CN107228935B - A kind of passive pile soil arching effect experimental rig based on seepage effect - Google Patents
A kind of passive pile soil arching effect experimental rig based on seepage effect Download PDFInfo
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- CN107228935B CN107228935B CN201710570080.8A CN201710570080A CN107228935B CN 107228935 B CN107228935 B CN 107228935B CN 201710570080 A CN201710570080 A CN 201710570080A CN 107228935 B CN107228935 B CN 107228935B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a kind of passive pile soil arching effect experimental rig based on seepage effect, including passive pile pile-soil interaction simulation system and water circulation system, the passive pile pile-soil interaction simulation system includes chamber, mobile bracket, hanging basket and counterweight, soil sample and simulation stake are placed in the chamber for simulating passive pile pile-soil interaction environment, the chamber connects water circulation system, and seepage flow is simulated by the water circulation system, the chamber setting is on mobile bracket, the side of the chamber connects hanging basket, the counterweight is placed in hanging basket, and the counterweight by increasing and decreasing in the hanging basket simulates Thrust of Landslide.First passage of the present invention simulation under the conditions of anhydrous, full water, seepage flow native arch at, development, failure procedure, disclose the mechanism of the soil-water interaction in soil arching effect, the research for enriching pattern foundation pit supporting structure and slope prevention and treatment etc., the related fields supplemented with existing soil arching effect under seepage effect are theoretical.
Description
Technical field
The present invention relates to the retaining engineerings technical fields such as foundation pit, water conservancy, traffic and side slope, more particularly to one kind to be based on seepage flow
The passive pile soil arching effect experimental rig of effect.
Background technique
Passive pile is widely used in the engineering supports such as slope, slope treatment and foundation pit, the earth-retaining effect that can be played very well
The reason of fruit is soil arching effect --- uneven displacement occurs for the soil body after stake, and the Thrust in the soil body reaches pile body, simultaneously
Inter-pile soil body is compacted.Since nineteen forty-three Tai Shaji tests the presence for confirming soil arching effect by dodge gate, with ground work
Journey field is constantly deeply developed, and project data related with soil arching effect, experiment and theoretical research are also more and more.With soil
Arch is theoretical to be constantly progressive, and research achievement also gradually tries out, and is started guidance, optimization engineer application, is obtained good application
Effect.
Soil arching effect theoretical developments so far, have achieved many outstanding achievements, positive guidance are also played to engineering practice
Effect, but still there are many be worth further investigated the problem of.First, being " form " of soil arch, including arch, arch are thick, arch springing
Shape etc..Second, be the influence of water, in many geological disasters, engineering accident, such as landslide failure, the failure of foundation pit bracing, all
Have with water compared with Important Relations.Soft of soil caused by the adverse effect of the water such as seepage flow, piping, earth structure strength reduce, same meeting
Weaken soil arching effect, limits the performance of passive pile earth-retaining function.
Currently, the research about soil arching effect primarily rests on continuous uniform medium, and the soil body is substantially a kind of non-
Continuously, heterogeneous bulk solid.Meanwhile in the past in the research about Seepage problems, it is mostly based on continuous medium hypothesis, directly
The effect of seepage force is added on the continuous soil body and is analyzed.The actual conditions that this is only flowed in soil body hole with fluid are not
Symbol, for considering that the penetration mechanism of soil particle and water phase interaction has compared with big limitation.When seepage flow occurs, can usually cause tight
The seepage erosion of weight, i.e. stream soil and piping.When failure by piping occurs, the fine grained soil in the soil body is pulled away with water flow, soil skeleton hair
It is raw to destroy；Also, when fine grained soil moves in bulky grain hole with water, may silting hole, can then be generated at silting compared with
Big penetration, leads to damage of soil body.Influence due to water to the soil body is huge and the mechanism of action is complicated, need to study in full water emphatically
And the soil arching effect under the conditions of seepage flow.
Summary of the invention
In view of this, the influence the embodiment provides a kind of seepage flow of research for the first time to soil arching effect, improves soil
The passive pile soil arching effect experimental rig based on seepage effect of arching research.
The embodiment of the present invention provides a kind of passive pile soil arching effect experimental rig based on seepage effect, including passive pile
Pile-soil interaction simulation system and water circulation system, the passive pile pile-soil interaction simulation system include chamber, mobile bracket, hang
Basket and counterweight, the chamber is interior to place soil sample and simulation stake for simulating passive pile pile-soil interaction environment, the chamber company
The water receiving circulatory system, and seepage flow is simulated by the water circulation system, the chamber setting is on mobile bracket, the test
The side of case connects hanging basket, and the counterweight is placed in hanging basket, and the counterweight by increasing and decreasing in the hanging basket simulates Thrust of Landslide.
Further, the water circulation system includes water tank, bracket, bucket and water pump, and the water tank is located on bracket, described
Bracket it is height-adjustable, water inlet, water outlet and overflow port are provided on the water tank, the water inlet is connected to water by water pump
Water in bucket is pumped into water tank, the side of the overflow port connection test case, by described by water inlet by bucket, the water pump
Overflow port spilling water into chamber simulates seepage flow, and the bucket is placed below the other side of chamber, the water outlet connection
Bucket.
Further, the chamber includes cover, and a upper side of the cover is equipped with inlet channel, the cover it is another
Side bottom is equipped with water outlet, and the side of close inlet channel is equipped with ejector dozer in the cover, close water outlet in the cover
Side is equipped with filter plate, and breast boards is equipped between the filter plate and ejector dozer, and the simulation stake is located at breast boards and ejector dozer
Between, the soil sample is placed between breast boards and ejector dozer, and the water flowed out from the overflow port is followed by inlet channel, soil-shifting
Plate, soil sample, simulation stake and breast boards simulate seepage flow, and the water flowed out from the breast boards is after filter plate from water outlet stream
Out, and entering in bucket, the outside of the ejector dozer is equipped with force transmission shaft, dynamometer and steering shaft wheel, and the two of the steering shaft wheel
End is wound with hawser, and the horizontal direction of the hawser connects force transmission shaft, and the vertical direction of the hawser connects hanging basket, in the hanging basket
Middle placement counterweight, the quality of the dynamometer measurement counterweight, the hanging basket moves straight down, and pulls force transmission shaft by hawser
Thrust is passed to soil sample and simulation stake simulation Thrust of Landslide in turn by Level Promoting ejector dozer, the ejector dozer.
Further, transparent cover plate is covered with above the cover, the top of the transparent cover plate is equipped with photographing device, described
Photographing device shoots the surface variation of soil sample, and the force transmission shaft connects displacement meter, and the displacement of the displacement meter monitoring soil sample is described
Pressure cell and osmometer, the internal stress field of the pressure cell monitoring soil sample are embedded in soil sample, the osmometer monitors soil sample
Inside seepage field, the side of the cover is equipped with sealing cable hole and switchable gas vent, the pressure cell and osmometer
Data line be pierced by by sealing cable hole, the residual gas in chamber is discharged by opening the gas vent.
Further, it is provided with water hole on the ejector dozer and breast boards, and is covered with gauze, the centre of the cover is set
There is sealing rubber circle, the outside of the force transmission shaft is equipped with sealing ring, and the water outlet includes the first lateral road, the first perpendicular road, the second cross
Road and the second perpendicular road, first lateral road are located at the lower section of chamber, the upper end flush of second lateral road and chamber, institute
It states the first lateral road, the first perpendicular road, the second lateral road and the second perpendicular road to be sequentially communicated, bucket, institute are placed in the lower section in the second perpendicular road
It states inlet channel and is equipped with valve, be equipped with valve below the first perpendicular road and the second perpendicular road.
Compared with prior art, the invention has the following advantages: first passage simulation is in anhydrous, full water, seepage flow item
Under part native arch at, development, failure procedure, disclose the mechanism of the soil-water interaction in soil arching effect, enrich slope prevention and treatment side
The research in face, it is theoretical supplemented with the water-related aspect of existing soil arching effect.
Detailed description of the invention
Fig. 1 is an a kind of schematic diagram of the passive pile soil arching effect experimental rig based on seepage effect of the present invention.
Fig. 2 is a schematic diagram of chamber in Fig. 1.
Fig. 3 is the side view of chamber in Fig. 1.
Fig. 4 is a kind of experiment flow figure of the passive pile soil arching effect experimental rig based on seepage effect of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Referring to FIG. 1, the embodiment provides a kind of, the passive pile soil arching effect based on seepage effect tests dress
It sets, including passive pile pile-soil interaction simulation system 1 and water circulation system 2.
Passive pile pile-soil interaction simulation system 1 includes chamber 11, mobile bracket 12, hanging basket 13 and counterweight 14, the examination
Soil sample (not shown) and simulation stake 117 are placed in tryoff 11 for simulating passive pile pile-soil interaction environment, the chamber
11 settings are on mobile bracket 12, and the side of the chamber 11 connects hanging basket 13, and the counterweight 14 is placed in hanging basket 13, and
Thrust of Landslide is simulated by the counterweight 14 increased and decreased in the hanging basket 13.
Chamber 11 connects water circulation system 2, and simulates seepage flow by the water circulation system 2, and water circulation system 2 includes
Water tank 21, bracket 22, bucket 23 and water pump 24, the water tank 21 are located on bracket 22, the bracket 22 it is height-adjustable.
Water inlet 211, water outlet 212 and overflow port 213 are provided on water tank 21, the water inlet 211 is connected by water pump 24
Water in bucket 21 is pumped into water tank 21, the connection of overflow port 213 examination by water inlet 211 by water flowing bucket 21, the water pump 24
The side of tryoff 11, by the overflow port 213, into chamber 11, spilling water simulates seepage flow, and the bucket 23 is placed on chamber
Below 11 other side, the water outlet 211 is connected to bucket 23.
Fig. 2 and Fig. 3 are please referred to, chamber 11 includes cover 111, and the centre of cover 111 is equipped with sealing rubber circle 1111, cover
111 top is covered with transparent cover plate (not shown), and the top of the transparent cover plate is equipped with photographing device (not shown),
The side of the cover 111 is equipped with sealing cable hole (not shown) and switchable gas vent (not shown), described
One upper side of cover 111 is equipped with inlet channel 112, and another side bottom of the cover 111 is equipped with water outlet 113, the cover
It is equipped with ejector dozer 114 close to the side of inlet channel 112 in 111, was equipped in the cover 111 close to the side of water outlet 113
Filter plate 115.
Water outlet 112 includes the first lateral road 1121, the first perpendicular road 1122, the second lateral road 1123 and the second perpendicular road 1124, institute
The lower section that the first lateral road 1121 is located at chamber 11 is stated, the upper end flush of second lateral road 1123 and chamber 11 is described
First lateral road 1121, the first perpendicular road 1122, the second lateral road 1123 and the second perpendicular road 1124 are sequentially communicated, the second perpendicular road 1124
Lower section place bucket 23, enable water flow horizontal homogeneous seepage flow, be convenient to clean draining, the first perpendicular road 1122 and second erects
The lower section in road 1124 is equipped with valve 1125, and the inlet channel 113 is equipped with valve 1125,
Breast boards 116 is equipped between filter plate 115 and ejector dozer 114, simulation stake 117 is located at breast boards 116 and ejector dozer
Between 114, soil sample is placed between breast boards 116 and ejector dozer 114, and pressure cell (not shown) and infiltration are embedded in soil sample
The data line of pressure meter (not shown), the pressure cell and osmometer is pierced by by sealing cable hole, in one embodiment, institute
It states and is provided with water hole 1141 on ejector dozer 114 and breast boards 116, and be covered with gauze (not shown), can effectively prevent
Soil sample exudation, while guaranteeing that water flow can be uniformly through.
The outside of ejector dozer 114 is equipped with force transmission shaft 118, dynamometer 119 and steering shaft wheel 120, and the force transmission shaft 118 connects
The outside of displacement meter 122, force transmission shaft 118 is equipped with sealing ring 1181, and the both ends of steering shaft wheel 120 are wound with hawser 121, the hawser
121 horizontal direction connects force transmission shaft 118, and the vertical direction of the hawser 121 connects hanging basket 13, places in the hanging basket 13
Counterweight 14, the dynamometer 119 measure the quality of counterweight 14.
The water flowed out from overflow port 213 is followed by inlet channel 112, ejector dozer 114, soil sample, simulation stake 117 and breast boards
116 simulation seepage flow.
Counterweight 14 is placed into hanging basket 13, the specific quality of counterweight 14 is measured by dynamometer 119, with the increasing of counterweight 14
Add hanging basket 13 to move straight down, and 118 Level Promoting ejector dozer 114 of force transmission shaft, the ejector dozer are pulled by hawser 121
Thrust is passed to soil sample and the simulation simulation Thrust of Landslide of stake 117 in turn by 114.
In test, the residual gas in chamber 11 is discharged by opening the gas vent, photographing device shoots soil sample
Surface variation, displacement meter 122 monitors the displacement of soil sample, the internal stress field of pressure cell monitoring soil sample, the osmometer
Monitor the inside seepage field of soil sample.
After test, flows out, go forward side by side from water outlet 113 after the filtering of filter plate 115 from the water flowed out in the breast boards 116
Enter in bucket 23.
Referring to FIG. 4, a kind of experimental method of the passive pile soil arching effect experimental rig based on seepage effect is as follows:
S1. great soil group to be studied is chosen, prepares soil sample, and measure the mechanics index of physics of soil sample；The great soil group includes soil
Sample, clay and silt, the mechanics index of physics of the soil sample include natural density, dry density, grain density, infiltration coefficient, glue
Poly- power, angle of friction, effective cohesion intercept and effective angle of friction；In one embodiment, great soil group to be studied selects soil sample, takes partial size
0.5mm-2mm coarse sand group is prepared into the soil sample that porosity is 0.7 and is tested, and measures its physico-mechanical properties: density, friction
Angle, infiltration coefficient etc..
S2. type, shape, size and the stake spacing of stake 117 are simulated in design experiment case 11；The simulation stake 117
Type includes embedment stake and cantilever pile, the shape of the simulation stake 117 include it is rectangular and round, other shapes also may be used；It should be noted
117 size of stake and stake spacing are simulated, if stake spacing is excessive, pile body is undersized, may cause soil arch can not be formed, and between stake
Away from too small, pile body is oversized, and soil arch bearing capacity can be made to greatly reinforce, so that soil arch failure procedure can not be studied.
In one embodiment, embedment stake is selected in simulation stake 117, simulates 117 pile body of stake having a size of 10 × 10cm square pile, length
For 30cm, stake spacing is 35cm.
S3. the step S1 soil sample prepared is filled in simulation passive pile pile-soil interaction environment in chamber 11, and in soil sample
In bury pressure cell or osmometer；
Soil sample is tested when anhydrous, and closely knit soil sample is loaded in layering in chamber 11, it is ensured that soil sample filling is uniform, soil sample
In bury pressure cell, stand 8h after seal；
Soil sample is tested in full water or seepage flow, side layering filling soil sample, marginal not water, buries pressure cell and osmotic pressure in soil sample
Meter seals after standing 12 hours.
In one embodiment, soil sample is tested when anhydrous, the uniform densification of every filling 10cm thickness soil sample, in guarantee test case 11
Soil sample is evenly distributed as much as possible, and notices that the amount of banketing keeps soil sample porosity 0.7 in chamber, when filling soil sample inside soil sample
Even arrangement pressure cell, while paying attention to pressure cell cabling, it avoids leading to test failure because cabling is improper, soil sample has been filled in chamber
Bi Houxu stand 8 hours release soil sample internal stress, rear seal-cover, transparent cover plate can be covered, be arranged on transparent cover plate and take pictures
Equipment, the variation on photographing device shooting soil sample surface；
Soil sample is tested in full water or seepage flow, when filling soil sample, need to successively be filled the water, while pressure is evenly arranged inside soil sample
Power box and osmometer monitor soil sample internal water pressure, and Yu Zeyu soil sample is tested identical when anhydrous；
S4. it is further applied load to soil sample and simulates Thrust of Landslide, load is realized by applying counterweight 14 in hanging basket 13, establishes water
The circulatory system 2 simulate seepage flow, and by pressure cell, displacement meter 122 and osmometer monitor respectively stress everywhere in soil sample, displacement with
And pore water pressure variation, establish soil sample internal stress field, surface-displacement and seepage field；
S5. change soil sample water environment, repeat step S4, and under analysis of control difference water environment soil sample internal stress
Field, surface-displacement and seepage field, understand formation, development, failure procedure and the water of soil arching effect in influence wherein；
Soil sample is tested when anhydrous, after applying level-one load to soil sample, observes the data of pressure cell, until after data stabilization
Apply next stage load, be constantly further applied load step by step, and record monitoring data, until larger position occurs for soil sample in chamber 11
It moves, local failure, closes pressure cell, remove the load of application, and porosity, every level-one is measured by sampling in the different location of soil sample
Load is 10kg, is subject to the measurement of dynamometer 119.
Soil sample is tested in full water or seepage flow, after applying level-one load to soil sample, starts water pump, applies second level lotus to soil sample
After load, 112 valve of inlet channel of chamber 11, and the height of the data point reuse water tank 21 according to osmometer, then the row of opening are opened
Residual gas in chamber 11 is discharged, and closes gas vent by stomata, is gradually increased water and enters the flow velocity of chamber 11 to setting
Constant current is fast, after the data stabilization of displacement meter 122, pressure cell and osmometer, applies next stage load, and records the water outlet of chamber 11
The water flow velocity that road 113 flows out, when the data of pressure cell monitoring are in reduction trend, the data speedup that displacement meter 122 monitors is in become larger
When trend, soil arch has failed, and stops test, first closes pressure cell and osmometer, stops water circulation system, close chamber 11 into
112 valve of water channel opens the valve of gas vent and chamber water outlet 113, flows out the water in chamber 11, in chamber 11
Porosity is measured by sampling in different location behind water outflow part in soil sample.
S6. change type, shape, size and the stake spacing for simulating stake 117 in chamber 11, repeat step S3-S5, point
Analyse it is different simulation stakes 117 under the conditions of seepage flow to native arch at, development, failure mechanism of action；
S7. soil sample is replaced, step S2-S6 is repeated, probes into the soil arching effect under different great soil group environment.
This example simulates soil arching effect under 0.45m (i.e. soil sample length after stake) head and higher seepage velocity, and
Anhydrous, full water bar part is contrasted.
In anhydrous conditions, initial loading starts, and load is applied to soil sample via force transmission shaft 118, ejector dozer 114, bulldozes
Plate 114 pushes soil sample to move forward, and pressure is gradually transferred in soil sample and simulation stake 117, and inside soil body stress increases, and simulates stake
117 undertake load greater than inside soil body stress and amplification it is bigger, native arch at；It is further increased with load, ejector dozer 114 is displaced
Increase, amplification is small than before, and simulation stake 117 undertakes load and is still greater than inside soil body stress, but the two speedup is almost the same, soil
Arch further gradually reinforce by development, soil arching effect；When load increase to a certain extent when soil arching effect reach maximum, bulldoze later
Plate 114 is displaced amplification and increases, and simulation stake 117 undertakes load reduction, and soil arch is in failure stage；But as ejector dozer 114 is displaced
It further increases, soil arch is formed again, and simulation stake 117 undertakes load, but small compared with most preceding undertaken load peak value；Test carries out
When, start with load, ejector dozer 114 pushes soil sample, after stake the soil body due to simulation stake stop it is compacted, between stake and thereafter the soil body to
Preceding movement, between stake and there is uneven displacement in the soil body after being greater than stake of land movement thereafter, the soil body；Inside soil body stress transfer is extremely
Pile body, native arch is at soil arch arch body region is compacted；Portion's soil body is forced to do one's bidding since soil encircles arch body behind arch, and displacement is less than between stake and stake
The preceding soil body.
Under the conditions of full water and seepage flow, the formation of soil arch, development, failure regularity with it is anhydrous when it is almost the same, but with dampening
Head increases, i.e., osmotic pressure increases, and the load peak value that simulation stake 117 is born reduces, while land movement increases；In loading procedure
In, it is in reduction trend that osmometer records water pressure mostly, this is because soil sample is gradually compacted before breast boards, soil sample permeability becomes
Difference, head loss become larger.And the soil body and soil sample centre local location after stake, i.e. soil arch arch springing, arch are in, stress is concentrated, native
Body is more closely knit compared with other positions, and water body is lockable and can not drain in hole, and pore water pressure increases instead.Further, with
Native roach exhibition, failure, while water pressure is excessive, leads to the local soil body particle changing of the relative positions, and water body, which is taken advantage of a situation, in hole drains, water pressure
It reduces, thus osmometer detection data in part is fluctuated in overall reduction trend.
First passage of the present invention simulation under the conditions of anhydrous, full water, seepage flow native arch at, development, failure procedure, disclose
The mechanism of soil-water interaction in soil arching effect enriches the research of slope prevention and treatment aspect, supplements existing soil arching effect and water phase
It is theoretical to close aspect.
Herein, the nouns of locality such as related front, rear, top, and bottom are to be located in figure with components in attached drawing and zero
Part mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the noun of locality
Use should not limit the claimed range of the application.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of passive pile soil arching effect experimental rig based on seepage effect, which is characterized in that including passive pile pile-soil interaction
Simulation system and water circulation system, the passive pile pile-soil interaction simulation system include chamber, mobile bracket, hanging basket and match
Weight, on mobile bracket, the water circulation system includes water tank, bracket, bucket and water pump, the water tank for the chamber setting
Be located on bracket, the bracket it is height-adjustable, water inlet, water outlet and overflow port, the water inlet are provided on the water tank
Mouth is connected to bucket by water pump, and the water in bucket is pumped into water tank, the overflow port connection test by water inlet by the water pump
The side of case, by the overflow port, into chamber, spilling water simulates seepage flow, and the bucket is placed under the other side of chamber
Side, the water outlet are connected to bucket, and the chamber includes cover, and a upper side of the cover is equipped with inlet channel, the cover
Another side bottom of body is equipped with water outlet, is equipped with ejector dozer close to the side of inlet channel in the cover, close in the cover
The side of water outlet is equipped with filter plate, and breast boards is equipped between the filter plate and ejector dozer, and the simulation stake is located at breast boards
Between ejector dozer, soil sample is placed between breast boards and ejector dozer, from the overflow port flow out water followed by inlet channel,
Ejector dozer, soil sample, simulation stake and breast boards simulate seepage flow, and the water flowed out from the breast boards is after filter plate from water outlet
Road outflow, and enter in bucket, the outside of the ejector dozer is equipped with force transmission shaft, dynamometer and steering shaft wheel, the steering shaft wheel
Both ends be wound with hawser, the horizontal direction of the hawser connects force transmission shaft, and the vertical direction of the hawser connects hanging basket, described
Counterweight is placed in hanging basket, the quality of the dynamometer measurement counterweight, the hanging basket moves straight down, and pulls and pass by hawser
Thrust is passed to soil sample and simulation stake simulation Thrust of Landslide in turn by power axis Level Promoting ejector dozer, the ejector dozer.
2. the passive pile soil arching effect experimental rig according to claim 1 based on seepage effect, which is characterized in that described
Transparent cover plate is covered with above cover, the top of the transparent cover plate is equipped with photographing device, the photographing device shooting soil sample
Surface variation, the force transmission shaft connect displacement meter, and the displacement meter monitors the displacement of soil sample, is embedded with pressure cell in the soil sample
And osmometer, the internal stress field of the pressure cell monitoring soil sample, the inside seepage field of the osmometer monitoring soil sample.
3. the passive pile soil arching effect experimental rig according to claim 2 based on seepage effect, which is characterized in that described
The side of cover, which is equipped with, seals cable hole and switchable gas vent, and the data line of the pressure cell and osmometer is walked by sealing
String holes is pierced by, and the residual gas in chamber is discharged by opening the gas vent.
4. the passive pile soil arching effect experimental rig according to claim 1 based on seepage effect, which is characterized in that described
It is provided with water hole on ejector dozer and breast boards, and is covered with gauze, the centre of the cover is equipped with sealing rubber circle, the power transmission
The outside of axis is equipped with sealing ring.
5. the passive pile soil arching effect experimental rig according to claim 1 based on seepage effect, which is characterized in that described
Water outlet includes that the first lateral road, the first perpendicular road, the second lateral road and the second perpendicular road, first lateral road are located at the lower section of chamber,
The upper end flush of second lateral road and chamber, first lateral road, the first perpendicular road, the second lateral road and the second perpendicular road are successively
Bucket is placed in connection, the lower section in the second perpendicular road, and the inlet channel is equipped with valve, the first perpendicular road and the second perpendicular road
Lower section is equipped with valve.
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