CN111307509A - Red bed soft rock undisturbed sample sampling device and sampling method - Google Patents
Red bed soft rock undisturbed sample sampling device and sampling method Download PDFInfo
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- CN111307509A CN111307509A CN202010292928.7A CN202010292928A CN111307509A CN 111307509 A CN111307509 A CN 111307509A CN 202010292928 A CN202010292928 A CN 202010292928A CN 111307509 A CN111307509 A CN 111307509A
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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
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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Abstract
The invention discloses a red bed soft rock undisturbed sample sampling device and a sampling method, wherein the sampling device comprises a device base, a bearing platform is arranged on the device base, and a support frame is erected above the bearing platform; the device also comprises a movable sampling component positioned above the bearing platform, and the movable sampling component comprises a sample die and a lead screw for adjusting the vertical position of the die, wherein the lead screw comprises a lead screw supporting seat and a lead screw, the lead screw supporting seat is fixed with the top of the supporting frame, and the bottom of the lead screw is detachably connected with the sample die; the bottom of the sample mold is serrated. The sampling method comprises the following steps: coating vaseline in the sample mold, fixing the relatively flat soft rock on a bearing platform, and quickly rotating a screw rod to embed sawteeth at the bottom of the sample mold into the soft rock; then slowly rotating the screw rod to enable the mold to be vertically embedded into the soft rock, and lifting the sample mold to be separated from the soft rock after the mold penetrates through the soft rock; and (5) disassembling the sample die, taking out the soft rock sample, and sealing with wax. The device can obviously reduce the disturbance of stress history to the rock sample, and simple and convenient ground obtains complete original state appearance at the scene.
Description
Technical Field
The invention relates to a red bed soft rock undisturbed sample sampling device and a sampling method, and belongs to the field of rock mechanics and rock engineering.
Background
The preparation of a rock sample is the first work before the rock mechanical test, most of the time, a drilling machine is adopted in a laboratory, then a cylindrical sample is prepared through a grinding machine, red-layer soft rock is extremely soft rock formed by debris deposition, the appearance of the red-layer soft rock is mainly toned with red, mainly argillaceous siltstone, shale and mudstone are obtained, and the compressive strength of the red-layer soft rock is less than 30 MPa; moreover, the rock is strong in hydrophilicity and weak in water permeability, and is easy to expand or soften when meeting water, and is easy to shrink or disintegrate after losing water, and in the sampling process, the clay content of soft rock is large, so that a sample is difficult to take out. In the civil engineering test at present, do not have the instrument of special original state appearance of getting to the red layer soft rock, the quality of the rock specimen of getting is difficult for guaranteeing. Therefore, a sampling device which has a simple structure, a reasonable design, a low investment cost and a simple operation and can reduce the disturbance of stress history to the rock sample is needed, and the original sample can be taken on site to keep the lithology of the rock sample.
The utility model discloses a soft rock original state appearance device of getting is disclosed in patent application No. CN201810294504.7, the device is to the sample of shallow layer soft rock, through removing the load wagon, adopts the electric actuator sample, but does not consider in the red layer soft rock because clay content is higher, viscidity is big, the problem of taking out the soft rock sample hardly in the sampling process, be difficult to keep the normal position characteristic of soft rock to only can take out cylindrical original state appearance, device cost is higher, should not promote.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a red bed soft rock undisturbed sample sampling device and a method for sampling a red bed soft rock undisturbed sample by using the device, aiming at the problems that the undisturbed sample is difficult to take out and the original position characteristic of the sampling is difficult to maintain due to the fact that stress history greatly disturbs the rock sample in the soft rock sampling process in the prior art.
The technical scheme is as follows: the invention relates to a red bed soft rock undisturbed sample sampling device, which comprises a device base, wherein a bearing platform for fixing a soft rock sample is arranged on the device base, and a support frame is erected above the bearing platform; the device also comprises a movable sampling component which is positioned above the bearing platform and fixed with the support frame, wherein the movable sampling component comprises a sample mold for drilling an original sample and a lead screw for adjusting the vertical position of the mold, the lead screw comprises a lead screw supporting seat and a lead screw, the lead screw supporting seat is fixed with the top of the support frame, the bottom of the lead screw is detachably connected with the top of the sample mold, and the sample mold does not rotate along with the lead screw; the bottom of the sample mold is in a zigzag shape and is used for preliminarily fixing the soft rock sample.
The support frame can comprise a steel frame, lateral supports are fixedly arranged on two sides of the steel frame, and the steel frame and the lateral supports are respectively fixed with the device base.
Preferably, the sample mold is formed by splicing at least two columnar mold plate sheets, and reinforcing iron sheets are installed at the splicing positions of the adjacent mold plate sheets. Furthermore, the outer side surface of the reinforcing iron sheet at the lower part of the sample mold is an inclined surface, and the width of the inclined surface is gradually reduced from top to bottom, so that a guiding force can be formed when the sample mold enters the soft rock sampling process. In order to avoid the deformation of the sample mould caused by stress in the sampling process, a rubber protective sleeve is preferably sleeved outside the sample mould.
Preferably, the bottom of the screw rod is provided with a cap head, a horizontal chute is arranged at the joint of the cap head and the screw rod, and steel balls are arranged in the horizontal chute, so that the screw rod can freely rotate in the cap head, and the cap head can be ensured not to rotate along with the screw rod; the pressure head is installed at sample mould top, and this pressure head and cap head fixed connection because the cap head does not rotate along with the lead screw, can not rotate along with the lead screw with its fixed pressure head and sample mould, avoid the rotatory problem that can only get the cylinder appearance of sample mould among the sampling process. The handle can be installed on the top end of the screw rod, so that the screw rod can rotate conveniently.
Preferably, the bearing platform is provided with a groove for accommodating the soft rock sample, soft rock fixing components are respectively arranged on two sides of the groove, each soft rock fixing component comprises a clamping plate for clamping the soft rock sample, a rotating screw horizontally arranged and used for adjusting the horizontal position of the clamping plate, one end of the rotating screw is screwed into the bearing platform on the corresponding side of the groove, a steel ball is movably arranged at the end part of the other end of the rotating screw, and the clamping plate and the steel ball are fixed in surface and can rotate along with the steel ball to change the clamping angle. Preferably, the soft rock fixing component further comprises a hand wheel for fixing the rotary screw, and when the rotary screw is rotated to a required position, the hand wheel is rotated to fix the rotary screw and prevent the position of the rotary screw from changing under pressure.
The method for taking the undisturbed sample of the red-bed soft rock by using the sampling device comprises the following steps:
s1, placing the red-bed soft rock undisturbed sample sampling device to a sampling site, and smearing a lubricant inside a sample mold;
s2, taking a soft rock sample with a flat site, fixing the soft rock sample on a bearing platform, and quickly rotating a screw rod to embed sawteeth at the bottom of a sample mold into the soft rock sample;
s3, slowly rotating the screw rod to enable the sample mold to be vertically embedded into the soft rock sample under the rotating pressure, rapidly and reversely rotating the screw rod after the bottom of the sample mold penetrates through the soft rock sample, and lifting the sample mold until the part above the sawteeth is separated from the soft rock sample;
and S4, separating the sample mold from the bottom of the screw rod, then releasing the soft rock sample from the bearing platform, taking down the sample mold, taking out the soft rock sample from the sample mold, and sealing with wax.
Has the advantages that: compared with the prior art, the invention has the advantages that: the sampling device can obviously reduce the disturbance of stress history to the rock sample, and can simply and conveniently obtain a complete original sample on site; simultaneously, only can acquire the cylinder appearance with the rotatory sample of current sampling device and compare, the device except can acquiring the cylinder appearance, can also acquire the original state appearance of other arbitrary shapes, can make the many samples of needs of indoor soft rock experiment better.
Drawings
FIG. 1 is a schematic structural diagram of an undisturbed sample sampling device for red bed soft rock according to the invention;
FIG. 2 is a schematic structural view of a sample mold;
FIG. 3 is a schematic view of the assembly of a sample mold formed by the splicing of two mold sheets;
FIG. 4 is a schematic view of the assembly of the soft rock fixing member with the bearing platform;
fig. 5 is a schematic sectional view of the cap head.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Referring to fig. 1-5, the undisturbed red bed soft rock sample sampling device comprises a device base 1, wherein a bearing platform 2 for fixing a soft rock sample is arranged on the device base, and a support frame is erected above the bearing platform.
The supporting frame can comprise a steel frame 3, a top plate can be arranged at the top of the steel frame 3, and the bottom of the steel frame 3 can be fixed with the device base 1 in a bolt connection mode and the like; lateral supports 31 are fixedly arranged on two sides of the steel frame 3, so that the lateral stability of the device is ensured; the lateral support 31 may also be fixed to the device base 1 by means of a screw connection or the like.
Offer the recess 21 that is used for holding soft rock sample on the cushion cap 2, soft rock fixed part is installed respectively to this recess 21 both sides, this soft rock fixed part includes splint 22 and the rotatory screw 23 of level setting, as figure 4, this rotatory screw 23 one end screw in the cushion cap 2 of recess corresponding side for adjust splint 22 horizontal position, other end tip movable mounting has steel ball 24, splint 22 and this steel ball 24 fixed surface, steel ball 24 rotates, splint 22 alternate the centre gripping angle thereupon, thereby can better centre gripping anomalous soft rock sample. The soft rock fixing component further comprises a hand wheel 25, when the rotary screw 23 rotates to a required position, the hand wheel 25 is rotated, so that the rotary screw 23 can be fixed, the soft rock can be better fixed by the clamping plate 22, and the position change of the soft rock under pressure is prevented.
The upper part of the bearing platform 2 is provided with a movable sampling component which comprises a sample mould 4 and a screw rod.
The sample die 4 is used to drill a green sample. The sample mold 4 is formed by splicing at least two cylindrical mold sheets 41, and fig. 3 illustrates a sample mold structure in which the two mold sheets 41 of the upper mold half and the lower mold half are spliced by bolts 42. In order to increase the strength of the splicing part of the sample mould and avoid the stress deformation of the splicing part, reinforcing iron sheets can be arranged at the splicing part of the adjacent mould plate sheets; the outer side surface of the reinforcing iron sheet at the lower part of the sample mold 4 is an inclined surface, and the width of the inclined surface is gradually reduced from top to bottom, so that a guiding force can be formed when the sample mold enters a soft rock sampling process; as shown in fig. 2, thicker rectangular iron sheets 43 are welded to both sides of the upper 3/4 portion of the sample mold 4 for reinforcement, and about 20 bolts are used for fixation, and triangular iron sheets 44 are welded to both sides of the bottom at the lower 1/4 portion of the mold for reinforcement. The bottom of the sample mold 4 is serrated 45, which facilitates the initial fixation of the sampling device. In order to avoid the deformation of the sample mold 4 caused by the force during the sampling process, it is preferable to sleeve the sample mold 4 with a rubber protective sleeve 46.
The screw is used to adjust the vertical position of the sample mold 4. The lead screw includes lead screw supporting seat 6 and lead screw 5, and lead screw supporting seat 6 is fixed with the support frame top, and is concrete, 3 top mountable roofs of steel framework, and lead screw supporting seat 6 can be fixed in the roof in the nested. The top end of the screw rod 5 can be provided with a handle 51, so that the screw rod 51 can rotate conveniently. The bottom of the screw rod 5 is provided with a cap head 7, as shown in fig. 5, a horizontal chute 71 is arranged at the joint of the cap head 7 and the screw rod 5, a steel ball 72 is arranged inside the horizontal chute 71, the diameter of the steel ball 72 is equal to the depth of the chute 71, and the bottom end of the screw rod 5 can slide on the surface of the steel ball 72, so that the screw rod 5 can freely rotate in the cap head 7, and the cap head 7 can be ensured not to rotate along with the screw rod 5. The top of the sample mold 4 is welded with a pressure head which comprises a lower pressure head 48 and an upper pressure head 47, and the upper pressure head 47 is detachably connected with the bottom of the screw rod 5; cap 7 and pressure head fixed connection, if can set up threaded rod 49 above last pressure head 47, make sample mould 4 and cap 7 pass through threaded rod 49 and be connected fixedly, because cap 7 does not rotate along with lead screw 5, can not rotate along with lead screw 5 with its fixed pressure head and sample mould 4, avoid the rotatory problem that can only get the cylinder appearance of sample mould among the sampling process.
The undisturbed sample sampling method adopting the undisturbed sample sampling device for the red soft rock comprises the following steps:
s1, placing the red bed soft rock undisturbed sample device to the site by using a small cart, taking a soft rock sample 8 which is relatively flat on the site, rotating the hand wheel 25 and the screw 23, and stably placing the soft rock sample 8 at the middle position of the bearing platform 2 by rotating the clamping plate 22;
s2, smearing lubricant (such as vaseline) inside the die plate 41, assembling the sample die 4, installing the sample die in the upper pressure head 47, rapidly rotating the screw pitch handle 51 on the lead screw 5, and embedding the sawteeth 45 at the bottom of the sample die 4 into the soft rock sample 8;
s3, slowly rotating the screw rod 5 to enable the sample mold 4 to be vertically embedded into the soft rock sample 8 under the rotating pressure, rapidly and reversely rotating the screw rod 5 after the bottom of the sample mold 4 penetrates through the soft rock sample 8, and lifting the sample mold 4 until the part above the sawtooth 45 is separated from the soft rock sample 8;
s4, separating the sample mold 4 from the bottom of the screw rod 5, then releasing the soft rock sample 8 embedded with the sample mold 4 from the bearing platform 2, and taking down the sample mold 4; the mold slab 41 of the sample mold 4 was disassembled, and the soft rock sample was taken out from the sample mold 4 and wax-sealed.
Claims (10)
1. A red bed soft rock undisturbed sample sampling device is characterized by comprising a device base, wherein a bearing platform used for fixing a soft rock sample is arranged on the device base, and a support frame is erected above the bearing platform; the device comprises a support frame, a bearing platform and a movable sampling component, wherein the movable sampling component is positioned above the bearing platform and fixed with the support frame, and comprises a sample mold for drilling an original sample and a lead screw for adjusting the vertical position of the mold; the bottom of the sample mold is serrated and is used for preliminarily fixing the soft rock sample.
2. The undisturbed sample sampling device for red soft rock of claim 1 wherein the support frame comprises a steel frame, lateral supports are fixedly mounted on two sides of the steel frame, and the steel frame and the lateral supports are respectively fixed with the device base.
3. The undisturbed sample sampling device for red soft rock of claim 1 wherein the sample mold is formed by splicing at least two cylindrical mold plates, and a reinforced iron sheet is arranged at the splicing position of the adjacent mold plates.
4. The undisturbed sample sampling device for red soft rock of claim 3 wherein the outer side surface of the reinforcing iron sheet at the lower part of the sample mold is an inclined surface, and the width of the inclined surface is gradually reduced from top to bottom.
5. The undisturbed sample sampling device for red soft rock of claim 1 wherein the sample mold is externally sleeved with a rubber protective sleeve.
6. The undisturbed sample sampling device for red soft rock of claim 1 wherein a cap is mounted at the bottom of the screw rod, a horizontal chute is arranged at the joint of the cap and the screw rod, and steel balls are arranged in the horizontal chute to enable the screw rod to rotate freely in the cap; and a pressure head is arranged at the top of the sample mould and is fixedly connected with the cap head.
7. The undisturbed sample sampling device for red soft rock of claim 1 wherein a handle is mounted on the top of the screw mandrel.
8. The undisturbed sample sampling device for red soft rock of claim 1, wherein the bearing platform is provided with a groove for accommodating the soft rock sample, soft rock fixing parts are respectively arranged at two sides of the groove, the soft rock fixing parts comprise a clamping plate for clamping the soft rock sample, a horizontally arranged rotating screw rod for adjusting the horizontal position of the clamping plate, one end of the rotating screw rod is screwed into the bearing platform at the corresponding side of the groove, a steel ball is movably arranged at the end part of the other end of the rotating screw rod, and the clamping plate and the steel ball are fixed on the surface and can change the clamping angle along with the rotation of the steel ball.
9. The undisturbed sample sampling device of red bed soft rock of claim 8 wherein the soft rock mounting means further includes a hand wheel for mounting a rotary screw.
10. A method for taking undisturbed rock samples of red-bed soft rock by using the sampling device as claimed in claim 1, which is characterized by comprising the following steps:
s1, placing the red-bed soft rock undisturbed sample sampling device to a sampling site, and smearing a lubricant inside a sample mold;
s2, taking a soft rock sample with a flat site, fixing the soft rock sample on a bearing platform, and quickly rotating a screw rod to embed sawteeth at the bottom of a sample mold into the soft rock sample;
s3, slowly rotating the screw rod to enable the sample mold to be vertically embedded into the soft rock sample under the rotating pressure, rapidly and reversely rotating the screw rod after the bottom of the sample mold penetrates through the soft rock sample, and lifting the sample mold until the part above the sawteeth is separated from the soft rock sample;
and S4, separating the sample mold from the bottom of the screw rod, then releasing the soft rock sample from the bearing platform, taking down the sample mold, taking out the soft rock sample from the sample mold, and sealing with wax.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010292928.7A CN111307509A (en) | 2020-04-15 | 2020-04-15 | Red bed soft rock undisturbed sample sampling device and sampling method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010292928.7A CN111307509A (en) | 2020-04-15 | 2020-04-15 | Red bed soft rock undisturbed sample sampling device and sampling method |
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| CN111307509A true CN111307509A (en) | 2020-06-19 |
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Cited By (2)
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| CN114199647A (en) * | 2021-12-13 | 2022-03-18 | 四川大学 | Rock mass in-situ stress curing method and curing system |
| CN117250068A (en) * | 2023-11-20 | 2023-12-19 | 华侨大学 | Soft rock sample preparation equipment and sample preparation method thereof |
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Application publication date: 20200619 |