CN102680329B - Drawing type soil layer shearing strength testing device and method for testing by using same - Google Patents

Drawing type soil layer shearing strength testing device and method for testing by using same Download PDF

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Publication number
CN102680329B
CN102680329B CN201210142012.9A CN201210142012A CN102680329B CN 102680329 B CN102680329 B CN 102680329B CN 201210142012 A CN201210142012 A CN 201210142012A CN 102680329 B CN102680329 B CN 102680329B
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soil layer
agitator
drawing bar
bar
ability
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CN201210142012.9A
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CN102680329A (en
Inventor
汪哲荪
魏松
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Hefei University of Technology
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Hefei University of Technology
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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a drawing type soil layer shearing strength testing device and a method for testing by using the same. The drawing type soil layer shearing strength testing device comprises a base, a drawing type soil layer shearing strength tester, a drawing rod and a displacement sensor and is characterized in that the base and the drawing type soil layer shearing strength tester are arranged on a test point of a soil layer, a connecting rod joint of the drawing type soil layer shearing strength tester is connected with the drawing rod placed in the soil layer, a hand wheel of the drawing type soil layer shearing strength tester is rotated to lift the drawing rod until the soil layer is sheared, and the shearing strength of the soil layer is tested. The drawing type soil layer shearing strength testing device and the method for testing by using the same are suitable for in-site test of total dewatering-free shearing strength of soil layers such as a foundation pit, a side slope and the like and rapidly making engineering evaluation on the soil layers.

Description

Drawing type soil layer shear resistance tester and method of testing thereof
Technical field
The present invention relates to a kind of instrument and equipment of on-the-spot test soil layer shearing strength, specifically a kind of drawing type soil layer shear resistance tester and method of testing thereof.
Background technology
At present, the instrument that can test at the scene original state soil layer shear resistance only has vane shear test geotechnique instrument.This instrument can only be done the shear strength test of soft clay soil layer, for the shear resistance index of doing viscosity or sandy soil layer, can only cut undisturbed sample or prepare disturbed soil sample, in laboratory, by direct shear test or triaxial shear test, drawn, if so require the on-the-spot shear resistance index of making viscosity or sandy soil layer, and fast soil layer is made to engineering judgment and just can not satisfy the demands.
Summary of the invention
For the deficiency of existing test original state soil layer shear strength test instrument, the present invention proposes a kind of drawing type soil layer shear resistance tester and method of testing thereof that can complete at the scene viscosity or sandy soil layer shear strength test.
Technical solution problem of the present invention adopts following technical scheme:
The design feature of a kind of drawing type soil layer of the present invention shear resistance tester is: by being arranged on base plate on base, be fixedly installed on two heel posts on base plate and at the top of described column and be connected to the framework that the crossbeam between two heel posts forms; On described crossbeam, be provided with handwheel, vertical screw rod runs through crossbeam central pilot hole through handwheel is connected with the top that is positioned at the ring of measuring one's own ability of framework, in described bottom of measuring one's own ability ring, be connected with vertical extension bar, described extension bar runs through the center through hole of base plate, is provided for the joint being connected with drawing bar in the bottom of described extension bar; At the fixing organic box of rear side of described base plate, the side of machine box is mounted with display, temperature sensor and cable fixing head; In the described ring of measuring one's own ability, installed displacement transducer, the sensor stand of described displacement transducer is fixed on the end face of base plate, and the centerline direction encircling along handwheel of measuring one's own ability described in the rotation of handwheel drives by screw rod moves; Described screw rod, the ring of measuring one's own ability, extension bar and the center line of displacement transducer and the center line of described handwheel overlap.
The matching used drawing bar of described drawing type soil layer shear resistance tester, its design feature is: described drawing bar is a pipe, the epimere of pipe is external thread, in hypomere pipe, be disposed radially bearing pin, on described bearing pin, be set with agitator, on agitator, have anchor block, on anchor block, bolt has wire rope, and wire rope is drawn from the top mouth of pipe of drawing bar; Described agitator can be in the tube cavity that is vertically contained in drawing bar, offers the spademan mouth outside the pipe that supplies described agitator to rotate and extend in drawing bar on the two side of drawing bar; Pull wire rope can make agitator launch to be with the center line of described drawing bar to be 90 ° of angles.
The design feature of described drawing bar is also: described agitator is yi word pattern, the middle part of agitator is square agitator seat, the central authorities of agitator seat are a pin shaft hole, and both sides are agitator blade, and described anchor block is positioned on the agitator seat with the perpendicular side of pin shaft hole.
The method of utilizing described tester and described drawing bar to carry out the test of soil layer shear resistance is carried out according to the following procedure:
First, pedestal for placed on tested soil layer, settles rig on base, get out the soil layer circular hole that reaches projected depth in soil layer, remove after the dregs in soil layer circular hole, in soil layer circular hole, insert drawing bar, and by rig, clamped the epimere of drawing bar, start rig, limit rotation drawing bar, limit pulls fastens the wire rope on anchor block on drawing bar agitator and launches agitator, until agitator, is expanded to the center line of drawing bar and is after 90 ° of angle states, promotes the height of drawing bar reaming 2~10cm, then, in drawing bar rod tube, inject solidification liquid on one side, be rotated further on one side and the height of the drawing bar 2~10cm that declines, solidification liquid is stopped operating with being stirred after soil that the wing (41) reaming smashes stirs into mixture, body to be mixed solidifies with drawing bar is common and forms after one " ⊥ " shape part, unload rig, on base, settle drawing type soil layer shear resistance tester, the joint of tester is connected with drawing bar, rotating handwheel makes to move on screw rod until tighten and measure one's own ability after ring, displacement transducer reading is made zero, again rotate and on handwheel, move screw rod, through measuring one's own ability, ring promotes drawing bar, until soil layer shear failure and being stirred, record the opposing pulling force of being stirred the soil body, converse the shearing strength of soil layer.
Drawing type soil layer shear resistance tester of the present invention and drawing bar are based on following principle of work:
The principle of work of drawing bar: under the prerequisite of not disturbance original state soil layer, adopt drill bit to get out boring in soil layer.In boring, insert the degree of depth that drawing bar reaches setting, limit rotation drawing bar, limit pours into solidification liquid, and launches the agitator in drawing bar, carries out reaming, stirring, and the agitator of expansion is rested on to the bottom of mixture.After solidifying, mixture for there being the drawing plate of certain area, forms " ⊥ " shape together with drawing bar, with the energy drawing soil layer soil body.
The principle of work of drawing type soil layer shear resistance tester test beds shear resistance: drawing type soil layer shear resistance tester is arranged on spider, after joint on it is connected with drawing bar, rotate handwheel lift-bolt, by measure one's own ability ring and extension bar, slightly strain and be placed in the drawing bar in soil layer, by being butted on the displacement transducer reading of measuring one's own ability on ring, make zero.Be rotated further handwheel lift-bolt, drawing drawing bar, now soil body opposing pulling capacity F equals soil body deadweight G and pulls the upper shear stress τ sum (being F=G+ τ S) of soil boundary face S, continue drawing drawing bar, until pull the soil body of soil layer, measure the full-scale reading value of displacement transducer, with calibration value comparison, obtain the not Drainage Shear total intensity of soil layer.
Compared with the prior art, beneficial effect of the present invention is embodied in:
Viscosity or grittiness original state soil layer shear strength test are done in tester energy of the present invention scene, and accuracy is good, the life-span is long, simple in structure, simple installation, show that data, cost are low in real time.Especially be suitable for determining the not Drainage Shear total intensity of the soil layers such as the end of testing pits, side slope, to reflect strictly according to the facts the impact of reservoir pressure on undisturbed soil shearing strength, can to soil layer, make engineering judgment fast.
Accompanying drawing explanation
Figure 1A, Figure 1B and Fig. 1 C are respectively just the analysing and observe of drawing type soil layer shear resistance tester of the present invention, side is analysed and observe and plan structure schematic diagram.
Fig. 2 A, Fig. 2 B, Fig. 2 C and Fig. 2 D be respectively just the analysing and observe of drawing bar in the present invention, left side depending on, right side is looked and plan structure schematic diagram.
Fig. 3 A, Fig. 3 B and Fig. 3 C are respectively the facing of agitator in the present invention, side-looking and plan structure schematic diagram.
Fig. 4 is drawing type soil layer shear resistance tester work schematic diagram of the present invention.
Number in the figure: 1 soil layer, 2 is stirred the soil body, 3 mixture drawing plates, 4 bases; 11 drawing type soil layer shear resistance testers, 12 base plates, 13 columns, 14 crossbeams, 15 handwheels, 16 screw rods, 17 measure one's own ability ring, 18 extension bars, 19 joints, 20 displacement transducers, 21 sensor stands, 22 machine boxes, 23 temperature sensors, 24 cable fixing heads; 31 drawing bars, 32 spademan mouths, 33 bearing pins, 34 wire rope; 41 agitators, 42 agitator seats, 43 agitator blades, 44 pin shaft holes, 45 anchor blocks.
Embodiment
Referring to Figure 1A, Figure 1B and Fig. 1 C, in the present embodiment, drawing type soil layer shear resistance tester 11 is framed structure, and the top that each side has 13, two columns 13 of a column that is fixedly installed on the base plate 12 on base 4 has crossbeam 14 to be connected.On crossbeam 14, there is handwheel 15, the pilot hole of vertical screw rod 16 in the middle of handwheel 15 passes crossbeam 14, be connected with ring 17 tops of measuring one's own ability in framework, ring 17 the bottom of measuring one's own ability is connected with vertical extension bar 18, extension bar 18 runs through the circular hole in the middle of base plate 12 and base 4, and there is the joint 19 being connected with drawing bar 31 bottom of extension bar 18.The fixing organic box 22 of rear side of base plate 12, the side of machine box 22 is mounted with display, temperature sensor 23, cable fixing head 24.The ring of measuring one's own ability has installed displacement transducer 20 in 17, and the support 21 of displacement transducer is fixed on the end face of base plate 12, rotates handwheel 15 ring 17 centerline directions along this tester 11 that can make to measure one's own ability and moves.The center line of screw rod 16, measure one's own ability ring 17, extension bar 18, displacement transducer 20 overlaps with the center line of this tester 11.
Referring to Fig. 2 A, Fig. 2 B, Fig. 2 C and Fig. 2 D, in the present embodiment, drawing bar 31 is round tube shape, and upper and lower end opening forms passage.The epimere of drawing bar is external thread section, is fixed with horizontal bearing pin 33 on hypomere inwall, is set with agitator 41 on bearing pin 33, has anchor block 45 on agitator 41, and on anchor block 45, bolt has wire rope 34, and wire rope 34 is drawn from the upper end open of drawing bar 31.Agitator 41 is vertically contained in the cavity of bar, has the spademan mouth 32 producing for agitator 41 on two side lever walls of this cavity corresponding position.Pull the wire rope 34 on anchor block 45, can make agitator 41 be expanded to drawing bar 31 center lines and be 90 ° of angles.
Referring to Fig. 3 A, Fig. 3 B and Fig. 3 C, in the present embodiment, agitator 41 is yi word pattern, the centre of agitator 41 is square agitator seat 42, there is a pin shaft hole 44 centre of agitator seat 42, respectively there is the stirring fin 43 of a α angle both sides, and anchor block 45 is positioned on the agitator seat 42 with pin shaft hole 44 vertical side.
Method of testing:
As shown in Figure 4, first pedestal for placed 4 on tested soil layer 1, on base 4, settle rig, in soil layer 1, get out the soil layer circular hole that reaches projected depth, remove after the dregs in soil layer circular hole, in soil layer circular hole, insert drawing bar 31, and by rig, clamped the epimere of drawing bar 31, start rig, limit rotation drawing bar 31, limit pulls fastens the wire rope 34 on anchor block 45 on drawing bar 31 agitators 41 and launches agitator 41, until agitator 41, is expanded to the center line of drawing bar (31) and is after 90 ° of angle states, promotes the height of drawing bar 31 reaming 2~10cm, then, in drawing bar 31 rod tubes, inject solidification liquid on one side, be rotated further on one side and the height of the drawing bar 312~10cm that declines, solidification liquid is stopped operating with being stirred after soil that the wing 41 reamings smash stirs into mixture, body to be mixed solidifies with drawing bar is common and forms after one " ⊥ " shape part, unload rig, on base 4, settle drawing type soil layer shear resistance tester 11, the joint of tester 11 19 is connected with drawing bar 31, rotating handwheel 15 makes to move on screw rod 16 until tighten and measure one's own ability after ring 17, displacement transducer 20 readings are made zero, again rotate and on handwheel 15, move screw rod 16, through measuring one's own ability, ring 17 promotes drawing bar 31, until soil layer 1 shear failure and being stirred, record the opposing pulling force of being stirred the soil body 2, converse the shearing strength of soil layer 1.
Soil layer 1 is to make the foundation pit earth of engineering judgment or side slope soil etc.; Stirred the soil body that the soil body 2 is stirred rear shear failure; The effect of mixture drawing plate 3 is to form loading plate to be stirred the soil body 2 for stirring; Base 4 is for settling rig or drawing type soil layer shear resistance tester 11; On drawing type soil layer shear resistance tester 11, base plate 12 is for vertical columns 13, sensor stand 21 and machine box 22; Column 13 is for supporting traverse 14; Crossbeam 14 is for settling handwheel 15 and screw rod 16; Handwheel 15 is for lift-bolt 16; Screw rod 16 is for promoting the ring 17 of measuring one's own ability; Measure one's own ability ring 17 for measuring pulling capacity; Extension bar 18 is that the ring of measuring one's own ability is connected with drawing bar 31; Joint 19 is connected between extension bar 18 and drawing bar 31 for making; Displacement transducer 20 is for measuring the distortion of the ring 17 of measuring one's own ability; Sensor stand 21 is for fixed displacement sensor 20; Machine box 22 is for settling display, circuit board, temperature sensor 23 and cable fixing head 24; Temperature sensor 23 is for revising the impact of temperature on ring 17 distortion of measuring one's own ability; Cable fixing head 24 is for outgoing cable; Drawing bar 31 goes out the tested soil body 2 for drawing; Spademan mouth 32 is the opening of the agitator 41 of tossing about in bed out on drawing bar 31; Bearing pin 33, for fixing agitator 41, makes agitator 41 rotate and launch around this bearing pin 33; Wire rope 34 is for opening agitator 41; The effect of agitator 41 is the reamings of anchor head position, and the solidification liquid being pressed into and soil layer soil are stirred into mixture; Agitator seat 42 is for fixing agitator blade 43, and rotates around bearing pin 33; Pin shaft hole 44 is for the fixed pin shaft 33 that slides; Anchor block 45 is for tacking by wire rope 34 to open agitator 41.

Claims (3)

1. a drawing type soil layer shear resistance tester, is characterized in that:
The version of described drawing type soil layer shear resistance tester is: by the crossbeam (14) that is arranged on base plate (12) on base (4), is fixedly installed on two heel posts (13) on base plate (12) and is positioned at the top of described column and be connected between two heel posts (13), form framework; On described crossbeam (14), be provided with handwheel (15), vertical screw rod (16) runs through crossbeam central pilot hole through handwheel (15) is connected with the top that is positioned at the ring (17) of measuring one's own ability of framework, in described bottom of measuring one's own ability ring (17), be connected with vertical extension bar (18), described extension bar (18) runs through the center through hole of base plate (12), is provided for the joint (19) being connected with drawing bar (31) in the bottom of described extension bar (18); At the fixing organic box (22) of rear side of described base plate (12), the side of machine box (22) is mounted with display, temperature sensor (23) and cable fixing head (24); In the described ring (17) of measuring one's own ability, installed displacement transducer (20), the sensor stand (21) of described displacement transducer (20) is fixed on the end face of base plate (12), and the ring (17) of measuring one's own ability described in the rotation of handwheel (15) drives by screw rod (16) moves along the centerline direction of handwheel; The center line of described screw rod (16), the ring (17) of measuring one's own ability, extension bar (18) and displacement transducer (20) overlaps with the center line of described handwheel;
Described drawing bar (31) is a pipe, the epimere of pipe is external thread, in hypomere pipe, be disposed radially bearing pin (33), on described bearing pin (33), be set with agitator (41), on agitator (41), there is anchor block (45), the upper bolt of anchor block (45) has wire rope (34), and wire rope (34) is drawn from the top mouth of pipe of drawing bar (31); Described agitator (41) can be in the tube cavity that is vertically contained in drawing bar (31), offers the spademan mouth (32) outside the pipe that supplies described agitator (41) to rotate and extend in drawing bar (31) on the two side of drawing bar (31); Pull wire rope (34) can make agitator (41) launch to be with the center line of described drawing bar (31) to be 90 ° of angles.
2. drawing type soil layer shear resistance tester according to claim 1, it is characterized in that: described agitator (41) is yi word pattern, the middle part of agitator (41) is square agitator seat (42), the central authorities of agitator seat (42) are a pin shaft hole (44), both sides are agitator blade (43), and described anchor block (45) is positioned on the agitator seat (42) with the perpendicular side of pin shaft hole (44).
3. utilize the method that drawing type soil layer shear resistance tester carries out the test of soil layer shear resistance described in claim 1, it is characterized in that:
First, at the upper pedestal for placed (4) of tested soil layer (1), the upper rig of settling of base (4), in soil layer (1), get out the soil layer circular hole that reaches projected depth, remove after the dregs in soil layer circular hole, in soil layer circular hole, insert drawing bar (31), and by rig, clamped the epimere of drawing bar (31), start rig, limit rotation drawing bar (31), limit pulls the wire rope (34) of fastening on the upper anchor block (45) of drawing bar (31) agitator (41) to launch agitator (41), until agitator (41), be expanded to the center line of drawing bar (31) and be after 90 ° of angle states, promote the height of drawing bar (31) reaming 2~10 ㎝, then, in drawing bar (31) rod tube, inject solidification liquid on one side, be rotated further on one side and the height of drawing bar (31) 2~10 ㎝ that decline, solidification liquid is stopped operating with being stirred after soil that the wing (41) reaming smashes stirs into mixture, body to be mixed solidifies with drawing bar is common and forms after one " ⊥ " shape part, unload rig, at the upper drawing type soil layer shear resistance tester (11) of settling of base (4), the joint of tester (11) (19) is connected with drawing bar (31), rotating handwheel (15) makes to move on screw rod (16) until tighten and measure one's own ability after ring (17), displacement transducer (20) reading is made zero, again rotate and on handwheel (15), move screw rod (16), through measuring one's own ability, ring (17) promotes drawing bar (31), until soil layer (1) shear failure and being stirred, record the opposing pulling force of being stirred the soil body (2), converse the shearing strength of soil layer (1).
CN201210142012.9A 2012-04-24 2012-04-24 Drawing type soil layer shearing strength testing device and method for testing by using same Expired - Fee Related CN102680329B (en)

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CN104990812B (en) * 2015-07-22 2017-11-28 中国农业大学 A kind of meadow shearing force home position testing method and device
CN109490082B (en) * 2018-12-21 2024-06-21 廊坊市阳光建设工程质量检测有限公司 Automatic direct pulling equipment for common bearing platform for detecting concrete strength by pull-out method
CN110823717B (en) * 2019-11-01 2022-04-19 广州大学 Semi-flexible pavement shear strength testing device and testing method
CN111999243B (en) * 2020-08-28 2022-07-29 西南交通大学 Asphalt pavement interlayer bonding performance cutting-drawing test device and evaluation method thereof

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Publication number Priority date Publication date Assignee Title
CN2081533U (en) * 1990-12-01 1991-07-24 中国建筑第一工程局建筑科学研究所 Electric draw-off instrument for concrete drawing test
CN2581970Y (en) * 2002-12-02 2003-10-22 南京土壤仪器厂 Strain controlled three-shaft apparatus shearing device
CN101226088A (en) * 2007-11-13 2008-07-23 山东省建筑科学研究院 Multifunctional digital display dynamometer
CN201555780U (en) * 2009-12-23 2010-08-18 东营市盛基环保工程有限公司 Multifunctional wood adhesive bonding strength testing machine
CN102252906A (en) * 2011-06-13 2011-11-23 南京大学 Clayey soil strain control type uniaxial extension meter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2081533U (en) * 1990-12-01 1991-07-24 中国建筑第一工程局建筑科学研究所 Electric draw-off instrument for concrete drawing test
CN2581970Y (en) * 2002-12-02 2003-10-22 南京土壤仪器厂 Strain controlled three-shaft apparatus shearing device
CN101226088A (en) * 2007-11-13 2008-07-23 山东省建筑科学研究院 Multifunctional digital display dynamometer
CN201555780U (en) * 2009-12-23 2010-08-18 东营市盛基环保工程有限公司 Multifunctional wood adhesive bonding strength testing machine
CN102252906A (en) * 2011-06-13 2011-11-23 南京大学 Clayey soil strain control type uniaxial extension meter

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