CN115977173A - Repeatable testing device and testing method for static pile pressing in homogeneous soil - Google Patents
Repeatable testing device and testing method for static pile pressing in homogeneous soil Download PDFInfo
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- CN115977173A CN115977173A CN202211699347.0A CN202211699347A CN115977173A CN 115977173 A CN115977173 A CN 115977173A CN 202211699347 A CN202211699347 A CN 202211699347A CN 115977173 A CN115977173 A CN 115977173A
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- 239000002689 soil Substances 0.000 title claims abstract description 97
- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 230000003068 static effect Effects 0.000 title claims abstract description 41
- 238000003825 pressing Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 79
- 239000010959 steel Substances 0.000 claims abstract description 79
- 239000004576 sand Substances 0.000 claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 46
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 229940099259 vaseline Drugs 0.000 claims description 9
- 238000005056 compaction Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 230000007480 spreading Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005527 soil sampling Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001814 effect on stress Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention provides a repeatable testing device for static pile pressing in homogeneous soil and a testing method thereof, wherein the repeatable testing device for static pile pressing in homogeneous soil comprises a mold box, a mold pile, a rubber base plate, a sand layer, a steel protecting cylinder, a counter-force steel plate, a pressurizing air bag, two pressurizing pipes, two pressure relief pipes, a cylindrical thin-wall long annular cutter, a remolded soil body, remolded soil, a remolded rubber pad and a remolded sand layer; the top cover, the rubber base plate, the reaction steel plate and the pressurizing air bag of the model box are all provided with a plurality of model pile holes; the top cap and the counter-force steel sheet of model case all are equipped with two pressurization pipe holes and two pressure release pipe holes, two pressurization intraductal and being located of pipe insert the pressurization gasbag that corresponds, two pressure release pipes insert the downthehole and being located of pipe that corresponds on the pressurization gasbag. The method is easy to operate, convenient and quick, can repeatedly carry out the static pressure pile test, obviously reduces the influence of the boundary effect on the stress among the piles, and further researches the pile sinking mechanism of the static pressure pile.
Description
Technical Field
The invention belongs to the technical field of pile foundation engineering, and particularly relates to a repeatable testing device and a testing method for static pile pressing in homogeneous soil.
Background
Static pressure pile is a common construction method in pile foundation engineering, i.e. a construction method for using a static pile press to provide pile pressing force and pressing a precast pile into the ground. The static pressure pile has the advantages of no noise, no vibration influence, no environmental pollution, no impact force on the pile and the like during construction, and is widely applied to urban areas with higher construction requirements.
However, the problems of pile body lifting, hole guiding and pile pressing, geological fracture zone crossing and the like often occur in the pile sinking process of the static pressure pile, because the pile body is complex in stress and the theoretical research on the static pressure pile is not comprehensive and deep enough in the static pressure pile sinking process, and further theoretical analysis needs to be carried out on an indoor model test of the static pressure pile. In an indoor large-size test, due to the fact that large-size undisturbed soil is difficult to take out, the undisturbed soil is replaced by common remolded soil, and after pile pressing is carried out in the remolded soil, soil body disturbance and boundary effect can have certain influence on a new round of pile pressing test.
At present, the solution to this problem is: after the primary pile pressing test is finished, remolded soil is manufactured again and then the pile pressing test is carried out, the method is long in time consumption, large in workload and low in test efficiency; or after the pile pressing test is finished once, the pile pressing test is carried out again at a certain distance from the pile, and the method is convenient, simple, time-saving and labor-saving, but the accuracy and the reliability of the test result are influenced by the obvious action of soil body disturbance and boundary effect.
Therefore, the invention provides the repeatable static pile pressing test device and the repeatable static pile pressing test method in the homogeneous soil, which are simple and quick to operate and less affected by the boundary effect.
Disclosure of Invention
The invention aims to provide a repeatable testing device and a testing method for static pile pressing in homogeneous soil, which can obviously reduce the influence of boundary effect on stress between piles.
The invention provides a repeatable test device for static pressure piles in homogeneous soil, which comprises a model box with a top cover, a model pile, a rubber base plate, a sand layer, a steel protective cylinder, a counterforce steel plate, a pressurizing air bag, two pressurizing pipes, two pressure relief pipes, a cylindrical thin-wall long cutting ring, a remolded soil body, remolded soil, a remolded rubber pad and a remolded sand layer, wherein the model box is provided with a top cover; the top cover, the rubber base plate, the reaction steel plate and the pressurizing air bag of the model box are all provided with a plurality of model pile holes; the top cover and the counter-force steel plate of the model box are respectively provided with two pressurizing pipe holes and two pressure relief pipe holes, the two pressurizing pipes are inserted into the corresponding pressurizing pipe holes and are positioned on the pressurizing air bag, and the two pressure relief pipes are inserted into the corresponding pressure relief pipe holes and are positioned on the pressurizing air bag; a sand layer with a certain thickness is paved at the bottom of the model box, and the remolded soil body is manufactured on the sand layer at the bottom of the model box; another sand layer, a rubber base plate, a pressurizing air bag, a counter-force steel plate and a top cover of the model box are sequentially positioned on the remolded soil body; the steel pile casing is positioned in one of the model pile holes, and the model pile is pressed into the model pile hole; the cylindrical thin-wall long ring cutter is inserted between the steel casing and the model pile, the cylindrical thin-wall long ring cutter and the model pile are pulled out, and the filling remolded soil is filled and tamped in the model pile hole in a layered mode; and (3) after the steel casing is drawn out, filling the filling sand layer and the filling rubber pad in sequence, closing the pile hole of the model, pressurizing the pressurizing air bag, solidifying the remolded soil body until the remolded soil body meets the test requirements, and then carrying out a pile sinking test of a next round.
Further, the number of the model pile holes is 5, wherein 1 model pile hole is located in the center, and the other 4 model pile holes are arranged in a square shape.
Further, the model pile hole located in the center is located between the two pressure pipe holes and between the two pressure relief pipe holes respectively, and the two pressure pipe holes are located on the outer sides of the two pressure relief pipe holes.
Further, the top cover of the model box is a rigid steel plate.
Further, the model pile is solid cylindrical concrete, and various test sensors are mounted on the model pile.
Further, the steel casing is a seamless steel pipe.
Furthermore, the reaction steel plate is a box-shaped bottomless guard plate formed by welding steel plates.
Further, the pressurizing air bag is made of high-strength rubber.
Further, the pressurizing pipe and the pressure relief pipe are high-strength rubber hoses.
The invention also provides a testing method of the repeatable testing device for the static pile in the homogeneous soil, which comprises the following steps:
s1: spreading a sand layer with a certain thickness at the bottom of the model box; then, manufacturing a remolded soil body on the sand layer; then sequentially covering a sand layer, a rubber base plate, a pressurizing air bag and a counterforce steel plate on the remolded soil body; finally, installing a top cover of the model box;
s2: vertically inserting a steel pile casing into one of the model pile holes to the layer bottom of the upper sand layer; then grabbing a sand layer in the steel casing and avoiding disturbing to remold a soil body; coating vaseline on the inner wall of the steel casing, and then inserting the model pile into the steel casing until the pile end contacts the surface layer of the remolded soil body; finally, after connecting the control equipment and the pressurizing equipment, pressing the pile into the soil;
s3: coating vaseline on the outer wall of the cylindrical thin-wall long ring cutter, vertically pressing the cylindrical thin-wall long ring cutter into the space between the model pile and the steel casing and pressing the cylindrical thin-wall long ring cutter to a depth deeper than the lower end of the model pile, then vertically drawing out the cylindrical thin-wall long ring cutter, and simultaneously taking out the model pile in the remolded soil body by using the friction force between the cylindrical thin-wall long ring cutter and the model pile;
s4: filling and compacting remolded soil in layers in the model pile hole to the height of the original remolded soil body; then filling a filling sand layer and a filling rubber pad in sequence; then drawing out the steel casing, closing a cover plate of a model pile hole on a top cover of the model box, pressurizing the pressure air bag to the pressure required by the test, solidifying and remolding the soil body and simulating the weight of the upper soil layer;
s5: and (3) coating vaseline on the inner wall and the outer wall of the steel pile casing, inserting the steel pile casing into the next model pile hole, repeating the steps from S2 to S4, simulating different upper soil weights by controlling the pressure of the pressurizing air bag, superposing the test data of multiple pile sinking, and simulating the pressing-in process of the whole pile.
The method is easy to operate, convenient and quick, can repeatedly carry out the static pressure pile test, obviously reduces the influence of the boundary effect on the stress among the piles, and further researches the pile sinking mechanism of the static pressure pile.
Drawings
FIG. 1 is a cross-sectional view of a mold box of a repeatable testing apparatus for static compaction in homogeneous soil during compaction according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a mold box after pressing a long cutting ring into the device for testing repeatability of static compression piles in homogeneous soil according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of a post-pile-picking mold box of a repeatable testing apparatus for static compaction piles in homogeneous soil according to an embodiment of the invention;
FIG. 4 is a cross-sectional view of the mold box after filling remolded soil of the repeatable testing apparatus for static compaction piles in homogeneous soil according to the embodiment of the invention;
FIG. 5 is a cross-sectional view of a pressurized consolidation model box of a repeatable testing apparatus for static compaction piles in homogeneous soil according to an embodiment of the present invention;
fig. 6 is a top view of a mold box of a repeatable testing apparatus for static compaction piles in homogeneous soil according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a repeatable testing device for static pile compaction in homogeneous soil, which comprises a model box 1, a model pile 2, a rubber base plate 3, a sand layer 4, a steel pile casing 5, a reaction steel plate 6, a pressurizing air bag 7, two pressurizing pipes 8, two pressure relief pipes 9, a cylindrical thin-wall long cutting ring 10, a remolded soil body 11, remolded soil 12, a remolded rubber pad 13 and a remolded sand layer 14 as shown in figures 1 to 6.
The model box 1 is formed by welding steel plates, can be square or cylindrical, and has the size determined according to the test requirement.
The mold box 1 is a hollow cube welded by 5mm thick steel plates, and has dimensions of 2000mm × 2000mm × 2000mm.
The top cover of the model box 1 is a rigid steel plate, a reserved pressurizing pipe hole 81, a reserved pressure relief pipe hole 91 and a plurality of model pile holes 15 are arranged on the top cover of the model box 1, an independent cover plate (not shown) is arranged on each model pile hole 15 to control the opening and closing of each model pile hole 15, the distance between every two adjacent model pile holes 15 can meet the test requirement, and the hole site diameters of the pressurizing pipe hole 81, the pressure relief pipe hole 91 and the model pile holes 15 are slightly larger than the pipe diameter or the pile diameter.
The model pile holes 15 are reserved empty hole holes for pile sinking of each model pile, and the number of the model pile holes is five, wherein the diameters of 5 model pile holes 15 are all 80mm, and the diameters of the model pile holes are slightly larger than the pile diameter of the model pile 2; 1 model stake hole 15 is located the center, and the interval 1200mm between other 4 model stake holes 15, and other 4 model stake holes 15 are the square and arrange.
The material of the model pile 2 depends on the test requirements. The model pile 2 is solid cylindrical concrete, the diameter of the model pile is 60mm, the length of the model pile is 1000mm, and various test sensors are mounted on the model pile.
The rubber base plate 3 is made of rubber, the length and the width of the rubber base plate are slightly smaller than those of the soil sampling model box 1, and the thickness of the rubber base plate is 5mm;
the size of the rubber cushion plate 3 is 1900mm multiplied by 1900mm, the thickness of the rubber cushion plate is 5mm, a profiled pile hole 15 is reserved in the center of the rubber cushion plate 3, and the diameter of the profiled pile hole 15 is 80mm.
The sand layer 4 is a homogeneous sand layer for soil consolidation drainage, and the thickness of the sand layer is 30-50 mm;
the steel casing 5 is a seamless steel pipe with the pipe wall thickness of 3 mm-5 mm, the inner diameter is slightly larger than the diameter of the model pile 2, the height is slightly larger than the thickness of the air bag 7, the inner diameter of the steel casing 5 is 70mm, and the height is 230mm; the steel casing 5 prevents the pressurizing air bag 7 from exerting acting force on the model pile 2 to influence the stress of the pile body.
The counterforce steel plate 6 is a box-shaped bottomless guard plate formed by welding 5mm thick steel plates, the length and width of the counterforce steel plate are slightly smaller than those of the soil taking model box 1, and the size of the counterforce steel plate is 1900mm multiplied by 200mm; the height of the pressurizing air bag is equal to the thickness of the pressurizing air bag 7, so that the displacement and the force application direction of the pressurizing air bag 7 are limited, and the pressurizing air bag 7 applies vertical pressure to the original soil in the soil sampling model box 1; the reaction steel plate 6 is also provided with a pile hole 15, a pressure pipe hole 81, and a pressure relief pipe hole 91, which have the same dimensions as those of the top cover of the mold box.
The pressurizing air bag 7 is made of high-strength rubber, the length and width of the pressurizing air bag are slightly smaller than the reaction steel plate 6, and the size of the pressurizing air bag is 1900mm multiplied by 200mm; the thickness is not less than 200mm; the pressurizing pipe 8 and the pressure relief pipe 9 are both positioned on the pressurizing air bag 7; the inside of the pressurizing air bag 7 is provided with a model pile hole 15 with the same position and size as those of the reaction steel plate 6; the pressurizing air bag 7 has higher deformation performance, the air bag wall expands when pressurizing, and the model pile hole 15 is closed; when the pressure is released, the pile hole 15 of the air bag wall shrinkage model is opened, and different upper soil weights can be simulated by controlling the air pressure in the pressurizing air bag 7.
The pressure pipe 8 and the pressure relief pipe 9 are high-strength rubber hoses with the diameter of 30mm; the pressure pipe hole 81 and the pressure relief pipe hole 91 are both positioned on a connecting line of the middle points of the opposite sides, the edge distance of the pressure pipe position is 500mm, and the edge distance of the pressure relief pipe position is 800mm.
The cylindrical thin-wall long cutting ring 10 is a seamless steel pipe with the wall thickness of 3-5 mm, the lower end of the cylindrical thin-wall long cutting ring is edged so as to be pressed in conveniently, the inner diameter of the cylindrical thin-wall long cutting ring is slightly larger than the diameter of the model pile 2, the outer diameter of the cylindrical thin-wall long cutting ring is slightly smaller than the inner diameter of the steel casing 5, and the length of the cylindrical thin-wall long cutting ring is slightly larger than the pile length of the model pile 2; the inner diameter of the cylindrical thin-wall long cutting ring 10 is 64mm, and the length is 1050mm.
The remolded soil body 11 is remolded soil made in a laboratory and is arranged in the model box 1.
The filling remolded soil 12 is the same as that used for the remolded soil 11 and is used for filling the pile hole 15.
The filling rubber pad 13 is a circular rubber pad, and the material and the thickness of the filling rubber pad are the same as those of the rubber cushion plate 3; the thickness of the filling rubber pad 13 is 5mm, and the diameter of the filling rubber pad 13 is 80mm; the diameter is the same as the profile hole 15.
The same sand is adopted for the replenishing sand layer 14 and the sand layer 4, and the thicknesses of the sand and the sand are the same and are used for filling the gap of the sand layer 4 at the pile position; the thickness of the replenishing sand layer 14 is 50mm;
in fact, the top cover of the model box 1, the rubber pad plate 3, the reaction steel plate 6 and the pressurizing air bag 7 are all provided with 5 model pile holes 15, wherein 1 model pile hole 15 is positioned in the center, and the rest 4 model pile holes 15 are arranged in a square shape.
The top cover of the model box 1 and the reaction steel plate 6 are both provided with two pressure pipe holes 81 and two pressure relief pipe holes 91, the model pile hole 15 positioned in the center is respectively positioned between the two pressure pipe holes 81 and between the two pressure relief pipe holes 91, and the two pressure pipe holes 81 are positioned outside the two pressure relief pipe holes 91.
After the model pile 2 is pressed into the model pile hole 15 through loading equipment (not shown), the cylindrical thin-wall long ring cutter 10 is inserted between the steel pile casing 5 and the model pile 2, the cylindrical thin-wall long ring cutter 10 and the model pile 2 are pulled out, and remolded soil 12 is filled and tamped in the model pile hole 15 in a layered mode; and (3) after the steel casing 5 is drawn out, filling a replenishing sand layer 14 and a replenishing rubber pad 13 in sequence, closing a model pile hole 15 of a top cover of the model box, pressurizing and solidifying the soil body 11 by the pressurizing air bag 7 until the soil body meets the test requirements, and then carrying out a pile sinking test of a next round.
The invention also discloses a testing method of the repeatable testing device for the static pile in the homogeneous soil, which comprises the following steps:
s1: a sand layer 4 with a certain thickness is paved at the bottom of the model box 1; then, a remolded soil body 11 is manufactured on the sand layer 4; then, covering another sand layer 4, a rubber base plate 3, a pressurizing air bag 7 and a reaction steel plate 6 on the remolded soil body 11 in sequence; finally, installing a top cover of the model box 1;
s2: vertically inserting a steel pile casing 5 into one of the model pile holes 15 to the bottom of the upper sand layer 4; then slowly grabbing the sand layer in the steel casing 5 by using a tool to avoid disturbing and remolding the soil body 11; coating vaseline on the inner wall of the steel casing 5, and then inserting the model pile 2 into the steel casing 5 until the pile end contacts the surface layer of the remolded soil body 11; finally, after connecting the control equipment and the pressurizing equipment, pressing the pile into soil;
s3: the method comprises the following steps of coating vaseline on the outer wall of a cylindrical thin-wall long ring cutter 10, slowly and vertically pressing the cylindrical thin-wall long ring cutter 10 between a model pile 2 and a steel casing 5 to a depth deeper than the lower end of the model pile 2, then slowly and vertically drawing out the cylindrical thin-wall long ring cutter 10, and simultaneously taking out the model pile 2 in a remolded soil body 11 by utilizing the friction force between the cylindrical thin-wall long ring cutter 10 and the model pile 2;
s4: filling and compacting the remolded soil 12 in the model pile hole 15 layer by layer to the height of the original remolded soil body 11; then filling a filling sand layer 14 and a filling rubber pad 13 in sequence; then the steel casing 5 is drawn out, a cover plate of a model pile hole 15 on a top cover of the model box 1 is closed, the pressurizing air bag 7 is pressurized to the pressure required by the test, and the soil body 11 is solidified and remolded and the upper soil weight is simulated;
s5: and (3) coating vaseline on the inner wall and the outer wall of the steel pile casing 5, inserting the steel pile casing into the next model pile hole 15, repeating the steps from S2 to S4, simulating different upper soil weights by controlling the pressure of the pressurizing air bag 7, superposing the test data of multiple pile sinking, and simulating the pressing-in process of the whole pile.
The method is easy to operate, convenient and quick, can repeatedly carry out the static pressure pile test, obviously reduces the influence of the boundary effect on the stress among the piles, and further researches the pile sinking mechanism of the static pressure pile.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (10)
1. A repeatable testing device for static pile pressing in homogeneous soil is characterized by comprising a model box with a top cover, a model pile, a rubber base plate, a sand layer, a steel protective cylinder, a counter-force steel plate, a pressing air bag, two pressing pipes, two pressure relief pipes, a cylindrical thin-wall long annular cutter, a remolded soil body, remolded soil, a remolded rubber pad and a remolded sand layer; the top cover, the rubber base plate, the reaction steel plate and the pressurizing air bag of the model box are all provided with a plurality of model pile holes; the top cover and the counter-force steel plate of the model box are respectively provided with two pressurizing pipe holes and two pressure relief pipe holes, the two pressurizing pipes are inserted into the corresponding pressurizing pipe holes and are positioned on the pressurizing air bag, and the two pressure relief pipes are inserted into the corresponding pressure relief pipe holes and are positioned on the pressurizing air bag; a sand layer with a certain thickness is paved at the bottom of the model box, and the remolded soil body is manufactured on the sand layer at the bottom of the model box; the other sand layer, the rubber base plate, the pressurizing air bag, the reaction steel plate and the top cover of the model box are sequentially positioned on the remolded soil body; the steel pile casing is positioned in one of the model pile holes, and the model pile is pressed into the model pile hole; the cylindrical thin-wall long ring cutter is inserted between the steel casing and the model pile, the cylindrical thin-wall long ring cutter and the model pile are pulled out, and the filling remolded soil is filled and tamped in the model pile hole in a layered mode; and (3) after the steel casing is drawn out, filling the filling sand layer and the filling rubber pad in sequence, closing the pile hole of the model, pressurizing the pressurizing air bag, solidifying the remolded soil body until the remolded soil body meets the test requirements, and then carrying out a pile sinking test of a next round.
2. A repeatable test apparatus for static compaction piles in homogeneous soil according to claim 1, wherein the number of the model pile holes is 5, 1 of the model pile holes is located at the center, and the remaining 4 model pile holes are arranged in a square.
3. A repeatable test apparatus for a static press-pile in homogenous soil according to claim 2 wherein the central dummy pile hole is located between two pressure tube holes and between two pressure tube holes, and the two pressure tube holes are located outside the two pressure tube holes.
4. A repeatable testing apparatus for a static pile in homogenous soil according to claim 1 wherein the top cover of the mould box is a rigid steel plate.
5. A repeatable test apparatus for a static pressure pile in homogeneous soil according to claim 1, wherein the model pile is solid cylindrical concrete on which a plurality of test sensors are mounted.
6. A repeatable testing apparatus for a static compression pile in homogeneous soil according to claim 1, wherein said steel casing is a seamless steel pipe.
7. The repeatable testing device for the static compression pile in the homogeneous soil as claimed in claim 1, wherein the counterforce steel plate is a box-shaped bottomless guard plate formed by welding steel plates.
8. A repeatable testing apparatus for static pressure piles in homogeneous soil according to claim 1, wherein said pressurizing air bag is made of high-strength rubber.
9. A repeatable testing apparatus for a static pressure pile in homogeneous soil according to claim 1, wherein the pressurizing pipe and the pressure relief pipe are high-strength rubber hoses.
10. A testing method of a repeatable testing device for static pile pressing in homogeneous soil is characterized by comprising the following steps:
s1: spreading a sand layer with a certain thickness at the bottom of the model box; then, manufacturing a remolded soil body on the sand layer; then, covering another sand layer, a rubber base plate, a pressurizing air bag and a counterforce steel plate on the remolded soil body in sequence; finally, installing a top cover of the model box;
s2: vertically inserting a steel pile casing into one of the model pile holes to the bottom of the upper sand layer; then grabbing a sand layer in the steel casing and avoiding disturbing to remold a soil body; coating vaseline on the inner wall of the steel casing, and then inserting the model pile into the steel casing until the pile end contacts the surface layer of the remolded soil body; finally, after connecting the control equipment and the pressurizing equipment, pressing the pile into the soil;
s3: coating vaseline on the outer wall of the cylindrical thin-wall long ring cutter, vertically pressing the cylindrical thin-wall long ring cutter between the model pile and the steel casing to a position deeper than the lower end of the model pile, then vertically drawing out the cylindrical thin-wall long ring cutter, and simultaneously taking out the model pile in the remolded soil body by using the friction force between the cylindrical thin-wall long ring cutter and the model pile;
s4: filling and compacting remolded soil in layers in the model pile hole to the height of the original remolded soil body; then filling a filling sand layer and a filling rubber pad in sequence; then the steel casing is drawn out, a cover plate of a model pile hole on a top cover of the model box is closed, a pressurizing air bag is pressurized to the pressure required by the test, and the soil body is solidified and remolded and the upper soil weight is simulated;
s5: and (3) coating vaseline on the inner wall and the outer wall of the steel pile casing, inserting the steel pile casing into the next model pile hole, repeating the steps from S2 to S4, simulating different upper soil weights by controlling the pressure of the pressurizing air bag, superposing the test data of multiple pile sinking, and simulating the pressing-in process of the whole pile.
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