CN105527197A - A testing apparatus and a method for measuring a diffusion radius for binary-slurry grouting - Google Patents

A testing apparatus and a method for measuring a diffusion radius for binary-slurry grouting Download PDF

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Publication number
CN105527197A
CN105527197A CN201511024682.0A CN201511024682A CN105527197A CN 105527197 A CN105527197 A CN 105527197A CN 201511024682 A CN201511024682 A CN 201511024682A CN 105527197 A CN105527197 A CN 105527197A
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China
Prior art keywords
sand
grouting
slurry
container
slip casting
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Pending
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CN201511024682.0A
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Chinese (zh)
Inventor
李忠超
蔡兵华
杨新
李杨
程华强
肖铭钊
罗小东
彭静
余望芝
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Wuhan Municipal Construction Group Co Ltd
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Wuhan Municipal Construction Group Co Ltd
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Application filed by Wuhan Municipal Construction Group Co Ltd filed Critical Wuhan Municipal Construction Group Co Ltd
Priority to CN201511024682.0A priority Critical patent/CN105527197A/en
Publication of CN105527197A publication Critical patent/CN105527197A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N2013/003Diffusion; diffusivity between liquids

Abstract

The invention discloses a testing apparatus for measuring a diffusion radius for binary-slurry grouting. The testing apparatus comprises a sandy soil system and a grouting system. The sandy soil system comprises a water storing container and a sealed sandy soil container. The bottom of the sandy soil container is communicated with the water storing container. The sandy soil container contains a compacted sandy soil test sample. The grouting system comprises a pneumatic supply and a sealed slurry storing container. The slurry storing container contains a binary slurry. The pneumatic supply is communicated with the top of the slurry storing container. The bottom of the slurry storing container is communicated with a grouting pipe. The lower end of the grouting pipe penetrates through a top cover of the sandy soil container and is inserted vertically into the sandy soil test sample. The part of the grouting pipe, which is inserted into the sandy soil test sample, is provided with grouting holes. A method for measuring the diffusion radius for binary-slurry grouting is also provided by the invention. The testing apparatus and the method stimulate a binary slurry grouting environment in engineering practice, measure the diffusion radius for binary-slurry grouting under different grouting pressures, provide theoretical references for diffusion radius determination of in engineering practice, and greatly reduce measurement errors of the grouting diffusion radius.

Description

A kind of test unit and method measuring dual slurry slip casting dilation angle
Technical field
The present invention relates to dual slurry testing performance of grouting equipment technical field, be specifically related to a kind of test unit and the method for measuring dual slurry slip casting dilation angle.
Technical background
In deep-foundation pit engineering, often adopt dual slurry slip casting, reinforce sandy soil stratum, form waterproof of man.The dilation angle of slurries is the important parameters evaluating grouting quality, in order to form airtight waterproof of man, grout spreading range must be made to be greater than the spacing of grouting hole, to guarantee to form overlap joint mutually between the effective reinforcing pile of dual slurry.
At present, the dilation angle of slurries adopts experimental formula or site test to determine usually.But, the infiltration coefficient on the dilation angle of slurries and coverage and stratum and grouting pressure etc. are closely related, for Different Strata, all there is larger difference in grating and perviousness, the grouting amount scope calculated by experimental formula is excessive, grouting amount is difficult to control, and the range of scatter test error of slurries is large; Site test refers to by setting at grouting hole periphery the scope that inspecting hole progressively explores grout spreading range, accurately can not obtain the dilation angle of slurries, is difficult to observe slip casting effect intuitively, and consuming time longer, costly.Therefore, be necessary to improve prior art.
Summary of the invention
Technical matters to be solved by this invention is, for the deficiencies in the prior art, provides that a kind of test result is accurate, efficiency is high, be applicable to the dual slurry slip casting dilation angle proving installation of Different Strata and method of testing.
The technical solution used in the present invention is: a kind of test unit measuring dual slurry slip casting dilation angle, mainly comprise sand system and filling system, wherein: sand system comprises the sand container of tank and sealing, the bottom of sand container is communicated with tank by pipeline, and sand container content has the sand sample of compacting; Filling system comprises the storage slurry container of pneumatic supply and sealing, and storage slurry container content has dual slurry; The top that described pneumatic supply starches container with storage is communicated with, and the bottom of storage slurry container is communicated with Grouting Pipe, and the top cover of sand container is passed in the lower end of Grouting Pipe, and vertically insert in sand sample, the part that Grouting Pipe is inserted in sand sample offers grouting hole; Grouting Pipe with the pipeline of storage slurry reservoir are configured with grouting pressure distributing valve, starch on the pipeline of reservoir in pneumatic supply and storage and configure air pressure distributing valve.
By such scheme, described test unit also comprises multiple pore pressure gauge, and pore pressure gauge, centered by Grouting Pipe, is radially distributed in sand sample.
By such scheme, described pneumatic supply is configured with barometer.
By such scheme, described sand sample is divided into multilayer, every layer of equal compacting; In every layer of sand sample centered by Grouting Pipe, radially pore pressure gauge is arranged at interval.
By such scheme, described Grouting Pipe is floral tube, and grouting hole is equilateral triangle distribution at the tube wall of Grouting Pipe.
By such scheme, the aperture of described grouting hole is 3 ~ 5mm.
Present invention also offers a kind of method measuring dual slurry slip casting dilation angle, comprise the following steps:
Step one, provide test unit as above;
Step 2, collection sand sample, test the grating of sand sample, dry density and infiltration coefficient after drying;
Step 3, a sand sample point multilayer is put into sand container, every layer hit real after imbed pore pressure gauge, re-lay lower one deck sand sample;
Step 4, intake from the bottom of sand container, sand sample is vented saturated from bottom to top, and the water surface in saturated rear maintenance sand container a little more than the upper surface of sand sample, and vacuumizes;
Step 5, in sand sample, vertically insert Grouting Pipe; In configuration dual slurry input storage slurry container, sealing storage slurry container;
Step 6, apply grouting pressure until grouting pressure reaches setting value by pneumatic supply to storage slurry container, the dual slurry in storage slurry container flows in Grouting Pipe through pipeline, records the registration of this slip casting process Pore Pressure meter and grouting pressure distributing valve;
After step 7, slip casting terminate 48 hours, excavate sand sample, measure the pile radius of dual slurry and effective slip casting dilation angle.
By such scheme, in step 3, carry out surface after every layer of sand examination sample compacting and scrape hair process, then bury pore pressure gauge and lower one deck sand examination sample compacting underground.
By such scheme, in step 3, the packing of described sand sample is 85% ~ 95%.
By such scheme, in step 5, dual slurry is that the cement of 1:1 and water glass uniform stirring are prepared from by volume, and the setting time controlling dual slurry is 2 ~ 12h.
The invention has the beneficial effects as follows: 1) the slip casting environment of dual slurry in model engineering reality of the present invention, record the slip casting dilation angle of dual slurry under different grouting pressures, for in engineering reality, the determination of slip casting dilation angle provides theoretical reference, substantially reduce the measuring error of slip casting dilation angle, can sooner, more accurate evaluation slip casting coverage and slip casting effect; 2) the present invention adopts multilayer sand sample, can record under same grouting pressure, slip casting range of scatter in the Different Strata of same position, and measurement result is comprehensive; 3) the present invention is reasonable in design, and accuracy is high, for the assessment of the dual slurry slip casting effect in engineering reality and research provide measurement means, has important research and practical engineering value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention's specific embodiment.
Wherein: 1, sand container; 2, sand sample; 3, Grouting Pipe; 4, grouting pressure distributing valve; 5, storage slurry container; 6, dual slurry; 7, O RunddichtringO; 8, base plate; 9, slurries conveyance conduit; 10, air-pressure duct; 11, baroswitch; 12, pneumatic supply; 13, air pressure distributing valve; 14, barometer; 15, pore pressure gauge; 16, tank; 17, inlet channel.
Embodiment
In order to understand the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is further described.
A kind of test unit measuring dual slurry slip casting dilation angle as shown in Figure 1, mainly comprise sand system and filling system and test macro, wherein: sand system comprises the sand container 1 of tank 16 and sealing, the bottom of sand container 1 is communicated with tank 16 by inlet channel 17, and sand container 1 is built with the sand sample 2 of compacting; Filling system comprises the storage slurry container 5 of pneumatic supply 12 and sealing, and storage slurry container 5 is built with dual slurry 6, and pneumatic supply 12 is configured with barometer 14; Pneumatic supply 12 by air-pressure duct 10 with store up the top of starching container 5 and be communicated with, air-pressure duct 10 is installed on baroswitch 11 is gentle is press-fitted pressure valve 13; The bottom of storage slurry container 5 is communicated with Grouting Pipe 3 by slurries conveyance conduit 9, slurries conveyance conduit 9 is configured with grouting pressure distributing valve 4; The top cover of sand container is passed in the lower end of Grouting Pipe 3, and vertically insert in sand sample 2, the part that Grouting Pipe 3 inserts sand sample 2 offers grouting hole; Described test unit also comprises multiple pore pressure gauge 15, and pore pressure gauge 15, centered by Grouting Pipe 3, is radially distributed in sand sample 2.
In the present invention, sand sample 2 is divided into multilayer, every layer of equal compacting; In every layer of sand sample 2, multiple pore pressure gauge 15 is arranged at interval in the horizontal direction; Grouting Pipe 3 is floral tube, and grouting hole is equilateral triangle distribution at the tube wall of Grouting Pipe 3; The vertical spacing of upper and lower two grouting holes is 30 ~ 40mm; The aperture of grouting hole is 3 ~ 5mm; Storage slurry container 5 comprises the base plate 8 of sidewall, top board and metal, and base plate 8 is connected with sidewall, and is sealed by O RunddichtringO 7.
Present invention also offers a kind of method measuring dual slurry slip casting dilation angle, the whole process of the method is carried out in the environment of temperature-controllable, in order to avoid similar test slurries change greatly setting time, causes measuring error.This method specifically comprises the following steps:
Step one, provide test unit as above: the storage slurry container 5 in the present embodiment is high 500mm, internal diameter is 400mm metal or plexiglass box; Pore pressure gauge 15 can adopt vibrating wire piezometer, and its range is not less than 1000kPa, and precision is not less than 1kPa; Grouting Pipe 3 adopts diameter to be the floral tube of 20mm, and the grouting hole in Grouting Pipe 3 is that equilateral triangle is arranged, and grouting hole is positioned at from the tube wall of Grouting Pipe 3 lower end 5 ~ 500mm.
Step 2, gather sand sample 2, sand sample 2 is placed in the baking box of 100 DEG C and dries 24 hours, and test the grating of sand sample 2, dry density and infiltration coefficient, to determine the fundamental type of soil, contrast reference with the soil property in engineering reality.
Step 3,2 points five layers, sand sample is put into sand container 1, every layer hit real after hair process is scraped to top layer, two pore pressure gauges 15 are imbedded at interval, re-lay lower one deck sand sample 2 and hit reality; It is 150mm that every layer of sand sample 2 hits the thickness in fact, and packing is 85% ~ 95%; The pore pressure gauge 15 of each layer is 150mm, 300mm, 450mm and 600mm apart from the distance of sand container 1 bottom surface.
Step 4, open the switch of inlet channel 17, the water in tank 16 infiltrates from the bottom of sand container 1 to top, and sand sample 2 is progressively vented saturated from bottom to top, and the water surface in saturated rear maintenance sand container 1 is all the time higher than the upper surface of sand sample 2; Saturated complete after, 24 hours are vacuumized to sand container 1 inside.
Step 5, in sand sample 2, vertically inserting Grouting Pipe 3 to set depth, (two pore pressure gauges 15 are 150mm, 300mm with the distance of Grouting Pipe 3 respectively; In actual measurement, when grouting pressure is larger, can centered by Grouting Pipe 3, radial uniform intervals buries multiple pore pressure gauge 15 underground); By cement and water glass uniform stirring configuration dual slurry 6 that volume is about 1:1, control the Baumé degree of water glass, ensure that the setting time of dual slurry 6 is in 2 ~ 12h; Again dual slurry 6 is inputted in storage slurry container 5, sealing storage slurry container 5.
Step 6, open air pressure distributing valve 13, regulate grouting pressure distributing valve 4, grouting pressure is applied until grouting pressure reaches setting value to storage slurry container 5 by pneumatic supply 12, dual slurry 6 in storage slurry container 5 flows in Grouting Pipe 3 through slurries conveyance conduit 9, the registration of each layer sand sample 2 Pore Pressure meter 15 and grouting pressure distributing valve 4 in record slip casting process, and draw the change curve of grouting pressure-pore water pressure.
After step 7, slip casting terminate 48 hours, excavate sand sample 2, measure the pile radius of dual slurry 6 and effective slip casting dilation angle.
The slip casting dilation angle of dual slurry 6 under multiple setting grouting pressure is measured by said method, and draw the change curve of grouting pressure-pore water pressure, can obtain under different setting grouting pressures according to curve map, from the pore water pressure size of Grouting Pipe 3 apart from different each point places; Dilation angle and the coverage of slip casting is estimated again: pore water pressure is less, and the impact of slip casting is less according to each point place pore water pressure; And contrasted by the actual measured value of this estimated value and slip casting dilation angle, and comprehensive multi-group data is rationally revised estimated value, finally obtains the slip casting dilation angle in error range.Because the sand sample 2 in sand system is distinct with the soil property in engineering reality, the dual slurry slip casting dilation angle that this measurement device obtains is theoretic reference value, certain error is there is compared with the slip casting dilation angle of reality, can revise reference value according to the situation of actual soil property, to obtain slip casting dilation angle more accurately, the coverage of assessment slip casting further and effect.
These are only the preferred embodiments of the present invention; be not limited to the present invention; although with reference to embodiment to invention has been detailed description; for a person skilled in the art; it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature, but within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. measure the test unit of dual slurry slip casting dilation angle for one kind, it is characterized in that, mainly comprise sand system and filling system, wherein: sand system comprises the sand container of tank and sealing, the bottom of sand container is communicated with tank by pipeline, and sand container content has the sand sample of compacting; Filling system comprises the storage slurry container of pneumatic supply and sealing, and storage slurry container content has dual slurry; The top that described pneumatic supply starches container with storage is communicated with, and the bottom of storage slurry container is communicated with Grouting Pipe, and the top cover of sand container is passed in the lower end of Grouting Pipe, and vertically insert in sand sample, the part that Grouting Pipe is inserted in sand sample offers grouting hole; Grouting Pipe with the pipeline of storage slurry reservoir are configured with grouting pressure distributing valve, starch on the pipeline of reservoir in pneumatic supply and storage and configure air pressure distributing valve.
2. a kind of test unit measuring dual slurry slip casting dilation angle as claimed in claim 1, it is characterized in that, described test unit also comprises multiple pore pressure gauge, and pore pressure gauge, centered by Grouting Pipe, is radially distributed in sand sample.
3. a kind of test unit measuring dual slurry slip casting dilation angle as claimed in claim 1, it is characterized in that, described pneumatic supply is configured with barometer.
4. a kind of test unit measuring dual slurry slip casting dilation angle as claimed in claim 1, is characterized in that, described sand sample is divided into multilayer compacting; In every layer of sand sample centered by Grouting Pipe, radially pore pressure gauge is arranged at interval.
5. a kind of test unit measuring dual slurry slip casting dilation angle as claimed in claim 1, is characterized in that, described Grouting Pipe is floral tube, and grouting hole is equilateral triangle distribution at the tube wall of Grouting Pipe.
6. a kind of test unit measuring dual slurry slip casting dilation angle as claimed in claim 1, is characterized in that, the aperture of described grouting hole is 3 ~ 5mm.
7. measure a method for dual slurry slip casting dilation angle, it is characterized in that, comprise the following steps:
Step one, provide test unit described in claim 1 ~ 6;
Step 2, collection sand sample, test the grating of sand sample, dry density and infiltration coefficient after drying;
Step 3, a sand sample point multilayer is put into sand container, every layer hit real after imbed pore pressure gauge, re-lay lower one deck sand sample;
Step 4, intake from the bottom of sand container, sand sample is vented saturated from bottom to top, and the water surface in saturated rear maintenance sand container a little more than the upper surface of sand sample, and vacuumizes;
Step 5, in sand sample, vertically insert Grouting Pipe; In configuration dual slurry input storage slurry container, sealing storage slurry container;
Step 6, apply grouting pressure until grouting pressure reaches setting value by pneumatic supply to storage slurry container, the dual slurry in storage slurry container flows in Grouting Pipe through pipeline, records the registration of this slip casting process Pore Pressure meter and grouting pressure distributing valve;
After step 7, slip casting terminate 48 hours, excavate sand sample, measure the pile radius of dual slurry, pile radius is the effective slip casting dilation angle of dual slurry.
8. a kind of method measuring dual slurry slip casting dilation angle as claimed in claim 7, is characterized in that, in step 3, carries out surface and scrape hair process after every layer of sand examination sample compacting, then bury pore pressure gauge and lower one deck sand examination sample compacting underground.
9. a kind of method measuring dual slurry slip casting dilation angle as claimed in claim 7, is characterized in that, in step 3, the packing of described sand sample is 85% ~ 95%.
10. a kind of method measuring dual slurry slip casting dilation angle as claimed in claim 7, is characterized in that, in step 5, dual slurry is that the cement of 1:1 and water glass uniform stirring are prepared from by volume, and the setting time controlling dual slurry is 2 ~ 12h.
CN201511024682.0A 2015-12-30 2015-12-30 A testing apparatus and a method for measuring a diffusion radius for binary-slurry grouting Pending CN105527197A (en)

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CN107703031A (en) * 2017-11-24 2018-02-16 中国矿业大学 A kind of air pressure driving loose media grouting simulation test device and test method
CN109596814A (en) * 2019-01-10 2019-04-09 中山大学 The layer of sand three-dimensional grouting test device and its test method of analog actual condition
CN109883887A (en) * 2019-03-27 2019-06-14 长安大学 A kind of highway subgrade horizontal grouting can infuse system safety testing device and evaluation method
CN110530762A (en) * 2019-09-05 2019-12-03 陕西煤业化工技术研究院有限责任公司 A kind of grouting and reinforcing liquid diffusion test device and method
CN112144507A (en) * 2020-09-29 2020-12-29 西安工业大学 Method for determining reinforcement parameters during soil body permeation grouting and reinforcement method using method
WO2021013186A1 (en) * 2019-07-24 2021-01-28 中南大学 Test device and test method for simulating earth-filling and grouting

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Publication number Priority date Publication date Assignee Title
CN107703031A (en) * 2017-11-24 2018-02-16 中国矿业大学 A kind of air pressure driving loose media grouting simulation test device and test method
CN107703031B (en) * 2017-11-24 2019-06-21 中国矿业大学 A kind of air pressure driving loose media grouting simulation test device and test method
CN109596814A (en) * 2019-01-10 2019-04-09 中山大学 The layer of sand three-dimensional grouting test device and its test method of analog actual condition
CN109883887A (en) * 2019-03-27 2019-06-14 长安大学 A kind of highway subgrade horizontal grouting can infuse system safety testing device and evaluation method
WO2021013186A1 (en) * 2019-07-24 2021-01-28 中南大学 Test device and test method for simulating earth-filling and grouting
CN110530762A (en) * 2019-09-05 2019-12-03 陕西煤业化工技术研究院有限责任公司 A kind of grouting and reinforcing liquid diffusion test device and method
CN112144507A (en) * 2020-09-29 2020-12-29 西安工业大学 Method for determining reinforcement parameters during soil body permeation grouting and reinforcement method using method

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