CN204758436U - Test device of simulated formation mud infiltration - Google Patents
Test device of simulated formation mud infiltration Download PDFInfo
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- CN204758436U CN204758436U CN201520477147.XU CN201520477147U CN204758436U CN 204758436 U CN204758436 U CN 204758436U CN 201520477147 U CN201520477147 U CN 201520477147U CN 204758436 U CN204758436 U CN 204758436U
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- mud
- coupon
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- becket
- pipe
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Abstract
The utility model provides a simulated formation mud permeability test device includes at least that coupon, water pipe, water storage box, mud pipe puddle the box, and water tank and mud pipe be through the coupon intercommunication, and the coupon is connected the water tank through the becket and is puddled the pipe, having seted up the helicla flute on the inner wall of becket, being equipped with the loaded filter in the becket, the loaded filter closely inlays in the helicla flute of locating the becket through the sealing washer, being equipped with 2 above holes along the axial on the pipe wall of coupon and pressing sensors and 2 above TDR probes, each hole presses sensor and each TDR to pop one's head in respectively evenly distributed on two axis that are parallel to each other of coupon pipe wall, is equipped with horizontal scale along the axial on the surface of coupon pipe wall, is equipped with horizontal installation's transparent viewing window in the pipe wall of coupon, the utility model provides a simulated formation mud permeability test device can truly be simulated mud and permeate the condition that forms the mud skin in the soil body of stratum, simple structure, and sealing performance is good.
Description
Technical field
The utility model relates to a kind of test unit for studying slurry penetration stratum formation mud skin in cast-in-situ bored pile, belongs to civil engineering work testing equipment technical field.
Background technology
Cast-in-situ bored pile is one of the most frequently used base form of science of bridge building, but due to cast-in-situ bored pile be underground and also in water pore-forming, in addition forming hole method is different, the factors such as the various changes of geologic condition, very easily there is various defect in cast-in-situ bored pile, thus impacts the whole service life of bridge.Show that the quality of slurry coat method quality will directly have influence on the load-carrying properties of pile foundation to a great extent through various theoretical research and engineering practice.In mud engineering, the essence of mud effect is the equilibrium problem of mud pressure and stratum soil water pressure.For the Flooding in Borehole that infiltration coefficient is lower, slurry penetration enters in stratum, and surface of stratum forms fine and close mud skin or mud skin and permeable belt, forms two osmotic resistance with original place layer, common equilibrium mud pressure thus reach the effect of retaining wall.Therefore need to study the situation of infiltrating soil layer under the effect of different pressures for mud.And mostly be with reference to drilling mud API filtration about slurry coat method matter quantifier elimination now, but API filtration is under the 690kPa pressure differential of regulation, test 240ml mud in 30min by the filter loss of the permeating medium of certain area, therefore a kind of mud only has an API filtration, the quality of mud itself can only be reflected, and can accurately as the index evaluating mud infiltration situation in the earth formation.Main in engineering reality or the engineering experience of foundation technician at present, therefore be necessary that combination model test is simulated slurry coat method in corresponding ground environment, permeated the situation forming mud skin, understand the mechanism of slurry penetration film forming, analyze mud skin anti-permeability performance, thus provide foundation for the preparation of mud and the control of mud pressure.
Summary of the invention
The purpose of this utility model be to solve the deficiencies in the prior art and provide a kind of structure simple, can the test unit of real simulation stratum slurry penetration situation.
Realizing the technical scheme that the utility model object adopts is, a kind of test unit of simulated formation slurry penetration, at least comprise the coupon of horizontal positioned, the water pipe of vertical placement, to be positioned at below water pipe and with the water storage box of cross current, the mud tube of vertical placement be positioned at the mud box be communicated with below mud tube and with mud tube, water tank is communicated with by coupon with mud tube, coupon connects water tank and mud tube by becket, the inwall of described becket offers helicla flute, be provided with in becket vertically place by screen cloth, porous plate and the geotechnological loaded filter formed of weaving cotton cloth, screen cloth and geotechnique weave cotton cloth lay respectively at porous plate two survey and contact with the both ends of the surface of porous plate, loaded filter is closely embedded in the helicla flute of becket by O-ring seal, the tube wall of coupon is provided with vertically more than 2 sensor for pore water pressures and more than 2 TDR probes, each sensor for pore water pressure and each TDR probe are uniformly distributed on coupon tube wall two axis be parallel to each other respectively.
The outside surface of described coupon tube wall is provided with horizontal scale vertically, and be provided with the transparent windows that level is installed in the tube wall of coupon, the length of transparent windows is 1/2 ~ 1 times of coupon length.
The connecting pipe A being communicated with water pipe and water storage box is provided with by-pass valve control A, and the top of water pipe is provided with air pressure valve A, and the end of water storage box is provided with inlet valve, and water storage box is communicated with external water source by inlet valve.
The connecting pipe B being communicated with mud tube and mud box is provided with by-pass valve control B, and the top of mud tube is provided with air pressure valve B, and the end of mud box is provided with slurry-inlet valve door, and mud box is communicated with outside mud source by slurry-inlet valve door.
The parallel probe of described TDR probe three of being packaged in epoxy resin overcoat by epoxy resin overcoat and end is formed, probe is connected with concentric cable by connecting wire, probe is all arranged in epoxy resin overcoat with the junction being connected wire with the junction connecting wire and concentric cable, and the other end of concentric cable is connected with electromagnetic wave receiver with electromagnetic wave excites device respectively.
Described coupon is cylindrical shape, and the tube wall of coupon is provided with vertically 6 sensor for pore water pressures and 6 TDR probes, each sensor for pore water pressure is relative with the position that each TDR pops one's head in.
As shown from the above technical solution, the test unit of the simulated formation slurry penetration that the utility model provides, by coupon joining water box and mud tube, soil sample is loaded in coupon, for topsoil in analog, water tank is by external water source or the water pipe water supply being positioned at top, for simulate formation water environment, mud tube is by outside mud source or the mud tube confession slurry being positioned at top, for providing infiltration mud, mud permeates and forms mud skin in the soil body, the sensor for pore water pressure that coupon is installed and the seepage distance of TDR probe for measuring mud, speed and hole pressure distribution, in conjunction with seepage flow and the relation curve of time, can know mud Percolation Law and analyze mud skin formed overall process, coupon connects water tank and mud tube by becket, becket makes between coupon and water storage box and between coupon and mud box, compact siro spinning technology is tightly connected gap, place simultaneously, ensure the sealing of whole test unit, whole developmental tube cross section all can touch mud when pressurizeing and permeate, can actual conditions in construction simulation process, be convenient to again dismantle the mud skin formed after taking out infiltration simultaneously, loaded filter is provided with in becket, inwall offers helicla flute, loaded filter is fixed in becket by helicla flute is stable, loaded filter is made up of being weaved cotton cloth by screen cloth, porous plate and geotechnique of vertically placing, screen cloth and porous plate are for stopping the loss of bulky grain soil sample, geotechnique weaves cotton cloth for stopping that the loss of fine grained soil sample does not affect the flowing of water simultaneously, and the gap between loaded filter and becket closed by O-ring seal, avoids soil sample to run off.
Coupon surface is provided with transparent windows vertically and indicates horizontal scale, the length of transparent windows is 1/2 ~ 1 times of coupon length, directly can be observed the infiltration situation of mud in whole coupon by transparent windows, mud infiltration situation in the earth formation can be judged roughly by horizontal scale.In device, each container (water pipe, water storage box, mud tube, mud box and developmental tube) is all provided with valve, wherein air pressure valve A and air pressure valve B is used for coupon both sides inflating pressure, the seepage pressure of simulation when stratum different depth, by-pass valve control A and by-pass valve control B is respectively with opening the flow controlling water and mud, inlet valve is used for external water source and supplies water, and slurry-inlet valve door is used for outside mud source for slurry.
Each sensor for pore water pressure is relative with the position that each TDR pops one's head in, namely the sensor for pore water pressure that position is relative and TDR probe are positioned on the same vertical section of coupon, therefore the infiltration situation of the mud of same vertical section soil layer and hole pressure be can obtain simultaneously, the slurry penetration distance of the soil body in whole coupon, speed and hole pressure distribution are convenient to obtain; TDR probe connects electromagnetic wave excites device and electromagnetic wave receiver, for detecting the transmission of data by concentric cable; .
Compared with prior art, the test unit of the simulated formation slurry penetration that the utility model provides, the situation forming mud skin can be permeated by real simulation mud in ground layer soil body, the retaining wall stability of research mud formation, in process of the test, simulate the soil body condition of Different Strata by changing soil layer particle composition, grating, particle size, pore character etc. in coupon; The seepage pressure when stratum different depth simulated by air pressure valve by Control Assay pipe both sides; By engineering reality need simulated ground environment after, can constantly change or adjust the formula of mud, according to the anti-permeability performance etc. of mud moisture penetration distance in the earth formation, hole pressure distribution, mudcake thickness and mud skin, determine the best preparation program of slurry coat method in this stratum, have the penetration mechanism of mud, Penetration Signature and be further familiar with, for the preparation of slurry coat method provides reference frame, for the stability of cast-in-situ bored pile pile foundation provides technical support.
Accompanying drawing explanation
The structural representation of the test unit of the simulated formation slurry penetration that Fig. 1 provides for the utility model.
Fig. 2 is the longitudinal section of coupon.
Fig. 3 is the structural representation of TDR probe.
Wherein, 1-water pipe, 2-mud tube, 3-coupon, 4-water storage box, 5-mud box, 6-sensor for pore water pressure, 7-TDR pops one's head in, 8-screen cloth, 9-porous plate, 10-geotechnique weaves cotton cloth, 11-air pressure valve A, 12-air pressure valve B, 13-by-pass valve control A, 14-inlet valve, 15-by-pass valve control B, 16-slurry-inlet valve door, 17-freeing port, 18-stock inlet, 19-becket, 20-horizontal scale, 21-transparent windows, 22-O-ring seal, 23-connects wire, 24-probe, 25-concentric cable, 26-epoxy resin overcoat.
Embodiment
Carry out detailed specific description below in conjunction with drawings and Examples to the utility model, content of the present utility model is not limited to following examples.
The test unit of the simulated formation slurry penetration that the utility model provides, its structure as shown in Figure 1, comprise the coupon 3 of horizontal positioned, the water pipe 1 of vertical placement, to be positioned at below water pipe and with the water storage box 4 of cross current, the mud tube 2 of vertical placement be positioned at the mud box 5 be communicated with below mud tube and with mud tube, water tank is communicated with by coupon with mud tube, the connecting pipe A being communicated with water pipe and water storage box is provided with by-pass valve control A13, the top of water pipe is provided with air pressure valve A11, the end of water storage box is provided with freeing port 17, freeing port is provided with inlet valve 14, water storage box is communicated with external water source by freeing port, the connecting pipe B being communicated with mud tube and mud box is provided with by-pass valve control B15, the top of mud tube is provided with air pressure valve B12, the end of mud box is provided with stock inlet, stock inlet is provided with slurry-inlet valve door 16, mud box is communicated with outside mud source by stock inlet, coupon connects water tank and mud tube by becket 19, the inwall of described becket offers helicla flute, be provided with in becket vertically place by screen cloth 8, the loaded filter of porous plate 9 and geotechnological 10 formations of weaving cotton cloth, screen cloth and geotechnique weave cotton cloth lay respectively at porous plate two survey and contact with the both ends of the surface of porous plate, loaded filter is closely embedded in the helicla flute of becket by O-ring seal 22,
Described coupon is cylindrical shape, as shown in Figure 2, the tube wall of coupon is provided with vertically 6 sensor for pore water pressures 6 and 6 TDR probes 7, each sensor for pore water pressure and each TDR probe are uniformly distributed on coupon tube wall two axis be parallel to each other respectively in the horizontal direction, each sensor for pore water pressure is relative with the position that each TDR pops one's head in, the sensor for pore water pressure that position is relative and TDR probe are positioned on the same vertical section of coupon, the structure of TDR probe as shown in Figure 3, the parallel probe 24 of TDR probe three of being packaged in epoxy resin overcoat by epoxy resin overcoat 26 and end is formed, probe is connected with concentric cable 25 by connecting wire 23, probe is all arranged in epoxy resin overcoat with the junction being connected wire with the junction connecting wire and concentric cable, the other end of concentric cable is connected with electromagnetic wave receiver with electromagnetic wave excites device respectively, the outside surface of coupon tube wall is provided with horizontal scale 20 vertically, the transparent windows 21 that level is installed is provided with in the tube wall of coupon, the length of transparent windows is 1/2 ~ 1 times of coupon length.
During installation, coupon is rotated to surface level scale close to ground simultaneously but look squarely still observable reading, judge roughly mud infiltration situation in the earth formation by horizontal scale.
Claims (6)
1. the test unit of a simulated formation slurry penetration, at least comprise the coupon of horizontal positioned, the water pipe of vertical placement, to be positioned at below water pipe and with the water storage box of cross current, the mud tube of vertical placement be positioned at the mud box be communicated with below mud tube and with mud tube, water tank is communicated with by coupon with mud tube, it is characterized in that: coupon connects water tank and mud tube by becket, the inwall of described becket offers helicla flute, be provided with in becket vertically place by screen cloth, porous plate and the geotechnological loaded filter formed of weaving cotton cloth, screen cloth and geotechnique weave cotton cloth lay respectively at porous plate two survey and contact with the both ends of the surface of porous plate, loaded filter is closely embedded in the helicla flute of becket by O-ring seal, the tube wall of coupon is provided with vertically more than 2 sensor for pore water pressures and more than 2 TDR probes, each sensor for pore water pressure and each TDR probe are uniformly distributed on coupon tube wall two axis be parallel to each other respectively.
2. the test unit of simulated formation slurry penetration according to claim 1, it is characterized in that: the outside surface of described coupon tube wall is provided with horizontal scale vertically, be provided with the transparent windows that level is installed in the tube wall of coupon, the length of transparent windows is 1/2 ~ 1 times of coupon length.
3. the test unit of simulated formation slurry penetration according to claim 1, it is characterized in that: the connecting pipe A being communicated with water pipe and water storage box is provided with by-pass valve control A, the top of water pipe is provided with air pressure valve A, the end of water storage box is provided with inlet valve, and water storage box is communicated with external water source by inlet valve.
4. the test unit of simulated formation slurry penetration according to claim 1, it is characterized in that: the connecting pipe B being communicated with mud tube and mud box is provided with by-pass valve control B, the top of mud tube is provided with air pressure valve B, the end of mud box is provided with slurry-inlet valve door, and mud box is communicated with outside mud source by slurry-inlet valve door.
5. the test unit of simulated formation slurry penetration according to claim 1, it is characterized in that: the parallel probe of described TDR probe three of being packaged in epoxy resin overcoat by epoxy resin overcoat and end is formed, probe is connected with concentric cable by connecting wire, probe is all arranged in epoxy resin overcoat with the junction being connected wire with the junction connecting wire and concentric cable, and the other end of concentric cable is connected with electromagnetic wave receiver with electromagnetic wave excites device respectively.
6. the test unit of simulated formation slurry penetration according to claim 1, it is characterized in that: described coupon is cylindrical shape, the tube wall of coupon is provided with vertically 6 sensor for pore water pressures and 6 TDR probes, each sensor for pore water pressure is relative with the position that each TDR pops one's head in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520477147.XU CN204758436U (en) | 2015-06-30 | 2015-06-30 | Test device of simulated formation mud infiltration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520477147.XU CN204758436U (en) | 2015-06-30 | 2015-06-30 | Test device of simulated formation mud infiltration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204758436U true CN204758436U (en) | 2015-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520477147.XU Expired - Fee Related CN204758436U (en) | 2015-06-30 | 2015-06-30 | Test device of simulated formation mud infiltration |
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| Country | Link |
|---|---|
| CN (1) | CN204758436U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702564A (en) * | 2019-10-18 | 2020-01-17 | 郑州大学 | Horizontal type simulation stratified formation mud infiltration and soil body mechanical property change testing arrangement |
-
2015
- 2015-06-30 CN CN201520477147.XU patent/CN204758436U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702564A (en) * | 2019-10-18 | 2020-01-17 | 郑州大学 | Horizontal type simulation stratified formation mud infiltration and soil body mechanical property change testing arrangement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20210630 |