CN101858075B - Environmental static sounding probe for contaminated foundation soil - Google Patents
Environmental static sounding probe for contaminated foundation soil Download PDFInfo
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- CN101858075B CN101858075B CN2010101583343A CN201010158334A CN101858075B CN 101858075 B CN101858075 B CN 101858075B CN 2010101583343 A CN2010101583343 A CN 2010101583343A CN 201010158334 A CN201010158334 A CN 201010158334A CN 101858075 B CN101858075 B CN 101858075B
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- static sounding
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Abstract
The invention discloses an environmental static sounding probe for contaminated foundation soil, which is characterized in that the periphery of the upper half section of the probe is coated with four annular electrodes, wherein the upper and lower annular electrodes are two reference electrodes (1), the middle annular electrodes are two test electrodes (2), and the annular electrodes are insulated by a plastic insulating layer (3); the lower half section of the probe is provide with a three-component seismic detector (4), a two-dimensional clinometer (5), an electrothermic regulator (6), a friction drum (7), a hole-pressure filtration ring (9) and a conical probe (10) from top to bottom; the middle of the friction drum (7) is provided with a pore water pressure sensor (8), a tip resistance pressure sensor (11) and a sidewall frictional resistance pressure sensor (12) are respectively arranged on the internal side faces of the friction drum (7), and the hole-pressure filtration ring (9) is positioned on the joint of the friction drum (7) and the conical probe (10). The probe of the invention has the advantages of in-situ, speediness, accuracy and economy, and the like, and a strong recognition tool is provided for evaluating the contaminated foundation soil in the process of environmental geotechnical engineering.
Description
Technical field
The present invention relates to a kind of environment static sounding probe that pollutes foundation soil, belong to a kind of static sounding device that can quick identification pollutes soil layer in the environmental geotechnical field.
Background technology
The static sounding technology is meant the sounding rod indentation test soil layer that utilizes pressure apparatus will have contact probe; Through the native static point resistance of measurement system test, sidewall friction resistance etc.; Can confirm some basic physico mechanical characteristic of soil, like the deformation modulus of soil, the allowable bearing of soil etc.The static sounding technology is the history in existing more than 80 year so far.The widespread 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 electric measuring type static sounding and is applied to prospecting in nineteen sixty-five.Along with the fast development of sensor technology, a lot of new static sounding technology occurred in recent years, these technology can obtain pore water pressure, seismic event, resistivity, pollutant proterties, temperature even the image of soil layer quickly and accurately.It is widely used in the environmental geotechnical field abroad.China starts to walk than later in the research of novel static sounding sensor, penetration resistance or specific penetration resistance that present domestic widely used single doube bridge static sounding only can be tested, and the sidewall friction resistance, the basic physico mechanical characteristic of confirmable soil layer is very limited.
In recent years; Along with the expansion of Chinese economic development, urban construction and the adjustment of industrial pattern; The large enterprise in a lot of centers, big city, suburb; For example chemical plant, refinery, steel plant, textile mills, metal smelt, plating and machining factory etc. have all progressively implemented to move back the city and have advanced garden, closure, suspension, merger and conversion work, like Beijing Capital Iron and Steel, chemical plant, Nanjing, chemical fibre factory, Nanjing, Nanjing chemical industry, tin-free steel ironworks etc.Reasons such as these enterprises " three wastes " draining technology imperfection and environmental practice policy, a large amount of poisonous and harmful heavy metallics, organic contaminant have got into soil and underground water, cause place, enterprise former address to become the heavily contaminated place, form to pollute (soil) ground.These industrial pollution place overwhelming majority will be utilized for redevelopment such as commercial building, residential houses, become structure foundation.The contaminated land base, owing to received the erosion of the three wastes (waste gas, waste liquid, waste residue) that produce in the industrial processes, chemical change has taken place in soil property; Changed the original proterties of soil, generally speaking, polluting ground not only can polluted underground water or form harmful gas; Directly the harm people are physically and mentally healthy; Polluter can cause the reduction of foundation strength simultaneously, reduces the stability and the permanance of engineering structure, underground works, underground installation etc., thereby influences the engineering life-span.Therefore estimating pollution characteristic and evolution thereof, the rule of development in these places, and take the corresponding engineering technology to dispose base impurely, make it reach redevelopment and utilize and durable function, is the new key subjects that China's modern city construction faces.Pollute the investigation of ground and need confirm that stratigraphic section, underground water distribute, distribution, scope and the pollution level of pollutant, wherein the distribution of pollutant is most important to the environment geotechnique.The quantitative evaluation of pollution level need obtain some soil layer and phreatic special parameter, and these are that the ground geophysical prospecting method is difficult to accurately obtain.And the static sounding technology that has particular sensor undoubtedly is a best choice.Because pollutant is electrolyte or organic normally,, therefore might distinguish and pollute the soil and the unpolluted soil body through the difference of native resistivity like the organic compound of heavy metal and carbon.Research discloses, and the resistivity height is indicating that water cut is low, it is big etc. to contain gas flow height, sand or gravel content in the hole.Every kind of great soil group all comprises intrinsic conductivity (resistivity background value), and its variation means possibly receive pollution.That is to say to have difference between the water resistance rate in the not comtaminated soil body of similar physical property to judge the essential characteristic of groundwater contamination through contaminant water resistivity in the soil body relatively with it.
Summary of the invention
Technical matters: the technical matters that the present invention will solve is the defective that exists to the quiet spy technology of domestic existing single doube bridge, proposes a kind of environment static sounding probe that is used to pollute the foundation soil quick identification.
Technical scheme: the periphery that is used to pollute the environment static sounding probe upper semisection of foundation soil of the present invention is surrounded by four ring electrodes, and two is reference electrode up and down, and middle two be test electrode, between each ring electrode, adopts the plastic insulating layer isolation; Be sequentially with 3-component earthquake detector from top to bottom at this probe lower semisection, two-dimentional tiltmeter, electroregulator, friction cylinder, hole press filtration ring, coniform probe; Centre at friction cylinder is provided with pore water pressure sensor, lays static point resistance pressure transducer and sidewall friction resistance pressure transducer on the side in friction cylinder respectively, and hole press filtration ring is positioned at the junction of friction cylinder and probe.
The cone angle of probe is 60 °.
The press filtration ring thickness 5mm in the hole is positioned at awl shoulder position, and the useful area ratio of probe is 0.8.
The arrangement pitches of reference electrode and test electrode is 50mm.
Beneficial effect: the environment static sounding probe that is used to pollute foundation soil of the present invention, its resistivity measurement part mainly is made up of four copper ring electrodes and inner institutes such as Circuits System.Keep apart with ambroin between the copper electrode, form O shape annular seal system.According to the voltage difference of two outer electrodes (reference electrode) with two internal electrodes (test electrode); Measure inner two interelectrode change in voltage synchronously, continuously through its inner Circuits System and two electrodes, and calculate the resistivity size of electrode surrounding soil according to Ohm law principle factorization.
Description of drawings
Fig. 1 is measuring principle figure of the present invention;
Wherein have: reference electrode 1, test electrode 2, plastic insulating layer 3,3-component earthquake detector 4; Two dimension tiltmeter 5, electroregulator 6, friction cylinder 7, pore water pressure sensor 8; Hole press filtration ring 9, coniform probe 10, static point resistance pressure transducer 11, sidewall friction resistance pressure transducer 12.
Embodiment
The periphery that is used to pollute the environment static sounding probe upper semisection of foundation soil of the present invention is surrounded by two annular reference electrodes 1 and two ring-type test electrodes 2, is plastic insulating layer 3 in the both sides of ring electrode; Be provided with 3-component earthquake detector 4 at this probe lower semisection; Be provided with two-dimentional tiltmeter 5 in the bottom of 3-component earthquake detector 4; Be provided with electroregulator 6 in the bottom of two-dimentional tiltmeter 5, friction cylinder 7 is positioned at the below of electroregulator 6, is provided with pore water pressure sensor 8 at the middle part of friction cylinder 7; Below friction cylinder 7, be connected with coniform probe 10, hole press filtration ring 9 is positioned at the junction of friction cylinder 7 and probe 10.On the friction cylinder inner side, lay static point resistance pressure transducer 11 and sidewall friction resistance pressure transducer 12 respectively.The cone angle of probe 10 is 60 °, diameter 35.7mm, and the awl basal cross section is long-pending to be 10cm
2
The function (can survey end resistance, frictional resistance, inclination and hole presses) and the native resistivity measurement function of conventional hole pressure static sounding that this probe is integrated, inside is equipped with 3-component earthquake detector, can record the shear wave velocity of soil layer.In this probe set inside electroregulator is arranged, can carry out the test of the rectification building-out and the soil temperature of temperature.The resistivity of soil is the basic parameter that characterizes soil body electric conductivity, is one of intrinsic physical parameter of soil, depends on native porosity, pore shape, hole liquid resistivity, saturation degree, solid particle composition, shape, directionality, cementing status etc.The Changing Pattern of the physical mechanical property index of the Changing Pattern reflection soil body of soil resistivity and index of correlation thereof.Therefore, can be used for polluting the assessment of foundation soil based on the resistivity static sounding technology.The core of polluting foundation soil static sounding probe equipment is a resistivity sensor, and probe adopts four configuration of electrodes, to eliminate the gas generation and to electroplate the error that possibly cause.Probe has a special electric servo system, uses automatic correction technique to guarantee the measuring accuracy in 0～10000ms/s scope.The probe specification meets international standard: 60 ° of cone angles, cone diameter are 35.7mm, and the awl basal cross section is long-pending to be 10cm
2, sidewall friction tube area 150cm
2
Static point resistance pressure transducer range is 100kN; Precision is 0.2%.
Side friction pressure transducer range is 20kN; Precision is 0.2%.
The pore water pressure sensor range is 3.5MPa; Precision is 0.5%.
The resistivity measurement frequency is 1000HZ, and calibration range is 1-10000 ohm-m, electrode spread: annular arrangement, electrode separation are 50mm.
3-component earthquake detector 4: model is m317259, and natural frequency is 100HZ/60HZ, and sensitivity is 104mV/kine, and impedance is 215 Ω.
Two dimension tiltmeter 5: the drift angle measurement range is 0 °～15 °; Precision is ± 0.1 °; Drift angle resolution is 0.01 °.
Be illustrated in figure 1 as the schematic diagram of measurement.Because the complicacy of electric field in the soil around the static sounding feeler lever, and boundary condition is restive, makes by the measured native electrical characteristic of probe very complicated.Drawn the theoretical equation of cone penetration test through Ohm law, native resistivity is through two interelectrode voltage drop Δ V under the test steady current, and calculate to be unearthed according to Ohm law that the size of resistance R draws.The vertical electricalresistivity of sample can be expressed as:
In the formula, S is electrode area (m
2), L is electrode separation (m), I is strength of current (A).
Because the complicacy of boundary condition has drawn the theoretical equation of cone penetration test through Ohm law:
ρ＝π
2ΔV/(CI)
In the formula, C=1/ (d+r
M)-1/ (d+r-r
M)-1/ (d+r
N)+1/ (d+r-r
N), ρ is the resistivity of soil, and Δ V is a voltage difference, and I is an electric current.
Claims (2)
1. environment static sounding probe that is used to pollute foundation soil; It is characterized in that being surrounded by four ring electrodes in the periphery of this probe upper semisection; Two is reference electrode (1) up and down, and middle two is test electrode (2), between each ring electrode, adopts plastic insulating layer (3) to isolate; Be sequentially with 3-component earthquake detector (4) from top to bottom at this probe lower semisection, two-dimentional tiltmeter (5), electroregulator (6), friction cylinder (7), hole press filtration ring (9), coniform probe (10); Be provided with pore water pressure sensor (8) in the centre of friction cylinder (7); Lay static point resistance pressure transducer (11) and sidewall friction resistance pressure transducer (12) on the side in friction cylinder (7) respectively, hole press filtration ring (9) is positioned at the junction of friction cylinder (7) and probe (10);
The cone angle of probe (10) is 60 °; Hole press filtration ring (9) thickness 5mm is positioned at awl shoulder position, and the useful area ratio of probe is 0.8.
2. the environment static sounding probe that is used to pollute foundation soil according to claim 1, its characteristic is 50mm at the arrangement pitches of reference electrode (1) and test electrode (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101583343A CN101858075B (en) | 2010-04-27 | 2010-04-27 | Environmental static sounding probe for contaminated foundation soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101583343A CN101858075B (en) | 2010-04-27 | 2010-04-27 | Environmental static sounding probe for contaminated foundation soil |
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| CN101858075A CN101858075A (en) | 2010-10-13 |
| CN101858075B true CN101858075B (en) | 2012-01-18 |
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| CN2010101583343A Expired - Fee Related CN101858075B (en) | 2010-04-27 | 2010-04-27 | Environmental static sounding probe for contaminated foundation soil |
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Cited By (2)
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| CN104018484A (en) * | 2014-06-24 | 2014-09-03 | 东南大学 | Automatic back-tightening type probe rod slip stopper for piezocone penetration test |
| CN104164860A (en) * | 2014-08-12 | 2014-11-26 | 东南大学 | Gravity type pore pressure dynamic sounding device for seabed shallow soil |
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| CN102352620A (en) * | 2011-09-10 | 2012-02-15 | 无锡市政设计研究院有限公司 | Method and device for measuring and monitoring groundwater pressure |
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| KR101003755B1 (en) * | 2007-06-19 | 2010-12-23 | 재단법인서울대학교산학협력재단 | Method for analysis of pollutant transport in soil |
| CN101487811B (en) * | 2009-02-13 | 2012-05-23 | 东南大学 | Static sounding resistivity probe |
| CN201635066U (en) * | 2010-04-27 | 2010-11-17 | 东南大学 | Environmental static force sounding probe for pollution foundation soil |
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2010
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018484A (en) * | 2014-06-24 | 2014-09-03 | 东南大学 | Automatic back-tightening type probe rod slip stopper for piezocone penetration test |
| WO2015196836A1 (en) * | 2014-06-24 | 2015-12-30 | 东南大学 | Automatic back-tightening type probe rod slip stopper for piezocone penetration test |
| CN104164860A (en) * | 2014-08-12 | 2014-11-26 | 东南大学 | Gravity type pore pressure dynamic sounding device for seabed shallow soil |
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| CN101858075A (en) | 2010-10-13 |
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