CN104089826B - The test device of soil body compression modulus and intensity and method of testing thereof in deep hole - Google Patents

The test device of soil body compression modulus and intensity and method of testing thereof in deep hole Download PDF

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Publication number
CN104089826B
CN104089826B CN201410365884.0A CN201410365884A CN104089826B CN 104089826 B CN104089826 B CN 104089826B CN 201410365884 A CN201410365884 A CN 201410365884A CN 104089826 B CN104089826 B CN 104089826B
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hydraulic
test
air pressure
heart pipe
load plate
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CN104089826A (en
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于基宁
高志伟
王向阳
李响
舒磊
孙良鑫
辛文栋
葛建军
王应铭
张宗棠
郭刚
张然
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China Railway First Survey and Design Institute Group Ltd
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  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The present invention relates to soil body compression modulus and the test device of intensity and method of testing thereof in a kind of deep hole.Evaluation engineering ground state is payload oscillation the most reliably, but at present without the device of apertures internal load plate test.Support ring outside support ring, is mounted in the gripper shoe outside lower heart pipe by the present invention by hydraulic rubber Membrane cover, is then connected to jack and pressure sensor lower heart pipe top, be fixed in support ring by displacement transducer;Being contained in by air pressure Rubber membrane cover sets one's heart outside pipe, then fixes upper and lower cover plates;Arrange test system, open pulsometer, hydraulic pump record pressure sensor and the measured value of displacement transducer.Air pressure friction counterforce device, charger and test device are formed a separate wells internal load plate pilot system by the present invention, system provides reaction of bearing to support with hole wall friction for system by air pressure film, the settling amount of load plate directly measured by test sensor, it is achieved that the test of hole internal load plate test.

Description

The test device of soil body compression modulus and intensity and method of testing thereof in deep hole
Technical field
The invention belongs to rock-soil engineering in-situ technical field of measurement and test, be specifically related to soil body compression modulus in a kind of deep hole And the test device of intensity and method of testing thereof.
Background technology
The soil body in nature is affected by its cause condition, climatic environment etc. and causes the thousand of its physico-mechanical properties to differ from ten thousand Not, obtaining soil body physical and mechanical parameter accurately and be not only the important content of engineering investigation, the most also direct relation engineering and is set The security of meter and reasonability.In engineering, conventional geotechnique's laboratory test achievement is as design considerations, but the soil body is as a kind of allusion quotation Type three-phase particle prose style free from parallelism deposit, disturbance during sampling, boundary condition change, transportation, dimensional effect etc. are all to test knot Fruit has certain impact, so carrying out in-situ test in test site is to obtain accurate soil body physical and mechanical parameter relatively preferably side Method.
Evaluation engineering ground state test method the most reliably is i.e. payload oscillation, and internal load plate test in hole is permissible The modulus of compressibility of layered queuing networks ground and bearing capacity feature, the design of engineering is analyzed significant by its result.But mesh Before not apertures internal load plate pilot system and method, typically by put into after hand excavation's pore-forming after major diameter load plate Aperture preloading, uses transmission rod to provide counter-force to load plate at the bottom of hole, and displacement bar is in load plate displacement at the bottom of the measured hole of earth's surface, longer For micron-sized test accuracy, transmission rod and displacement bar require that impact is relatively big, and manually digging hole risk is big, the degree of depth is little, cost High, the cycle is long, only has less application in important Metro Design project prospecting.
Summary of the invention
It is an object of the invention to provide soil body compression modulus and the test device of intensity and test thereof in a kind of deep hole Method, tests accurately to deep foundation base.
The technical solution adopted in the present invention is:
The test device of soil body compression modulus and intensity in deep hole, it is characterised in that:
Including air pressure counter force system, hydraulic load plate system and test system;
Air pressure counter force system is provided with columnar sets one's heart pipe, sets one's heart pipe exterior ring cap air pressure rubber membrane;Set one's heart the top of pipe The mode of being threaded connection is fixed with upper cover plate, and upper cover plate top is provided with suspension ring;The bottom setting one's heart pipe is welded with lower cover Plate;
Hydraulic load plate system is provided with columnar lower heart pipe;Lower heart pipe top is threaded connection mode and is fixed with pressure Force snesor, pressure sensor end face is welded with jack, and jack is connected with setting one's heart pipe by ring flange;Lower heart pipe Outer ring, bottom is welded with the gripper shoe of annular horizontal, and gripper shoe is provided above support ring;Support ring inner ring passes through roller bearing Being fixed on lower heart pipe outer wall, outer ring is fixed with the hydraulic rubber film of the ring-band shape that heart pipe is arranged under ring, sets between inner ring and outer ring It is equipped with radial rib, is placed in gripper shoe;Lower heart pipe bottom is welded with load plate;
Test system includes hydraulic pump, hydraulic tube, pulsometer, pneumatic tube, tester, p-wire and displacement sensing Device;Hydraulic tube picks out from hydraulic pump, and the other end accesses hydraulic rubber film;Pneumatic tube picks out from pulsometer, and the other end accesses air pressure Rubber membrane;P-wire picks out from tester, and the other end accesses the displacement transducer arranged in support ring.
Hydraulic rubber film control valve it is provided with on hydraulic tube.
It is provided with branch on hydraulic tube, accesses jack, branch is provided with jack control valve.
Bed course it is provided with bottom load plate.
Hydraulic tube, pneumatic tube and p-wire both pass through sets one's heart pipe.
Suspension ring are connected with hanging device by lifting wirerope.
Soil body compression modulus and the method for testing of intensity in deep hole, it is characterised in that:
Realized by following steps:
Step one: the construction of boring:
Utilizing hanging device and machinery Luoyang Spade shovel head at position, testing site pore-forming, bore diameter is that load plate diameter adds 100mm;
Drill bit clear hole are proposed, then toward pouring the leveling of 10cm thickness medium coarse sand at the bottom of hole into after being bored into the test degree of depth;
Step 2: test device assembles:
Assemble hydraulic load plate system, by hydraulic rubber Membrane cover in support ring outer end, and support ring is mounted on lower heart pipe In outer gripper shoe, then jack and pressure sensor are connected to lower heart pipe top, displacement transducer is fixed on support On ring;
Fix fork at drilling orifice, with hanging device, the hydraulic load plate system assembled is placed on fork;
Assemble air pressure counter force system, first air pressure Rubber membrane cover is contained in and sets one's heart outside pipe, then upper cover plate is tightened in On heart pipe, lower cover is welded in and sets one's heart pipe low side;
With hanging device by air pressure counter force system lifting to the hydraulic load plate system of drilling orifice, with bolt by flange Fork is taken down after dish fastening;
Arranging test system: hydraulic tube picks out from hydraulic pump, the other end accesses hydraulic rubber film;P-wire is from tester Pick out, other end access digit displacement sensor;Pneumatic tube picks out from pulsometer, and the other end accesses air pressure rubber membrane;
Step 3: test:
After the hydraulic load plate system assembled and air pressure counter force system are slowly put at the bottom of hole, unclamp lifting wirerope, open Open pulsometer to supply gas to air pressure rubber membrane, maintain 30kpa air pressure after 15 minutes, open the gas bleeder valve of pulsometer by air pressure rubber membrane Interior gas pressure is decreased to 5kpa;
Read pressure sensor initial value, open pulsometer and air pressure rubber membrane internal gas pressure added to 30kpa, open hydraulic pump and Jack control valve, slowly pressure sensor force value, steady pressure when pressure sensor pressure reaches 20kpa are read in pressurization;
Open hydraulic rubber film control valve, maintain pressure 30kpa in hydraulic rubber film, close hydraulic rubber film control valve, Read displacement transducer initial value;
Finder charge is divided 8 grades, pressurizes step by step with jack, next stage pressure could be entered after every stage pressure is stable, pressure Power stability criterion is that intrinsic displacement sensor record load plate sedimentation in 60 minutes is less than 0.1mm, and every grade of pressurization is once remembered for latter 10 minutes Record pressure sensor and the measured value of displacement transducer.
The invention have the advantages that
Air pressure friction counterforce device, charger and test device are formed a separate wells internal load plate test by the present invention System, system provides reaction of bearing to support with hole wall friction for system by air pressure film, and load plate directly measured by test sensor Settling amount, both there is no complicated heap support method, the longest press rods and displacement bar, it is achieved that hole internal load plate test Automatic test.The present invention is the most safe and reliable compared with conventional test methods, test data are more accurate, and achieves deep Payload oscillation in hole, tests the depth limit that will no longer be put to the test to a certain extent, and the quickest, experimentation cost is the most relatively Low.Utilize the present invention can carry out the deep hole payload oscillation of engineering foundation under conditions of less cost, at phase of exploration be The parameter such as the bearing capacity of layer position each to the ground soil body, modulus of compressibility can carry out in-situ test, substitute laboratory test with test result Achievement is designed, and has actual loading deformation behaviour and the analysis project ground more accurately of more accurate description foundation soil Stability and the advantage of settlement amount after construction.
Accompanying drawing explanation
Fig. 1 is present configuration figure.
In figure, 1-hanging device, 2-holes, and 3-pneumatic tube, 4-suspension ring, 5-upper cover plate, 6-air pressure rubber membrane, 7-sets one's heart Pipe, 8-p-wire, 9-ring flange, 10-jack, 11-pressure sensor, heart pipe under 12-, 13-roller bearing, 14-support ring, 15-hydraulic rubber film, 16-bed course, 17-hydraulic pump, 18-tester, 19-pulsometer, 20-lower cover, 21-hydraulic tube, 22- Jack control valve, 23-gripper shoe, 24-hydraulic rubber film control valve, 25-displacement transducer, 26-load plate, 27-fork.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
The test device of soil body compression modulus and intensity in deep hole involved in the present invention, including air pressure counter-force system System, hydraulic load plate system and test system:
Air pressure counter force system is provided with columnar sets one's heart pipe 7, sets one's heart pipe 7 exterior ring cap air pressure rubber membrane 6;Set one's heart pipe 7 Top is threaded connection mode and is fixed with upper cover plate 5, and upper cover plate 5 top is provided with suspension ring 4;The bottom welding setting one's heart pipe 7 is solid Surely there is lower cover 20.
Hydraulic load plate system is provided with columnar lower heart pipe 12;Lower heart pipe 12 top is threaded connection mode and fixes Having pressure sensor 11, pressure sensor 11 end face to be welded with jack 10, jack 10 passes through ring flange 9 and sets one's heart pipe 7 are connected;Outer ring, lower heart pipe 12 bottom is welded with the gripper shoe 23 of annular horizontal, and gripper shoe 23 is provided above support ring 14; Support ring 14 inner ring is fixed on lower heart pipe 12 outer wall by roller bearing, and outer ring is fixed with the ring-band shape that under ring, heart pipe 12 is arranged Hydraulic rubber film 15, is provided with radial rib between inner ring and outer ring, be placed in gripper shoe 23;Lower heart pipe 12 bottom is welded It is fixed with load plate 26.
Test system includes hydraulic pump 17, hydraulic tube 21, pulsometer 19, pneumatic tube 3, tester 18, p-wire 8 and Displacement transducer 25;Hydraulic tube 21 picks out from hydraulic pump 17, and the other end accesses hydraulic rubber film 15;Pneumatic tube 3 is from pulsometer 19 Picking out, the other end accesses air pressure rubber membrane 6;P-wire 8 picks out from tester 18, and the other end accesses setting in support ring 14 Displacement transducer 25.
Hydraulic rubber film control valve 24 it is provided with on hydraulic tube 21.It is provided with branch on hydraulic tube 21, accesses jack 10, Jack control valve 22 it is provided with in branch.Bed course 16 it is provided with bottom load plate 26.Hydraulic tube 21, pneumatic tube 3 and p-wire 8 Both pass through and set one's heart pipe 7.Suspension ring 4 are connected with hanging device 1 by lifting wirerope.
The said equipment is utilized to carry out soil body compression modulus and the method for strength test in deep hole, real by following steps Existing:
Step one: the construction of boring 2:
Hanging device 1 and machinery Luoyang Spade shovel head is utilized to add at position, testing site pore-forming, boring 2 a diameter of load plate 26 diameters 100mm;
Drill bit clear hole are proposed, then toward pouring the leveling of 10cm thickness medium coarse sand at the bottom of hole into after being bored into the test degree of depth.
Step 2: test device assembles:
Assemble hydraulic load plate system, hydraulic rubber film 15 is enclosed within support ring 14 outer end, and support ring 14 is mounted on In gripper shoe 23 outside lower heart pipe 12, then jack 10 and pressure sensor 11 are connected to lower heart pipe 12 top, by displacement Sensor 25 is fixed in support ring 14;
Fix fork 27 in boring 2 apertures, with hanging device 1, the hydraulic load plate system assembled is placed on fork 27 On;Fork 27 is assembled by two semicircular ring, and edge is provided with prominent attachment strap and is placed in orifice edge.
Assemble air pressure counter force system, first air pressure rubber membrane 6 is sleeved on and sets one's heart outside pipe 7, then upper cover plate 5 is tightened in Set one's heart on pipe 7;
With hanging device 1 by the hydraulic load plate system of air pressure counter force system lifting to boring 2 apertures, with bolt by method Fork 27 is taken down after blue dish 9 fastening;
Arranging test system: hydraulic tube 21 picks out from hydraulic pump 17, the other end accesses hydraulic rubber film 15;P-wire 8 from Tester 18 picks out, other end access digit displacement sensor 25;Pneumatic tube 3 picks out from pulsometer 19, and the other end accesses air pressure rubber Glued membrane 6.
Step 3: test:
After the hydraulic load plate system assembled and air pressure counter force system are slowly put at the bottom of hole by 1, unclamp lifting wirerope, open Open pulsometer 19 to supply gas to air pressure rubber membrane 6, maintain 30kpa air pressure after 15 minutes, open the gas bleeder valve of pulsometer 19 by air pressure Gas pressure in rubber membrane 6 is decreased to 5kpa;
Read pressure sensor 11 initial value, open pulsometer 19 and air pressure rubber membrane 6 internal gas pressure is added to 30kpa, open liquid Press pump 17 and jack control valve 22, slowly pressure sensor 11 force value is read in pressurization, and pressure sensor 11 pressure reaches 20kpa Time steady pressure;
Open hydraulic rubber film control valve 24, maintain pressure 30kpa in hydraulic rubber film 15, close hydraulic rubber film and control Valve 24, reads displacement transducer 25 initial value;
Finder charge is divided 8 grades, pressurizes step by step with jack 10, after every stage pressure is stable, next stage pressure could be entered, Pressure stability standard is that 60 minutes intrinsic displacement sensors 25 record load plate sedimentation less than 0.1mm, and every grade is pressurizeed latter 10 minutes one Secondary record pressure sensor 11 and the measured value of displacement transducer 25.
After having tested, first shed pressure in jack 10, then shed the pressure in hydraulic rubber film 15, steel will be lifted The pressure in air pressure rubber membrane 6 is shed again, by the inverse process dismounting testing equipment installed after cable tensioning.After taking out testing equipment, Can continue to hole to next and test stratum, be again loaded into testing equipment and start test.
Data process:
Force value and sedimentation value according to surveying record draw P-S, s-t curve, thus obtain holding of this layer of position foundation soil Load power characteristic value and compression modulus.
Take on P-S curve the payload values corresponding to the proportional limit as soil body load test intensity level, count according to corporal Calculation compression modulus:
Wherein, λ is test parameters, takes 0.4-0.45;
P is test pressure;
D is load plate diameter;
S is test settling amount.
Foundation soil deep hole payload oscillation can obtain the original position soil body on the basis of keeping foundation soil boundary condition as far as possible Physical and mechanical parameter, designs for foundation engineering and studies significant.
Test method of the present invention utilizes air pressure rubber membrane 6 to produce frictional force with borehole wall after certain pressure effect expands As the reaction of bearing for payload oscillation, after utilizing hydraulic rubber film 15 to expand under certain pressure effect fixing with hole wall from And be that system provides a stable displacement monitoring standard point.When jack 10 works, top withstands on the air pressure being fixed on hole wall On counter force system, thus produce downward test requirements document pressure and directly act on and load plate 26, active force transmission distance end, it is ensured that The stability of system work.Support ring 14 is tightly secured on hole wall after expanding by hydraulic rubber film 15, support ring during test 14 is independent static with system holding, and displacement transducer 25 is fixed in support ring 14, and lower end connects load plate 26, it is achieved that accurately Measure load plate displacement in process of the test.
Whole payload oscillation equipment is concentrated in a relatively small system by test method of the present invention, utilizes lifting Equipment 1 can realize the payload oscillation in the range of any hole depth, and test security of system is stable, and test result is accurate.Test system System easy accessibility, substantially reduces the test period, reduces experimentation cost, provides for carrying out soil body layering in-situ test in a large number Technology is possible, and prospecting and design to foundation engineering have impetus.
Deep Plate test done in currently available technology is typically by manually digging hole, and bore diameter is in more than 1m, test System complex, relatively costly, and there is certain potential safety hazard.
It is to verify the engineering properties of foundation soil that station, south, Borland Line for Passenger Transportation sky and water collapsible loess foundation processes engineering, opens Open up Deep Plate test.Utilizing manually digging hole, aperture 1.0m, aperture preloading 8 tons, jack is placed on press rods top, aperture, Utilizing transmission rod to press to load plate at the bottom of hole, displacement bar measures load plate settling amount in aperture.Process of the test occurs in that many Problem, manually digging hole depth limit is at about 15m, and manually digging hole risk is very big, does lining cutting cost the biggest in hole.Examination Test the degree of depth bigger time it is difficult to ensure that press rods perpendicularity in hole, when load is bigger, press rods waves phenomenon, and load plate Difficulty placed in the middle, displacement bar length has flexure to beat time bigger, and test data error is bigger.On time cost, single test borehole With 2 days, preloading, connection monitoring device 2 days, test 1 day, 5 days single test average used times, cost about 10000 yuan, if Testing the preloading equipment needing to remove aperture, the cycle is longer next time.Utilize the inventive method, use machinery Luoyang Spade Boring aperture 400mm, boring only need 4 hours, equipment install 4 hours, test 1 day, cost about 2000 yuan, aperture without Preloading, test system is automatically adjusted stable in hole, and experimental safe is high, and test data more accurate stable carries out next layer Only needing to hang out testing equipment during bit test to continue to hole, the maximum test degree of depth is up to 30m, safety and stability.
Present disclosure is not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention And the conversion of any equivalence that technical solution of the present invention is taked, the claim being the present invention is contained.

Claims (7)

1. the test device of soil body compression modulus and intensity in deep hole, it is characterised in that:
Including air pressure counter force system, hydraulic load plate system and test system;
Air pressure counter force system is provided with columnar sets one's heart pipe (7), sets one's heart pipe (7) exterior ring cap air pressure rubber membrane (6);Set one's heart pipe (7) top is threaded connection mode and is fixed with upper cover plate (5), and upper cover plate (5) top is provided with suspension ring (4);Set one's heart pipe (7) Bottom be welded with lower cover (20);
Hydraulic load plate system is provided with columnar lower heart pipe (12);Lower heart pipe (12) top is threaded connection mode and fixes Having pressure sensor (11), pressure sensor (11) end face to be welded with jack (10), jack (10) passes through ring flange (9) with set one's heart pipe (7) and be connected;Lower heart pipe (12) outer ring, bottom is welded with the gripper shoe (23) of annular horizontal, gripper shoe (23) It is provided above support ring (14);Support ring (14) inner ring is fixed on lower heart pipe (12) outer wall by roller bearing, and outer ring is fixed There is the hydraulic rubber film (15) of the ring-band shape that heart pipe (12) is arranged under ring, between inner ring and outer ring, be provided with radial rib, It is placed in gripper shoe (23);Lower heart pipe (12) bottom is welded with load plate (26);
Test system includes hydraulic pump (17), hydraulic tube (21), pulsometer (19), pneumatic tube (3), tester (18), surveys Examination line (8) and displacement transducer (25);Hydraulic tube (21) picks out from hydraulic pump (17), and the other end accesses hydraulic rubber film (15); Pneumatic tube (3) picks out from pulsometer (19), and the other end accesses air pressure rubber membrane (6);P-wire (8) connects from tester (18) Going out, the other end accesses the upper displacement transducer (25) arranged of support ring (14).
The test device of soil body compression modulus and intensity in deep hole the most according to claim 1, it is characterised in that:
Hydraulic rubber film control valve (24) it is provided with on hydraulic tube (21).
The test device of soil body compression modulus and intensity in deep hole the most according to claim 2, it is characterised in that:
It is provided with branch on hydraulic tube (21), accesses jack (10), branch is provided with jack control valve (22).
The test device of soil body compression modulus and intensity in deep hole the most according to claim 3, it is characterised in that:
Load plate (26) bottom is provided with bed course (16).
The test device of soil body compression modulus and intensity in deep hole the most according to claim 4, it is characterised in that:
Hydraulic tube (21), pneumatic tube (3) and p-wire (8) both pass through sets one's heart pipe (7).
The test device of soil body compression modulus and intensity in deep hole the most according to claim 5, it is characterised in that:
Suspension ring (4) are connected with hanging device (1) by lifting wirerope.
7. soil body compression modulus and the method for testing of intensity in deep hole, it is characterised in that:
Realized by following steps:
Step one: the construction of boring (2):
Utilize hanging device (1) and machinery Luoyang Spade shovel head at position, testing site pore-forming, boring (2) a diameter of load plate (26) diameter Add 100mm;
Drill bit clear hole are proposed, then toward pouring the leveling of 10cm thickness medium coarse sand at the bottom of hole into after being bored into the test degree of depth;
Step 2: test device assembles:
Assemble hydraulic load plate system, hydraulic rubber film (15) is enclosed within support ring (14) outer end, and support ring (14) set is put In lower heart pipe (12) gripper shoe (23) outward, then jack (10) and pressure sensor (11) are connected to lower heart pipe (12) Top, is fixed on displacement transducer (25) in support ring (14);
Fix fork (27) in boring (2) aperture, with hanging device (1), the hydraulic load plate system assembled is placed on fork (27) on;
Assemble air pressure counter force system, first air pressure rubber membrane (6) is sleeved on and sets one's heart pipe (7) outward, then upper cover plate (5) is tightened Setting one's heart on pipe (7), lower cover (20) is being welded in and sets one's heart pipe (7) low side;
With hanging device (1) by the hydraulic load plate system of air pressure counter force system lifting to boring (2) aperture, with bolt by method Fork (27) is taken down after blue dish (9) fastening;
Arranging test system: hydraulic tube (21) picks out from hydraulic pump (17), the other end accesses hydraulic rubber film (15);P-wire (8) pick out from tester (18), other end access digit displacement sensor (25);Pneumatic tube (3) picks out from pulsometer (19), another Terminate into air pressure rubber membrane (6);
Step 3: test:
After the hydraulic load plate system assembled and air pressure counter force system slowly being put at the bottom of hole, unclamp lifting wirerope, open gas Press pump (19) is supplied gas to air pressure rubber membrane (6), maintains 30kpa air pressure after 15 minutes, opens the gas bleeder valve of pulsometer (19) by gas Gas pressure in pressure rubber membrane (6) is decreased to 5kpa;
Read pressure sensor (11) initial value, open pulsometer (19) and air pressure rubber membrane (6) internal gas pressure is added to 30kpa, open Hydraulic pump (17) and jack control valve (22), slowly pressure sensor (11) force value, pressure sensor (11) are read in pressurization Steady pressure when pressure reaches 20kpa;
Open hydraulic rubber film control valve (24), maintain hydraulic rubber film (15) interior pressure 30kpa, close hydraulic rubber film and control Valve (24), reads displacement transducer (25) initial value;
Finder charge is divided 8 grades, pressurizes step by step with jack (10), next stage pressure could be entered after every stage pressure is stable, pressure Power stability criterion is that intrinsic displacement sensor (25) record load plate sedimentation in 60 minutes is less than 0.1mm, and every grade is pressurizeed latter 10 minutes one Secondary record pressure sensor (11) and the measured value of displacement transducer (25).
CN201410365884.0A 2014-07-29 2014-07-29 The test device of soil body compression modulus and intensity and method of testing thereof in deep hole Active CN104089826B (en)

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RU2733534C1 (en) * 2019-12-04 2020-10-05 Федеральное государственное бюджетное учреждение науки Институт горного дела им. Н.А. Чинакала Сибирского отделения Российской академии наук Bench for simulating soil deformation process with a sealant

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