CN111562195B - A method and device for rapid in-situ determination of dry density of fine-grained soil - Google Patents
A method and device for rapid in-situ determination of dry density of fine-grained soil Download PDFInfo
- Publication number
- CN111562195B CN111562195B CN202010372795.4A CN202010372795A CN111562195B CN 111562195 B CN111562195 B CN 111562195B CN 202010372795 A CN202010372795 A CN 202010372795A CN 111562195 B CN111562195 B CN 111562195B
- Authority
- CN
- China
- Prior art keywords
- electrode
- rod
- tdr
- dry density
- soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a device for in-situ rapid determination of dry density of fine soil, which comprises a cylinder wall and an inverted T-shaped connecting rod, wherein the inverted T-shaped connecting rod comprises a connecting cross rod and a connecting vertical rod, a circular ring is arranged in the middle of the connecting vertical rod, the circular ring is sleeved on a fixed pin rod, and two ends of the fixed pin rod are welded on the cylinder wall; the upper end of the first steel rod is hinged with the first steel member, the first steel member is welded with the cylinder wall, the C1 end of the connecting cross rod is respectively hinged with the lower end of the first steel rod and the upper end of the second steel rod, the lower end of the second steel rod is hinged with the first insulating sliding block, the first steel rod is a telescopic rod, the invention also discloses a method for rapidly measuring the dry density of fine soil in situ, which can rapidly obtain the dry density on site and save a large amount of testing time; the sliding block structure is adopted, the operation is simple, and the logic is clear.
Description
Technical Field
The invention belongs to the field of geotechnical engineering related to foundation treatment by various compaction piles, and particularly relates to a device for in-situ rapid determination of dry density of fine soil, and a method for in-situ rapid determination of dry density of fine soil.
Background
The compaction pile method is generally used for treating and reinforcing the foundation above the ground water level, and is a very effective method, and has been widely used in the aspect of treating the foundation at home and abroad in the last 20 years.
After compaction of the fill holes is completed by the compaction pile method, dry density measurements are typically performed to verify the compaction effect of the soil between piles. The dry density is required to be measured firstly, the water content and the density of the center point of the compaction filling hole are usually excavated to a designated depth from the ground surface manually or mechanically by the most common measuring method at present, then the cutting ring coated with vaseline is pressed into the soil manually, then the cutting ring is separated from the soil column by a wire saw or a soil cutter, the residual soil on two sides is cut off, then the balance is used for weighing, the density is calculated, then the water content is obtained by a drying method or an alcohol combustion method, and the dry density is calculated after the density and the water content are obtained. The method for obtaining the dry density requires repeated steps of manual or mechanical excavation, manual pressing into a cutting ring and the like in the filling depth range of the compaction pile, so that the efficiency of obtaining the index is relatively low. Therefore, a fast and efficient method for obtaining dry density is needed to save manpower and material resources.
At present, a method also exists for measuring the stable compaction force of the pile periphery and the compaction force of the pile bottom through a soil pressure box, and optimizing the compaction effect through the relation among the compaction force, the compaction coefficient of soil and the compaction energy. However, this method requires the installation of a soil pressure box into the borehole, which requires more machinery and labor, and also has problems of loss and recovery of the soil pressure box.
In summary, prior to the present invention, there are several disadvantages as follows. ① The method comprises the steps of performing manual cutting ring soil taking operation, coating vaseline on the inner wall of a cutting ring, driving the cutting ring into a soil layer to be measured by using a soil sampler drop hammer, removing a compaction hammer and a directional cylinder, digging out a cutting ring sample by using an artificial pick, cutting off residual soil at two ends of the cutting ring by using a soil trimming cutter, wiping the wall of the cutting ring, and weighing the cutting ring and soil; ② After the weight measurement of the cutting ring and the soil is completed, the cutting ring soil is required to be taken out, the water content is measured by a drying method or an alcohol combustion method, if the water content is measured by the drying method, the water content is required to be obtained by about 24 hours, if the water content is measured on site by the alcohol combustion method, the site combustion is generally required to be carried out for 3 times, the accuracy of measuring the water content of the soil by the alcohol combustion method is closely related to the soil class, when the soil is used for heavy sub-clay and clay, the measured results are very different in the drying method, and when the soil contains organic matters, the organic matters in the soil are burnt by the alcohol combustion, so that the accuracy of the result is poor;
In order to overcome the main defects and shortcomings of the prior dry density measurement, it is necessary to design a method and a device for efficiently and accurately measuring the dry density, which can effectively reduce or eliminate the manual cutting procedure, reduce the test time;
Disclosure of Invention
The invention aims to provide a method for in-situ rapid determination of the dry density of fine-grained soil, which aims at the defects existing in the prior art, is simple and feasible, does not need to excavate soil body, does not need to manually perform a cutting ring method operation, is convenient to operate in the whole process, can continuously operate, can effectively reduce test time and improve test speed, is suitable for measurement of the dry density of the compaction pile constructed on various fine-grained soil fields such as loess, soft soil, red clay and silt, and can be used for calculation of compactness, compaction coefficient and minimum compaction coefficient.
The invention further aims at providing a device for rapidly measuring the dry density of fine soil in situ, which has the advantages of simple structure, simplicity and convenience in operation, durability of assembled components, strong practicality, flexibility and adaptability and wide application prospect.
The above object of the present invention is achieved by the following technical means:
the device for in-situ rapid determination of the dry density of the fine soil comprises a cylinder wall and also comprises an inverted T-shaped connecting rod,
The inverted T-shaped connecting rod comprises a connecting cross rod and a connecting vertical rod,
A circular ring is arranged in the middle of the connecting vertical rod, the circular ring is sleeved on the fixed pin rod, and two ends of the fixed pin rod are welded on the cylinder wall;
the upper end of the first steel rod is hinged with the first steel member, the first steel member is welded with the cylinder wall, the C1 end of the connecting cross rod is respectively hinged with the lower end of the first steel rod and the upper end of the second steel rod, the lower end of the second steel rod is hinged with the first insulating sliding block, the first steel rod is a telescopic rod,
The first insulating slide block is connected with the first slide rail in an adapting way, the top end of the first electrode, the top end of the second electrode and the top end of the third electrode are arranged in the first insulating slide block, epoxy resin is filled between the first electrode, the second electrode and the third electrode and the first insulating slide block, the first slide rail is connected with the cylinder wall through the second steel member,
The upper end of the third steel rod is hinged with a third steel member, the third steel member is welded with the cylinder wall, and the C2 end of the connecting cross rod is hinged with the lower end of the third steel rod and the upper end of the fourth steel rod; the lower end of the fourth steel rod is hinged with a second insulating sliding block of the second sliding block part, and the third steel rod is a telescopic rod;
the top of first probe and second probe sets up in the insulating slider of second, and pressure sensor is located the insulating slider of second, and it has epoxy to fill between the top of first probe, second probe and the insulating slider of second, and the top of first probe is connected with pressure sensor, and the insulating slider of second is connected with second slide rail adaptation, and the second slide rail passes through the fourth steel component and is connected with the section of thick bamboo wall.
The top end of the first electrode is connected with the signal exciter through the signal excitation cable, the top end of the second electrode is connected with the first signal collector through the signal acquisition cable, the top end of the third electrode is connected with the analog-to-digital converter through the analog-to-digital conversion cable, and the analog-to-digital converter is connected with the first signal collector;
The upper end of the first probe rod TB-1 is connected with the positive electrode of the resistivity measurer through a first resistivity measuring cable, and the pressure sensor is connected with the second signal collector through a pressure sensor cable; the top of the second probe is connected with the negative electrode of the resistivity measurer through a second resistivity measuring cable.
The upper end of the connecting vertical rod is connected with one end of the spring, and the other end of the spring is fixed on the cylinder wall; the upper end of the connecting vertical rod is also connected with one end of a buckle inserting rod, the other end of the buckle inserting rod is provided with a buckle, and the buckle is inserted into an opening on the cylinder wall; the opening is opposite to the part of the cylinder wall connected with the spring.
A method for in situ rapid determination of dry density of fine soil, comprising the steps of:
step 1, preparing soil samples with different dry densities and different initial water contents,
Establishing a functional relation between the resistivity and the dry density corresponding to different water contents at different temperatures; establishing a functional relation between the penetration resistance value and the dry density under the condition of different water contents;
step2, obtaining a maximum dry density value of a soil body of a field to be tested through a compaction test;
Step 3, finishing the surface of the soil body of the field to be tested;
Step 4, placing a device for in-situ rapid determination of the dry density of fine soil on the surface of the soil body of the field to be detected, so that the bottom ends of the first electrode, the second electrode, the third electrode, the first probe and the second probe are in contact with the surface of the soil body of the field to be detected;
Step 5, pushing the top end of the connecting vertical rod to drive the first insulating sliding block to move downwards, lifting the second insulating sliding block, enabling the first electrode, the second electrode and the third electrode to enter soil bodies of a field to be detected, enabling the signal exciter to send excitation signals to the first electrode, enabling the second electrode to receive signals and transmitting electric signals to the first signal collector through a cable to collect water content, enabling temperature analog signals of the third electrode to be converted into digital signals through an analog-to-digital converter, and enabling the digital signals to be transmitted to the first signal collector through the cable to obtain temperature;
Step 6, pushing the top end of the connecting vertical rod to drive the first insulating sliding block to lift upwards, pressing the second insulating sliding block downwards, and pulling out the first electrode, the second electrode and the third electrode; the first probe and the second probe enter soil body of a field to be detected; the pressure sensor obtains penetration resistance electric signals and transmits the penetration resistance electric signals to the second signal collector through the coaxial cable, and the penetration resistance electric signals are compared with a sensor calibration curve to obtain corresponding penetration resistance values; after the penetration resistance electric signal acquisition is completed, closing the second signal acquisition device, opening the resistivity measurer, generating a current signal between the first probe and the second probe, transmitting the current signal to the resistivity measurer, and obtaining the resistivity of the soil body of the field to be detected through ohm law and resistivity definition;
Step 7, returning the connecting vertical rod to a vertical state, so that the first probe and the second probe are pulled out of the soil body of the field to be detected;
Step 8, searching a corresponding functional relation between the resistivity and the dry density according to the obtained water content and temperature of the soil body of the field to be detected, and further obtaining a first dry density of the soil body of the field to be detected according to the obtained resistivity of the soil body of the field to be detected;
Searching a corresponding functional relation between the penetration resistance value and the dry density according to the obtained water content of the soil body of the field to be detected, further obtaining a second dry density of the soil body of the field to be detected according to the obtained penetration resistance value,
Averaging the first dry density and the second dry density to obtain the dry density of the soil body of the field to be detected,
And 9, comparing the obtained maximum dry density of the soil body of the field to be detected with the obtained maximum dry density of the soil body of the field to be detected, and obtaining the compaction degree or the compaction coefficient of the soil body of the field to be detected.
In the step 1, the functional relation between the resistivity and the dry density corresponding to different water contents at different temperatures is established, and comprises the following steps of
Step 1.1a, placing soil samples with different wet densities into an incubator, setting a constant temperature value in the incubator, and standing for more than 60 minutes;
step 1.2a, taking out a soil sample, rapidly measuring the resistivity, and recording the resistivity value;
Step 1.3a, drying the soil sample with the resistivity measured, measuring the actual water content, and calculating the dry density according to the water content and the wet density;
step 1.4a, drawing a relation curve of resistivity value and dry density, and fitting to obtain a functional relation of the resistivity and the dry density at the current temperature and the current water content;
step 1.5a, changing an initial water content value, and repeating the steps 1.1a-1.4a to obtain the functional relation between the resistivity and the dry density under the same temperature and different water contents;
and step 1.6a, changing the temperature value of the incubator, and repeating the steps 1.1a-1.5a to obtain the functional relation between the resistivity and the dry density corresponding to different water contents at different temperatures.
In the step 1, under the condition of establishing different water contents, the functional relation between the penetration resistance value and the dry density comprises the following steps:
Step 1.1b, preparing soil samples with set dry densities and different water contents;
step 1.2b, performing soil sample injection by adopting a micro injection instrument to obtain an injection resistance value, and continuously injecting to obtain a relation curve of the injection resistance value and dry density under the condition of different water contents;
step 1.3b, under the condition of obtaining the current water content, penetrating the maximum value of resistance and the corresponding dry density;
Step 1.4b, changing the dry density, and repeating the steps 1.1b-1.3b to obtain the functional relation between the penetration resistance value and the dry density under the condition of establishing different water contents.
Compared with the prior art, the invention has the following beneficial effects:
1. the dry density can be quickly obtained on site, so that a large amount of test time is saved;
2. the sliding block structure is adopted, the operation is simple, and the logic is clear.
Drawings
FIG. 1 is a schematic structural view of an apparatus for in situ rapid determination of dry density of fine soil;
FIG. 2 is a schematic cross-sectional view of a first insulating slider;
FIG. 3 is a schematic cross-sectional view of a first rail;
FIG. 4 is an internal schematic view of a second slider portion;
fig. 5 is a schematic structural view of the eye-splice bar.
Detailed Description
The present invention will be further described in detail below in conjunction with the following examples, for the purpose of facilitating understanding and practicing the present invention by those of ordinary skill in the art, it being understood that the examples described herein are for the purpose of illustration and explanation only and are not intended to limit the invention.
Example 1:
A device for rapidly measuring the dry density of fine soil in situ comprises an inverted T-shaped connecting rod C, a first sliding block mechanism A and a second sliding block mechanism B;
the inverted T-shaped connecting rod C comprises a connecting cross rod C7 and a connecting vertical rod C8, one end (C1 end) of the connecting cross rod C7 is respectively hinged with the lower end of the first steel rod A1 and the upper end of the second steel rod A2, and the other end (C2 end) of the connecting cross rod C7 is respectively hinged with the lower end of the third steel rod B1 and the upper end of the fourth steel rod B2;
a circular ring C3 is arranged in the middle of the connecting vertical rod C8, the circular ring C3 is sleeved on a fixed pin rod C4, and two ends of the fixed pin rod C4 are welded on the cylinder wall 1;
The upper end of the connecting vertical rod C8 is connected with one end of a spring C5, and the other end of the spring C5 is fixed on the cylinder wall 1; the upper end of the connecting vertical rod C8 is also connected with one end of a buckle inserting rod C6, the other end of the buckle inserting rod C6 comprises a buckle inserting C6-1, and the buckle inserting C6-1 is inserted into an opening C6-2 on the cylinder wall 1 and fixed on the cylinder wall 1; the opening C6-2 is opposite to the portion of the cylinder wall 1 to which the spring C5 is connected.
The first slider mechanism a includes a first steel rod A1, a second steel rod A2, a first steel member A3, and a first slider portion A4. The upper end of the first steel rod A1 is hinged with the first steel member A3, the first steel member A3 is welded with the cylinder wall 1, one end (C1 end) of the connecting cross rod C7 is respectively hinged with the lower end of the first steel rod A1 and the upper end of the second steel rod A2, the lower end of the second steel rod A2 is hinged with the first insulating sliding block A4-2 in the TDR integrated sliding block A4, and the first steel rod A1 is a telescopic rod.
The first slider part A4 comprises a first sliding rail A4-1, a first insulating slider A4-2, a second steel member A4-3, a first electrode TDR-1, a second electrode TDR-2 and a third electrode TDR-3, wherein the first insulating slider A4-2 is connected with the first sliding rail A4-1 in an adapting way, the top end of the first electrode TDR-1, the top end of the second electrode TDR-2 and the top end of the third electrode TDR-3 are arranged in the first insulating slider A4-2, epoxy resin A4-2a is filled between the first electrode TDR-1, the second electrode TDR-2 and the third electrode TDR-3 and the first insulating slider A4-2, the top end of the first electrode TDR-1 is connected with a signal exciter A6 through a signal acquisition cable, the top end of the second electrode TDR-2 is connected with a first signal acquisition device A7 through a signal acquisition cable, the top end of the third electrode TDR-3 is connected with an analog-digital converter A8 through an analog-digital conversion cable, and the first electrode TDR-3 is connected with the first steel member A4-1 through a signal acquisition cable and the first steel member A4-2.
The signal exciter A6 can send out an electric signal to the first electrode TDR-1 for detection, and the first signal collector A7 receives and collects the signal through the second electrode TDR-2; the third electrode TDR-3 is a temperature probe, and the acquired temperature signal is acquired by the analog-to-digital converter A8 and sent to the first signal acquisition device A7.
From the view point provided by fig. 2, the left side and the right side of the first insulating sliding block A4-2 are welded with sliding block pieces A4-2b, two opposite sides of each sliding block piece A4-2b are respectively provided with a sliding block vertical groove A4-2C, the cross section of each sliding block vertical groove A4-2C is an arc, the inner diameter of each sliding block vertical groove is identical to the diameter of each steel ball A4-1a, the first sliding rail A4-1 is provided with a sliding rail vertical groove A4-1b corresponding to the position of each sliding block vertical groove A4-2C, the cross section of each sliding rail vertical groove A4-1b is an arc, the inner diameter of each sliding rail vertical groove A4-1b is identical to the diameter of each steel ball A4-1a, and each steel ball A4-1a is clamped between the position of each vertical sliding groove A4-2C and the corresponding sliding rail vertical groove A4-1 b. So that the first insulating slider A4-2 can slide up and down along the first slide rail A4-1.
The top end of the first electrode TDR-1, the top end of the second electrode TDR-2 and the top end of the second electrode TDR-3 are filled with high-density epoxy resin A4-2a between the insulating sliding block A4-2, so that moisture is prevented from entering the integrated body, and tightness is improved.
The second slider mechanism B includes a third steel rod B1, a fourth steel rod B2, a third steel member B3, a fourth steel member, and a second slider portion B4-2. The upper end of the third steel rod B1 is hinged with the third steel member B3, the third steel member B3 is welded with the cylinder wall 1, and the other end (C2 end) of the connecting cross rod C7 is hinged with the lower end of the third steel rod B1 and the upper end of the fourth steel rod B2; the lower end of the fourth steel rod B2 is hinged with a second insulating sliding block of the second sliding block part B4-2, and the third steel rod B1 is a telescopic rod;
The second slider part B4-2 comprises a second sliding rail, a second insulating slider, a first probe TB-1, a second probe TB-2 and a pressure sensor B4-3; the top ends of the first probe TB-1 and the second probe TB-2 are arranged in the second insulating sliding block, the pressure sensor B4-3 is positioned in the second insulating sliding block, epoxy resin is filled between the top parts of the first probe TB-1 and the second probe TB-2 and the second insulating sliding block,
The first probe TB-1 and the second probe TB-2 both comprise a probe rod and a conical head arranged at the lower end of the probe rod, and the maximum diameter of the conical head is larger than the diameter of the probe rod; the upper end of the probe rod is connected with the pressure sensor B4-3 by adopting threads, the upper end of the first probe TB-1 is connected with the positive electrode of the resistivity measurer A10 by a first resistivity measuring cable, and the pressure sensor B4-3 is connected with the second signal collector A9 by a pressure sensor cable; the top of the second probe TB-2 is connected to the negative electrode of the resistivity measurer a10 through a second resistivity measuring cable.
The mode of the adaptive connection between the second insulating sliding block and the second sliding rail is the same as the mode of the adaptive connection between the first insulating sliding block and the first sliding rail. The second sliding rail is connected with the cylinder wall 1 through a fourth steel member
The adaptation connected mode can be similar referring to fig. 2 between second insulating slider and the second slide rail, the left and right sides of second insulating slider all welds the slider spare, and the both sides of every slider spare are provided with the slider and erect the groove, and the cross section of slider erects the groove is the circular arc, and the internal diameter of slider erects the groove is the same with the diameter of steel ball, is provided with on the second slide rail with the slider erects the groove relative slide rail that the groove position is relative, and the cross section of slide rail erects the groove is the circular arc, and the internal diameter of slide rail erects the groove is the same with the diameter of steel ball, and the card is equipped with the steel ball between vertical spout position and the corresponding slide rail erects the groove. So that the second insulating slider can slide up and down along the second sliding rail.
A method for in-situ rapid determination of the dry density of fine soil comprises the following steps:
Step 1, taking soil samples of a field to be detected, preparing soil samples (triaxial samples, such as cylinders with the diameter of 39.1mm and the height of 80 mm) with different dry densities and different initial water contents in a laboratory,
Establishing a functional relation between the resistivity and the dry density corresponding to different water contents at different temperatures; under the condition of different water contents, establishing a functional relation between the penetration resistance value and the dry density:
Step 1.1a, placing soil samples with different wet densities into an incubator, setting a constant temperature value in the incubator, and standing for more than 60 minutes;
step 1.2a, taking out a soil sample, rapidly measuring the resistivity, and recording the resistivity value;
step 1.3a, drying the soil sample with the resistivity measured (the temperature of an oven is 105 ℃), measuring the actual water content, and calculating the dry density according to the water content and the wet density;
step 1.4a, drawing a relation curve of resistivity value and dry density, and fitting to obtain a functional relation of the resistivity and the dry density at the current temperature and the current water content;
step 1.5a, changing an initial water content value, and repeating the steps 1.1a-1.4a to obtain the functional relation between the resistivity and the dry density under the same temperature and different water contents;
step 1.6a, changing the temperature value of the incubator, and repeating the steps 1.1a-1.5a to obtain the functional relation between the resistivity and the dry density corresponding to different water contents at different temperatures;
in addition, a dry density and penetration resistance value database is established, and the establishment steps are as follows:
Step 1.1b, preparing soil samples (ring samples, such as cylinders with the diameter of 61.8mm and the height of 40 mm) with set dry density and different water contents in a laboratory;
step 1.2b, performing penetration of a dry density soil sample by adopting a micro-penetration instrument to obtain a penetration resistance value, and continuously performing penetration to obtain a relation curve of the penetration resistance value and the dry density under the condition of different water contents;
step 1.3b, under the condition of obtaining the current water content, penetrating the maximum value of resistance and the corresponding dry density;
Step 1.4b, changing the dry density, and repeating the steps 1.1b-1.3b to obtain the functional relation between the penetration resistance value and the dry density under the condition of establishing different water contents.
Step2, obtaining a maximum dry density value of a soil body of a field to be tested through a compaction test in a laboratory;
Step3, finishing the surface of the soil body of the field to be tested, removing floating soil, plant root systems and the like;
Step 4, placing a device for in-situ rapid determination of the dry density of fine soil on the surface of the soil body of the field to be detected, so that the bottom ends of the first electrode TDR-1, the second electrode TDR-2, the third electrode TDR-3, the first probe TB-1 and the second probe TB-2 are in contact with the surface of the soil body of the field to be detected;
And 5, pressing down a buckle C6-1, wherein the buckle C6-1 is separated from the cylinder wall 1, the top end of a connecting vertical rod C8 of an inverted T-shaped connecting rod C moves towards the side of the spring under the action of the spring C5, the C1 end and the C2 end of a connecting cross rod C7 are driven to move towards the side far away from the spring C5, so that the lower end of a first steel rod A1, the upper end of a second steel rod A2, the lower end of a third steel rod B1 and the upper end of a fourth steel rod B2 are pushed to move towards the side far away from the spring C5 (leftwards in FIG. 1), and as the first steel rod A1 and the third steel rod B1 are telescopic rods, the bottom end of the connecting vertical rod C8 deflects leftwards, so that a first insulating sliding block A4-2 is driven to move downwards, a second insulating sliding block is lifted, a first electrode TDR-1, a second electrode TDR-2 and a third electrode TDR-3 are driven to enter soil bodies to be detected, a signal exciter A6 sends excitation signals to the first electrode TDR-1, the second electrode R-2 receives electric signals and transmits the electric signals to a first signal TDR-2 to a second signal through a cable and a first signal collector A7, and a second signal collector A-7 and a second signal A-7 through a digital signal collector A-7 and a digital signal A-analog signal collector A7 are transmitted to a third signal collector A7 through the cable A7. The computer analyzes and calculates the data to obtain the water content and the temperature of the soil body of the field to be detected;
Step 6, pushing the top end of a connecting vertical rod C8 of an inverted T-shaped connecting rod C to move away from the spring side, wherein the inverted T-shaped connecting rod C drives the ends C1 and C2 of a connecting cross rod C7 to move towards the spring side, and as the first steel rod A1 and the third steel rod B1 are telescopic rods, the bottom end of the connecting vertical rod C8 deflects rightwards, so that a first insulating slide block A4-2 is driven to lift upwards, a second insulating slide block is pressed downwards, and a first electrode TDR-1, a second electrode TDR-2 and a third electrode TDR-3 are pulled out of soil bodies of a field to be detected; the first probe TB-1 and the second probe TB-2 enter soil bodies of a field to be detected; the pressure sensor obtains penetration resistance electric signals and transmits the penetration resistance electric signals to the second signal collector A9 through a coaxial cable, and the penetration resistance electric signals are compared with a sensor calibration curve to obtain corresponding penetration resistance values; after the penetration resistance electric signal acquisition is completed, closing the second signal acquisition device A9, opening the resistivity measurer A10, generating a current signal between the first probe TB-1 and the second probe TB-2, transmitting the current signal to the resistivity measurer A10, and obtaining the resistivity of the soil body of the field to be measured through ohm law and resistivity definition;
Step 7, after the test is completed, the connecting vertical rod C8 of the inverted T-shaped connecting rod C returns to the vertical state under the action of a spring, so that the first probe TB-1 and the second probe TB-2 are pulled out of the soil body of the field to be tested and return to the initial state;
Step 8, searching a corresponding functional relation between the resistivity and the dry density according to the obtained water content and temperature of the soil body of the field to be detected, and further obtaining a first dry density of the soil body of the field to be detected according to the obtained resistivity of the soil body of the field to be detected;
and searching a corresponding functional relation between the penetration resistance value and the dry density according to the obtained water content of the soil body of the field to be detected, and further obtaining a second dry density of the soil body of the field to be detected according to the obtained penetration resistance value.
And averaging the first dry density and the second dry density to obtain the dry density of the soil body of the field to be detected.
Step 9, comparing the obtained maximum dry density of the soil body of the field to be tested with that obtained in a laboratory, and obtaining the compaction degree or compaction coefficient of the soil body of the field to be tested;
Step 10, repeating the steps 2-9 to obtain a plurality of dry densities;
the working principle of the invention is as follows:
The method for rapidly measuring the dry density comprises the following steps of firstly obtaining the dielectric constant of the soil body of the field to be measured by utilizing the difference of the propagation speed of electromagnetic waves in different media, then calculating the volume moisture content by utilizing the relation between the dielectric constant and the volume moisture content, recording the temperature of soil layers, measuring the resistivity between the soil bodies of the field to be measured, comparing the measured temperature with a soil body resistivity database with different densities and moisture contents, obtaining the density value of the soil body of the field to be measured, finally calculating the dry density of the soil body of the field to be measured according to the density value and the moisture content, and obtaining the compaction degree or the compaction coefficient of the soil body of the field to be measured by the obtained ratio compared with the maximum dry density of the soil body obtained in a laboratory after the dry density of the soil body of the field to be measured is obtained.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372795.4A CN111562195B (en) | 2020-05-06 | 2020-05-06 | A method and device for rapid in-situ determination of dry density of fine-grained soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372795.4A CN111562195B (en) | 2020-05-06 | 2020-05-06 | A method and device for rapid in-situ determination of dry density of fine-grained soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111562195A CN111562195A (en) | 2020-08-21 |
| CN111562195B true CN111562195B (en) | 2024-08-09 |
Family
ID=72070836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010372795.4A Active CN111562195B (en) | 2020-05-06 | 2020-05-06 | A method and device for rapid in-situ determination of dry density of fine-grained soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111562195B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324487B (en) * | 2022-03-16 | 2022-05-27 | 水利部交通运输部国家能源局南京水利科学研究院 | Direct current method-based foundation compaction in-situ detection device and method |
| CN114960591A (en) * | 2022-06-07 | 2022-08-30 | 中交一公局集团有限公司 | Method for rapidly detecting compacted density of filled soil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212206982U (en) * | 2020-05-06 | 2020-12-22 | 湖北省路桥集团有限公司 | Crank slider device for circularly measuring temperature, humidity and penetration resistance of soil body |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1110698A (en) * | 1977-09-09 | 1981-10-13 | Kandiah Arulanandan | Method and apparatus for measuring in situ density and fabric of soils |
| JP2003035691A (en) * | 2001-07-23 | 2003-02-07 | Univ Kansai | Apparatus for measuring geological characteristics of rock |
| US7055371B2 (en) * | 2004-06-07 | 2006-06-06 | Johns Manville | On-site measurement of the density or thermal resistance of a material |
| CN102392148B (en) * | 2011-08-05 | 2013-01-23 | 太原理工大学 | Preparation method of aluminum-based boron carbide neutron absorption composite material |
| KR101651536B1 (en) * | 2014-05-29 | 2016-08-29 | 한국철도기술연구원 | System for evaluating compaction degree of railway roadbed using tdr (time domain reflectometry),and method for the same |
| CN104006986A (en) * | 2014-06-06 | 2014-08-27 | 黄河水利委员会黄河水利科学研究院 | Deep layer sampling system and method of coarse sand riverbed of sediment-laden river |
| CN110887764B (en) * | 2019-12-23 | 2024-06-14 | 中交第一航务工程局有限公司 | Underwater silt property in-situ tester and testing method |
-
2020
- 2020-05-06 CN CN202010372795.4A patent/CN111562195B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212206982U (en) * | 2020-05-06 | 2020-12-22 | 湖北省路桥集团有限公司 | Crank slider device for circularly measuring temperature, humidity and penetration resistance of soil body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111562195A (en) | 2020-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10816448B2 (en) | Device for measuring strength and strain softening parameters of saturated clay sample based on full-flow penetration | |
| CN109470580B (en) | Method for evaluating cohesive soil strength parameters of different sea areas in China | |
| CN111562195B (en) | A method and device for rapid in-situ determination of dry density of fine-grained soil | |
| CN114813374B (en) | Loess subgrade settlement test and calculation method | |
| CN114910367A (en) | A set of indoor static penetration and bending element combined test system suitable for soil size and strain measurement | |
| CN213239507U (en) | Thin-wall soil sampler for in-situ determination of water content of cohesive soil | |
| CN109799140A (en) | The field test measuring method of unsaturated soil strength characteristics | |
| CN212206982U (en) | Crank slider device for circularly measuring temperature, humidity and penetration resistance of soil body | |
| CN110424363A (en) | A kind of weak soil soil response intensive parameter long range method for continuous measuring | |
| CN212060013U (en) | Bored concrete pile reaming interior concrete quality detection device based on concrete hydration heat | |
| CN110455712B (en) | A sample preparation device and testing method for inverting sample preparation to measure the adhesion force at the interface between special curved surfaces and soil | |
| CN121253633A (en) | In-situ detection device and method integrating electrochemical impedance spectroscopy technology and static sounding | |
| CN215065458U (en) | An underwater sludge detection device | |
| CN118345886A (en) | Deep sea sediment mechanical property evaluation method based on indoor static sounding test | |
| CN208187733U (en) | A kind of artificial multistage drawing out soil equipment | |
| CN205898732U (en) | But bluetooth formula soil moisture apparatus of layering survey | |
| CN221445712U (en) | In-situ shear strength testing device for soil in hole | |
| CN209559657U (en) | Sedimentation Column Tester Combined with Lateral Pressure and Vacuum Preload | |
| CN203361119U (en) | Energy environment static sounding probe capable of measuring temperature of deep soil | |
| CN110230327B (en) | Real-time monitoring system and method for sand pile construction quality | |
| CN113945464B (en) | Indoor testing device and testing method for accumulation body of reservoir bank slope hydro-fluctuation belt | |
| CN201665880U (en) | A device for measuring internal displacement of soil | |
| JP2024053643A (en) | Evaluation method for the effect of ground improvement using cement-based ground improvement methods | |
| Reiffsteck et al. | Measurements of soil deformation by means of cone penetrometer | |
| CN110208849A (en) | Elastic wave bottom hole solution cavity, underground cavity detection device and the method for Wet-dry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method and device for in-situ rapid determination of dry density of fine-grained soil Granted publication date: 20240809 Pledgee: Agricultural Bank of China Limited Wuhan Development Zone Branch Pledgor: HUBEI PROVINCIAL ROAD & BRIDGE Co.,Ltd. Registration number: Y2025980044785 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |