CN104990947A - Bilateral frost-heaving test device for porous materials and testing method - Google Patents
Bilateral frost-heaving test device for porous materials and testing method Download PDFInfo
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- CN104990947A CN104990947A CN201510434795.1A CN201510434795A CN104990947A CN 104990947 A CN104990947 A CN 104990947A CN 201510434795 A CN201510434795 A CN 201510434795A CN 104990947 A CN104990947 A CN 104990947A
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Abstract
The invention relates to a bilateral frost-heaving test device for porous materials and a testing method. In the prior art, the changes of temperature field, water field, and deformation filed have not been taken into account during the freezing and thawing process of porous materials, thus the frost-heaving resistant performance of porous materials cannot be precisely evaluated, and in order to solve the problem mentioned above, the invention provides the bilateral frost-heaving test device. The test device comprises a pressure machine, a constant-temperature constant-moisture curing box, a reaction frame top tray, a reaction frame support, a first water storage tube, a second water storage tube, a cylinder, a pedestal, a frost-heaving test-piece assembly, a pressure head, a test tube rack, a LVDT displacement sensor, a pressure sensor, a data collector, and two cold-bath circulators. The LVDT displacement sensor is installed on the body of the cylinder and is close to a piston rod. The reaction frame top tray is fixedly arranged on the top end of the reaction frame support. The pedestal is fixedly arranged on the bottom end of the reaction frame support. The frost-heaving test-piece assembly is fixedly arranged on the pedestal. The provided bilateral frost-heaving test device is used to carry out porous material frost-heaving tests.
Description
Technical field
The present invention relates to a kind of porosint test unit, be specifically related to a kind of bilateral frost heave test device for porosint and test method.
Background technology
The seasonal frost action of cold district can cause the engineering problems such as a series of frost heave, thaw collapse, freeze-thaw damage, the change of temperature field, moisture field and deformation field in order to observe porosint freezing in testing laboratory, in melting process, evaluate the ability of porosint opposing frost heave, thaw collapse and Frozen-thawed cycled combined action, but in prior art, also there is no the device that can solve problems.
Summary of the invention
The present invention is in order to solve the change adopting in prior art and also do not have to solve porosint temperature field, moisture field and deformation field freezing, in melting process, evaluate the problem of porosint opposing frost heave ability test device, and then provide a kind of bilateral Frost heave and thaw subsidence test unit for porosint.
The present invention is the technical scheme adopted that solves the problem:
For a bilateral frost heave test device for porosint, it comprises pressing machine, constant-temp. and-moisture maintenance, reaction frame are taken over a business, reaction frame support, the first water test tube, the second water test tube, cylinder, base, frost heave specimen sleeve arrangement, pressure head, test tube rack, LVDT displacement transducer, pressure transducer, data acquisition unit and two cryostat circulators, LVDT displacement transducer is arranged on cylinder barrel near piston rod place, reaction frame takes over a business to be fixedly mounted on the top of frame support, base is fixedly mounted on the bottom of reaction frame support, frost heave specimen sleeve arrangement is fixedly mounted on base, cylinder is vertically arranged on the below that reaction frame is taken over a business, and the rear end cap of cylinder barrel is mounted by means of bolts on the lower surface that reaction frame takes over a business, the external part of cylinder piston rod is installed with a pressure head, the bottom of pressure head is processed with arc convex, arc convex withstands on the top of frost heave specimen sleeve arrangement, first water test tube is communicated with the top of frost heave specimen sleeve arrangement, second water test tube is communicated with the bottom of frost heave specimen sleeve arrangement, test tube rack is arranged in constant-temp. and-moisture maintenance, first water test tube and the second water test tube are arranged on test tube rack, pressing machine and two cryostat circulators are arranged near constant-temp. and-moisture maintenance, and the sidewall that two connecting pipes on a cryostat circulator pass constant-temp. and-moisture maintenance is communicated with the top of frost heave specimen sleeve arrangement, two connecting pipes of another cryostat circulator are communicated with the bottom of frost heave specimen sleeve arrangement through the sidewall of constant-temp. and-moisture maintenance, pressing machine is communicated with cylinder by two high-pressure gas pipelines, pressure transducer is arranged on high-pressure gas pipeline, LVDT displacement transducer is all connected with data acquisition unit with pressure transducer.
For a bilateral Frost heave and thaw subsidence test method for porosint, realize in the steps below during described method:
Step one: be placed in+2 DEG C together with mould after water treatment of being satisfied by the test porosint after shaping, health 6h in the climatic chamber of 98% humidity;
Step 2: the gravity direction of multiple temperature sensor along test porosint is buried underground, and be embedded in the side of test porosint, distance between adjacent two temperature sensors is 25mm, the depth of burying of each temperature sensor is 15mm, and overlaps native latex film at the lateral wall of test porosint;
Step 3: the upper surface of test porosint and lower surface are pasted a filter paper respectively, then test porosint is placed between two permeable stones, and by geotechnological latex film, the top of leather sheath and the sealing of the first resilient seal circle are fixed on the first temperature control dish, by geotechnological latex film, the bottom of leather sheath and the sealing of the second resilient seal circle are fixed on the second temperature control dish, the first temperature control dish, the second temperature control dish, leather sheath and two permeable stones are arranged in the circular sleeve of multiple adiabatic ring composition;
Step 4: make the arc pit of rectangle projection on the arc convex of cylinder seaming chuck and the first temperature control dish interior and be in critical contact state;
Step 5: respectively data acquisition is carried out to LVDT displacement transducer, pressure transducer and temperature sensor by data acquisition unit;
Step 6: respectively liquid coolant is packed into two cryostat circulators and the first temperature control dish and the second temperature control dish, liquid coolant has loaded rear startup two cryostat circulators, respectively temperature control is carried out to the first temperature control dish and the second temperature control dish, the temperature of the first temperature control dish is made to control at-2 ° to-35 °, make the second temperature control dish temperature control at-2 ° to-35 °, after the first temperature control dish and the second temperature control dish temperature stabilization, start test;
Step 7: porosint frost-heaving deformation to be tested reaches steady state (SS), can stop experiment;
Step 8: take out the test porosint freezed, according to the interval stratified sampling of 15mm, test the mass water content of each layer position soil sample, and record data, complete test.
The invention has the beneficial effects as follows: 1, in the present invention, cryostat circulator 2 controls the first temperature control dish 13 and the second temperature control dish 14 control temperature, and achieved the directed heat transfer mode of side direction thermal insulation by adiabatic ring 17, can according to requirements set different freeze, thawing mode.
2, the present invention adopts outer circulation type temperature control system, by the outer circulation of liquid coolant, temperature control is carried out to the first temperature control dish 13 and the second temperature control dish 14, there is provided stable temperature load by the first temperature control dish 13 and the second temperature control dish 14, the operating accuracy of temperature control disk is ± 0.05 DEG C.
3, LVDT displacement transducer 18 is arranged on the external part of cylinder 8 piston rod, the vertical deformation of determination test porosint 21, and precision is 0.01mm, is measured the data of pressing machine 1 pressure by pressure transducer 19.
4 carry out data storage and analysis by data acquisition unit 20 to measuring the temperature of test porosint 21 diverse location and the displacement of test specimen vertical deformation and the data of pressing machine 1 pressure.
Test temperature can be controlled at-35 ° within the scope of 50 ° by the present invention by 5, so device of the present invention can realize the experiment in temperature-35 ° to scope between 50 °, experiment material being carried out to frost-heaving and thawing and Frozen-thawed cycled characteristic.
Accompanying drawing explanation
Fig. 1 is one-piece construction front view of the present invention, Fig. 2 is the front view of frost heave specimen sleeve arrangement 10, Fig. 3 is the front view of pressure head 11, Fig. 4 is the front view of the first temperature control dish 13, Fig. 5 is the cut-open view of A-A in Fig. 4, and Fig. 6 is the front view of the second temperature control dish 14, and Fig. 7 is the cut-open view of B-B in Fig. 6, Fig. 8 is the front view of adiabatic ring 17, and Fig. 9 is the vertical view of Fig. 8.
Embodiment
Embodiment one: composition graphs 1-Fig. 9 illustrates present embodiment, for bilateral frost heave test device and the test method of porosint, it comprises pressing machine 1, constant-temp. and-moisture maintenance 3, reaction frame take over a business 4, reaction frame support 5, first water test tube 6, second water test tube 7, cylinder 8, base 9, frost heave specimen sleeve arrangement 10, pressure head 11, test tube rack 12, LVDT displacement transducer 18, pressure transducer 19, data acquisition unit 20 and two cryostat circulators 2, LVDT displacement transducer 18 is arranged on cylinder 8 cylindrical shell near piston rod place, reaction frame takes over a business the top that 4 are fixedly mounted on frame support 5, base 9 is fixedly mounted on the bottom of reaction frame support 5, frost heave specimen sleeve arrangement 10 is fixedly mounted on base 9, cylinder 8 is vertically arranged on the below that reaction frame takes over a business 4, and the rear end cap of cylinder 8 cylindrical shell is mounted by means of bolts on reaction frame takes over a business on the lower surface of 4, the external part of cylinder 8 piston rod is installed with a pressure head 11, the bottom of pressure head 11 is processed with arc convex, arc convex withstands on the top of frost heave specimen sleeve arrangement 10, first water test tube 6 is communicated with the top of frost heave specimen sleeve arrangement 10, second water test tube 7 is communicated with the bottom of frost heave specimen sleeve arrangement 10, test tube rack 12 is arranged in constant-temp. and-moisture maintenance 3, first water test tube 6 and the second water test tube 7 are arranged on test tube rack 12, pressing machine 1 and two cryostat circulators 2 are arranged near constant-temp. and-moisture maintenance 3, and the sidewall that two connecting pipes on a cryostat circulator 2 pass constant-temp. and-moisture maintenance 3 is communicated with the top of frost heave specimen sleeve arrangement 10, two connecting pipes of another cryostat circulator 2 are communicated with the bottom of frost heave specimen sleeve arrangement 10 through the sidewall of constant-temp. and-moisture maintenance 3, pressing machine 1 is communicated with cylinder 8 by two high-pressure gas pipelines, pressure transducer 19 is arranged on high-pressure gas pipeline, LVDT displacement transducer 18 is all connected with data acquisition unit 20 with pressure transducer 19.
Embodiment two: composition graphs 1-Fig. 9 illustrates present embodiment, for bilateral frost heave test device and the test method of porosint, described frost heave specimen sleeve arrangement 10 comprises the first temperature control dish 13, second temperature control dish 14, leather sheath 15, two permeable stones 16, multiple temperature sensor and multiple adiabatic ring 17, leather sheath 15 is tubular leather sheath, multiple adiabatic ring 17 vertically arranges composition circular sleeve from top to bottom, second temperature control dish 14, two permeable stones 16 and the first temperature control dish 13 are successively set in circular sleeve from bottom to top, porosint to be tested is arranged between two permeable stones 16, porosint to be tested is provided with multiple temperature sensor, the top of leather sheath 15 is sleeved on the first temperature control dish 13, the bottom of leather sheath 15 is sleeved on the second temperature control dish 14, first temperature control dish 13 top is processed with the protruding 13-2 of rectangle, the top of the protruding 13-2 of rectangle is processed with arc pit, the bottom of pressure head 11 is arranged in arc pit, multiple temperature sensor is connected with data acquisition unit 20 by line, other is identical with embodiment one.
Embodiment three: composition graphs 1, Fig. 2, Fig. 4 and Fig. 5 illustrates present embodiment, a kind of bilateral frost heave test device for porosint and test method, described first temperature control dish 13 is circular slab, the inside of circular slab is radially processed with the first snakelike seal groove 13-1, the top of circular slab is processed with the first water-bath circulation fluid entrance, first water-bath loop exit and the first moisturizing pore, first water-bath circulation fluid entrance is communicated with all snakelike with the first seal groove 13-1 of the first water-bath loop exit, the rising pipe of the first water test tube 6 is arranged on permeable stone 16 place being positioned at top through the first moisturizing pore, and the first water-bath circulation fluid entrance is communicated with a cryostat circulator 2 respectively by a connecting pipe with the first water-bath loop exit, other is identical with embodiment two.
Embodiment four: composition graphs 1, Fig. 2, Fig. 6 and Fig. 7 illustrates present embodiment, a kind of bilateral frost heave test device for porosint and test method, described second temperature control dish 14 is circular slab, the inside of circular slab is radially processed with the second snakelike seal groove 14-1, the bottom of circular slab is processed with the second water-bath circulation fluid entrance, second water-bath loop exit and the second moisturizing pore, second water-bath circulation fluid entrance is communicated with all snakelike with the second seal groove 14-1 of the second water-bath loop exit, the rising pipe of the second water test tube 6 is arranged on permeable stone 16 place being positioned at below through the second moisturizing pore, and the second water-bath circulation fluid entrance is communicated with a cryostat circulator 2 respectively by a connecting pipe with the second water-bath loop exit, other is identical with embodiment three.
Embodiment five: composition graphs 1, Fig. 2, Fig. 4 and Fig. 5 illustrate present embodiment, a kind of bilateral frost heave test device for porosint and test method, described first temperature control dish 13 is along the circumferential direction processed with two annular grooves, the top of leather sheath 15 is sleeved on the first temperature control dish 13, and the outer cover of each annular groove is equipped with a first resilient seal circle, other is identical with embodiment two.
Embodiment six: composition graphs 1, Fig. 2, Fig. 6 and Fig. 7 illustrate present embodiment, a kind of bilateral frost heave test device for porosint and test method, described second temperature control dish 14 is along the circumferential direction processed with two annular grooves, the bottom of leather sheath 15 is sleeved on the second temperature control dish 14, and the outer cover of each annular groove is equipped with a second resilient seal circle, other is identical with embodiment four.
Embodiment seven: composition graphs 1, Fig. 2, Fig. 8 and Fig. 9 illustrates present embodiment, a kind of bilateral frost heave test device for porosint and test method, described each adiabatic ring 17 comprises two semicircle annulus and two web members, two semicircle annulus fasten composition annulus relatively, two intersections of two semicircle annulus are fixed by two web members, one end of each annulus is processed with annular protrusion, the other end of each annulus is processed with the annular groove corresponding with annular protrusion, adiabatic ring 17 is the adiabatic rings 17 be made up of acryhic material, other is identical with embodiment two.
Embodiment eight: composition graphs 1-Fig. 9 illustrates present embodiment, a kind of bilateral Frost heave and thaw subsidence test unit for porosint of present embodiment and test method, adopt device described in embodiment one, two, three, four, five, six or seven to realize, specific implementation step is as follows:
Step one: be placed in+2 DEG C together with mould after water treatment of being satisfied by the test porosint 21 after shaping, health 6h in the climatic chamber of 98% humidity;
Step 2: the gravity direction of multiple temperature sensor along test porosint 21 is buried underground, and be embedded in the side of test porosint 21, distance between adjacent two temperature sensors is 25mm, the depth of burying of each temperature sensor is 15mm, and overlaps native latex film at the lateral wall of test porosint 21;
Step 3: the upper surface of test porosint 21 and lower surface are pasted a filter paper respectively, then test porosint 21 is placed between two permeable stones 16, and by geotechnological latex film, the top of leather sheath 15 and the sealing of the first resilient seal circle are fixed on the first temperature control dish 13, by geotechnological latex film, the bottom of leather sheath 15 and the sealing of the second resilient seal circle are fixed on the second temperature control dish 14, the first temperature control dish 13, second temperature control dish 14, leather sheath 15 and two permeable stones 16 are arranged in circular sleeve that multiple adiabatic ring 17 forms;
Step 4: make the arc pit of rectangle projection on the arc convex of cylinder 8 seaming chuck 11 and the first temperature control dish 13 interior and be in critical contact state;
Step 5: respectively data acquisition is carried out to LVDT displacement transducer 18, pressure transducer 19 and temperature sensor by data acquisition unit 20;
Step 6: respectively liquid coolant is packed into two cryostat circulators 2 and the first temperature control dish 13 and the second temperature control dish 14, liquid coolant has loaded rear startup two cryostat circulators 2, respectively temperature control is carried out to the first temperature control dish 13 and the second temperature control dish 14, the temperature of the first temperature control dish 13 is made to control at-2 ° to-35 °, make the second temperature control dish 14 temperature control at-2 ° to-35 °, after the first temperature control dish 13 and the second temperature control dish 14 temperature stabilization, start test;
Step 7: porosint 21 frost-heaving deformation to be tested reaches steady state (SS), can stop experiment;
Step 8: take out the test porosint 21 freezed, according to the interval stratified sampling of 15mm, test the mass water content of each layer position soil sample, and record data, complete test.
Claims (8)
1. for a bilateral frost heave test device for porosint, it is characterized in that: it comprises pressing machine (1), constant-temp. and-moisture maintenance (3), reaction frame take over a business (4), reaction frame support (5), the first water test tube (6), the second water test tube (7), cylinder (8), base (9), frost heave specimen sleeve arrangement (10), pressure head (11), test tube rack (12), LVDT displacement transducer (18), pressure transducer (19) and data acquisition unit (20) and two cryostat circulators (2); LVDT displacement transducer (18) is arranged on cylinder (8) cylindrical shell near piston rod place, reaction frame is taken over a business, and (4) are fixedly mounted on the top of frame support (5), base (9) is fixedly mounted on the bottom of reaction frame support (5), frost heave specimen sleeve arrangement (10) is fixedly mounted on base (9), cylinder (8) is vertically arranged on the below that reaction frame takes over a business (4), and the rear end cap of cylinder (8) cylindrical shell is mounted by means of bolts on reaction frame takes over a business on the lower surface of (4), the external part of cylinder (8) piston rod is installed with a pressure head (11), the bottom of pressure head (11) is processed with arc convex, arc convex withstands on the top of frost heave specimen sleeve arrangement (10), first water test tube (6) is communicated with the top of frost heave specimen sleeve arrangement (10), second water test tube (7) is communicated with the bottom of frost heave specimen sleeve arrangement (10), test tube rack (12) is arranged in constant-temp. and-moisture maintenance (3), first water test tube (6) and the second water test tube (7) are arranged on test tube rack (12), pressing machine (1) and two cryostat circulators (2) are arranged near constant-temp. and-moisture maintenance (3), and the sidewall that two connecting pipes on a cryostat circulator (2) pass constant-temp. and-moisture maintenance (3) is communicated with the top of frost heave specimen sleeve arrangement (10), two connecting pipes of another cryostat circulator (2) are communicated with the bottom of frost heave specimen sleeve arrangement (10) through the sidewall of constant-temp. and-moisture maintenance (3), pressing machine (1) is communicated with cylinder (8) by two high-pressure gas pipelines, pressure transducer (19) is arranged on high-pressure gas pipeline, LVDT displacement transducer (18) is all connected with data acquisition unit (20) with pressure transducer (19).
2. a kind of bilateral frost heave test device for porosint according to claim 1, is characterized in that: described frost heave specimen sleeve arrangement (10) comprises the first temperature control dish (13), the second temperature control dish (14), leather sheath (15), two permeable stones (16), multiple temperature sensor and multiple adiabatic rings (17), leather sheath (15) is tubular leather sheath, multiple adiabatic ring (17) vertically arranges composition circular sleeve from top to bottom, second temperature control dish (14), two permeable stones (16) and the first temperature control dish (13) are successively set in circular sleeve from bottom to top, porosint to be tested (21) is arranged between two permeable stones (16), (21) are provided with multiple temperature sensor to porosint to be tested, the top of leather sheath (15) is sleeved on the first temperature control dish (13), the bottom of leather sheath (15) is sleeved on the second temperature control dish (14), first temperature control dish (13) top is processed with rectangle projection (13-2), the top of rectangle projection (13-2) is processed with arc pit, the bottom of pressure head (11) is arranged in arc pit, multiple temperature sensor is connected with data acquisition unit (20) by line.
3. a kind of bilateral frost heave test device for porosint according to claim 2, it is characterized in that: described first temperature control dish (13) is circular slab, the inside of circular slab is radially processed with the first snakelike seal groove (13-1), the top of circular slab is processed with the first water-bath circulation fluid entrance, first water-bath loop exit and the first moisturizing pore, first water-bath circulation fluid entrance is communicated with all snakelike with first seal groove (13-1) of the first water-bath loop exit, the rising pipe of the first water test tube (6) is arranged on permeable stone (16) place being positioned at top through the first moisturizing pore, and the first water-bath circulation fluid entrance is communicated with a cryostat circulator (2) respectively by a connecting pipe with the first water-bath loop exit.
4. a kind of bilateral frost heave test device for porosint according to claim 3, it is characterized in that: described second temperature control dish (14) is circular slab, the inside of circular slab is radially processed with the second snakelike seal groove (14-1), the bottom of circular slab is processed with the second water-bath circulation fluid entrance, second water-bath loop exit and the second moisturizing pore, second water-bath circulation fluid entrance is communicated with all snakelike with second seal groove (14-1) of the second water-bath loop exit, the rising pipe of the second water test tube (6) is arranged on permeable stone (16) place being positioned at below through the second moisturizing pore, and the second water-bath circulation fluid entrance is communicated with a cryostat circulator (2) respectively by a connecting pipe with the second water-bath loop exit.
5. a kind of bilateral frost heave test device for porosint according to claim 2, it is characterized in that: described first temperature control dish (13) is along the circumferential direction processed with two annular grooves, the top of leather sheath (15) is sleeved on the first temperature control dish (13), and the outer cover of each annular groove is equipped with a first resilient seal circle.
6. a kind of bilateral frost heave test device for porosint according to claim 4, it is characterized in that: described second temperature control dish (14) is along the circumferential direction processed with two annular grooves, the bottom of leather sheath (15) is sleeved on the second temperature control dish (14), and the outer cover of each annular groove is equipped with a second resilient seal circle.
7. a kind of bilateral frost heave test device for porosint according to claim 2, it is characterized in that: described each adiabatic ring (17) comprises two semicircle annulus and two web members, two semicircle annulus fasten composition annulus relatively, two intersections of two semicircle annulus are fixed by two web members, one end of each annulus is processed with annular protrusion, the other end of each annulus is processed with the annular groove corresponding with annular protrusion, and adiabatic ring (17) is the adiabatic ring (17) be made up of acryhic material.
8. utilize an a kind of bilateral frost heave test method for porosint described in claim 1,2,3,4,5,6 or 7, it is characterized in that: described method realizes in the steps below:
Step one: by being placed in+2 DEG C together with mould after full for the test porosint (21) after shaping water treatment, health 6h in the climatic chamber of 98% humidity;
Step 2: the gravity direction of multiple temperature sensor along test porosint (21) is buried underground, and be embedded in the side of test porosint (21), distance between adjacent two temperature sensors is 25mm, the depth of burying of each temperature sensor is 15mm, and puts native latex film at the lateral wall of test porosint (21);
Step 3: the upper surface and lower surface of testing porosint (21) are pasted a filter paper respectively, then will test porosint (21) is placed between two permeable stones (16), and by geotechnological latex film, the top of leather sheath (15) and the sealing of the first resilient seal circle are fixed on the first temperature control dish (13), by geotechnological latex film, the bottom of leather sheath (15) and the sealing of the second resilient seal circle are fixed on the second temperature control dish (14), by the first temperature control dish (13), second temperature control dish (14), leather sheath (15) and two permeable stones (16) are arranged in the circular sleeve that multiple adiabatic ring (17) forms,
Step 4: make the arc pit of the arc convex of cylinder (8) seaming chuck (11) and the upper rectangle projection of the first temperature control dish (13) interior and be in critical contact state;
Step 5: respectively data acquisition is carried out to LVDT displacement transducer (18), pressure transducer (19) and temperature sensor by data acquisition unit (20);
Step 6: respectively liquid coolant is packed into two cryostat circulators (2) and the first temperature control dish (13) and the second temperature control dish (14), liquid coolant has loaded rear startup two cryostat circulators (2), respectively temperature control is carried out to the first temperature control dish (13) and the second temperature control dish (14), the temperature of the first temperature control dish (13) is made to control at-2 ° to-35 °, make the second temperature control dish (14) temperature control at-2 ° to-35 °, after the first temperature control dish (13) and the second temperature control dish (14) temperature stabilization, start test;
Step 7: porosint to be tested (21) frost-heaving deformation reaches steady state (SS), can stop experiment;
Step 8: take out the test porosint (21) freezed, according to the interval stratified sampling of 15mm, test the mass water content of each layer position soil sample, and record data, complete test.
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