CN101105433B - Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method - Google Patents

Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method Download PDF

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Publication number
CN101105433B
CN101105433B CN2007100253804A CN200710025380A CN101105433B CN 101105433 B CN101105433 B CN 101105433B CN 2007100253804 A CN2007100253804 A CN 2007100253804A CN 200710025380 A CN200710025380 A CN 200710025380A CN 101105433 B CN101105433 B CN 101105433B
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China
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frame
rigid frame
shear
sample
test
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CN2007100253804A
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Chinese (zh)
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CN101105433A (en
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刘斯宏
臧德记
汪易森
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河海大学
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Abstract

A direct shear tester for both portable field test and indoor test and a sampling and testing method are provided. The tester comprises a sampling device, a portable vertical load system and a horizontal shear system. The testing method comprises burying a rigid frame together with a cruciform shear frame in the soil of a place to be test, digging out the whole soil containing the rigid frame andthe cruciform shear frame to obtain an integrated sample with less interference, placing and fixing the integrated sample in a rigid frame base on a box-shaped frame, applying a vertical force by using the portable vertical load system on the box-shaped frame, and measuring the strength of the sample by using the shear frame. During the test process, the volume change of the sample in the vertical direction is not limited. The tester has simple structure, easy operation and good portability. The testing method employs flexible tension shear mode instead of the rigid top-bunt shear mode, overcomes the friction and sampling problems, and avoids the vertical pressure offset during the test process by using the portable vertical loading system, thereby increasing the test accuracy.

Description

Portable field and indoor dual-purpose direct shear test instrument and sampling and testing method thereof

One. technical field

The present invention relates to a kind of direct shear test instrument of soil strength test and the sampling and testing method of direct shear test thereof.This instrument particularly can be tested the intensive parameter of nature slight slope, embankment slight slope, various foundation surfaces at the scene quickly and easily.

Two. background technology

The direct shear test instrument is divided into shop experiment direct shear apparatus and site test direct shear apparatus.Conventional indoor direct shear test instrument has upper and lower two shear boxs, after sample is put into shear box, applies certain pressure at right angle at the sample top, promotes shear box, sample is cut to destruction, thereby obtained the intensive parameter of the soil body.Owing to sample is cut, must be to be rigidly connected between shear box and measuring one's own ability encircles with the method that promotes shear box.In shear history,, influenced the correct test of soil strength if sample generation volume change can produce friction force at its contact point place, and this friction force can't be measured in test, thereby make that normal stress and the actual normal stress that adds on the shear surface are inconsistent.The site test direct shear apparatus just strengthens the size of shop experiment direct shear apparatus mostly, the same frictional influence problem that has a place that is rigidly connected.The original state sample of shop experiment is normally obtained with sleeve at the scene, with lifting jack sample is pressed in the shear box then, or unloads lower sleeve earlier, puts into shear box then.The original state sample that this mode obtains very easily is subjected to disturbance, can not reflect the virtual condition of the on-the-spot soil body fully.

Three. summary of the invention

The objective of the invention is to solve be rigidly connected in the conventional direct shear test instrument place the frictional influence problem and get scratching of original state sample and may I ask topic, and a kind of portable field and indoor dual-purpose direct shear test instrument and sampling and testing method thereof, the technical scheme of employing are provided is to change the sample mode of being cut into flexible stretching mode by rigidity pushing tow mode; Sampler directly as the down cut box, can directly be tested at the scene; And this direct shear apparatus also can be made the original state sample or reinvent the sample direct shear test indoor.A whole set of apparatus can be packed in the box frame, convenient in carrying.

A kind of portable field and indoor dual-purpose direct shear test instrument, comprise sampling equipment, vertical loading system, it is characterized in that it comprises that also horizontal stretch-draw cut system, wherein sampling equipment is formed with rigid frame (3) by shearing frame (2), shearing frame (2) places the top of rigid frame (3), vertical loading system is portable, wherein two crossbeam pillars (18) are fixedly connected on respectively on two rams (34) of roller system (30), pulley system is by two rolling wheel guide rails (31), two rollers (32) are embedded in the U type groove of rolling wheel guide rails (31), and roller bearing (33) is connected roller (32) with ram (34); The end that two chains (12) in the system are cut in horizontal stretch-draw is connected on the chain hook of shearing on the frame (2) (11), the other end is connected on the steel annulus of web member (14) one ends, the other end of web member (14) is by being threaded on the pulling force sensor (13), the other end of pulling force sensor (13) is connected with the handwheel catch bar (15) with screw thread, handwheel (16) is connected with handwheel catch bar (15), handwheel catch bar (15) can advance or retreat when rotating handwheel (16), and horizontal stretch-draw is cut system and is fixed on the boxed frame (7) by bolt (17).

Above-mentioned shearing frame (2) is the square box of " ten " font frame (28), and two chains hooks (11) are arranged on the side of shearing frame (2), and its central part has set up horizontal displacement meter (6); Described rigid frame (3) dead size is identical with shearing frame (2), outside four faces in the two lower end are edge of a knife shape, rigid frame (3) is placed in the rigid frame base (4), and fixing with screw (8), rigid frame base (4) uses bolt (27) to be fixed on the boxed frame (7) again.

The lower end of the force-transmitting pole (10) in the above-mentioned vertical loading system is fixed on the force transmitting board (9), the center of the two is on same vertical line, and the center line of the two is by the center of sample (1), the bed-plate dimension of force transmitting board (9) is identical with the planar dimension of shearing frame (2), vertical displacement meter (5) is equipped with on the top of force transmitting board (9), the other end of force-transmitting pole (10) is connected with fulcrum end cap (20) with lever (24) by lever bearing (19), the end of lever (24) is hanging scaffold (25), the hanging scaffold lower end is counterweight (26), pillar (29) has screw thread, its lower end snail is advance fulcrum end cap (20) lining, and it is fixing with pillar nut I (21), pillar (29) upper ends is in the center pit of crossbeam (23), and can move up and down, so just can make force transmitting board (9), force-transmitting pole (10) is adjusted height in vertical direction as required up and down, height control well after, pillar (29) is fixed on the crossbeam (23) by pillar nut II (22), crossbeam (23) is supported by two crossbeam pillars (18), and it is fixing by nut (35), crossbeam pillar (18) other end has screw thread, its spiral shell is advance ram (34) lining, ram (34) is enclosed within outside the rolling wheel guide rails (31), on rolling wheel guide rails (31) has, following two, the bottom roller guide rail is fixed on the boxed frame (7), and the two ends of two rolling wheel guide rails (31) are by on fixing, the bolt of bottom roller guide rail (36) is fixing.

The chain (12) that above-mentioned horizontal stretch-draw is cut in the system is two steel link chains or wire rope, and every is about 15cm.

The sampling and testing method of a kind of portable field and indoor dual-purpose direct shear test instrument is characterized in that the sampling and testing step is as follows:

Specimen preparation

Site test: select comparatively smooth place in the testing ground, a rigid frame 3 is imbedded in the ground Fig. 5 (a) earlier; When treating that rigid frame is imbedded to foundation surface, Fig. 5 (b), with the rigid frame Outboard Sections, promptly the 37 interior soil bodys dig out; Cross shearing frame (2) is placed on the rigid frame (3), again the two is pressed into together in the ground until cross shearing frame (2) surface a little less than foundation surface Fig. 5 (c); At last the soil body that comprises rigid frame (3) and cross shearing frame (2) is dug out along outline line (38) integral body, peel the soil body in the two outside off, and flat the sample saw with fret-saw along rigid frame bottom surface (39), form the sample shown in Fig. 5 (d).So just finished the sampling of site test;

Shop experiment: for fetching breadboard large volume original state sample, specimen preparation and site test are together.For reinventing sample, earlier rigid frame (3) is put into rigid frame base (7) lining, shear frame (2) be placed on rigid frame (3) above, the soil sample of required certain mass evenly is pressed in the two, so just prepared one and reinvented sample;

The obtained soil sample that comprises rigid frame (3) is put into rigid frame base (7) lining that is fixed on the boxed frame 7, and holds out against rigid frame (3), Fig. 1 with rigid frame gib screw (8);

Lever (24) is installed on the crossbeam (23), on hanging scaffold (25), adds certain counterweight (26) according to the test pressure needs;

Installation measurement equipment: on force transmitting board (9), set up displacement meter (5), measure perpendicular displacement; Direction central part on set up displacement meter (6) along cutting direction central part or force transmitting board (9) along cutting at shearing frame (2), measure shear displacemant; Pulling force sensor (13) one ends are connected on the handwheel catch bar (15), and the other end is connected on the web member (14), measures horizontal pull, and chain (12) one ends are connected on the web member (14), and the other end is connected on the chain hook (11);

Displacement meter (5), (6) and pulling force sensor (13) are connected respectively on the data-switching case, the data-switching case is connected on the microcomputer, sets the parameter of data acquisition, shakes handwheel (16) with uniform speed, shear, realize data automatic collecting in the process of the test;

After the off-test, turn pillar nut II (22) mentions the entire pressurisation equipment that comprises force transmitting board (9), force-transmitting pole (10) and lever (24), and loosening rigid frame gib screw (8) is taken out the sample that comprises rigid frame (3) and shear frame (2);

Data preparation: normal stress σ, shear stress τ on the shear surface are calculated as follows:

σ = G 1 + 24 G 2 A + σ l - - - ( 1 )

τ = T A - - - ( 2 )

Wherein: G1 is the general assembly (TW) of force transmitting board (9) and force-transmitting pole (10), and G2 is the weight of add counterweight (26), σ lBe the pressure that the lever deadweight produces sample, T is the horizontal pull that pulling force sensor (13) measures, and A is the shear surface area.

The technical solution adopted for the present invention to solve the technical problems: (1) sampling mode: a. is when doing site test, in the testing ground, earlier a rigid frame is imbedded in the ground, when treating that rigid frame is imbedded to ground surface, cross shearing frame is placed on the rigid frame, again the two is pressed into together in the ground until cross shearing frame table face a little less than foundation surface, at last the soil body integral body that comprises rigid frame and shearing frame is dug out, peel the soil body in the two outside off, and flat with fret-saw the bottom surface soil sample saw of rigid frame, finish the sampling of undisturbed soil.Such sampling method is less to the disturbance of sample.B. when doing shop experiment, for fetching breadboard large volume original state sample, method of preparing sample is identical with site test; For reinventing sample, earlier rigid frame is put in the rigid frame base, shear frame be placed on rigid frame above, the soil sample of required certain mass is pressed in the two, so just prepared one and reinvented sample.

(2) method of testing: the obtained at the scene soil sample that comprises rigid frame is put in the rigid frame base, and the rigid frame base is fixed on the boxed frame.By being installed in portable vertical loading system on the boxed frame, adopt the stretch-draw of flexible strand chain to shear frame then, sample is cut.The process of the test of shop experiment is identical with site test.In the process of the test, sample can not be subjected to the restriction of flexible strand chain at the volume of vertical direction.This test instrument principle is simple, and is easy and simple to handle, can measure the on-the-spot soil body and indoor original state sample apace, reinvent the shearing strength of sample.Package unit can be packed in the box frame, convenient in carrying.

The invention has the beneficial effects as follows: 1) equipment set is simple in structure, and is easy to operate, is easy to carry; 2) overcome of the influence of the conventional direct shear test rigidity contact friction force that shear box produced, can truly reflect the volume change situation the when soil body is cut test result; 3) site test can wholely be taken a sample, and disturbance is less, directly and easily measures the soil strength parameter; 4) have the advantage of scene, indoor dual-purpose concurrently; 5) adopt portable vertical loading system to apply vertical force, guarantee that pressure at right angle can be not eccentric in the process of the test.

Four. description of drawings

Fig. 1 is the structural representation of portable field and indoor dual-purpose direct shear test instrument;

Fig. 2 is the floor map of portable field and indoor dual-purpose direct shear test instrument;

Fig. 3 is the side schematic view of portable field and indoor dual-purpose direct shear test instrument;

Fig. 4 is the roller system synoptic diagram of portable field and indoor dual-purpose direct shear test instrument;

Fig. 5 is the sampling process synoptic diagram of site test.

Fig. 6 reinvents the peak value shear stress of the indoor direct shear test of sand and the graph of a relation of pressure at right angle.

Reference numeral: 1. sample, 2. shear frame, 3. rigid frame, 4. rigid frame base, 5. vertical displacement meter, 6. horizontal displacement meter, 7. boxed frame, 8. rigid frame gib screw, 9. force transmitting board, 10. force-transmitting pole, 11. chains hook, 12. chains, 13. pulling force sensor, 14. web members, 15. handwheel catch bars, 16. handwheel, 17. handwheel set bolts, 18. crossbeam pillars, 19. the lever bearing, 20. fulcrum end caps, 21. pillar nut I, 22. pillar nut II, 23. crossbeams, 24. levers, 25. hanging scaffold, 26. counterweights, 27. bolts, 28. " ten " cabinet frame in the shearing frame, 29. pillars, 30. roller system (see figure 4)s, 31. rolling wheel guide rails, 32. rollers, 33. roller bearings, 34. ram, 35. nuts, 36. fix, the bolt of bottom roller guide rail, 37. sampling box needs the soil body that digs out outward, the sample lines of 38. whole samplings, 39. rigid frame bottom surfaces.

Five. embodiment

The present invention will be further described in conjunction with the accompanying drawings.

As Fig. 1 to Fig. 5, portable field of the present invention and indoor dual-purpose direct shear test instrument comprise that mainly sampling equipment (shear frame (2) and rigid frame (3)), horizontal stretch-draw cut system's (chain (12), handwheel (16), pulling force sensor (13) etc.), movable type vertical loading system (roller system (30), crossbeam pillar (18), crossbeam (23), pillar (29), force transmitting board (9), force-transmitting pole (10), lever (24) etc.) and boxed frame (7), rigid frame base (4) and displacement measurement equipment (vertical displacement meter (5), horizontal displacement meter (6)).The sample that to get or put into rigid frame base (4) at the scene at the sample of indoor preparation, apply certain vertical load by the portable vertical loading system that is installed on the boxed frame (7), shake handwheel (16), shear frame (2) by chain (12) stretch-draw, in the shear history, vertical loading system and the same moved further of shearing frame (2) guarantee that pressure at right angle can be eccentric in the shear history.

Above-mentioned shearing frame (2) is the square box of cross (28), like this can be so that sample strain in shear history does not have should changing to evenly of cross shearing frame; Two chains hooks (11) are arranged on one side of shearing frame (2), horizontal displacement meter (6) is equipped with in its central authorities, for the test of doing cohesive soil and fine sand, the dead size of shearing frame (2) is: length * wide=141mm * 141mm, height is 20mm, for doing the bigger earth and stone material test of grain diameter, its size can suitably be amplified; Described rigid frame (3) dead size and shearing frame

(2) identical, outside four faces in the two lower end are edge of a knife shape, and rigid frame (3) is placed in the rigid frame base (4), and fixing with screw (8), rigid frame base (4) is fixed on the boxed frame (7) again.

The lower end of the force-transmitting pole (10) in the above-mentioned portable vertical loading system is fixed on the force transmitting board (9), the center of the two is on same vertical line, and the center line of the two is by the center of sample (1), the bed-plate dimension of force transmitting board (9) is identical with the planar dimension of shearing frame (2), vertical displacement meter (5) is equipped with on the top of force transmitting board (9), the other end of force-transmitting pole (10) is connected with fulcrum end cap (20) with lever (24) by lever bearing (19), pillar (29) has screw thread, its lower end snail is advance fulcrum end cap (20) lining, and it is fixing with pillar nut I (21), pillar (29) upper ends is in the center pit of crossbeam (23), and can move up and down, so just can make force transmitting board (9), force-transmitting pole (10) is adjusted height in vertical direction as required up and down, height control well after, pillar (29) is fixed on the crossbeam (23) by pillar nut II (22), crossbeam (23) is supported by two crossbeam pillars (18), and it is fixing by nut (35), crossbeam pillar (18) other end has screw thread, its spiral shell is advance ram (34) lining, ram (34) is enclosed within outside the rolling wheel guide rails (31), on rolling wheel guide rails (31) has, following two, the bottom roller guide rail is fixed on the boxed frame (7), and the two ends of two rolling wheel guide rails (31) are by on fixing, the bolt of bottom roller guide rail (36) is fixing.Rolling wheel guide rails is long to be 40cm, guarantees that ram (34) has the moving displacement of 5cm thereon.The design feature of vertical loading system like this is: because the force of rolling friction of roller is very little, in the sample shear history, shearing mobile force transmitting board (9), force-transmitting pole (10), lever (24), crossbeam (23), crossbeam pillar (18), ram (34), the roller (32) of can driving of frame (2) moves together, so just realized shearing in the shear history frame (2) and the same moved further of vertical loading system, guaranteed that vertical force can be not eccentric in the process of the test.

It is two steel link chains or wire rope (replacing with chain here) that chain in the system (12) is cut in above-mentioned horizontal stretch-draw, and every is about 15cm, and an end of two chains (12) is connected on the chain hook of shearing on the frame (2) (11); The other end of two chains is connected on the end of web member (14), the steel annulus of this end for rotating freely; The other end of web member (14) is by being threaded on the pulling force sensor (13), and the other end of pulling force sensor (13) is connected with the handwheel catch bar (15) with screw thread, and handwheel (16) is connected with handwheel catch bar (15).Rotate handwheel (16), handwheel catch bar (15) can advance or retreat.Handwheel (16) is identical with the handwheel of conventional indoor direct shear apparatus, and it is fixed on the boxed frame (7) by handwheel set bolt (17).

Described vertical displacement meter (5), horizontal displacement meter (6) are sensor device, and the former contact is set up on the force transmitting board (9), the perpendicular displacement of test sample in process of the test; The latter's contact is set up in shear direction and shears positive central part of frame (2) or the positive central part of shear direction force transmitting board (9), the shear displacemant of test sample in process of the test.

Be combined in indoorly to reinventing the test that sand is done, the operation steps and the sampling and testing step of this portable field and indoor dual-purpose direct shear test instrument are as follows:

Specimen preparation: earlier rigid frame (3) is put into rigid frame base (7) lining, and hold out against rigid frame (3) with rigid frame gib screw (8), shear again frame (2) be placed on rigid frame (3) above, the sand of required certain mass (1963g) evenly is pressed in the two, has so just prepared a sand sample of reinventing;

Lever (24) is installed on the crossbeam (23), on hanging scaffold (25), adds counterweight (26) according to the test pressure needs;

Installation measurement equipment: on force transmitting board (9), set up displacement meter (5), measure perpendicular displacement; Direction central part on set up displacement meter (6) along cutting direction central part or force transmitting board (9) along cutting at shearing frame (2), measure shear displacemant; Pulling force sensor (13) one ends are connected on the handwheel catch bar (15), and the other end is connected on the web member (14), measures horizontal pull, and chain (12) is connected on the web member (14) and chain is linked up with on (11);

Displacement meter (5), (6) and pulling force sensor (13) are connected on the data-switching case, the data-switching case is linked on the microcomputer, sets the parameter of data acquisition, shakes handwheel (16) with certain speed (4 rev/mins), shear, realize data automatic collecting in the process of the test;

After the off-test, turn pillar nut II (22) mentions the entire pressurisation equipment that comprises force transmitting board (9), force-transmitting pole (10) and lever (24), loosening rigid frame gib screw (8), and taking-up comprises rigid frame (3), shears frame (2) and sand sample;

Data preparation: normal stress σ, shear stress τ on the shear surface are calculated as follows:

σ = G 1 + 24 G 2 A + σ l - - - ( 1 )

τ = T A - - - ( 2 )

Shearing strength τ f is that cohesion c and angle of internal friction are represented by intensity index, is obtained by following formula:

τ f=c+σtanφ (3)

Wherein: G1 is the general assembly (TW) 2.5kg of force transmitting board (9) and force-transmitting pole (10), and G2 is the weight of add counterweight (26), σ lBe the pressure 23.8kPa that lever (24) deadweight produces sample, T is the horizontal drawing power that pulling force sensor (13) is measured, and A is shear surface area 200cm2.This sand is done four groups of tests altogether, and the quality G2 of added counterweight (26) is not for being: 4.25kg, 2.125kg, 1.275kg, 0kg calculate corresponding pressure at right angle according to formula (1) and are respectively: 75kPa, 50kPa, 40kPa, 25kPa; On the shear surface of surveying under corresponding pressure at right angle the peak value pulling force T of gained be respectively: 1000N, 712N, 545N, 360N calculate according to formula (2) that corresponding peaks shear stress is respectively on the shear surface: 50kPa, 35.6kPa, 27.25kPa, 18kPa.Draw the graph of a relation of peak value shear stress and pressure at right angle, as Fig. 6, intensity index that must this sand by formula (3) is: c=0 ,=34.3o.

For site test, sampling method is: select comparatively smooth place in the testing ground, a rigid frame 3 is imbedded in the ground Fig. 5 (a) earlier; When treating that rigid frame is imbedded to foundation surface, Fig. 5 (b), with the rigid frame Outboard Sections, promptly the soil body in (37) digs out; Cross shearing frame (2) is placed on the rigid frame (3), again the two is pressed into together in the ground until cross shearing frame (2) surface a little less than foundation surface Fig. 5 (c); At last the soil body that comprises rigid frame (3) and cross shearing frame (2) is dug out along outline line (38) integral body, peel the soil body in the two outside off, and flat the sample saw with fret-saw along rigid frame bottom surface (39), form the sample shown in Fig. 5 (d), so just finished the sampling of site test.The method of testing of on-the-spot sample is with above-mentioned indoor to reinvent the sand method of testing identical.In fetching breadboard large volume original state sample, specimen preparation and method of testing are identical with on-the-spot sample.

Claims (4)

1. portable field and indoor dual-purpose direct shear test instrument, comprise sampling equipment, vertical loading system, it is characterized in that it comprises that also horizontal stretch-draw cut system, wherein sampling equipment is formed with rigid frame (3) by shearing frame (2), shearing frame (2) places the top of rigid frame (3), vertical loading system is portable, wherein two crossbeam pillars (18) are fixedly connected on respectively on two rams (34) of roller system (30), roller system is by two rolling wheel guide rails (31), roller (32) and ram (34) are formed, two rollers (32) are embedded in the U type groove of rolling wheel guide rails (31), roller bearing (33) is connected roller (32) with ram (34), the end that two chains (12) in the system are cut in horizontal stretch-draw is connected on the chain hook of shearing on the frame (2) (11), the other end is connected on the steel annulus of web member (14) one ends, the other end of web member (14) is by being threaded on the pulling force sensor (13), the other end of pulling force sensor (13) is connected with the handwheel catch bar (15) with screw thread, handwheel (16) is connected with handwheel catch bar (15), handwheel catch bar (15) can advance or retreat when rotating handwheel (16), horizontal stretch-draw is cut system and is fixed on the boxed frame (7) by second bolt (17), the lower end of the force-transmitting pole (10) in the vertical loading system is fixed on the force transmitting board (9), the center of the two is on same vertical line, and the center line of the two is by the center of sample (1), the bed-plate dimension of force transmitting board (9) is identical with the planar dimension of shearing frame (2), vertical displacement meter (5) is equipped with on the top of force transmitting board (9), the other end of force-transmitting pole (10) is connected with fulcrum end cap (20) with lever (24) by lever bearing (19), the end of lever (24) is hanging scaffold (25), the hanging scaffold lower end is counterweight (26), pillar (29) has screw thread, its lower end snail is advance fulcrum end cap (20) lining, and it is fixing with pillar nut I (21), pillar (29) upper ends is in the center pit of crossbeam (23), and can move up and down, so just can make force transmitting board (9), force-transmitting pole (10) is adjusted height in vertical direction as required up and down, height control well after, pillar (29) is fixed on the crossbeam (23) by pillar nut II (22), crossbeam (23) is supported by two crossbeam pillars (18), and it is fixing by nut (35), crossbeam pillar (18) other end has screw thread, its spiral shell is advance ram (34) lining, ram (34) is enclosed within outside the rolling wheel guide rails (31), on rolling wheel guide rails (31) has, following two, the bottom roller guide rail is fixed on the boxed frame (7), and the two ends of two rolling wheel guide rails (31) are fixing by first bolt (36).
2. portable field according to claim 1 and indoor dual-purpose direct shear test instrument, it is characterized in that described shearing frame (2) is the square box of " ten " font frame (28), two chains hooks (11) are arranged on one side of shearing frame (2), and its central part has set up horizontal displacement meter (6); Described rigid frame (3) dead size is identical with shearing frame (2), outside four faces in the two lower end are edge of a knife shape, rigid frame (3) is placed in the rigid frame base (4), fixing with rigid frame gib screw (8), rigid frame base (4) uses the 3rd bolt (27) to be fixed on the boxed frame (7) again.
3. portable field according to claim 1 and indoor dual-purpose direct shear test instrument is characterized in that the chain (12) that described horizontal stretch-draw is cut in the system is two steel link chains or wire rope, and every is about 15cm.
4. method of using described portable field of claim 2 and indoor dual-purpose direct shear test instrument to carry out sampling and testing is characterized in that the sampling and testing step is as follows:
A. specimen preparation
A. site test: select comparatively smooth place in the testing ground, earlier a rigid frame (3) is imbedded in the ground, when treating that rigid frame is imbedded to foundation surface, some soil bodys of rigid frame Outboard Sections are dug out; To shear frame (2) is placed on the rigid frame (3), again the two is pressed into together in the ground until shearing frame (2) surface a little less than foundation surface, at last the soil body that comprises rigid frame (3) and shearing frame (2) is dug out along outline line (38) integral body, peel the soil body in the two outside off, and flat the sample saw with fret-saw along rigid frame bottom surface (39), so just finished the sampling of site test;
B. shop experiment: for fetching breadboard large volume original state sample, specimen preparation and site test are together, for reinventing sample, earlier rigid frame (3) is put into rigid frame base (4) lining, shear frame (2) be placed on rigid frame (3) above, the soil sample of required certain mass evenly is pressed in the two, has so just prepared one and reinvented sample;
B. the obtained soil sample of shearing frame (2) and rigid frame (3) that comprises is put into rigid frame base (4) lining that is fixed on the boxed frame (7), and holds out against rigid frame (3) with rigid frame gib screw (8);
C. lever (24) is installed on the crossbeam (23), on hanging scaffold (25), adds certain counterweight (26) according to the test pressure needs;
D. installation measurement equipment: on force transmitting board (9), set up vertical displacement meter (5), measure perpendicular displacement; Direction central part on set up horizontal displacement meter (6) along cutting direction central part or force transmitting board (9) along cutting at shearing frame (2), measure shear displacemant; Pulling force sensor (13) one ends are connected on the handwheel catch bar (15), and the other end is connected on the web member (14), measures horizontal pull, and chain (12) one ends are connected in the last other end of web member (14) and are connected on the chain hook (11);
E. vertical displacement meter (5), horizontal displacement meter (6) and pulling force sensor (13) are connected respectively on the data-switching case, again the data-switching case is connected on the microcomputer, set the parameter of data acquisition, shake handwheel (16) with uniform speed, shear, realize data automatic collecting in the process of the test;
F. after the off-test, turn pillar nut II (22) mentions the entire pressurisation equipment that comprises force transmitting board (9), force-transmitting pole (10) and lever (24), and loosening rigid frame gib screw (8) is taken out the sample that comprises rigid frame (3) and shear frame (2);
G. data preparation: normal stress σ, shear stress τ on the shear surface are calculated as follows:
σ = G 1 + 24 G 2 A + σ l - - - ( 1 )
τ = T A - - - ( 2 )
Wherein: G 1Be the general assembly (TW) of force transmitting board (9) with force-transmitting pole (10), G 2Be the weight of adding counterweight (26), σ 1Be the pressure that the lever deadweight produces sample, T is the horizontal pull that pulling force sensor (13) measures, and A is the shear surface area.
CN2007100253804A 2007-07-26 2007-07-26 Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method CN101105433B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2007100253804A CN101105433B (en) 2007-07-26 2007-07-26 Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2007100253804A CN101105433B (en) 2007-07-26 2007-07-26 Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method

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