proterties, temperature even the image of soil layer quickly and accurately, it have been widely used in the environmental geotechnical field abroad.

Along with Chinese economic development, the urban groundwater resource pollution problem is serious day by day.When pollutant descends the soil body intrusively, diffusion rapidly in the saturated soil below phreatic line, thus cause the pollution of large tracts of land body of groundwater, change the engineering properties of the underground soil body simultaneously, and then cause engineering problem.And the research of pollutant migration rule at first needs to determine the seepage flow feature of saturated soil.The seepage flow feature adopts osmotic coefficient k to describe usually in the saturated soil, adopts field trial and laboratory test to record usually.Traditional field trial as draw water, the water injection test scope of application is confined to zone more shallow more than the face of land, and the testing time is long, workload is big.The laboratory test method depends on sampling technique, is subjected to the influence of sampling disturbance and dimensional effect, and the penetration signature reliability that provides is not strong, and also need prevent secondary pollution in the process of the test to polluting soil.In addition, existing static sounding sensor and the quiet spy technology of existing single doube bridge are descended saturated soil seepage flow feature inestimably.

The utility model content

Utility model purpose: press static sounding probe but the purpose of this utility model provides a kind of environment hole of measuring efficient height, result original position evaluation accurately saturated soil penetration signature.

Technical scheme: but a kind of original position that the utility model provides is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, comprises air-pressure chamber, seal water tank and the static sounding feeler lever, coupling bar, lautertuns, sidewall friction tube, hole press filtration ring, the nose cone that connect successively from top to bottom; Described air-pressure chamber is provided with gas valve, and described seal water tank is provided with delivery valve; Described air-pressure chamber is connected by appendix with seal water tank, and described seal water tank is connected by water-supply-pipe with lautertuns; Described sidewall friction tube is provided with inclinometer, temperature pick up, pore water pressure sensor, and described inclinometer, temperature pick up, pore water pressure sensor are connected with output cable.

As preferably, the volume of described air-pressure chamber is 5-15L, is preferably 10L; The volume of described seal water tank is 5-15L, is preferably 10L.

Preferred as another kind, described coupling bar be shaped as truncated cone-shaped, its upper bottom surface diameter is 40-50mm; The bottom surface diameter is 30-40mm; Height is 80-120mm; Preferably, its upper bottom surface diameter is 43.7mm, and the bottom surface diameter is 35.7mm, and height is 100mm.

Preferred as another kind, the diameter of described lautertuns is 30-40mm, and height is 30-70mm, and the lautertuns middle part surface is provided with one group of annular groove, and the spacing between the adjacent notches is 2-8mm, and the slot opening width is 0.3-0.7mm; Preferably, its diameter is 35.7mm, and height is 50mm, and the spacing between the surperficial adjacent notches is 5mm, and the slot opening width is 0.5mm.

Preferred as another kind, the quantity of described gas valve is two, and the quantity of described delivery valve is two.

Preferred as another kind, the length of described water-supply-pipe is 40-80m, is preferably 60m.

Preferred as another kind, also comprise air gauge, described air gauge is located on the air-pressure chamber.

Beneficial effect: but the original position that the utility model provides estimate the environment hole of saturated soil penetration signature press that static sounding probe is simple in structure, quality control is good, easy to use, detection speed fast, measure efficient height, measurement result accurately and reliably, good reproducibility, this probe provides strong testing tool for the civil engineering exploration practices.

Description of drawings

But Fig. 1 is the structural representation that static sounding probe is pressed in the environment hole of the utility model original position evaluation saturated soil penetration signature.

Fig. 2 is the structural representation of lautertuns.

The infiltration capacity that Fig. 3 records for the utility model is figure as a result.

The transmission coefficient that Fig. 4 records for the utility model and existing indoor undisturbed sample infiltration test is figure as a result.

The specific embodiment

But pressing static sounding probe to make below in conjunction with accompanying drawing to the environment hole of the utility model original position evaluation saturated soil penetration signature further specifies.

But original position is estimated the environment hole of saturated soil penetration signature and is pressed static sounding probe, see Fig. 1, comprise air-pressure chamber 1, seal water tank 2 and the static sounding feeler lever 3, coupling bar 4, lautertuns 5, sidewall friction tube 6, hole press filtration ring 7, the nose cone 8 that connect successively from top to bottom; Air-pressure chamber 1 is provided with gas valve 9 and air gauge 16, and the quantity of gas valve 9 is two; Seal water tank 2 is provided with delivery valve 10, and the quantity of delivery valve 10 is two; Air-pressure chamber 1 is connected by appendix 11 with seal water tank 2, and seal water tank 2 is connected by water-supply-pipe 12 with lautertuns 5; Sidewall friction tube 6 is provided with inclinometer 13, temperature pick up 14, pore water pressure sensor 15, and inclinometer 13, temperature pick up 14, pore water pressure sensor 15 are connected with output cable.

In the utility model, the volume of air-pressure chamber 1 and seal water tank 2 is 10L, alternatively its size can be set rationally according to actual needs, and the volume of preferred air-pressure chamber 1 and seal water tank 2 all can be 5L to 15L.

In the utility model, coupling bar 4 be shaped as truncated cone-shaped, its upper bottom surface diameter is that 43.7mm, bottom surface diameter are 35.7mm, highly are 100mm; Alternatively its size can be set rationally according to actual needs, preferably its upper bottom surface diameter is 40-50mm, and the bottom surface diameter is 30-40mm, and height is 80-120mm.

In the utility model, the diameter of lautertuns 5 is 35.7mm, and height is 50mm, and lautertuns 5 middle part surfaces are provided with one group of annular groove 17, and the spacing between the surperficial adjacent notches is 5mm, and the slot opening width is 0.5mm; Alternatively its size can be set rationally according to actual needs, preferably its diameter is 30-40mm, and height is 30-70mm, and the spacing between the surperficial adjacent notches is 2-8mm, and the slot opening width is 0.3-0.7mm.

In the utility model, the length of water-supply-pipe 10 is 60m, can its size be set rationally according to actual needs alternatively, is preferably 40-80m.

During use, should pop one's head in behind the injection soil layer, arrive and stop injection when testing required test point, close delivery valve 10 after filling with water by delivery valve 10 in the seal water tank 2, open gas valve 9 and in air-pressure chamber 1, import nitrogen, flowed in the lautertuns 5 by water-supply-pipe 12 by the water body in the gas pressure seal water tank 2, and by in the soil body around the groove inflow probe on lautertuns 5 surfaces; Read the reading of air gauge 16, and by keeping constant by the air pressure in artificial or the servo microcomputer system control air-pressure chamber; The discharge of water body in the seal water tank 2 can be found the solution the probe transmission coefficient of saturated soil on every side according to the Darcy law in the record certain hour section.

The Darcy law has been described the seepage flow feature of saturated soil, and its one dimension expression formula is: Q=kAh/L.

Q is the unit interval seepage discharge in the formula, m ³K is transmission coefficient, m/s; A is the cross-section of river, m ²H is the gross head loss, m; L is percolation path, m.

If the vertical distance of seal water tank 2 bottom surfaces and phreatic line is Δ h, lautertuns 5 diameters are d, highly are l.The Mathematical Modeling that current flow out from lautertuns 5 can be handled according to sphere stream, suppose the radius of corresponding sphere be a _s, then the transmission coefficient expression formula under the spherical coordinates is:

$k=\frac{\mathrm{<figure-callout\; id="4"\; label="Q"\; filenames="HDA00003151726300022.png"\; state="\{\{state\}\}">Q</figure-callout>}}{4\mathrm{\&pi;\&Delta;h}{a}_s}$

According to continuum theory, the water yield that flows out from sphere should equate with the water yield that flows out from lautertuns 5 surfaces, therefore has following relation under the condition that flow velocity equates:

$4\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="a\; s"\; filenames="HDA00003151726300011.png"\; state="\{\{state\}\}">a</figure-callout>}}_s^{}=\mathrm{\&pi;dl}\&DoubleRightArrow;a_s=\sqrt{\mathrm{dl}/}4$

Then transmission coefficient is following calculates:

$k=\frac{\mathrm{<figure-callout\; id="8"\; label="Q"\; filenames="HDA00003151726300011.png"\; state="\{\{state\}\}">Q</figure-callout>}}{8\mathrm{\&pi;\&Delta;h}\sqrt{\mathrm{dl}}}$

The utility model is by the outflow water yield of water injection test record in the penetration process, and energy is cheap, convenient, fast, the original position seepage flow feature of the evaluation saturated soil of original position, makes the static sounding technology can serve the geotechnical engineering field more accurate, all sidedly.

Employing has been carried out field trial of the present utility model at Lianyun Harbour S226 provincial highway, and adopts thin-wall sampler boring to obtain undisturbed undisturbed sample and carry out results of permeability tests.In the process of the test, lautertuns 5 diameters are d=35.7mm, highly be l=50mm, the distance of phreatic line and seal water tank 2 is Δ h=3.8m, and the transmission coefficient that record the water yield that flows out in the unit interval from seal water tank 2, records according to the on-the-spot Inversion Calculation of the utility model and according to laboratory test as shown in Figure 3.

As can be seen from Figure 3, the transmission coefficient that the utility model records can be close with the result that indoor undisturbed sample infiltration test records, and error is positioned at an order of magnitude, meets the engineering design requirement.Yet obtain costing dearly of no disturbance sample, when adopting boring to get no disturbance sample, every meter needs 240 yuan to 480 yuan of costs approximately, and when adopting the utility model to carry out field trial approximately every meter only spend 30 yuan to 60 yuan, for the growing engineering construction of China, adopt the utility model very big reducing cost of degree undoubtedly, cause social benefit and economic benefit significantly.And the utility model can provide the transmission coefficient of soil layer original position, can reflect underground soil layer information more realistically.

Claims (7)

1. but static sounding probe is pressed in the environment hole of an original position evaluation saturated soil penetration signature, it is characterized in that: comprise air-pressure chamber (1), seal water tank (2) and the static sounding feeler lever (3), coupling bar (4), lautertuns (5), sidewall friction tube (6), hole press filtration ring (7), the nose cone (8) that connect successively from top to bottom; Described air-pressure chamber (1) is provided with gas valve (9), and described seal water tank (2) is provided with delivery valve (10); Described air-pressure chamber (1) is connected by appendix (11) with seal water tank (2), and described seal water tank (2) is connected by water-supply-pipe (12) with lautertuns (5); Described sidewall friction tube (6) is provided with inclinometer (13), temperature pick up (14), pore water pressure sensor (15), and described inclinometer (13), temperature pick up (14), pore water pressure sensor (15) are connected with output cable.

2. but a kind of original position according to claim 1 is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, and it is characterized in that: the volume of described air-pressure chamber (1) is 5-15L; The volume of described seal water tank (2) is 5-15L.

3. but a kind of original position according to claim 1 is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, it is characterized in that: described coupling bar (4) be shaped as truncated cone-shaped, its upper bottom surface diameter is that 40-50mm, bottom surface diameter are 30-40mm, highly are 80-120mm.

4. but a kind of original position according to claim 1 is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, it is characterized in that: the diameter of described lautertuns (5) is 30-40mm, the high 30-70mm of being, lautertuns (5) middle part surface is provided with one group of annular groove (17), the slot opening width is 0.3-0.7mm, and the spacing between the adjacent notches is 2-8mm.

5. but a kind of original position according to claim 1 is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, and it is characterized in that: the quantity of described gas valve (9) is two, and the quantity of described delivery valve (10) is two.

6. but a kind of original position according to claim 1 is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, and it is characterized in that: the length of described water-supply-pipe (12) is 40-80m.

7. but a kind of original position according to claim 1 is estimated the environment hole pressure static sounding probe of saturated soil penetration signature, and it is characterized in that: also comprise air gauge (16), described air gauge (16) is located on the air-pressure chamber (1).

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