CN102809641B - Undisturbed soil sample expansion force testing device capable of controlling saturation - Google Patents
Undisturbed soil sample expansion force testing device capable of controlling saturation Download PDFInfo
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- CN102809641B CN102809641B CN201210237803.XA CN201210237803A CN102809641B CN 102809641 B CN102809641 B CN 102809641B CN 201210237803 A CN201210237803 A CN 201210237803A CN 102809641 B CN102809641 B CN 102809641B
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Abstract
The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.
Description
Technical field
The invention belongs to soil sample physical quantity testing apparatus technical field, be specifically related to a kind of undisturbed and can control saturated soil sample bulging force proving installation.
Background technology
Soil test is one of substance of soil mechanics research, and soil test can disclose the distinctive mechanical property of the soil body, can determine various theories and parameters of engineering design, also can verify correctness and the practicality of various theories simultaneously.Therefore, soil test has irreplaceable effect for theoretical research and the engineering application of soil mechanics.
Just because of this importance of soil test comes into one's own the accuracy of soil test.And in soil test, the Accurate Determining of soil sample parameter concerns correctness and the feasibility of theoretical research more.Therefore, the test new equipment of development to soil sample realize fast, the mensuration tool of parameter is of great significance under undisturbed condition, particularly, for the mechanical property of special soils, should study its special mechanical property by special test unit and test method.
Swelled ground is a kind of geologic body with remarkable swell-shrink characteristics forming in nature geological process, and clay composition is mainly comprised of strongly hydrophilic mineral smectite and illite.Swelled ground has overconsolidation, fissurity, the water suction engineering propertiess different from normal consolidation clay such as softening, dehydration shrinkage cracking that significantly expand, and therefore, roadbed and the side slope of building in typical swelled ground distributive province are usually " meet moat to slide, have dike to collapse ".Swelled ground especially has serious destruction to light construction, roadbed, airport, side slope and dykes and dams etc. to buildings, and this destruction often has repeatability and long-term latency.Swelled ground and engineering problem thereof are one of worldwide technological puzzle of up to the present still not properly settling of ground circle, and this series of problems causes by the bulging force of swelled ground.Therefore bulging force, how to measure and evaluate swelled ground just becomes one of key issue of research swelled ground mechanical characteristic.
Bulging force, as the special mechanical property of swelled ground, has important researching value.Bulging force testing experiment method has a lot, common are at present expansion back-pressure method, pressurized expansion method and balance pressurization.
Expansion back-pressure method be instigate soil sample fully absorb water free expansion stable after again load application make it return to initial volume, after allowing soil sample expand into greatest extent in test, successive loading compression, until soil sample is returned to initial volume, at this moment required applied pressure is defined as bulging force.
Pressurized expansion method is first by then immersion expansion of soil sample compression, the soil sample decrement producing under produced swell increment and this pressure of soaking under a certain pressure equates, this pressure is defined as bulging force, in process of the test, by a series of load-swell increment corresponding relation curve, determines bulging force value.
Balance pressurization method refers to that progressively load application is eliminated dilatational strain step by step, maintains soil sample constancy of volume when soil sample water suction starts to produce certain expansion, and the aggregate-value of last load application is bulging force.
Analyze knownly, these bulging force method of testings all have shortcoming in various degree:
1. the pressure that expansion back-pressure method records is for " consolidation pressure " but not " swelling pressure " truly, concrete reason is: the Shi He compression soil body is a kind of consolidation process, the physical process that fixed is the particle generation slippage that forms soil skeleton, fragmentation, restructuring, hole free water is discharged and hole reduces; Expand is that intergranular, intergranular thicken " wedge " in conjunction with moisture film and open the physical chemistry of particle to the process of mechanics.Visible, the power that expansion back-pressure method records is " consolidation pressure " but not " swelling pressure ".Test unit is: test adopts cutting ring and consolidometer to carry out, its operation general procedure is, first use cutting ring that 2cm is high for sample, then cutting ring is connect to height, pack consolidometer into, adjusting dial gauge pointer is zero, add water leave soil sample fully expand stable after, stage loading is until occur that volume is less than the compression deformation of soil sample initial volume.Repairing experiment achievement obtains one " immersion pressuring curve ", and the corresponding pressure of intersection point of this curve and lines of zero distortion is bulging force.Its shortcoming is: the power that the method records is not inconsistent with the physical significance of bulging force for " consolidation pressure " but not " swelling pressure "; The test of maximum swelling power need draw by curve plotting, can not record by testing directly, and inconvenience, can not reflect test actual value.In addition the state of saturation of the uncontrollable soil sample of this test method.
2. pressurized expansion method is when applying maximum one-level load, and the soil body has produced compression deformation, has changed dry density and the original state structure of the soil body, and therefore, trial value and actual value are had any different.Test unit is: test adopts cutting ring and consolidometer to carry out, its operation general procedure is, stable in different load lower compression respectively by a plurality of soil samples in test, adjust dial gauge pointer position (considering instrument deflection), adding water, to appoint soil sample to be expanded to stable, repairing experiment achievement obtains one " the expansivity curves under different loads ", and this curve and the corresponding pressure of lines of zero distortion intersection point are bulging force.Its shortcoming is: in test, first soil sample is compressed, produced soil disturbance, destroyed the microstructure of soil sample; Need indirectly try to achieve bulging force by curve plotting, more directly test bulging force and operate the trouble that seems; In test, need to test by a plurality of soil samples, taken many instruments, affect the turnover of equipment, this test is the state of saturation of uncontrollable soil sample also.
3. balance pressurization method, it is the standard method of < < Standard for test methods of earthworks > > (GB/T 50123-1999), its test result relatively meets the physical significance of bulging force, but in process of the test by Deformation control need repeatedly, load application continually, also can cause to a certain extent the damage and fracture of undisturbed soil body structure.Test unit is: balance pressurization method also needs to use cutting ring and consolidometer carries out test operation.Its process of the test is, pack soil sample into consolidometer, adjusting dial gauge makes pointer to zero or a certain initial reading, can add water and expand by soil sample, when dial gauge reading increases at the beginning, add immediately appropriate loading and make dial gauge maintain initial reading, dial gauge reading again increases loading again and pushes back, so repeatedly make dial gauge maintain all the time initial reading, when the two hours readings of being separated by are constant, can be considered stable, added loading is bulging force.
It should be noted that, although balance pressurization method test bulging force has many advantages, but also there is very large shortcoming in it: first, process of the test trouble, need continuous load application to recover initial position to guarantee dial gauge pointer, and adding how many loads cannot know in advance, this just has higher requirement to the operant level of testing crew; Second, soil sample is from starting continuous imbibition to repeatedly pressurizeing and finally tend towards stability, the test of balance pressurization method cannot be determined the state that soil sample is final exactly, cannot strictly control and determine under loading environments at different levels that whether soil sample state is completely in state of saturation in process of the test; The 3rd, soil sample cannot reach proper state of saturation lacking under the condition of negative pressure vacuumizing; The 4th, due to state of saturation that in test cannot ACTIVE CONTROL soil sample, need to lean on nature immersion fully saturated, therefore must cause the experimental test time long, often do the time that single test just needs a couple of days and even tens days, also do not comprise during this time the failure of test, if need disposable a large amount of bulging force test of doing, just need more personnel, more instrument, spend the more time, uneconomical; The 5th, process of the test trivial operations, needs artificial constantly record data in process of the test; The 6th, this test unit is the state of saturation of uncontrollable soil sample also.
Above test method and equipment respectively have relative merits, the above three kinds of test methods of Comprehensive Correlation, subject matter in bulging force test can be summarized as: first, conventionally bulging force refers to the bulging force recording under the condition of native constancy of volume keeping, and the bulging force that how to guarantee so test in test is in the physical sense in strict conformity with the implication of bulging force; The second, in process of the test, how to guarantee soil structures undisturbed, before and after test, can avoid undisturbed soil sample and structural disturbance and the damage of remoulded sample; The 3rd, for the maximum swelling power of measuring, the saturability of warranty test soil sample how; The 4th, how by ACTIVE CONTROL saturation history, to save the elapsed time of bulging force test; The 5th, how to avoid the shortcomings such as the complicated operation in classic method test, frequent reading.
For the problem and shortage that in the test of conventional expanded power, existing device exists, utilize advanced technology, invention, develop a set of undisturbed, the new equipment that can control few, easy to operate bulging force test saturated, consuming time, for the expansion Research on Mechanical Properties of carrying out swelled ground, significant.
Summary of the invention
The object of this invention is to provide a kind of undisturbed and can control saturated soil sample bulging force proving installation, effectively overcome in the test units such as expansion back-pressure method, pressurized expansion method and balance pressurization large to soil sample structural perturbation, can not effectively control strict state of saturation and test longer problem consuming time.
The technical solution adopted in the present invention is, a kind of undisturbed can be controlled saturated soil sample bulging force proving installation, it is characterized in that, comprise seat support system, in seat support system, be fixed with horizontal direction lower wall, tubular cutting ring seat is installed on lower wall, in tubular cutting ring seat inner side, be coaxially installed with tubular cutting ring, the top of cutting ring seat is provided with upper cover, between cutting ring seat and upper cover, forms enclosure space;
On lower wall and the inner side that is positioned at cutting ring has center circular groove, around center circular groove, have annular groove, in the circular groove of center, be placed with soil pressure case, the bottom of center circular groove has the hole of outwards drawing for the wire of soil pressure case, in annular groove, be placed with annular water permeating board, on annular water permeating board, evenly have a plurality of immersion circular grooves, in each circular groove that soaks, be all placed with permeable stone, the bottom of annular groove is connected with external water flood system by pipeline;
Between lower wall and cutting ring, be placed with soil sample, soil sample, top be placed with permeable panel seat, the bottom of permeable panel seat is inlaid with porous disc, permeable panel seat has the permeable hole communicating with porous disc;
In upper cover, open downwards and be provided with center hole, in center hole, be provided with plunger, the bottom of plunger is against on permeable panel seat, and the top of upper cover is provided with the screw rod of energy up-down adjustment, the bottom of screw rod is against on plunger, is also connected with overflow device and vaccum-pumping equipment in upper cover.
Seat support system comprises movably frame, is fixed with base plate in frame, on base plate, by hex bolts, is provided with for the fixing base of lower wall.
On lower wall, be provided with the outside baffle ring of protruding cutting ring sword pin, cutting ring seat is fixed on the outside of the outside baffle ring of cutting ring sword pin by screw thread, and cutting ring coordinates the inner side that is placed on the outside baffle ring of cutting ring sword pin.
External water flood system comprises the water box support being arranged in upper cover, water box with scale mark is installed on water box support, the upper end of water box communicates with atmosphere, the bottom of water box is communicated with water injection conduit, water injection conduit valve is installed on water injection conduit, and the other end of water injection conduit is connected with the bottom of annular groove by the pagoda joint being arranged on lower wall.
Between cutting ring and lower wall, be provided with rubber cushion ring.
The upper and lower surface of soil sample is all placed with filter paper, is placed with filter paper on porous disc.
The top of upper cover is fixed with two columns, by two columns, is fixed with horizontal direction crossbeam, has tapped through hole straight down on crossbeam, and screw rod is arranged in this tapped through hole.
In upper cover, open downwards and be provided with overflow device joint and vacuumizing joint, on overflow device joint, overflow device is installed, on vacuumizing joint, be connected with vacuum pump conduit, vacuum pump valve is installed on vacuum pump conduit.
The beneficial effect that undisturbed of the present invention can be controlled saturated soil sample bulging force proving installation is: apparatus of the present invention are applicable to the mensuration of soil sample bulging force, is particularly useful for the test of the maximum swelling power of undisturbed unsaturated expansive soils under saturation conditions and remolded expansive soils.Use in mensuration process of the present invention, first, by cutting ring, directly take undisturbed unsaturated expansive soils sample, or produce swelled ground remoulded sample by hitting real pressure-like, under rigid side wall condition, gather bulging force data, keep the constant of soil sample volume, effectively reduced the disturbance to soil sample structure in test process; The second, by vaccum-pumping equipment, the state of saturation of soil sample is carried out to ACTIVE CONTROL, guarantee the state of saturation under stricti jurise condition, thereby effectively reduced the test duration of bulging force; The 3rd, by the soil pressure case collection bulging force data of high precision, microstrain, effectively guaranteed the precision of test; The 4th, due to soil sample diameter and highly all larger, its end restraint effect can reduce greatly, and the friction force that simultaneously also can effectively reduce between cutting ring wall and soil by cutting ring smooth inner wall affects, thereby assurance is positioned over reliability and precision that the soil pressure case of soil sample bottom centre position measures.To sum up, this test unit have to soil sample undisturbed, can ACTIVE CONTROL saturated, test consuming time less, the feature such as simple in structure, easy to operate and data are reliable.
Accompanying drawing explanation
Fig. 1 is the structural representation that undisturbed of the present invention can be controlled saturated soil sample bulging force proving installation;
Fig. 2 is the structural representation of the device upper cover in the present invention;
Fig. 3 is the structural representation of the device lower wall in the present invention;
Wherein, 1. frame; 2. base plate; 3. base; 4. hex bolts; 5. lower wall; 6. cutting ring seat; 7. baffle ring is propped up in cutting ring sword pin outside; 8. soil sample; 9. cutting ring; 10. center circular groove; 11. holes; 12. soil pressure cases; 13. wires; 14. annular water permeating boards; 15. immersion circular grooves; 16. pagoda joints; 17. water injection conduits; 18. water boxes; 19. rubber cushion rings; 20. porous discs; 21. permeable panel seats; 22. permeable holes; 23. plungers; 24. upper covers; 25. overflow device joints; 26. vacuumizing joints; 27. columns; 28. crossbeams; 29. hexagonal nuts; 30. screw rods; 31. first screws; 32. water box supports; 33. second screws; 34. overflow devices; 35. socket head cap screws; 36. vacuum pump conduits; 37. vacuum pump duct valves; 38. water injection conduit valves.
Embodiment
As shown in Figure 1, a kind of undisturbed of the present invention can be controlled saturated soil sample bulging force proving installation, comprises seat support system.Seat support system plays integrated support effect in process of the test.Seat support system comprises movably frame 1, is fixed with base plate 2 in frame 1, on base plate 2, by hex bolts 4, base 3 is installed, base 3 for fixing horizontal to lower wall 5.On lower wall 5, be coaxially installed with tubular cutting ring seat 6 and tubular cutting ring 9, concrete mounting means is: on lower wall 5, be provided with the outside baffle ring 7 of protruding cutting ring sword pin, outside baffle ring 7 of cutting ring sword pin can prevent the turn up generation of phenomenon of cutting ring 9 sword pin that in process of the test, soil sample 8 causes after expanding, both the lateral expansion of swelled ground volume can be prevented, the damage of cutting ring 9 parts can be prevented again.Cutting ring seat 6 is fixed on the outside of the outside baffle ring 7 of cutting ring sword pin by screw thread, cutting ring 9 coordinates the inner side that is placed on the outside baffle ring 7 of cutting ring sword pin, between cutting ring 9 and lower wall 5, is provided with rubber cushion ring 19.Rubber cushion ring 19 can play the effect of sealing in vacuum.The top of cutting ring seat 6 is provided with upper cover 24 by two socket head cap screws 35, between cutting ring seat 6 and upper cover 24, forms enclosure space.
Shown in Fig. 3, in the enclosure space of cutting ring seat 6 and upper cover 24 formation, on the lower wall 5 and inner side that is positioned at cutting ring 9 has center circular groove 10, around center circular groove 10, have annular groove, in center circular groove 10, be placed with soil pressure case 12, the bottom of center circular groove 10 has hole 11, and hole 11 is outwards drawn for the wire 13 for soil pressure case 12.Wire 13 is drawn the outside data acquisition system (DAS) of rear connection by hole 11.Data acquisition system (DAS) is for carrying out data acquisition in process of the test.Annular groove is used for arranging water filling path, is placed with annular water permeating board 14 in annular groove, the upper surface of the annular water permeating board 14 after placing and the upper surface flush of soil pressure case 12.Annular water permeating board 14 circumferentially evenly has three immersion circular grooves 15, to strengthen the homogeneity of soil sample 8 immersion saturated in immersion process.The interior permeable stone that is all placed with of each circular groove 15 that soaks, the bottom of annular groove is connected with external water flood system by pipeline.Between lower wall 5 and cutting ring 9, be placed with soil sample 8.The top of soil sample 8 is placed with permeable panel seat 21, and the bottom of permeable panel seat 21 is inlaid with porous disc 20, the upper surface close contact of the lower surface of porous disc 20 and soil sample 8, and permeable panel seat 21 has two of the left and right permeable hole 22 communicating with porous disc 20.Permeable hole 22 can impel the favourable discharge of porous disc 20 surrounding airs after test water filling.The upper and lower surface of soil sample 8 is all placed with filter paper, on porous disc 20, is placed with filter paper.
Shown in Fig. 2, in upper cover 24, open downwards and be provided with center hole, in center hole, be provided with plunger 23, the bottom of plunger 23 is against on permeable panel seat 21, and the top of upper cover 24 is provided with the screw rod 30 of energy up-down adjustment, and the bottom of screw rod 30 is against on plunger 23.Screw rod 30 can apply certain pressure in advance, fully guaranteed soil sample 8 respectively with the close contact of porous disc 20 and 5 two planes of lower wall, to improve results precision.In upper cover 24, be also connected with overflow device and vaccum-pumping equipment.The top of upper cover 24 is fixed with 27, two columns 27 of two columns and is fixed with horizontal direction crossbeam 28 by two hexagonal nuts 29, has tapped through hole straight down on crossbeam 28, and screw rod 30 is arranged in this tapped through hole.In upper cover 24, open downwards and be provided with overflow device joint 25 and vacuumizing joint 26, overflow device 34 is installed on overflow device joint 25, overflow device 34 adopts organic glass to make.On vacuumizing joint 26, be connected with vacuum pump conduit 36, vacuum pump valve 37 is installed on vacuum pump conduit 36.
External water flood system comprises by two the first screws 31 and is arranged on the water box support 32 in upper cover 24, on water box support 32, by four the second screws 33, the water box 18 with scale mark is installed, the upper end of water box 18 communicates with atmosphere, the bottom of water box 18 is communicated with water injection conduit 17, water injection conduit valve 38 is installed on water injection conduit 17, and the other end of water injection conduit 17 is connected with the bottom of annular groove by the pagoda joint 16 being arranged on lower wall 5.
During test, close the water injection conduit valve 38 of water injection conduit 17, to injected water in water box 18, record the scale mark of the water surface in water box 18 now.Open vacuum pump duct valve 37, open vaccum-pumping equipment.After having vacuumized, close vacuum pump duct valve 37, now by data acquisition system (DAS), data are carried out to first record.Open water injection conduit valve 38, water is flowed out.Water is entered the annular water permeating board 14 in lower wall 5 and is contacted with soil sample 8 by water injection conduit 17, and soil sample 8 starts immersion.When seeing the water surface by overflow device 34, water filling finishes, and closes water injection conduit valve 38, and records the position of water surface scale mark in water box 18 now.After soil sample 8 immersions, start to expand, observe the variation of data in external data acquisition system, after pending data is stable, data are carried out to record for the second time.
Above test operation is applicable to swelled ground undisturbed soil sample and swelled ground remoulded sample, and both differences are only the preparation process of soil sample.Swelled ground undisturbed soil sample is directly with the cutting ring 9 of large rigidity, to take in scene, during test, by the soil sample of cutting native cutter leveling cutting ring 9 two ends, carries out test operation; When swelled ground remoulded sample is sample preparation, first air-dry swelled ground undisturbed soil sample is pulverized, sieves, mixed thoroughly, then by desired moisture content, with sprayer, adding water mixes thoroughly again, after the standing diel of moisturizing, layering is hit real in required density, requires the sample preparation error of water cut and density to be all controlled in 1%.
The present invention is in carrying out soil sample bulging force test process:
1, by using cutting ring 9 to realize, soil sample 8 has been realized to strict control constant volume in rigid side wall, therefore, the bulging force that the present invention carries out experimental test more strictly meets the physical significance of maximum swelling power.
2, to test undisturbed unsaturated expansive soils sample and remolded expansive soils sample, all can test.
3, by the cooperation of screw rod 30 and plunger 23, the precompressed that applies to soil sample 8, fully guaranteed soil sample 8 respectively with the close contact of porous disc 20 and 5 two planes of lower wall.
4, special large diameter cutting ring 9, can directly adopt undisturbed soil sample 8, during test, cutting ring 9 is directly put into proving installation, has reduced sampling and test and has prepared the disturbance to expansion soil sample in two processes.
5, in bulging force test process to test undisturbed unsaturated expansive soils sample and the equal undisturbed of remolded expansive soils sample, can guarantee to be consistent before undisturbed unsaturated expansive soils sample and remolded expansive soils spline structure and test.
6, by vaccum-pumping equipment, guaranteed that expansion soil sample can provide technological means for measuring maximum swelling power finally in complete state of saturation, has effectively reduced the time that test consumes simultaneously.
7, on lower wall 5, have annular water permeating board 14, annular water permeating board 14 circumferentially evenly has a plurality of immersion circular grooves 15, control soil sample 8 immersions that can be stricter in vacuumizing saturation history, saturated homogeneity, fully guaranteed the saturability of whole soil sample 8, made soil sample 8 all the time in strict state of saturation.
8, bulging force reading adopts soil pressure case 12 tests, and signal accurately, efficiently, has reduced the consumption of human and material resources, financial resources and time.
9, soil pressure case 12 is positioned over soil sample 8 bottom centre positions, on the one hand, the friction force that can effectively reduce between cutting ring wall and soil by special cutting ring smooth inner wall when sampling and test affects, on the other hand, due to test soil sample 8 diameters and highly all larger, its end restraint effect also can reduce greatly.
10, instrumentation is easy, and testing crew, without higher technology, experience requirement, and has been guaranteed to the success ratio of test.
Claims (7)
1. a undisturbed can be controlled saturated soil sample bulging force proving installation, it is characterized in that, comprise seat support system, in described seat support system, be fixed with horizontal direction lower wall (5), tubular cutting ring seat (6) is installed on described lower wall (5), in described tubular cutting ring seat (6) inner side, be coaxially installed with tubular cutting ring (9), the top of described cutting ring seat (6) is provided with upper cover (24), between described cutting ring seat (6) and upper cover (24), forms enclosure space;
Described lower wall (5) inner side upper and that be positioned at cutting ring (9) has center circular groove (10), around described center circular groove (10), have annular groove, in described center circular groove (10), be placed with soil pressure case (12), the bottom of described center circular groove (10) has the hole (11) of outwards drawing for the wire (13) of soil pressure case (12), in described annular groove, be placed with annular water permeating board (14), on described annular water permeating board (14), evenly have a plurality of immersion circular grooves (15), in the described circular groove (15) that respectively soaks, be all placed with permeable stone, the bottom of described annular groove is connected with external water flood system by pipeline,
Described external water flood system comprises the water box support (32) being arranged in upper cover (24), water box (18) with scale mark is installed on described water box support (32), the upper end of described water box (18) communicates with atmosphere, the bottom of described water box (18) is communicated with water injection conduit (17), water injection conduit valve (38) is installed on described water injection conduit (17), and the other end of described water injection conduit (17) is connected with the bottom of annular groove by the pagoda joint (16) being arranged on lower wall (5);
Between described lower wall (5) and cutting ring (9), be placed with soil sample (8), the top of described soil sample (8) is placed with permeable panel seat (21), the bottom of described permeable panel seat (21) is inlaid with porous disc (20), and described permeable panel seat (21) has the permeable hole (22) communicating with porous disc (20);
In described upper cover (24), open downwards and be provided with center hole, in described center hole, be provided with plunger (23), the bottom of described plunger (23) is against on permeable panel seat (21), the top of described upper cover (24) is provided with the screw rod (30) of energy up-down adjustment, it is upper that the bottom of described screw rod (30) is against plunger (23), and described upper cover is also connected with overflow device and vaccum-pumping equipment on (24).
2. according to undisturbed claimed in claim 1, can control saturated soil sample bulging force proving installation, it is characterized in that, described seat support system comprises movably frame (1), in described frame (1), be fixed with base plate (2), described base plate (2) is upper to be provided with for the fixing base (3) of lower wall (5) by hex bolts (4).
3. according to undisturbed claimed in claim 1, can control saturated soil sample bulging force proving installation, it is characterized in that, on described lower wall (5), be provided with the outside baffle ring (7) of protruding cutting ring sword pin, described cutting ring seat (6) is fixed on the outside of the outside baffle ring (7) of cutting ring sword pin by screw thread, described cutting ring (9) coordinates the inner side that is placed on the outside baffle ring (7) of cutting ring sword pin.
4. according to undisturbed claimed in claim 1, can control saturated soil sample bulging force proving installation, it is characterized in that, between described cutting ring (9) and lower wall (5), be provided with rubber cushion ring (19).
5. according to undisturbed claimed in claim 1, can control saturated soil sample bulging force proving installation, it is characterized in that, the upper and lower surface of described soil sample (8) is all placed with filter paper, and described porous disc is placed with filter paper on (20).
6. according to undisturbed claimed in claim 1, can control saturated soil sample bulging force proving installation, it is characterized in that, the top of described upper cover (24) is fixed with two columns (27), by described two columns (27), be fixed with horizontal direction crossbeam (28), described crossbeam has tapped through hole straight down on (28), and described screw rod (30) is arranged in this tapped through hole.
7. according to undisturbed claimed in claim 1, can control saturated soil sample bulging force proving installation, it is characterized in that, in described upper cover (24), open downwards and be provided with overflow device joint (25) and vacuumizing joint (26), overflow device (34) is installed on described overflow device joint (25), on described vacuumizing joint (26), be connected with vacuum pump conduit (36), vacuum pump valve (37) is installed on described vacuum pump conduit (36).
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