CN114062082B - Device and method for preparing undisturbed soil triaxial sample through spin-drop - Google Patents
Device and method for preparing undisturbed soil triaxial sample through spin-drop Download PDFInfo
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- CN114062082B CN114062082B CN202111363767.7A CN202111363767A CN114062082B CN 114062082 B CN114062082 B CN 114062082B CN 202111363767 A CN202111363767 A CN 202111363767A CN 114062082 B CN114062082 B CN 114062082B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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Abstract
The invention discloses a device and a method for preparing an undisturbed soil triaxial sample by spin-down, wherein the device comprises a bearing mechanism, a cutting mechanism and a supporting mechanism; the bearing mechanism comprises a base, and a leveling assembly is arranged on the base; the top end of the base is provided with a clamping device; the cutting mechanism comprises a power assembly, the bottom end of the power assembly is detachably connected with a cutterhead assembly, and the cutterhead assembly is used for cutting undisturbed soil; the supporting mechanism comprises a supporting rod group which is in sliding connection with the cutting mechanism, a lifting power component is arranged at the bottom end of the supporting rod group, and the lifting power component is fixedly arranged at the top end of the base. The invention has simple structure and simple operation method, has small influence on undisturbed soil in the cutting process, avoids the influence of uncertain factors and human factors in the cutting process, perfects the soil sampling method of undisturbed soil, and improves the accuracy of test data.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a device and a method for preparing a triaxial sample of undisturbed soil by spin-down.
Background
The design and construction of geotechnical engineering are required to be determined according to the geological conditions of engineering sites, so that the construction sites are required to be surveyed before the design and construction, the mechanical properties and stability of undisturbed soil on site are determined, the undisturbed soil triaxial sample is required to be used for measuring the mechanical properties of undisturbed soil, and the shear strength of the undisturbed soil triaxial sample under different stress paths and drainage conditions can be measured by the undisturbed soil triaxial sample triaxial compression test. When the undisturbed soil is subjected to triaxial mechanical test, the undisturbed soil body sample obtained on site is required to be prepared into a standard sample; in order to reduce the disturbance of the undisturbed soil sample by the sample preparation process, suitable sample preparation equipment, commonly referred to as a cutter or a sample preparation device, must be used.
At present, a sample preparation device in a laboratory generally adopts a cutting method of rotating a soil sample and enabling a cutter to be static, and a principle refers to a machine tool, and the method is easy to cause discrete crushing of the obtained soil sample due to high-speed rotation of the soil sample in the cutting process, so that larger deviation exists between test data and actual conditions; even if a small amount of soil sample is static and the cutter of the sample preparation device rotates, the cutting cutter of the sample preparation device is fixed, the soil sample is easy to crack due to large feeding amount in one-time direct cutting, and the cutting efficiency is low due to the fact that the cutter is frequently replaced because the cutter is fixed and cannot be adjusted for multiple times. Therefore, a need exists for a device for preparing triaxial sample of undisturbed soil by spin-down which can conveniently perform multiple cutting operations.
Disclosure of Invention
The invention aims to provide a device and a method for preparing an undisturbed soil triaxial sample by spin-down, so as to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a device for preparing a triaxial sample of undisturbed soil by spin-down, which comprises
The supporting mechanism is used for installing undisturbed soil blanks and comprises a base, and a leveling assembly is arranged on the base; the top end of the base is provided with a clamping device;
the cutting mechanism is arranged above the bearing mechanism and is used for cutting the undisturbed soil blank arranged at the top end of the clamping device; the cutting mechanism comprises a cutting power assembly, wherein the bottom end of the cutting power assembly is detachably connected with a cutterhead assembly, and the cutterhead assembly is used for cutting the undisturbed soil blank;
the supporting mechanism is arranged between the bearing mechanism and the cutting mechanism and is used for supporting the cutting mechanism and driving the cutting mechanism to move up and down; the supporting mechanism comprises a supporting rod group which is in sliding connection with the cutting mechanism, a lifting power assembly is arranged at the bottom end of the supporting rod group, and the lifting power assembly is fixedly arranged at the top end of the base.
Preferably, the base comprises a bottom plate, a top plate is fixedly connected to the top end of the bottom plate, a mounting groove is formed in the center of the top plate, and the clamping device is arranged in the mounting groove.
Preferably, the leveling assembly comprises a plurality of leveling struts and a leveling device, wherein the plurality of leveling struts are vertically fixed on the top surface of the base at equal intervals in the circumferential direction, and the top surfaces of the leveling struts are fixedly connected with the bottom surface of the top plate; the leveling device is arranged at the top end of the clamping device.
Preferably, the clamping device comprises a bearing mechanism arranged in the mounting groove and a clamping assembly fixedly arranged on the top surface of the top plate; the bearing mechanism comprises a bearing push rod fixedly arranged at the bottom end of the mounting groove, a bearing plate is fixedly connected to the output end of the bearing push rod, the bearing plate is matched with the mounting groove, and the leveling device is arranged at the top end of the bearing plate; the clamping device and the mounting groove are concentrically arranged.
Preferably, the clamping assembly comprises a fixed ring fixedly connected to the top surface of the top plate, and an adjusting ring is rotatably connected to the outside of the fixed ring; the inner cavity of the adjusting ring is provided with a plurality of arc grooves, one end of a clamping rod is connected in the arc grooves in a sliding mode, and the other end of the clamping rod extends out of the side wall of the fixing ring and is connected with the fixing ring in a sliding mode.
Preferably, the cutting power assembly comprises a power frame which is in sliding connection with the support rod group, a cutting motor is fixedly arranged at the top end of the power frame, and the output end of the cutting motor extends into the inner cavity of the power frame and is in meshed connection with a cutting ring; the cutting ring is rotationally connected with the power frame, and the bottom of the cutting ring is detachably connected with a cutter head assembly.
Preferably, the cutterhead assembly comprises a body ring detachably connected with the cutting ring, a cutting gear is rotationally connected in a ring body cavity of the body ring, a plurality of cutting tool rests are connected to the top surface of the cutting gear in a circumferential equidistant meshing manner, and the cutting tool rests are in sliding connection with the side wall of the body ring; and the end of the cutting tool rest, which faces the inner circle direction of the body ring, is fixedly connected with a cutter.
A method for preparing an undisturbed soil triaxial sample by spin-down comprises the following steps:
sampling the undisturbed soil blank and checking the internal liquid property of the undisturbed soil blank;
leveling and supporting mechanism;
clamping an undisturbed soil blank;
erecting a cutting mechanism and adjusting a cutterhead assembly;
cutting an undisturbed soil blank;
and cleaning the cuttings to obtain an undisturbed soil triaxial sample.
Preferably, in the step of cutting the undisturbed soil blank, the cutting needs to be performed in a plurality of times, each time the cutting is performed from the top end to the bottom end of the undisturbed soil blank, the cutting mechanism is lifted, and the cutter head assembly is regulated again to perform the cutting.
Preferably, in the step of cutting the undisturbed soil blank, cutting is stopped every time 1/3-1/2 of the height of the undisturbed soil blank is cut, and chips are cleaned once.
The invention discloses the following technical effects: the invention discloses a device and a method for preparing an undisturbed soil triaxial sample by spin-drop, wherein a base and a clamping device are leveled by a leveling assembly, so that the undisturbed soil triaxial sample obtained by cutting an undisturbed soil blank has high verticality, cannot be drooped and inclined, and has good test effect and high accuracy of test results; the cutting mechanism drives the cutter head assembly to rotate through the power assembly, the undisturbed soil blank fixed on the supporting mechanism is cut, the undisturbed soil blank is fixed, the cutter rotates, the influence of the cutting process on the undisturbed soil blank is reduced, and the test error of the obtained undisturbed soil triaxial sample is reduced; the cutter head assembly is convenient to adjust the cutting quantity of the cutter, convenient and quick, free from the need of disassembling and replacing the cutter and high in cutting efficiency. The invention has simple structure and simple operation method, has small influence on undisturbed soil blank in the cutting process, avoids the influence of uncertain factors and human factors in the cutting process, and improves the accuracy of test data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a three-dimensional view of a device for preparing a triaxial sample of undisturbed soil by spin-down;
FIG. 2 is a top view of the support mechanism of the present invention;
FIG. 3 is a cross-sectional view of A-A of FIG. 2;
FIG. 4 is a schematic view of a clamping device;
FIG. 5 is a three-dimensional view of the cutterhead assembly of the present invention;
FIG. 6 is a schematic view of the cutterhead assembly of the present invention;
FIG. 7 is a cross-sectional view of B-B in FIG. 6;
FIG. 8 is a schematic diagram showing the use process of the undisturbed soil triaxial sample spin-down preparation device;
FIG. 9 is a schematic view of a supporting putter in accordance with the present invention;
wherein, 1, undisturbed soil blank; 2. a base; 3. a leveling assembly; 4. clamping device; 5. a cutting power assembly; 6. a cutterhead assembly; 7. a support rod group; 8. a lifting power assembly; 21. a bottom plate; 22. a top plate; 23. a mounting groove; 31. leveling the support column; 32. a leveling device; 41. supporting the push rod; 42. a bearing plate; 43. a fixing ring; 44. an adjusting ring; 45. an arc-shaped groove; 46. a clamping rod; 51. a power rack; 52. a cutting motor; 53. a cutting ring; 61. a body ring; 62. cutting a gear; 63. a drive gear; 64. a cutting tool holder; 65. a cutter; 66. an adjustment aperture; 651. a knife handle; 652. a blade; 71. a smooth rod; 72. and (3) a screw.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to figures 1-9, the invention provides a device for preparing a triaxial sample of undisturbed soil by spin-down,
Included
the supporting mechanism is used for mounting undisturbed soil blanks 1 and comprises a base 2, and a leveling assembly 3 is arranged on the base 2; the top end of the base 2 is provided with a clamping device 4;
the cutting mechanism is arranged above the bearing mechanism and is used for cutting the undisturbed soil blank 1 arranged at the top end of the clamping device 4; the cutting mechanism comprises a cutting power assembly 5, a cutter head assembly 6 is detachably connected to the bottom end of the cutting power assembly 5, and the cutter head assembly 6 is used for cutting the undisturbed soil blank 1;
the supporting mechanism is arranged between the bearing mechanism and the cutting mechanism and is used for supporting the cutting mechanism and driving the cutting mechanism to move up and down; the supporting mechanism comprises a supporting rod group 7 which is in sliding connection with the cutting mechanism, a lifting power component 8 is arranged at the bottom end of the supporting rod group 7, and the lifting power component 8 is fixedly arranged at the top end of the base 2.
The device levels the base 2 and the clamping device through the leveling component 3, so that the undisturbed soil triaxial sample obtained by cutting the undisturbed soil blank 1 has high verticality, and can not fall and incline, so that the undisturbed soil triaxial sample has good test effect and high test result accuracy; the cutting mechanism drives the cutter head assembly 6 to rotate through the power assembly, cuts the undisturbed soil blank 1 fixed on the supporting mechanism, fixes the undisturbed soil blank 1, rotates the cutter, reduces the influence of the cutting process on the undisturbed soil blank 1, and reduces the test error of the obtained undisturbed soil triaxial sample; the cutter head assembly 6 is convenient to adjust the cutting amount of the cutter, convenient and quick, free from disassembling and replacing the cutter and high in cutting efficiency.
Further, the supporting rod set 7 comprises two smooth rods 71 fixedly connected with the base 2 and a screw 72 in transmission connection with the lifting power assembly 8, the screw 72 is in threaded connection with the lifting power assembly 8, the smooth rods 71 are in sliding connection with the cutting power assembly 5, and the lifting motion of the cutting mechanism is driven by rotation of the screw 72.
Further optimizing scheme, base 2 includes bottom plate 21, and the top rigid coupling of bottom plate 21 has roof 22, and mounting groove 23 has been seted up at the center of roof 22, and clamping device 4 sets up in mounting groove 23. When in use, the bottom plate 21 is fixed on the flat ground of a test place, and then the top plate 22 is leveled through the leveling component 3, so that the verticality of the undisturbed soil blank 1 clamped on the top plate 22 is ensured.
In a further optimized scheme, the leveling assembly 3 comprises a plurality of leveling struts 31 and leveling devices 32, wherein the plurality of leveling struts 31 are vertically fixed on the top surface of the base 2 at equal intervals in the circumferential direction, and the top surface of the leveling struts 31 is fixedly connected with the bottom surface of the top plate 22; the leveling device 32 is provided at the top end of the clamping device 4. Leveling is performed by moving a leveling post 31 between the bottom plate 21 and the top plate 22 by leveling the levelness of the clamping device 4 mounted on the top plate 22 by the leveling device 32. The working principle and the leveling method of the leveling post 31 are prior art, and are not described here in detail.
Further, the leveling device 32 includes, but is not limited to, a bubble level and a level sensor, and the working principle and the using method of the two are the prior art, and are not described herein.
Further optimizing scheme, the clamping device 4 comprises a bearing mechanism arranged in the mounting groove 23 and a clamping component fixedly arranged on the top surface of the top plate 22; the bearing mechanism comprises a bearing push rod 41 fixedly arranged at the bottom end of the mounting groove 23, a bearing plate 42 is fixedly connected to the output end of the bearing push rod 41, the bearing plate 42 is matched with the mounting groove 23, and the leveling device 32 is arranged at the top end of the bearing plate 42; the clamping device 4 and the mounting groove 23 are concentrically arranged; the clamping assembly comprises a fixed ring 43 fixedly connected to the top surface of the top plate 22, and an adjusting ring 44 is rotatably connected to the outside of the fixed ring 43; the inner cavity of the adjusting ring 44 is provided with a plurality of arc grooves 45, one end of a clamping rod 46 is connected in a sliding way in the arc grooves 45, and the other end of the clamping rod 46 extends out of the side wall of the fixing ring 43 and is connected with the fixing ring 43 in a sliding way. When in use, the top plate 22 is leveled through the leveling component 3, so that the bearing plate 42 is leveled, and the perpendicularity of the undisturbed soil blank 1 fixed on the bearing plate 42 is ensured; the distance between the two ends of the arc-shaped groove 45 and the fixed ring 43 is unequal, and the two ends of the arc-shaped groove 45 are smoothly changed; when in use, the bearing plate 42 is lifted out of the mounting groove 23 by the bearing push rod 41, then the undisturbed soil blank 1 is put on the bearing plate 42, and then the bearing plate 42 is lowered into the mounting groove 23; the adjusting ring 44 is rotated, the arc-shaped groove 45 rotates along with the adjusting ring 44, the clamping rod 46 stretches out towards the undisturbed soil blank 1 under the pushing of the arc-shaped groove 45, and finally the undisturbed soil blank 1 is clamped at the center of the bearing plate 42. The supporting rods synchronously move, so that the position of the undisturbed soil blank 1 is ensured not to deviate.
In a further optimized scheme, the cutting power assembly 5 comprises a power frame 51 which is in sliding connection with the support rod group 7, a cutting motor 52 is fixedly arranged at the top end of the power frame 51, and the output end of the cutting motor 52 extends into the inner cavity of the power frame 51 and is in meshed connection with a cutting ring 53; the cutting ring 53 is rotatably connected with the power frame 51, and the bottom end of the cutting ring 53 is detachably connected with the cutterhead assembly 6. The cutting motor 52 drives the cutting ring 53 to rotate, and then drives the cutterhead assembly 6 below the cutting ring 53 to rotate at a high speed, so that the cutting work is completed.
Further, the rotation speed of the cutting motor 52 includes a plurality of gears, and is selected according to the soil properties of the undisturbed soil blank 1.
In a further optimized scheme, the cutterhead assembly 6 comprises a body ring 61 detachably connected with a cutting ring 53, a cutting gear 62 is rotatably connected in a ring body cavity of the body ring 61, a plurality of cutting tool holders 64 are connected to the top surface of the cutting gear 62 in a circumferential equidistant meshing manner, and the cutting tool holders 64 are in sliding connection with the side wall of the body ring 61; the cutting blade holder 64 is fixedly connected with a cutter 65 toward the end of the body ring 61 in the inner circular direction. The cutting gear 62 rotates to drive the cutting tool rest 64 engaged with the top end of the cutting gear 62 to move toward the center or away from the center at the same time, thereby adjusting the position of the cutter 65 and changing the cutting diameter.
Further, an adjusting hole 66 is formed in the top end of the body ring 61, a driving gear 63 is rotatably connected to the lower end of the adjusting hole 66, the side wall of the driving gear 63 is meshed with the cutting gear 62, and the driving gear 63 is rotated by a hexagonal wrench to drive the cutting gear 62 to rotate to finish adjustment.
Further, the cutter 65 includes a handle 651, the top end of the handle 651 is fixedly connected with the cutting tool rest 64, the bottom end of the handle 651 is fixedly connected with a plurality of blades 652, the plurality of blades 652 form a ring shape, and the blades 652 have a certain angle, so that the cutting is facilitated.
A further optimization scheme of a use method of an undisturbed soil triaxial sample spin-down preparation device comprises the following steps:
the undisturbed soil blank 1 is sampled and the internal liquid properties of the undisturbed soil blank 1 are checked; and taking a soil sample of a target stratum through a special sampler to obtain an undisturbed soil blank 1, wherein the shape of the undisturbed soil blank 1 is larger than that of a final undisturbed soil triaxial sample, and enough allowance is reserved.
Leveling and supporting mechanism; the leveling post 31 is adjusted by the measurement device to level the top surface of the support plate 42 in the installation groove 23, and the verticality of the undisturbed soil blank 1 after installation is maintained.
Clamping an undisturbed soil blank 1; the bearing pushes up the supporting rod and lifts up the mounting groove 23, then puts undisturbed soil blank 1 on the bearing plate 42, then descends the bearing plate 42 into the mounting groove 23, rotates the adjusting ring 44, and the arc groove 45 rotates along with the adjusting ring 44, and the clamping rod 46 stretches out to the undisturbed soil blank 1 under the pushing of the arc groove 45, and finally clamps the undisturbed soil blank 1 at the central position of the bearing plate 42.
Erecting a cutting mechanism and adjusting a cutterhead assembly 6; the cutting structure is arranged at a certain position above the undisturbed soil blank 1, then a driving gear 63 is rotated by a hexagonal wrench to drive a cutting tool rest 64 meshed with the top end of a cutting gear 62 to move towards the center or away from the center at the same time, so that the position of a cutter 65 is adjusted, the cutting diameter is changed, and the cutting diameter is slightly smaller than the diameter of the undisturbed soil blank 1; the feed amount of the cutting is determined according to the soil property of the undisturbed soil blank 1.
Cutting the undisturbed soil blank 1; starting a cutting motor 52 to drive a cutter 65 to rotate so as to cut the outer edge of the undisturbed soil blank 1; simultaneously, the lifting power assembly 8 is started to drive the screw rod 72 to rotate, so that the cutting mechanism slowly descends until the cutter 65 cuts to a position close to the clamping device; stopping the cutting motor 52 and reversing the lifting power assembly 8 to raise the cutting structure above the top end of the undisturbed earth blank 1; the cutting diameter is reduced again and the cutting step is repeated until the diameter of the undisturbed earth blank 1 reaches the predetermined requirement.
And cleaning the cuttings to obtain an undisturbed soil triaxial sample. The crushed soil after cutting is cleaned, then the undisturbed soil blank 1 is sawed from the cutting end at the lower end, and a section is sawed above the undisturbed soil blank 1, so that the rest undisturbed soil blank 1 has the same size as the design, and the undisturbed soil triaxial sample is obtained.
In a further optimization scheme, in the step of cutting the undisturbed soil blank 1, cutting is stopped every time 1/3/-1/2/of the height of the undisturbed soil blank 1 is cut, and chips are cleaned once. Cutting is stopped at intervals, chips are cleaned, and the chips are prevented from affecting the cutting accuracy.
The undisturbed soil blank 1 is sampled and the internal liquid properties of the undisturbed soil blank 1 are checked; and taking a soil sample of a target stratum through a special sampler to obtain an undisturbed soil blank 1, wherein the shape of the undisturbed soil blank 1 is larger than that of a final undisturbed soil triaxial sample, and enough allowance is reserved.
Leveling and supporting mechanism; the leveling post 31 is adjusted by the measurement device to level the top surface of the support plate 42 in the installation groove 23, thereby making the original soil blank 1 vertical after installation.
Clamping an undisturbed soil blank 1; the supporting push rod 41 lifts the supporting plate 42 out of the mounting groove 23, then the undisturbed soil blank 1 is placed on the supporting plate 42, then the supporting plate 42 is lowered into the mounting groove 23, the adjusting ring 44 is rotated, the arc groove 45 rotates along with the adjusting ring 44, the clamping rod 46 stretches out towards the undisturbed soil blank 1 under the pushing of the arc groove 45, and finally the undisturbed soil blank 1 is clamped at the central position of the supporting plate 42.
Erecting a cutting mechanism and adjusting a cutterhead assembly 6; the cutting structure is arranged at a certain position above the undisturbed soil blank 1, then a driving gear 63 is rotated by a hexagonal wrench to drive a cutting tool rest 64 meshed with the top end of a cutting gear 62 to move towards the center or away from the center at the same time, so that the position of a cutter 65 is adjusted, the cutting diameter is changed, and the cutting diameter is slightly smaller than the diameter of the undisturbed soil blank 1; the cutting feed is determined according to the soil properties of the undisturbed soil blank.
Cutting the undisturbed soil blank 1; starting a cutting motor 52 to drive a cutter 65 to rotate so as to cut the outer edge of the undisturbed soil blank 1; simultaneously, the lifting power assembly 8 is started to drive the screw rod 72 to rotate, so that the cutting mechanism slowly descends until the cutter 65 cuts to a position close to the clamping device; stopping the cutting motor 52 and reversing the lifting power assembly 8 to raise the cutting structure above the top end of the undisturbed earth blank 1; and reducing the cutting diameter again, and repeating the cutting steps until the diameter of the undisturbed soil blank reaches the preset requirement.
And cleaning the cuttings to obtain an undisturbed soil triaxial sample. The crushed soil after cutting is cleaned, then the undisturbed soil blank 1 is sawed from the cutting end at the lower end, and a section is sawed above the undisturbed soil blank, so that the rest undisturbed soil blank 1 has the same size as the design, and the undisturbed soil triaxial sample is obtained.
In a further optimization scheme, in the step of cutting the undisturbed soil blank 1, cutting is stopped every time 1/3/-1/2/of the height of the undisturbed soil blank 1 is cut, and chips are cleaned once. Cutting is stopped at intervals, chips are cleaned, and the chips are prevented from affecting the cutting accuracy.
The using method comprises the following steps:
and taking a soil sample of a target stratum through a special sampler to obtain an undisturbed soil blank 1, wherein the shape of the undisturbed soil blank 1 is larger than that of a final undisturbed soil triaxial sample, and enough allowance is reserved.
The leveling device 32 is used for measuring, the leveling support column 31 is adjusted, the top surface of the bearing plate 42 in the mounting groove 23 is leveled, and the perpendicularity of the undisturbed soil blank 1 after being mounted is ensured.
The supporting push rod 41 lifts the supporting plate 42 out of the mounting groove 23, then the undisturbed soil blank 1 is placed on the supporting plate 42, then the supporting plate 42 is lowered into the mounting groove 23, the adjusting ring 44 is rotated, the arc groove 45 rotates along with the adjusting ring 44, the clamping rod 46 stretches out towards the undisturbed soil blank 1 under the pushing of the arc groove 45, and finally the undisturbed soil blank 1 is clamped at the central position of the supporting plate 42.
The cutting structure is arranged at a certain position above the undisturbed soil blank 1, then a driving gear 63 is rotated by a hexagonal wrench to drive a cutting tool rest 64 meshed with the top end of a cutting gear 62 to move towards the center or away from the center at the same time, so that the position of a cutter 65 is adjusted, the cutting diameter is changed, and the cutting diameter is slightly smaller than the diameter of the undisturbed soil blank 1; the feed amount of the cutting is determined according to the soil property of the undisturbed soil blank 1.
Starting a cutting motor 52 to drive a cutter 65 to rotate so as to cut the outer edge of the undisturbed soil blank 1; simultaneously, the lifting power assembly 8 is started to drive the screw rod 72 to rotate, so that the cutting mechanism slowly descends until the cutter 65 cuts to a position close to the clamping device; stopping the cutting motor 52 and reversing the lifting power assembly 8 to raise the cutting structure above the top end of the undisturbed earth blank 1; the cutting diameter is reduced again and the cutting step is repeated until the diameter of the undisturbed earth blank 1 reaches the predetermined requirement. In the cutting process, cutting is stopped at intervals, chips are cleaned, and the chips are prevented from affecting the cutting accuracy.
The crushed soil after cutting is cleaned, then the undisturbed soil blank 1 is sawed from the cutting end at the lower end, and a section is sawed above the undisturbed soil blank 1, so that the rest undisturbed soil blank 1 has the same size as the design, and the undisturbed soil triaxial sample is obtained.
The invention has simple structure and simple operation method, has small influence on the undisturbed soil blank 1 in the cutting process, avoids the influence of uncertain factors and human factors in the cutting process, and improves the accuracy of test data.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The foregoing embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all changes and modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (8)
1. The utility model provides a device is prepared to original state soil triaxial sample fall soon which characterized in that: comprising
The supporting mechanism is used for installing undisturbed soil blanks (1), and comprises a base (2), wherein a leveling assembly (3) is arranged on the base (2); the top end of the base (2) is provided with a clamping device (4);
the cutting mechanism is arranged above the bearing mechanism and is used for cutting the undisturbed soil blank (1) arranged at the top end of the clamping device (4); the cutting mechanism comprises a cutting power assembly (5), wherein a cutter head assembly (6) is detachably connected to the bottom end of the cutting power assembly (5), and the cutter head assembly (6) is used for cutting the undisturbed soil blank (1);
the supporting mechanism is arranged between the bearing mechanism and the cutting mechanism and is used for supporting the cutting mechanism and driving the cutting mechanism to move up and down; the supporting mechanism comprises a supporting rod group (7) which is in sliding connection with the cutting mechanism, a lifting power component (8) is arranged at the bottom end of the supporting rod group (7), and the lifting power component (8) is fixedly arranged at the top end of the base (2);
the cutting power assembly (5) comprises a power frame (51) which is in sliding connection with the support rod group, a cutting motor (52) is fixedly arranged at the top end of the power frame (51), and the output end of the cutting motor (52) extends into the inner cavity of the power frame (51) and is connected with a cutting ring (53) in a meshed manner; the cutting ring (53) is rotationally connected with the power frame (51), and the bottom end of the cutting ring (53) is detachably connected with the cutterhead assembly (6);
the cutter head assembly (6) comprises a body ring (61) detachably connected with the cutting ring (53), a cutting gear (62) is rotationally connected in a ring body cavity of the body ring (61), a plurality of cutting tool holders (64) are connected to the top surface of the cutting gear (62) in a circumferential equidistant meshing manner, and the cutting tool holders (64) are in sliding connection with the side wall of the body ring (61); the end of the cutting tool rest (64) facing the inner circle direction of the body ring (61) is fixedly connected with a cutter (65).
2. The undisturbed soil triaxial sample spin-down preparation device according to claim 1, wherein: the base (2) comprises a bottom plate (21), a top plate (22) is fixedly connected to the top end of the bottom plate (21), a mounting groove (23) is formed in the center of the top plate (22), and the clamping device (4) is arranged in the mounting groove (23).
3. The undisturbed soil triaxial sample spin-down preparation device according to claim 2, wherein: the leveling assembly (3) comprises a plurality of leveling struts (31) and leveling devices (32), wherein the plurality of leveling struts (31) are vertically fixed on the top surface of the base (2) at equal intervals in the circumferential direction, and the top surface of the leveling struts (31) is fixedly connected with the bottom surface of the top plate (22); the leveling device (32) is arranged at the top end of the clamping device (4).
4. The undisturbed soil triaxial sample spin-down preparation device according to claim 3, wherein: the clamping device (4) comprises a bearing component arranged in the mounting groove (23) and a clamping component fixedly arranged on the top surface of the top plate (22); the bearing assembly comprises a bearing push rod (41) fixedly arranged at the bottom end of the mounting groove (23), a bearing plate (42) is fixedly connected to the output end of the bearing push rod (41), the bearing plate (42) is matched with the mounting groove (23), and the leveling device (32) is arranged at the top end of the bearing plate (42); the clamping device (4) and the mounting groove (23) are concentrically arranged.
5. The undisturbed soil triaxial sample spin-down preparation device according to claim 4, wherein: the clamping assembly comprises a fixed ring (43) fixedly connected to the top surface of the top plate (22), and an adjusting ring (44) is connected to the outer part of the fixed ring (43) in a rotating manner; the inner cavity of the adjusting ring (44) is provided with a plurality of arc grooves (45), one end of a clamping rod (46) is connected in a sliding mode in the arc grooves (45), and the other end of the clamping rod (46) extends out of the side wall of the fixing ring (43) and is connected with the fixing ring (43) in a sliding mode.
6. A method for preparing a triaxial sample of undisturbed soil by spin-down, which is characterized by comprising the following steps:
the original soil blank (1) is sampled and the internal liquid property of the original soil blank (1) is checked;
leveling and supporting mechanism;
clamping an undisturbed soil blank (1);
erecting a cutting mechanism and adjusting a cutterhead assembly (6);
cutting an undisturbed soil blank (1);
and cleaning the cuttings to obtain an undisturbed soil triaxial sample.
7. The method for preparing the undisturbed soil triaxial sample by spin-down according to claim 6, characterized in that: in the step of cutting the undisturbed soil blank, the cutting needs to be performed in a plurality of times, each time the cutting is performed from the top end to the bottom end of the undisturbed soil blank (1), then the cutting mechanism is lifted, and the cutter head assembly (6) is adjusted again to perform cutting.
8. The method for preparing the undisturbed soil triaxial sample by spin-down according to claim 6, characterized in that: in the step of cutting the undisturbed soil blank, cutting is stopped every time 1/3-1/2 of the height of the undisturbed soil blank (1) is cut, and chips are cleaned once.
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