CN104089826A - Testing device and method for compression deformation modulus and strength of soil body in deep hole - Google Patents
Testing device and method for compression deformation modulus and strength of soil body in deep hole Download PDFInfo
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- CN104089826A CN104089826A CN201410365884.0A CN201410365884A CN104089826A CN 104089826 A CN104089826 A CN 104089826A CN 201410365884 A CN201410365884 A CN 201410365884A CN 104089826 A CN104089826 A CN 104089826A
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Abstract
The invention relates to a testing device and method for a compression deformation modulus and strength of a soil body in a deep hole. Load plate test is the most direct and reliable way for evaluating engineering foundation state; however, no device is available for an in-hole load plate test at present. According to the testing device, a supporting ring is coated with a hydraulic rubber film; the supporting ring is assembled on a supporting plate outside a bottom center pipe; then a jack and a pressure sensor are connected with the top of the bottom center pipe and a displacement sensor is fixed on the supporting ring; a top center pipe is coated with an air pressure rubber film and upper and lower cover plates are fixed; a testing system is arranged; and an air pressure pump and a hydraulic pump are started to record measured values of the pressure sensor and the displacement sensor. According to the testing device and method, an independent in-hole load plate testing system is composed of an air pressure friction reaction-force device, a loading device and the testing device; a supporting reaction force for supporting is provided for the system by friction between the air pressure film and the hole wall; the settlement amount of the load plate is directly measured by a measuring sensor and in-hole load plate testing is realized.
Description
Technical field
the invention belongs to rock-soil engineering in-situ technical field of measurement and test, be specifically related to proving installation and the method for testing thereof of the interior soil body compression deformation modulus of a kind of deep hole and intensity.
Background technology
The soil body of occurring in nature is affected by its cause condition, climatic environment etc. and causes varying of its physico-mechanical properties, obtain the soil body accurately physical and mechanical parameter be not only the important content of engineering investigation, also direct relation security and the rationality of engineering design simultaneously.In engineering, conventional geotechnological shop experiment achievement is as design considerations, but the soil body is as a kind of typical three-phase particle prose style free from parallelism deposit, disturbance during sampling, boundary condition change, transportation, size effect etc. all have certain influence to test findings, so carry out in-situ test in test site, are to obtain the relative better method of accurate soil body physical and mechanical parameter.
Evaluation engineering ground state the most reliably test method is load plate test, and modulus in compression and the bearing capacity feature of ground can layering be evaluated in internal load plate test in hole, and its result is significant to the design analysis of engineering.But at present not for hole internal load plate pilot system and method, generally by putting into after hand excavation's pore-forming after major diameter load plate in aperture preloading, at the bottom of adopting transmission rod to hole, load plate provides counter-force, displacement bar is load plate displacement at the bottom of the measured hole of earth's surface, longer transmission rod and displacement bar require impact larger for micron-sized test accuracy, and manually digging hole has a big risk, the degree of depth is little, cost is high, the cycle is long, only in important Metro Design project prospecting, there is less application.
Summary of the invention
The object of this invention is to provide proving installation and the method for testing thereof of the interior soil body compression deformation modulus of a kind of deep hole and intensity, deep foundation base is tested accurately.
The technical solution adopted in the present invention is:
The proving installation of soil body compression deformation modulus and intensity in deep hole, is characterized in that:
Comprise air pressure counter force system, hydraulic load plate system and test macro;
Air pressure counter force system is provided with columnar upper core barrel, upper core barrel exterior ring cap air pressure rubber diaphragm; The top of upper core barrel is threaded connection mode and is fixed with upper cover plate, and upper cover plate top is provided with suspension ring; The bottom of upper core barrel is welded with lower cover;
Hydraulic load plate system is provided with columnar lower core barrel; Lower core barrel top is threaded connection mode and is fixed with pressure transducer, and pressure transducer end face is welded with lifting jack, and lifting jack is connected with upper core barrel by ring flange; Outer ring, lower core barrel bottom is welded with the back up pad of annular level, and back up pad top is provided with support ring; Support ring inner ring is fixed on lower core barrel outer wall by roller bearing, and outer ring is fixed with the hydraulic rubber film of the ring-band shape of the lower core barrel setting of ring, is provided with radial rib between inner ring and outer ring, is placed in back up pad; Lower core barrel bottom is welded with load plate;
Test macro comprises hydraulic pump, hydraulic tube, air lift pump, pneumatic tube, testing tool, p-wire and displacement transducer; Hydraulic tube picks out from hydraulic pump, other end access hydraulic rubber film; Pneumatic tube picks out from air lift pump, other end access air pressure rubber diaphragm; P-wire picks out from testing tool, the displacement transducer arranging on other end access support ring.
On hydraulic tube, be provided with hydraulic rubber film operation valve.
On hydraulic tube, be provided with branch, access lifting jack, is provided with lifting jack operation valve in branch.
Load plate bottom is provided with bed course.
Hydraulic tube, pneumatic tube and p-wire are all through upper core barrel.
Suspension ring are connected with hanging device by lifting wirerope.
The method of testing of soil body compression deformation modulus and intensity in deep hole, is characterized in that:
By following steps, realized:
Step 1: the construction of boring:
Utilize hanging device and mechanical Luoyang Spade shovel head at position, testing site pore-forming, bore diameter is that load plate diameter adds 100mm;
After being bored into the test degree of depth, propose drill bit clear hole, then at the bottom of hole, pour the thick medium coarse sand leveling of 10cm into;
Step 2: proving installation assembling:
Assembling hydraulic load plate system, in support ring outer end, and is mounted on hydraulic rubber Membrane cover in the back up pad outside lower core barrel by support ring, then lifting jack and pressure transducer is connected in to lower core barrel top, and displacement transducer is fixed on support ring;
At the fixing fork of drilling orifice, with hanging device, the hydraulic load plate system assembling is placed on fork;
Assembling air pressure counter force system, is first contained in air pressure Rubber membrane cover outside upper core barrel, then upper cover plate is tightened on upper core barrel, and lower cover is welded in to upper core barrel low side;
With hanging device, air pressure counter force system is lifted to the hydraulic load plate system of drilling orifice, take down fork after ring flange is fastening with bolt;
Arrange test macro: hydraulic tube picks out from hydraulic pump, other end access hydraulic rubber film; P-wire picks out from testing tool, other end access digit displacement sensor; Pneumatic tube picks out from air lift pump, other end access air pressure rubber diaphragm;
Step 3: test:
After the hydraulic load plate system assembling and air pressure counter force system are slowly put at the bottom of hole, unclamp lifting wirerope, open air lift pump and supply gas to air pressure rubber diaphragm, maintain 30kpa air pressure after 15 minutes, the gas bleed valve of opening air lift pump is decreased to 5kpa by the gaseous tension in air pressure rubber diaphragm;
Read pressure transducer initial value, open air lift pump air pressure rubber diaphragm internal gas pressure is added to 30kpa, open hydraulic pump and lifting jack operation valve, slowly pressure transducer force value, steady pressure when pressure transducer pressure reaches 20kpa are read in pressurization;
Open hydraulic rubber film operation valve, maintain hydraulic pressure rubber diaphragm internal pressure 30kpa, close hydraulic rubber film operation valve, read displacement transducer initial value;
By trial load, divide 8 grades, with lifting jack, pressurize step by step, after every stage pressure is stable, just can enter next stage pressure, pressure stability standard is that the sedimentation of 60 minutes intrinsic displacement sensor record load plate is less than 0.1mm, every grade of rear measured value that once records pressure transducer and displacement transducer for 10 minutes of pressurization.
The present invention has the following advantages:
The present invention forms a separate wells internal load plate pilot system by rub counterforce device, charger and proving installation of air pressure, system supports for system provides support counter-force by air pressure film and hole wall friction, testing sensor is directly measured the settling amount of load plate, both there is no complicated heap support method, also not longer press rods and displacement bar, realized the automatic test that hole internal load plate is tested.The present invention compare with traditional experiment method not only safe and reliable, test data is more accurate, and has realized the load plate test in deep hole, the test degree of depth restriction that will no longer be put to the test to a certain extent, also quicker, experimentation cost is also lower.Utilize the present invention under the condition of less cost, can carry out the deep hole load plate test of engineering foundation, at phase of exploration, can carry out in-situ test to parameters such as the bearing capacity of each layer of position soil body of ground, modulus in compression, with test result, substitute shop experiment achievement and design, there is the actual loading deformation behaviour of accurate description foundation soil more and the stability of analysis project ground and the advantage of settlement amount after construction more accurately.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present invention.
In figure, 1-hanging device, 2-boring, 3-pneumatic tube, 4-suspension ring, 5-upper cover plate, 6-air pressure rubber diaphragm, the upper core barrel of 7-, 8-p-wire, 9-ring flange, 10-lifting jack, 11-pressure transducer, core barrel under 12-, 13-roller bearing, 14-support ring, 15-hydraulic rubber film, 16-bed course, 17-hydraulic pump, 18-testing tool, 19-air lift pump, 20-lower cover, 21-hydraulic tube, 22-lifting jack operation valve, 23-back up pad, 24-hydraulic rubber film operation valve, 25-displacement transducer, 26-load plate, 27-fork.
Embodiment
Below in conjunction with embodiment, the present invention will be described in detail.
The proving installation of soil body compression deformation modulus and intensity in deep hole involved in the present invention, comprises air pressure counter force system, hydraulic load plate system and test macro:
Air pressure counter force system is provided with columnar upper core barrel 7, upper core barrel 7 exterior ring cap air pressure rubber diaphragms 6; The top of upper core barrel 7 is threaded connection mode and is fixed with upper cover plate 5, and upper cover plate 5 tops are provided with suspension ring 4; The bottom of upper core barrel 7 is welded with lower cover 20.
Hydraulic load plate system is provided with columnar lower core barrel 12; Lower core barrel 12 tops are threaded connection mode and are fixed with pressure transducer 11, and pressure transducer 11 end faces are welded with lifting jack 10, and lifting jack 10 is connected with upper core barrel 7 by ring flange 9; Lower core barrel 12 outer rings, bottom are welded with the back up pad 23 of annular level, and back up pad 23 tops are provided with support ring 14; Support ring 14 inner rings are fixed on lower core barrel 12 outer walls by roller bearing, and outer ring is fixed with the hydraulic rubber film 15 of the ring-band shape of lower core barrel 12 settings of ring, is provided with radial rib between inner ring and outer ring, is placed in back up pad 23; Lower core barrel 12 bottoms are welded with load plate 26.
Test macro comprises hydraulic pump 17, hydraulic tube 21, air lift pump 19, pneumatic tube 3, testing tool 18, p-wire 8 and displacement transducer 25; Hydraulic tube 21 picks out from hydraulic pump 17, other end access hydraulic rubber film 15; Pneumatic tube 3 picks out from air lift pump 19, other end access air pressure rubber diaphragm 6; P-wire 8 picks out from testing tool 18, the displacement transducer 25 arranging on other end access support ring 14.
On hydraulic tube 21, be provided with hydraulic rubber film operation valve 24.On hydraulic tube 21, be provided with branch, access lifting jack 10, is provided with lifting jack operation valve 22 in branch.Load plate 26 bottoms are provided with bed course 16.Hydraulic tube 21, pneumatic tube 3 and p-wire 8 are all through upper core barrel 7.Suspension ring 4 are connected with hanging device 1 by lifting wirerope.
Utilize the said equipment to carry out the method for the interior soil body compression deformation modulus of deep hole and strength test, by following steps, realized:
Step 1: the construction of boring 2:
Utilize hanging device 1 and mechanical Luoyang Spade shovel head at position, testing site pore-forming, boring 2 diameters are that load plate 26 diameters add 100mm;
After being bored into the test degree of depth, propose drill bit clear hole, then at the bottom of hole, pour the thick medium coarse sand leveling of 10cm into.
Step 2: proving installation assembling:
Assembling hydraulic load plate system, hydraulic rubber film 15 is enclosed within to support ring 14 outer ends, and support ring 14 is mounted in the back up pad 23 outside lower core barrel 12, then lifting jack 10 and pressure transducer 11 are connected in to lower core barrel 12 tops, displacement transducer 25 is fixed on support ring 14;
At the fixedly fork 27 of 2 apertures of holing, with hanging device 1, the hydraulic load plate system assembling is placed on fork 27; Fork 27 is assembled by two semicircular ring, and edge is provided with outstanding attachment strap can be placed in orifice edge.
Assembling air pressure counter force system, is first sleeved on air pressure rubber diaphragm 6 outside upper core barrel 7, then upper cover plate 5 is tightened on upper core barrel 7;
With hanging device 1 by air pressure counter force system lifting to the hydraulic load plate system in 2 apertures of holing, take down fork 27 after ring flange 9 is fastening with bolt;
Arrange test macro: hydraulic tube 21 picks out from hydraulic pump 17, other end access hydraulic rubber film 15; P-wire 8 picks out from testing tool 18, other end access digit displacement sensor 25; Pneumatic tube 3 picks out from air lift pump 19, other end access air pressure rubber diaphragm 6.
Step 3: test:
1 the hydraulic load plate system assembling and air pressure counter force system are slowly put at the bottom of hole after, unclamp lifting wirerope, open air lift pump 19 and supply gas to air pressure rubber diaphragm 6, maintain 30kpa air pressure after 15 minutes, the gas bleed valve of opening air lift pump 19 is decreased to 5kpa by the gaseous tension in air pressure rubber diaphragm 6;
Read pressure transducer 11 initial values, open air lift pump 19 air pressure rubber diaphragm 6 internal gas pressures are added to 30kpa, open hydraulic pump 17 and lifting jack operation valve 22, slowly pressure transducer 11 force value, steady pressure when pressure transducer 11 pressure reach 20kpa are read in pressurization;
Open hydraulic rubber film operation valve 24, maintain hydraulic pressure rubber diaphragm 15 internal pressure 30kpa, close hydraulic rubber film operation valve 24, read displacement transducer 25 initial values;
By trial load, divide 8 grades, with lifting jack 10, pressurize step by step, after every stage pressure is stable, just can enter next stage pressure, pressure stability standard is that 60 minutes intrinsic displacement sensors 25 record load plate sedimentation and are less than 0.1mm, and the measured value of pressure transducer 11 and displacement transducer 25 is once recorded in every grade of pressurization for latter 10 minutes.
After having tested, first shed lifting jack 10 internal pressures, then shed the pressure in hydraulic rubber film 15, will after the tensioning of lifting wirerope, shed again the pressure in air pressure rubber diaphragm 6, by the anti-process dismounting testing equipment of installing.Take out after testing equipment, can continue boring to next test stratum, again pack testing equipment into and start test.
Data processing:
According to the force value of survey record and sedimentation value, draw P-S, s-t curve, thereby obtain characteristic load bearing capacity and the compression deformation modulus of this layer of position foundation soil.
Get the corresponding payload values of the proportional limit on P-S curve and, as soil body load test intensity level, according to corporal, calculate compression deformation modulus:
Wherein, λ is test parameters, gets 0.4-0.45;
P is test pressure;
D is load plate diameter;
S is test settling amount.
The test of foundation soil deep hole load plate can be obtained the physical and mechanical parameter of the original position soil body on the basis that as far as possible keeps foundation soil boundary condition, significant for ground engineering design and researchp.
Test method of the present invention utilizes air pressure rubber diaphragm 6 to produce friction force as the reaction of bearing of testing for load plate with borehole wall after certain pressure effect is expanded, thereby utilizes expand under certain pressure effect rear and hole wall of hydraulic rubber film 15 to fix and provide a stable displacement monitoring standard point for system.During lifting jack 10 work, top withstands on the air pressure counter force system being fixed on hole wall, thereby produces downward testing requirements pressure direct effect and load plate 26, and force transmission, apart from end, has guaranteed the stability of system works.After hydraulic rubber film 15 expands, support ring 14 is tightly fixed on hole wall, during test, support ring 14 is independent keeps static with system, displacement transducer 25 is fixed on support ring 14, and lower end connects load plate 26, has realized the displacement of accurate measurement load plate in process of the test.
Test method of the present invention concentrates on whole load plate testing equipment in a relatively little system, utilizes hanging device 1 can realize the load plate test within the scope of any hole depth, test macro safety and stability, and test result is accurate.Pilot system easy accessibility, has reduced the test period greatly, has reduced experimentation cost, for carrying out in a large number soil body layering in-situ test, provides technology possibility, and the prospecting of ground engineering and design are had to impetus.
The Deep Plate test of doing in currently available technology is generally by manually digging hole, and bore diameter is more than 1m, and pilot system is complicated, and cost is higher, and has 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 is processed engineering, has carried out Deep Plate test.Utilize manually digging hole, aperture 1.0m, 8 tons of aperture preloadings, lifting jack is placed on press rods top, aperture, utilize transmission rod to hole at the bottom of load plate exert pressure, displacement bar is measured load plate settling amount in aperture.In process of the test, occurred many problems, the manually digging hole degree of depth has been limited in 15m left and right, and manually digging hole risk is very large, does lining cutting cost very large again in hole.When the test degree of depth is larger, be difficult to guarantee the verticality of press rods in hole, when load is larger, press rods is waved phenomenon, and load plate is difficult between two parties, and displacement bar length has deflection to beat when larger, and test data error is larger.On time cost, single test borehole will be with 2 days, and preloading, connection monitoring equipment 2 days, test 1 day, 5 days average used times of single test, and 10000 yuan of left and right of cost, if will test the preloading equipment that need to remove aperture next time, the cycle is longer.Utilize the inventive method, adopt mechanical Luoyang Spade boring aperture 400mm, boring only needs 4 hours, equipment is installed 4 hours, test 1 day, 2000 yuan of left and right of cost, aperture is without preloading, test macro is automatic modification stability in hole, experimental safe is high, and test figure is accurate stable more, only needs to hang out testing equipment and continue boring while carrying out lower one deck bit test, the maximum test degree of depth can reach 30m, safety and stability.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading instructions of the present invention, is claim of the present invention and contains.
Claims (7)
1. the proving installation of soil body compression deformation modulus and intensity in deep hole, is characterized in that:
Comprise air pressure counter force system, hydraulic load plate system and test macro;
Air pressure counter force system is provided with columnar upper core barrel (7), upper core barrel (7) exterior ring cap air pressure rubber diaphragm (6); The top of upper core barrel (7) 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 of upper core barrel (7) is welded with lower cover (20);
Hydraulic load plate system is provided with columnar lower core barrel (12); Lower core barrel (12) top is threaded connection mode and is fixed with pressure transducer (11), and pressure transducer (11) end face is welded with lifting jack (10), and lifting jack (10) is connected with upper core barrel (7) by ring flange (9); Lower core barrel (12) outer ring, bottom is welded with the back up pad (23) of annular level, and back up pad (23) top is provided with support ring (14); Support ring (14) inner ring is fixed on lower core barrel (12) outer wall by roller bearing, and outer ring is fixed with the hydraulic rubber film (15) of the ring-band shape of lower core barrel (12) setting of ring, is provided with radial rib between inner ring and outer ring, is placed in back up pad (23); Lower core barrel (12) bottom is welded with load plate (26);
Test macro comprises hydraulic pump (17), hydraulic tube (21), air lift pump (19), pneumatic tube (3), testing tool (18), p-wire (8) and displacement transducer (25); Hydraulic tube (21) picks out from hydraulic pump (17), other end access hydraulic rubber film (15); Pneumatic tube (3) picks out from air lift pump (19), other end access air pressure rubber diaphragm (6); P-wire (8) picks out from testing tool (18), the upper displacement transducer (25) arranging of other end access support ring (14).
2. the proving installation of soil body compression deformation modulus and intensity in deep hole according to claim 1, is characterized in that:
On hydraulic tube (21), be provided with hydraulic rubber film operation valve (24).
3. the proving installation of soil body compression deformation modulus and intensity in deep hole according to claim 2, is characterized in that:
Hydraulic tube is provided with branch on (21), and access lifting jack (10), is provided with lifting jack operation valve (22) in branch.
4. the proving installation of soil body compression deformation modulus and intensity in deep hole according to claim 3, is characterized in that:
Load plate (26) bottom is provided with bed course (16).
5. the proving installation of soil body compression deformation modulus and intensity in deep hole according to claim 4, is characterized in that:
Hydraulic tube (21), pneumatic tube (3) and p-wire (8) are all through upper core barrel (7).
6. the proving installation of soil body compression deformation modulus and intensity in deep hole according to claim 5, is characterized in that:
Suspension ring (4) are connected with hanging device (1) by lifting wirerope.
7. the method for testing of soil body compression deformation modulus and intensity in deep hole, is characterized in that:
By following steps, realized:
Step 1: the construction of boring (2):
Utilize hanging device (1) and mechanical Luoyang Spade shovel head at position, testing site pore-forming, boring (2) diameter is that load plate (26) diameter adds 100mm;
After being bored into the test degree of depth, propose drill bit clear hole, then at the bottom of hole, pour the thick medium coarse sand leveling of 10cm into;
Step 2: proving installation assembling:
Assembling hydraulic load plate system, hydraulic rubber film (15) is enclosed within to support ring (14) outer end, and support ring (14) is mounted in the outer back up pad (23) of lower core barrel (12), then lifting jack (10) and pressure transducer (11) are connected in to lower core barrel (12) top, displacement transducer (25) is fixed on support ring (14);
At the fixedly fork (27) of (2) aperture of holing, with hanging device (1), the hydraulic load plate system assembling is placed on fork (27);
Assembling air pressure counter force system, is first sleeved on air pressure rubber diaphragm (6) outside upper core barrel (7), then upper cover plate (5) is tightened in to upper core barrel (7) upper, and lower cover (20) is welded in to upper core barrel (7) low side;
With hanging device (1) by air pressure counter force system lifting to the hydraulic load plate system in boring (2) aperture, take down fork (27) after ring flange (9) is fastening with bolt;
Arrange test macro: hydraulic tube (21) picks out from hydraulic pump (17), other end access hydraulic rubber film (15); P-wire (8) picks out from testing tool (18), other end access digit displacement sensor (25); Pneumatic tube (3) picks out from air lift pump (19), other end access air pressure rubber diaphragm (6);
Step 3: test:
After the hydraulic load plate system assembling and air pressure counter force system are slowly put at the bottom of hole, unclamp lifting wirerope, opening air lift pump (19) supplies gas to air pressure rubber diaphragm (6), maintain 30kpa air pressure after 15 minutes, the gas bleed valve of opening air lift pump (19) is decreased to 5kpa by the gaseous tension in air pressure rubber diaphragm (6);
Read pressure transducer (11) initial value, open air lift pump (19) air pressure rubber diaphragm (6) internal gas pressure is added to 30kpa, open hydraulic pump (17) and lifting jack operation valve (22), slowly pressure transducer (11) force value, steady pressure when pressure transducer (11) pressure reaches 20kpa are read in pressurization;
Open hydraulic rubber film operation valve (24), maintain hydraulic pressure rubber diaphragm (15) internal pressure 30kpa, close hydraulic rubber film operation valve (24), read displacement transducer (25) initial value;
By trial load, divide 8 grades, with lifting jack (10), pressurize step by step, after every stage pressure is stable, just can enter next stage pressure, pressure stability standard be 60 minutes intrinsic displacement sensor (25) record load plate sedimentation and be less than 0.1mm, the measured value of pressure transducer (11) and displacement transducer (25) is once recorded in every grade of pressurization for latter 10 minutes.
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| CN104404940B (en) * | 2014-12-05 | 2016-04-13 | 西南交通大学 | A kind of Deep Soil Layers high pressure waterproof self-stabilising load test device |
| CN104404940A (en) * | 2014-12-05 | 2015-03-11 | 西南交通大学 | High-pressure, waterproof and self-stabilized type load testing device for deep soil layer |
| CN104991048A (en) * | 2015-06-29 | 2015-10-21 | 中国电建集团成都勘测设计研究院有限公司 | Method for determining deformation modulus of great-depth coarse-grained soil |
| CN107036893A (en) * | 2017-05-31 | 2017-08-11 | 南京理工大学 | The compact formed process mechanical behavior test device of bulk material and its method of testing |
| CN110080746A (en) * | 2019-05-24 | 2019-08-02 | 北京爱地地质勘察基础工程公司 | A kind of compression test equipment and its application method in situ of drilling |
| CN110241869B (en) * | 2019-07-15 | 2023-12-01 | 重庆科技学院 | Device and method for testing dynamic load of foundation bearing capacity flat plate |
| CN110241869A (en) * | 2019-07-15 | 2019-09-17 | 重庆科技学院 | A kind of foundation bearing capacity plate dynamic loading experiment device and method |
| CN110749504A (en) * | 2019-10-31 | 2020-02-04 | 三峡大学 | Partitioned lateral pressure creep test device for coral sand foundation and use method |
| CN110749504B (en) * | 2019-10-31 | 2022-04-22 | 三峡大学 | Partitioned lateral pressure creep test device for coral sand foundation and use method |
| CN111366468B (en) * | 2020-02-19 | 2021-06-08 | 中国铁路设计集团有限公司 | Side pressure electrical measurement test system and test method |
| CN111366468A (en) * | 2020-02-19 | 2020-07-03 | 中国铁路设计集团有限公司 | Side pressure electrical measurement test system and test method |
| CN113533065A (en) * | 2021-07-15 | 2021-10-22 | 武汉吉欧信海洋科技股份有限公司 | In-situ soil external friction angle testing device and testing method |
| CN113533065B (en) * | 2021-07-15 | 2022-03-11 | 武汉吉欧信海洋科技股份有限公司 | In-situ soil external friction angle testing device and testing method |
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