CN109752304B - Variable water head soil permeability coefficient measuring device - Google Patents
Variable water head soil permeability coefficient measuring device Download PDFInfo
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- CN109752304B CN109752304B CN201910145629.8A CN201910145629A CN109752304B CN 109752304 B CN109752304 B CN 109752304B CN 201910145629 A CN201910145629 A CN 201910145629A CN 109752304 B CN109752304 B CN 109752304B
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Abstract
The invention provides a variable water head soil permeability coefficient measuring device which comprises a test support, a sealing cover, a test cylinder, a mesh, a water tank and a variable water head pipe, wherein a soil body to be measured is placed in the test cylinder, the test cylinder is placed on the test support, the sealing cover, the test cylinder, the mesh and the water tank are sequentially connected from top to bottom, the test cylinder comprises a test cylinder upper part and a test cylinder lower part which are in threaded connection, the upper end and the lower end of the test cylinder upper part and the test cylinder lower part are both open, a plurality of overflow holes which are arranged at equal intervals are formed in the cylinder wall of the test cylinder upper part, the variable water head pipe is vertically connected to the overflow holes, the upper end of the mesh is open, the lower end of the mesh is closed and is provided with a plurality of small holes, permeable stones are placed in the mesh, the upper end of the water tank is open, the lower end of the water tank is closed, water injected into the variable water head pipe flows into the test cylinder from the overflow holes, then flows through the soil body to be measured to permeate, flows into the water tank to flow out through the water tank, and the permeability coefficient of the soil body to be measured is calculated according to the water amount change in the variable water head pipe.
Description
Technical Field
The invention relates to the technical field of geotechnical tests, in particular to a variable water head soil permeability coefficient measuring device.
Background
The permeability coefficient is a quantitative index for representing the soil permeability, is a basic parameter which must be used when the seepage calculation is carried out, and has important effects on the aspects of soil improvement treatment, various underground engineering constructions and the like. At present, the soil permeameter is divided into a constant head type and a variable head type, a constant head test is suitable for measuring the permeability coefficient of sandy soil with high water permeability, and a variable head test is suitable for measuring the permeability coefficient of cohesive soil with low water permeability. Both the normal water head method and the variable water head method are measured in a laboratory, and can affect the water content, quality and structure of soil to a certain extent in the process of transporting by using a cutting ring cylinder sample, thereby causing larger errors. Although the permeability coefficient value measured by the traditional test method for field well hole pumping or well hole water injection is reliable, the traditional test method damages the surface soil body, cannot accurately measure the permeability coefficient of the soil containing the surface soil, and has higher cost and longer time. Therefore, if the test device capable of measuring the soil permeability coefficient by using the permeability cylinder at the in-situ point is provided under the condition of reducing the soil disturbance, the transport cost and the disturbance error are reduced while the accuracy of the soil permeability coefficient is increased.
Disclosure of Invention
In view of this, the invention provides a variable water head soil permeability coefficient measuring device which is simple in structure and capable of effectively reducing disturbance errors.
The invention provides a variable water head soil permeability coefficient measuring device which comprises a test support, a sealing cover, a test cylinder, a mesh, a water tank and a variable water head pipe, wherein a soil body to be measured is placed in the test cylinder, the test cylinder is placed on the test support, the sealing cover, the test cylinder, the mesh and the water tank are sequentially connected from top to bottom, the test cylinder comprises a test cylinder upper part and a test cylinder lower part which are in threaded connection, the upper end and the lower end of the test cylinder upper part and the test cylinder lower part are both open, a plurality of overflow holes which are arranged at equal intervals are formed in the cylinder wall of the test cylinder upper part, the variable water head pipe is vertically connected to the overflow holes, the upper end of the mesh is open, the lower end of the mesh is closed and is provided with a plurality of small holes, water permeable stones are placed in Kong Wangna, the upper end of the water tank is open, the lower end of the water tank is closed, water injected into the variable water head pipe flows into the test cylinder from the overflow holes, then flows through the soil body to be measured to generate permeability, flows into the water tank to flow out through the water tank, and calculates the permeability coefficient of the soil body to be measured according to the water quantity change in the variable water head pipe.
Further, variable head soil permeability coefficient survey device still includes to revolve wrong pole lid, revolve wrong pole lid and include the lid and revolve wrong pole, the lower extreme of lid and the upper end screw-thread fit on a test section of thick bamboo upper portion, be equipped with the cross hole post on the lid, be equipped with vertical hole on the cross hole post, revolve wrong pole including revolving wrong pole straight-bar and revolving wrong pole chassis, revolve wrong pole straight-bar pass vertical hole and with vertical hole screw-thread fit, the bottom of revolving wrong pole straight-bar is globular curved surface, be close to the bottom department of revolving wrong pole straight-bar and be equipped with and revolve wrong pole straight-bar fixed connection's first ring, revolve the top on wrong pole chassis and connect the second ring, the second ring is passed to the bottom of revolving pole straight-bar, the internal diameter of second ring is greater than and revolves the external diameter of wrong pole straight-bar and is less than the first ring's external diameter.
Further, the calculation formula of the permeability coefficient of the soil body to be detected is as follows:
k T ＝2.3a(L 2 -L 1 )/(A(t 2 -t 1 ))*log(H 1 /H 2 )
in the formula, k T The permeability coefficient of the soil body to be measured; a is the internal cross-sectional area of the variable water head pipe; a is the internal cross-sectional area of the test cylinder; l is 1 When the base plate of the screwing rod is flush with the lower port of the lower part of the test cylinder, the straight rod of the screwing rod is positioned at the length outside the test cylinder; l is 2 When the base plate of the screwing rod is just contacted with the upper part of a soil body, the straight rod of the screwing rod is positioned at the length outside the test cylinder; t is t 1 Is the initial moment of the test; t is t 2 Is the test end time; h 1 Scales of water in the water head pipe when the test starts; h 2 The scale of the water in the water head pipe is the time varying water head pipe when the test is finished.
Furthermore, the variable head soil permeability coefficient measuring device further comprises an auxiliary soil sampling cylinder, the upper end and the lower end of the auxiliary soil sampling cylinder are open, the inner diameter of the auxiliary soil sampling cylinder is consistent with the inner diameter of the upper portion of the test cylinder, and the lower end of the auxiliary soil sampling cylinder is in threaded fit with the upper end of the upper portion of the test cylinder.
Further, the variable head soil permeability coefficient measuring device further comprises a ring cutter cylinder, the upper end and the lower end of the ring cutter cylinder are open, the inner diameter of the ring cutter cylinder is consistent with the inner diameter of the lower portion of the test cylinder, the upper end of the ring cutter cylinder is in threaded fit with the lower end of the lower portion of the test cylinder, and a cutting edge is arranged at the lower end of the ring cutter cylinder.
Furthermore, the test support comprises a test support cylinder and three test support legs, the test support legs are hinged to the test support cylinder, the upper end and the lower end of the test support cylinder are open, a first notch and a second notch are formed in the upper end of the test support cylinder, a first pedal and a second pedal are arranged on the cylinder wall of the lower portion of the test cylinder, the shape of the first pedal is matched with that of the first notch, the shape of the second pedal is matched with that of the second notch, the first pedal is clamped on the first notch, and the second pedal is clamped on the second notch.
Further, the sealing cover comprises a sealing cover upper portion and a sealing cover lower portion, the lower end of the sealing cover upper portion is in threaded fit with the upper end of the test cylinder upper portion, the outer diameter of the sealing cover lower portion is consistent with the inner diameter of the test cylinder upper portion, and the sealing cover seals the test cylinder upper portion.
Furthermore, a water tank water outlet is formed in the side wall of the water tank and connected with the first rubber pipe.
Further, variable head soil permeability coefficient survey device still includes hits real support, hit real support and include bottom plate and two vertical poles, two vertical poles fixed connection respectively in the top of bottom plate, all set up a horizontal pin hole on every vertical pole, insert the support pin in the horizontal pin hole, still be equipped with the horizontal hole on the cross hole post, horizontal hole and support pin screw-thread fit.
Furthermore, the second circular ring is connected with the screwing rod base plate through three circular ring supports, one end of each circular ring support is connected to the screwing rod base plate, and the other end of each circular ring support is connected with the second circular ring.
The technical scheme provided by the invention has the beneficial effects that:
1. the variable water head soil permeability coefficient measuring device provided by the invention can be put on a terrain with better adaptability, can be used for carrying out test operation on uneven terrain, and overcomes the problem that most existing permeability coefficient measuring devices have higher requirements on placing places;
2. according to the invention, the spiral rotating rod cover, the test cylinder, the mesh, the water tank, the sealing cover and the variable water head pipe are matched, so that the permeability coefficient of the soil body can be measured under the conditions of effectively avoiding disturbance to the soil body and damage to surface soil and a soil covering layer, and the result of the measured permeability coefficient is closer to the true value of original soil;
3. the permeability coefficient of the laboratory proportioning soil under a certain porosity requirement can be simply and conveniently measured through the compaction device;
4. the invention can change the water level of the variable water head pipe under the condition of not changing the soil body, thereby carrying out a plurality of groups of tests to improve the accuracy of the result.
Drawings
FIG. 1 is a schematic structural diagram of a variable head soil permeability coefficient measuring device according to the present invention.
FIG. 2 is a schematic view showing the connection of a test cylinder, a mesh and a water tank of the variable head soil permeability coefficient measuring device of the present invention.
FIG. 3 is a schematic structural view of a sealing cover of the variable head soil permeability coefficient measuring apparatus according to the present invention.
FIG. 4 is a schematic structural diagram of the matching of the mesh and the test cylinder of the variable head soil permeability coefficient measuring device of the invention.
FIG. 5 is a schematic structural diagram of the cooperation of an auxiliary soil sampling cylinder, a test cylinder and a cutting ring cylinder of the variable head soil permeability coefficient measuring device of the invention.
FIG. 6 is an exploded schematic view of the combination of an auxiliary soil sampling cylinder, a test cylinder and a cutting ring cylinder of the variable head soil permeability coefficient measuring device of the present invention.
FIG. 7 is a schematic structural diagram of a compacting support of the variable head soil permeability coefficient measuring device of the present invention.
Fig. 8 is a schematic structural view of a screw cap of the variable head soil permeability coefficient measuring device of the present invention.
FIG. 9 is an enlarged view of a screw base of the device for measuring permeability coefficient of variable head soil according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 9, an embodiment of the present invention provides a variable head soil permeability coefficient measuring device, including a test support 1, a sealing cover 2, a test cylinder 3, a mesh 4, a water tank 5, a variable head pipe 6, an auxiliary soil sampling cylinder 7, a ring cutter cylinder 8, a screw rod cover 9 and a compaction support 10, wherein the sealing cover 2, the test cylinder 3, the mesh 4 and the water tank 5 are sequentially connected by a thread from top to bottom, and the test cylinder 3 is placed on the test support 1.
The method comprises the steps that soil is placed in a test cylinder 3, the test cylinder 3 comprises a test cylinder upper portion 31 and a test cylinder lower portion 32 which are in threaded connection, the test cylinder upper portion 31 and the test cylinder lower portion 32 are consistent in size, the upper end and the lower end of the test cylinder upper portion 31 and the test cylinder lower portion 32 are both open, four overflow holes 311 which are arranged at equal intervals are formed in the cylinder wall of the test cylinder upper portion 31, overflow hole covers 312 are arranged at the overflow holes 311, protruding cylinders made of metal materials are arranged in the middle of the overflow hole covers 312, the outer diameters of the protruding cylinders are the same as the inner diameters of the overflow holes 311, the overflow holes 311 are sealed by placing the protruding cylinders of the overflow hole covers 312 in the overflow holes 311, and when a variable water head test is carried out, a variable water head pipe 6 is connected to the selected overflow holes 311, and the variable water head pipe 6 is kept vertical; the wall of the lower part 32 of the test tube is provided with a first triangular pedal 321 and a second triangular pedal 322, the first pedal 321 and the second pedal 322 are symmetrical about the center of the lower part 32 of the test tube, the shape of the first pedal 321 is matched with that of a first notch 111 on the cylinder 11 of the test support, the shape of the second pedal 322 is matched with that of a second notch 112 on the cylinder 11 of the test support, the test tube 3 is clamped on the cylinder 11 of the test support by clamping the first pedal 321 on the first notch 111 and clamping the second pedal 322 on the second notch 112, and the outer diameter of the lower part 32 of the test tube is the same as the inner diameter of the cylinder 11 of the test support.
Referring to fig. 3, the sealing cap 2 includes an upper sealing cap portion 21 and a lower sealing cap portion 22 which are integrally connected, the upper end of the upper sealing cap portion 21 is closed, the lower end of the upper sealing cap portion 21 is in threaded fit with the upper end of the upper test tube portion 31, the outer diameter of the lower sealing cap portion 22 is identical to the inner diameter of the upper test tube portion 31, the upper test tube portion 31 is sealed by the sealing cap 2, and the lower sealing cap portion 22 is a cylindrical structure made of foam.
Referring to fig. 4, the upper end of the mesh 4 is open, the lower end of the mesh 4 is closed and is provided with a plurality of small holes (not shown), a cylindrical permeable stone 41 is placed in the mesh 4, the diameter of the permeable stone 41 is consistent with the inner diameter of the test cylinder lower part 32, the mesh 4 is of a cylindrical structure, the inner diameter and the wall thickness of the mesh 4 are consistent with the inner diameter and the wall thickness of the test cylinder lower part 32, and the upper end of the mesh 4 is in threaded fit with the lower end of the test cylinder lower part 32.
The upper end of basin 5 is uncovered, and the lower extreme of basin 5 is sealed, and basin 5 is the tubular construction, and the internal diameter of basin 5, wall thickness are unanimous with the internal diameter of mesh 4, wall thickness, and the lower extreme screw-thread fit of the upper end of basin 5 and mesh 4 offers basin delivery port 51 on the lateral wall of basin 5, and first rubber tube 52 is connected to basin delivery port 51, is equipped with first stagnant water on the first rubber tube 52 and presss from both sides 53.
Referring to fig. 5 and 6, the inner diameter of the auxiliary soil-sampling cylinder 7 is the same as the inner diameter of the upper part 31 of the test cylinder, the length of the auxiliary soil-sampling cylinder 7 is larger than that of the test cylinder 3, the upper end and the lower end of the auxiliary soil-sampling cylinder 7 are open, two handles 71 located on two sides of the diameter line of the cylinder wall are arranged on the cylinder wall of the auxiliary soil-sampling cylinder 7, and the lower end of the auxiliary soil-sampling cylinder 7 is in threaded fit with the upper end of the upper part 31 of the test cylinder.
Referring to fig. 5 and 6, the annular knife cylinder 8 is of a cylinder structure, the upper end and the lower end of the annular knife cylinder 8 are open, the inner diameter and the wall thickness of the annular knife cylinder 8 are consistent with those of the lower part 32 of the test cylinder, the upper end of the annular knife cylinder 8 is in threaded fit with the lower end of the lower part 32 of the test cylinder, the lower end of the annular knife cylinder 8 is provided with a knife edge, the knife edge is in contact with soil to cut the soil after the annular knife cylinder 8 is stressed, and the cut soil is retained in the lower part 32 of the test cylinder.
Referring to fig. 8 and 9, the screw cap 9 includes a cap body 91 and a screw 92, the lower end of the cap body 91 is in threaded fit with the upper end of the upper portion 31 of the test cartridge, the center of the cap body 91 is opened, the cap body 91 is provided with a cross-shaped hole column 911, the cross-shaped hole column 911 is provided with a vertical hole 912 and a horizontal hole 913 which are communicated with each other, the vertical hole 912 is communicated with the center of the cap body 91, the screw 92 includes a screw straight rod 921 and a screw base plate 922, the upper end of the screw straight rod 921 is provided with a screw knob 923, the screw straight rod 921 passes through the centers of the vertical hole 912 and the cap body 91 and is in threaded fit with the vertical hole 912, the screw straight rod 921 moves up and down in the cross-shaped hole column 911 through the threaded fit, the bottom end of the screw straight rod 921 is spherically curved, a first circular ring 924 integrally connected with the screw 921 is provided near the bottom end of the screw straight rod 921, a second circular ring 925 is connected directly above the screw base plate 922, the second ring 925 is located above the first ring 924, the bottom end of the screw rod straight rod 921 passes through the second ring 925, the inner diameter of the second ring 925 is slightly larger than the diameter of the screw rod straight rod 921 and smaller than the outer diameter of the first ring 924, so that the screw rod straight rod 921 can rotate relative to the screw rod chassis 922 and move up and down relative to the screw rod chassis 922 within a certain range, the screw rod straight rod 921 is limited by the second ring 925 when moving upwards to the highest position, the screw rod straight rod 921 is limited by the screw rod chassis 922 when moving downwards to the lowest position, the second ring 925 and the screw rod chassis 922 are connected through three ring supports 926, one end of each ring support 926 is integrally connected to the screw rod chassis 922, the other end of each ring support 926 is integrally connected with the second ring 925, and the three ring supports 926 use the center point of the screw rod chassis 922 as the center point.
Referring to fig. 7, the tamping support 10 includes a bottom plate 101 and two vertical rods 102, the two vertical rods 102 are respectively and fixedly connected above the bottom plate 101, each vertical rod 102 is provided with a horizontal pin hole 103, a support pin 104 is inserted into the horizontal pin hole 103, and the support pin 104 is in threaded fit with a horizontal hole 913 of the cross-shaped hole column 911.
In order to ensure the sealing performance of the variable water head soil permeability coefficient measuring device, rubber rings are arranged at the threaded connection positions, and rubber sleeves 313 are arranged at the water tank water outlet 51 and the overflow hole 311.
When the variable head soil permeability coefficient measuring device provided by the invention is used for carrying out an in-situ cohesive soil variable head test, the steps are as follows:
step S101, sequentially combining an auxiliary soil sampling cylinder 7, an upper test cylinder part 31, a lower test cylinder part 32 and a cutting ring cylinder 8 into a soil sampling device from top to bottom;
step S102, inserting the soil taking device assembled in the step S101 into a soil body to be tested, inserting the soil body into the soil body to be tested to a certain depth to enable the thickness of the soil body above an upper port line of the annular cutter cylinder 8 to be approximately equal to the thickness of the soil body to be tested, and in the process that the soil taking device is inserted into the soil body to be tested, simultaneously treading the first pedal 321 and the second pedal 322 or putting heavy objects with equal weight on the first pedal 321 and the second pedal 322 to enable the first pedal 321 and the second pedal 322 to be stressed equally, so that the integrity of sampling can be effectively guaranteed, and the original structure and composition are effectively reserved; when the soil thickness above the upper port line of the circular cutter cylinder 8 is about the soil thickness to be tested, stopping treading the first pedal 321 and the second pedal 322 or unloading the heavy objects on the first pedal 321 and the second pedal 322, and simultaneously reducing the rotation of the test cylinder 3 as much as possible;
step S103, taking down the auxiliary soil taking barrel 7, installing a screwing rod cover 9 on the upper portion 31 of the test barrel, screwing a screwing rod straight rod 921 through a screwing rod knob 923 to enable a screwing rod base plate 922 to be in right contact with the upper portion of a soil body, measuring to obtain the length of the screwing rod straight rod 921 outside the test barrel 3, and recording the length as L 2 ；
Step S104, excavating the soil around the soil taking device, cutting the soil below the cutting ring barrel 8 by using an iron sheet or a soil cutting sheet, and slowly reversing the iron sheet and the cutting ring barrel 8 to be horizontal by using hands;
step S105, taking down the cutting ring barrel 8, cutting the soil body parallel to the lower port of the lower part 32 of the test barrel to enable the section to be flush with the lower port of the lower part 32 of the test barrel, and then connecting the hole net 4 filled with the permeable stones 41;
step S106, leveling the test bracket 1 by using a leveling gauge 113, placing the test cylinder 3 filled with soil on the test bracket 1, and connecting the water tank 5 to the lower end of the mesh 4;
step S107, taking down the screw rod cover 9, and if the taken soil body has no covering layer substances, paving a gravel layer on the surface layer of the soil body;
step S108, covering the sealing cover 2 on the upper part 31 of the test cylinder, taking down the overflow hole cover 312 at the lowest overflow hole 311, connecting the water head changing pipe 6 to the lowest overflow hole 311 by using a rubber sleeve 313, and keeping the water head changing pipe 6 vertical;
step S109, sealing other overflow holes 311 by using overflow hole covers 312, and connecting a first rubber pipe 52 at the water outlet 51 of the sink;
step S110, injecting water into the variable water head pipe 6 to a certain height, discharging bubbles in the variable water head pipe 6, opening the first water stop clamp 53, and performing a test;
step S111, measuring initial time t 1 Scale H of time-varying water head pipe 6 1 And t after a certain period of time 2 Scale H of time-varying head pipe 6 2 And the water temperature T at the sink outlet 51;
step S112, calculating the permeability coefficient k T Coefficient of permeability k T The calculation formula of (2) is as follows:
k T ＝2.3a(L 2 -L 1 )/(A(t 2 -t 1 ))*log(H 1 /H 2 )
in the formula, a is the internal cross-sectional area of the variable water head pipe 6; a is the internal cross-sectional area of the test tube 3, L 1 When the screw rod base plate 922 is flush with the lower port of the lower part 32 of the test cylinder, the screw rod straight rod 921 is located at the length outside the test cylinder 3;
and step S113, changing the water injection amount of the variable water head pipe 6, repeatedly executing the steps S110-S112 for a plurality of times (generally 5-6 times), and finishing the test when the difference value of the permeability coefficients measured for a plurality of times is within the error allowable range.
When the variable water head soil permeability coefficient measuring device provided by the invention is used for carrying out a variable water head test of laboratory proportioning cohesive soil, the variable water head test comprises the following steps:
step S201, connecting the upper part 31 of the test cylinder, the lower part 32 of the test cylinder and the mesh 4 from top to bottom in sequence;
step S202, calculating the volume of the loaded soil body when the loaded soil body is pressed into the required pore ratio, and converting the volume into the height of the soil body in the test tube 3;
step S203, loading the assembled quantitative soil body into the test cylinder 3, covering the screwing rod cover 9, and connecting the screwing rod cover 9 with the compaction support 10;
step S204, screwing the straight screw rod 921, obtaining the height of the soil body by measuring the length of the straight screw rod 921 outside the cover 91, extruding the soil body to the calculated height, placing for a certain time to enable the height to be stable, measuring the length of the straight screw rod 921 outside the test tube 3, and recording as L 2 ；
Step S205, the test cylinder 3 is taken down from the compaction support 10, the screw rod cover 9 is taken down, then the test cylinder 3 is placed on the leveled test support 1, the water tank 5 is connected, and then the test and the calculation of the permeability coefficient are carried out according to the steps S108 to S113.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A variable head soil permeability coefficient measuring device is characterized by comprising a test support, a sealing cover, a test cylinder, a mesh, a water tank and a variable head pipe, wherein a soil body to be measured is placed in the test cylinder, the test cylinder is placed on the test support, the sealing cover, the test cylinder, the mesh and the water tank are sequentially connected from top to bottom, the test cylinder comprises a test cylinder upper part and a test cylinder lower part which are in threaded connection, the upper end and the lower end of the test cylinder upper part and the test cylinder lower part are both open, a plurality of overflow holes which are arranged at equal intervals are formed in the cylinder wall of the test cylinder upper part, the variable head pipe is vertically connected to the overflow holes, the upper end of the mesh is open, the lower end of the mesh is closed and is provided with a plurality of small holes, water permeable stones are placed in Kong Wangna, the upper end of the water tank is open, the lower end of the water tank is closed, water injected into the variable head pipe flows into the test cylinder from the overflow holes, then flows through the soil body to be measured to generate permeability, and then flows into the water tank to flow out, and the permeability coefficient of the soil body to be measured is calculated according to the change of the water amount in the variable head pipe;
become flood peak soil osmotic coefficient survey device still including revolving the pole lid, revolve to revolve the pole lid and include the lid and revolve wrong pole, the lower extreme of lid and the upper end screw-thread fit on a test section of thick bamboo upper portion, be equipped with the cross hole post on the lid, be equipped with vertical hole on the cross hole post, revolve to revolve wrong pole including revolving wrong pole straight-bar and revolving wrong pole chassis, revolve wrong pole straight-bar pass vertical hole and with vertical hole screw-thread fit, the bottom of revolving wrong pole straight-bar is globular curved surface, be close to the bottom department of revolving wrong pole straight-bar and be equipped with and revolve first ring of wrong pole straight-bar fixed connection, revolve the top of revolving wrong pole chassis and connect the second ring, the bottom of revolving wrong pole straight-bar passes the second ring, the internal diameter of second ring is greater than and revolves the diameter of wrong pole straight-bar and is less than the external diameter of first ring.
2. The variable head soil permeability coefficient measuring device according to claim 1, wherein the calculation formula of the permeability coefficient of the soil body to be measured is:
k T ＝2.3a(L 2 -L 1 )/(A(t 2 -t 1 ))*log(H 1 /H 2 )
in the formula, k T The permeability coefficient of the soil body to be measured; a is the internal cross-sectional area of the variable water head pipe; a is the internal cross-sectional area of the test cylinder; l is a radical of an alcohol 1 When the base plate of the screwing rod is flush with the lower port of the lower part of the test cylinder, the straight rod of the screwing rod is positioned at the length outside the test cylinder; l is 2 When the rotating rod chassis is just contacted with the upper part of the soil body, the rotating rod straight rod is positioned at the length outside the test cylinder; t is t 1 Is the initial moment of the test; t is t 2 Is the test end time; h 1 Scales of water in the water head pipe when the test begins; h 2 For changing water at the end of the testGraduations of the water in the head tube.
3. The variable head soil permeability coefficient measuring device according to claim 1, further comprising an auxiliary soil sampling cylinder, wherein the upper end and the lower end of the auxiliary soil sampling cylinder are open, the inner diameter of the auxiliary soil sampling cylinder is consistent with the inner diameter of the upper part of the test cylinder, and the lower end of the auxiliary soil sampling cylinder is in threaded fit with the upper end of the upper part of the test cylinder.
4. The variable head soil permeability coefficient measuring device according to claim 1, further comprising a circular knife cylinder, wherein the upper end and the lower end of the circular knife cylinder are open, the inner diameter of the circular knife cylinder is consistent with the inner diameter of the lower portion of the test cylinder, the upper end of the circular knife cylinder is in threaded fit with the lower end of the lower portion of the test cylinder, and a knife edge is arranged at the lower end of the circular knife cylinder.
5. The variable head soil permeability coefficient measuring device according to claim 1, wherein the test support comprises a test support cylinder and three test support legs, the test support legs are hinged to the test support cylinder, the upper end and the lower end of the test support cylinder are open, a first notch and a second notch are formed in the upper end of the test support cylinder, a first pedal and a second pedal are arranged on the wall of the lower portion of the test cylinder, the shape of the first pedal is matched with that of the first notch, the shape of the second pedal is matched with that of the second notch, the first pedal is clamped on the first notch, and the second pedal is clamped on the second notch.
6. The variable head soil permeability coefficient measuring device according to claim 1, wherein the sealing cap includes an upper sealing cap portion and a lower sealing cap portion, a lower end of the upper sealing cap portion is screw-fitted to an upper end of the upper test tube portion, an outer diameter of the lower sealing cap portion is identical to an inner diameter of the upper test tube portion, and the upper sealing cap seals the upper test tube portion.
7. The variable head soil permeability coefficient measuring device as claimed in claim 1, wherein a water tank water outlet is provided on a side wall of the water tank, and the water tank water outlet is connected to the first rubber pipe.
8. The variable head soil permeability coefficient measuring device according to claim 1, characterized in that the variable head soil permeability coefficient measuring device further comprises a compaction support, the compaction support comprises a bottom plate and two vertical rods, the two vertical rods are respectively and fixedly connected above the bottom plate, a horizontal pin hole is formed in each vertical rod, a support pin is inserted into each horizontal pin hole, a horizontal hole is further formed in each cross-shaped hole column, and the horizontal hole is in threaded fit with the support pin.
9. The variable water head soil permeability coefficient measuring device according to claim 1, wherein the second circular ring is connected with the screw rod chassis through three circular ring supports, one end of each circular ring support is connected to the screw rod chassis, and the other end of each circular ring support is connected with the second circular ring.
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| CN201910145629.8A CN109752304B (en) | 2019-02-27 | 2019-02-27 | Variable water head soil permeability coefficient measuring device |
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| CN110376115B (en) * | 2019-08-30 | 2024-04-30 | 贵州大学 | Double-ring water seepage test device with two rings integrated and operation method thereof |
| CN114813504A (en) * | 2022-04-08 | 2022-07-29 | 中国长江三峡集团有限公司 | Drawing seepage coupling test device and method for anchor adding sample under high temperature and high pressure |
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