CN205712218U - The dynamically foundation model assay device of artesian water effect - Google Patents
The dynamically foundation model assay device of artesian water effect Download PDFInfo
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- CN205712218U CN205712218U CN201620273470.XU CN201620273470U CN205712218U CN 205712218 U CN205712218 U CN 205712218U CN 201620273470 U CN201620273470 U CN 201620273470U CN 205712218 U CN205712218 U CN 205712218U
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Abstract
The utility model discloses the foundation model assay device of a kind of dynamic artesian water effect.Including model casing, pressure-bearing Stilt layer, artesian pressure regulation system, sensor fastening device and measurement system；Arranging pressure-bearing Stilt layer bottom model casing, pressure-bearing Stilt layer is connected with artesian pressure regulation system；Artesian pressure regulation system is made up of Miniature water pressure transmitter, plexiglass cylinder device and effusion meter；Plexiglass cylinder device connects with effusion meter, accurately regulates the change of water-column in plexiglass cylinder device thus the dynamic change of artesian water in implementation model case by effusion meter；This utility model can simulate the dynamic changing process of artesian water；Measure Water And Earth Pressures and the deformation of ground under dynamic artesian water effect, determine the problem such as ground stress and development of deformation rule；Seeking amplitude and the speed impact on foundation stability of the change of dynamic artesian water, the ground Study on Problems caused for dynamic artesian water effect provides effective test data support.
Description
Technical field
This utility model relates to a kind of foundation model assay device, particularly relate to the foundation model assay device under dynamic artesian water effect, interaction between bearing course and overlying weak water penetration foundation soil body when can be used for simulating dynamic artesian water effect, Water And Earth Pressures response, deformation and the stability problem of ground under research trends artesian water effect.
Background technology
In strand, riparian area not only rich groundwater, alternating layers distribution between foundation soil Chang Chengqiang, aquiclude, often facing below aquiclude at the bottom of Deep Foundation Pit in engineering and remain the situation at bearing course, foundation pit deformation that artesian water effect causes and destabilization problems are one of material risk sources of such area deep-foundation pit engineering.Central area for large-scale excavation can be reduced to foundation model, and the method can tested by designing foundation model discloses the confined water regime in this region and changes the response of aquiclude water and soil and deformation rule at the bottom of the hole caused.
Using set soil constitutive model compared to the research of economics analysis method and finite element numerical method, soil mass water soil pressure and deformation size that the change of calculated confined water regime causes choose, to calculating parameter, the dependency having the most greatly；Rare dynamic change artesian pressure and the continuous real-time synchronization Monitoring Data of foundation ditch Water And Earth Pressures during Practical Project monitoring, and in research process, it is difficult to the Water And Earth Pressures response cheating end aquiclude and the soil deformation rule that the measured data obtaining a large amount of similar engineering causes with acquisition dynamic artesian water change for statistical analysis；In view of geotechnical model test under Chang Chongli, do not affect Soil Microstructure, soil particle size and soil particle interphase interaction relation are consistent with practical situation, the interaction between artesian water and hole end aquiclude soil particle can be objectively responded, be widely used in considering the microexamination of resistance to shear of soil strain stress relation.
At present, the relevant geotechnical model test research of tradition artesian water effect, do not consider that in water, gas enters the unsaturated soil problem that the test soil body may cause；The soil test of a large amount of simulation artesian water changes often considers that the classification of artesian pressure applies or reduces, it is all discontinuous between every one-level artesian pressure, therefore can not realize artesian water continuously dynamically to change, it is impossible to inquire into confined water regime rate of change to problems such as the response of soil mass water soil pressure, deformation and stability influences.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, this utility model provides the foundation model assay device of simulation confined water regime change, solve the accurate problem of modelling of confined water regime change in test, can be used for the interaction between bearing course and overlying weak water penetration foundation soil body during research confined water regime change, measure Water And Earth Pressures and the deformation of ground in dynamic artesian water change procedure, arrangement correlation test data determine the problems such as stress and the development of deformation rule of ground under dynamic artesian water effect, seek amplitude and the speed impact on foundation stability of the change of dynamic artesian water, the ground Study on Problems caused for dynamic artesian water effect provides effective test data support, and provide foundation for theoretical analysis model afterwards.
This utility model solves its technical problem and be the technical scheme is that the foundation model assay device of a kind of dynamic artesian water effect, including model casing, pressure-bearing Stilt layer, artesian pressure regulation system, sensor fastening device and five parts of measurement system；Described model casing, by all around and five pieces, bottom lucite forms, can facilitate the deformation of the soil body in observation experiment；About described model casing, the top of two sides is respectively mounted flowing water Valve, flushes with test soil body end face bottom flowing water Valve, and in process of the test, flowing water Valve stays open so that in time draining so that the waterline of the test soil body keeps constant；The bottom side of described model casing installs the first water flowing valve for the saturated soil body, and opposite side installs the second water flowing valve for connecting artesian pressure regulation system；Described pressure-bearing Stilt layer is made up of the poly (methyl methacrylate) plate of band limbers, lucite short column and anti-filter geotextile；Fix lucite short column bottom the poly (methyl methacrylate) plate of described band limbers, be positioned in model casing, and be tightly connected with four sides of model casing；The poly (methyl methacrylate) plate surface mount anti-filter geotextile of described band limbers, prevents from testing in confined water regime change procedure the loss of the soil body；Described artesian pressure regulation system is made up of Miniature water pressure transmitter, plexiglass cylinder device and effusion meter；Described plexiglass cylinder device is made up of plexiglass cylinder, lucite base, graduation mark and T-way water valve door；Described plexiglass cylinder is fixed on lucite base, and sidewalls vertical arranges graduation mark, and bottom arranges T-way water valve door；Described Miniature water pressure transmitter passes through tee T connection mode molding box and plexiglass cylinder, and Miniature water pressure transmitter can record the dynamic situation of change of artesian water continuously；Described plexiglass cylinder connect with effusion meter by T-way water valve door, accurately regulates the change of water-column in plexiglass cylinder thus dynamically the changing of artesian water in implementation model case by effusion meter；Described sensor fastening device is made up of stainless steel stent, nylon sheet and bolt；Described sensor fastening device is bolted on the trailing flank in model casing；Described nylon sheet is fixed on stainless steel stent, the circular hole installing miniature pore water pressure sensor run through is had on stainless steel stent and nylon sheet, have the circular hole installing miniature soil pressure cell in nylon sheet, stainless steel stent and nylon sheet have metallic channel for placing miniature pore water pressure sensor and the signal transmssion line of miniature soil pressure cell；Described measurement system includes miniature pore water pressure sensor, miniature soil pressure cell, multi-Channels Data Acquisition and digital camera；Described miniature pore water pressure sensor, miniature soil pressure cell and Miniature water pressure transmitter pass through signal transmssion line connecting multi-channel data collecting instrument；Described digital camera is positioned over model casing dead ahead.
Further, the bottom test soil body in model casing is gravelly sand, and to simulate pressure-bearing gravel layer, the overlying test soil body is clay silt, uses air free water saturated.
Further, described plexiglass cylinder is built with air free water
Further, described digital camera answers exclusive PCR in process of the test, and its position can not be moved；Can need to set up light source according to shooting.
Further, the position of described sensor fastening device can be adjusted according to the needs of test, and its quantity can need increase according to test；Sensor fastening device should be arranged on the model casing side not affecting digital camera shooting.
Further, the signal transmssion line of described miniature pore water pressure sensor, miniature soil pressure cell and Miniature water pressure transmitter is connected to same signal sampler, ensures the synchronous acquisition of all signals in experimental project.
Compared with prior art, the beneficial effects of the utility model are:
1, this utility model uses the method that pressure-bearing Stilt layer provides pressure-bearing gravel layer artesian pressure, close with the mode of occurence of natural artesian water；Pressure-bearing gravel layer water penetration weak with overlying soil layer directly contacts interaction between bearing course and overlying weak water penetration soil layer in objective simulation confined water regime change procedure, is conducive to disclosing the response of foundation soil body Water And Earth Pressures and the foundation soil body deformation rule that dynamic artesian water effect causes further；Often research experiment under gravity condition, does not affect the microstructure of foundation soil body so that soil particle size and soil particle interphase interaction relation are consistent with practical situation, are conducive to carrying out the microexamination relating to soil particle interphase interaction.
2, this utility model uses the air free water saturation testing soil body before the test, process of the test provides depletion of QI artesian water environment, the hole testing the soil body is made to be full of air free water, operate as above 2 benefits: one is to avoid underwater bubble to enter weak water penetration soil layer to cause the unsaturation problem (compared with saturated soil, the mechanical characteristic of unsaturated soil exists larger difference and uncertainty) of the soil body；Two is to avoid underwater bubble to disturb miniature pore water pressure sensor to affect its certainty of measurement.
3, this utility model uses effusion meter accurately to regulate change amplitude and the rate of change of water-column in plexiglass cylinder device, thus the simulation that in implementation model case, artesian water the most dynamically changes；The signal transmssion line of Miniature water pressure transmitter can record the dynamic situation of change of artesian water continuously with (be connected and have the same of miniature pore water pressure sensor and miniature soil pressure cell) multi-Channels Data Acquisition after connecting, it is achieved dynamically change artesian pressure and the synchronous monitoring of ground Water And Earth Pressures.
4, this utility model utilizes sensor fastening device to fix miniature pore water pressure sensor, miniature soil pressure cell, is prevented effectively from soil deformation in process of the test and causes sensor measurement change in location to affect measuring accuracy.
Accompanying drawing explanation
Fig. 1 is the foundation model assay device side view of dynamic artesian water effect.
Fig. 2 is the model casing top view before banketing.
Fig. 3 is pressure-bearing Stilt layer structural representation.
Fig. 4 is sensor fastening device side view.
Fig. 5 is sensor fastening device top view.
Fig. 6 is sensor fastening device profile.
In figure: model casing 1；Pressure-bearing Stilt layer 2；Poly (methyl methacrylate) plate 2-1 with limbers；Lucite short column 2-2；Anti-filter geotextile 2-3；Flowing water Valve 3；First water flowing valve 4-1；Second water flowing valve 4-2；Miniature water pressure transmitter 5；Plexiglass cylinder device 6；Plexiglass cylinder 6-1；Lucite base 6-2；Graduation mark 6-3；T-way water valve door 6-4；Effusion meter 7；Sensor fastening device 8；Stainless steel stent 8-1；Nylon sheet 8-2；Miniature pore water pressure sensor installs circular hole 8-3；Miniature soil pressure cell installs circular hole 8-4；Metallic channel 8-5；Bolt 8-6；Gravelly sand 9-1；Weak water penetration soil body 9-2；Air free water 10.
Detailed description of the invention
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1 and Figure 2, the foundation model assay device of this utility model dynamic artesian water effect, including model casing 1, pressure-bearing Stilt layer 2, artesian pressure regulation system, sensor fastening device 8 and five parts of measurement system.
Described model casing 1, by all around and five pieces, bottom lucite forms, can facilitate the deformation of the soil body in observation experiment；The top of described about 1 two side of model casing is respectively mounted flowing water Valve 3, flushes with test soil body end face bottom flowing water Valve 3, and in process of the test, flowing water Valve 3 stays open so that in time draining so that the waterline of the test soil body keeps constant；The bottom side of described model casing 1 installs the first water flowing valve 4-1 for the saturated soil body, and bottom opposite side installs the second water flowing valve 4-2 for connecting artesian pressure regulation system；Described pressure-bearing Stilt layer 2 is made up of the poly (methyl methacrylate) plate 2-1 of band limbers, lucite short column 2-2 and anti-filter geotextile 2-3；Fix lucite short column 2-2 bottom the poly (methyl methacrylate) plate 2-1 of described band limbers, be positioned in model casing 1, and be tightly connected by glass cement with four sides of model casing 1；The poly (methyl methacrylate) plate 2-1 surface mount anti-filter geotextile 2-3 of described band limbers, prevents from testing in confined water regime change procedure the loss of the soil body；Described artesian pressure regulation system is made up of Miniature water pressure transmitter 5, plexiglass cylinder device 6 and effusion meter 7；Described plexiglass cylinder device 6 is made up of plexiglass cylinder 6-1, lucite base 6-2, graduation mark 6-3 and T-way water valve door 6-4；Described plexiglass cylinder 6-1 is fixed on lucite base 6-2, and sidewalls vertical arranges graduation mark 6-3, and bottom arranges T-way water valve door 6-4；Described Miniature water pressure transmitter 5 is by tee T connection mode molding box 1 and plexiglass cylinder 6-1, and Miniature water pressure transmitter 5 can record the dynamic situation of change of artesian water continuously；Described plexiglass cylinder 6-1 is connected with effusion meter 7 by T-way water valve door 6-4, accurately regulate the change of water-column in plexiglass cylinder 6-1 thus dynamically the changing of artesian water in implementation model case 1 by effusion meter 7；Described sensor fastening device 8 is made up of stainless steel stent 8-1, nylon sheet 8-2 and bolt 8-6；Described sensor fastening device 8 is fixed on the trailing flank in model casing 1 by bolt 8-6；The position of described sensor fastening device 8 can be adjusted according to the needs of test, and its quantity can need increase according to test；Described sensor fastening device 8 should be arranged on model casing 1 side not affecting digital camera shooting；Described measurement system includes miniature pore water pressure sensor, miniature soil pressure cell, multi-Channels Data Acquisition and digital camera；Described digital camera is positioned over model casing dead ahead, can need to set up light source according to shooting；Described digital camera answers exclusive PCR in process of the test, and its position can not be moved；The signal transmssion line of described miniature pore water pressure sensor, miniature soil pressure cell and Miniature water pressure transmitter 5 is connected to same signal sampler, ensures the synchronous acquisition of all signals in experimental project.The bottom test soil body in model casing 1 is gravelly sand 9-1 (to simulate pressure-bearing soil layer), and the overlying test soil body is weak water penetration soil body 9-2 (such as clay silt etc.), uses air free water saturated.
As it is shown on figure 3, the poly (methyl methacrylate) plate 2-1 of described band limbers makes the air free water in pressure-bearing Stilt layer 2 and gravelly sand 9-1 bearing course hydraulic communication, it is provided that the artesian pressure of gravelly sand 9-1 bearing course；The arrangement of the thickness of poly (methyl methacrylate) plate 2-1 of described band limbers, the arrangement of limbers and lucite short column 2-2 should meet Force Calculation requirement so that pressure-bearing Stilt layer 2 be enough to bear the weight of the test soil body.
As shown in Fig. 4, Fig. 5, Fig. 6, described nylon sheet 8-2 is fixed on stainless steel stent 8-1, the circular hole 8-3 needed for the miniature pore water pressure sensor of installation run through is had on stainless steel stent 8-1 and nylon sheet 8-2, have the circular hole 8-4 installing miniature soil pressure cell in nylon sheet 8-2, stainless steel stent 8-1 and nylon sheet 8-2 have metallic channel 8-5 for placing miniature pore water pressure sensor and the signal transmssion line of miniature soil pressure cell.
Work process of the present utility model is as follows: first layering filling gravelly sand 9-1 compacting in model casing 1, fills to specified altitude assignment；Weak water penetration soil body 9-2 compacting is loaded in layering, and when being filled to bottom sensor fastening device 8, time-out bankets, and installs sensor fastening device 8 in the middle position of model casing 1 major axis side, tightens fixing with bolt 8-6；Miniature pore water pressure sensor and miniature soil pressure cell are then installed on sensor fastening device 8, metallic channel 8-5 draw pore water pressure sensor and the signal transmssion line of soil pressure cell, signal transmssion line is connected on multi-Channels Data Acquisition；Continue layering and load weak water penetration soil body 9-2 compacting, until having banketed, air free water saturation testing soil body gravelly sand 9-1 and weak water penetration soil body 9-2 is led to the speed of 6L/ days to model casing 1 by the first water flowing valve 4-1, treat that the soil body closes the first water flowing valve 4-1 after fully saturated, open flowing water Valve 3, in whole process of the test, flowing water Valve 3 is held open state so that in time draining so that the waterline of the test soil body keeps constant.
System (the second water flowing valve 4-2 remains turned-off) is regulated by the second water flowing valve 4-2 connection mode molding box 1 and artesian pressure, the signal transmssion line of Miniature water pressure transmitter 5 is connected to multi-Channels Data Acquisition, open T-way water valve door 6-4 and inject air free water 10 to plexiglass cylinder 6-1, flush with test soil body end face to liquid level, close T-way water valve door 6-4；Digital camera being placed in model casing 1 dead ahead, regulates camera parameter, the automatic shooting time interval arranging digital camera is 20s；If laboratory insufficient light, Led light source can be set up in digital camera both sides；Utilize miniature pore water pressure sensor, miniature soil pressure cell and the reading of Miniature water pressure transmitter 5 under data collecting instrument acquisition and recording test original state, utilize the test soil body photo under digital camera shooting test original state.
After treating that above-mentioned test preparation completes, carry out battery of tests；According to the pace of change of artesian pressure in battery of tests, calculate the flow corresponding to water-column respective change in plexiglass cylinder 6-1, set, with this, the flow value that effusion meter 7 allows, then by air free water 10 incoming stream gauge 7；Open the second water flowing valve 4-2 and T-way water valve door 6-4；Open miniature pore water pressure sensor, miniature soil pressure cell and the reading of Miniature water pressure transmitter 5 under data collecting instrument this grade of head pressure of continuous acquisition record, trigger digital camera simultaneously；Until weak water penetration soil body 9-2 occurs to dash forward gushes destruction, close the second water flowing valve 4-2 and T-way water valve door 6-4, suspend data collecting instrument and digital camera, read and record the water level value that plexiglass cylinder 6-1 high scale line 6-3 shows；The then test soil body in removal model casing 1, removal sensor fixing device 8, air free water 10 liquid level in plexiglass cylinder 6-1 is down to and tests soil body end face and flush.
Use method as defined above to repeat test, change the speed of artesian pressure change, carry out organizing test more；Respectively organize miniature pore water pressure sensor in confined water regime change procedure, miniature soil pressure cell and the reading of Miniature water pressure transmitter 5 by data collecting instrument acquisition and recording, digital camera shoot the photo testing soil deformation in each group of confined water regime change procedure.
Finally arrange often organizing result of the test, miniature pore water pressure sensor in the confined water regime change procedure of analytical data Acquisition Instrument acquisition and recording, miniature soil pressure cell and the reading of Miniature water pressure transmitter 5, draw the Water And Earth Pressures response pattern in foundation soil under dynamic artesian water effect；Carry out PIV graphical analysis by the photo captured by logarithmic code photographing unit, draw the displacement field of the soil body, thus learn the deformation rule that foundation soil body changes with confined water regime；Each group of result of the test being contrasted, ground Water And Earth Pressures is responded, deforms and the impact of stability by amplitude and the speed of analyzing the change of dynamic artesian water.
Above-described embodiment is a preferred implementation of the present utility model, is to further illustrate this utility model content and application thereof, should not be construed as this utility model and be only applicable to above-described embodiment.All technology realized based on this utility model principle and utility model content belong to scope of the present utility model.
Claims (4)
1. the foundation model assay device of a dynamic artesian water effect, it is characterized in that, including model casing (1), pressure-bearing Stilt layer (2), artesian pressure regulation system, sensor fastening device (8) and five parts of measurement system；Described model casing (1) is by all around and five pieces, bottom lucite forms；The top of two sides, described model casing (1) left and right is respectively mounted flowing water Valve (3), and flowing water Valve (3) bottom flushes with test soil body end face；The bottom side of described model casing (1) installs the first water flowing valve (4-1), and opposite side installs the second water flowing valve (4-2)；Described pressure-bearing Stilt layer (2) is made up of the poly (methyl methacrylate) plate (2-1) of band limbers, lucite short column (2-2) and anti-filter geotextile (2-3)；The fixing lucite short column (2-2) in poly (methyl methacrylate) plate (2-1) bottom of described band limbers, is positioned in model casing (1), and is tightly connected with four sides of model casing (1)；Poly (methyl methacrylate) plate (2-1) surface mount anti-filter geotextile (2-3) of described band limbers；Described artesian pressure regulation system is made up of Miniature water pressure transmitter (5), plexiglass cylinder device (6) and effusion meter (7)；Described plexiglass cylinder device (6) is made up of plexiglass cylinder (6-1), lucite base (6-2), graduation mark (6-3) and T-way water valve door (6-4)；Described plexiglass cylinder (6-1) is fixed on lucite base (6-2), and sidewalls vertical arranges graduation mark (6-3), and bottom arranges T-way water valve door (6-4)；Described Miniature water pressure transmitter (5) passes through tee T connection mode molding box (1) and plexiglass cylinder (6-1)；Described plexiglass cylinder (6-1) is connected with effusion meter (7) by T-way water valve door (6-4)；Described sensor fastening device (8) is made up of stainless steel stent (8-1), nylon sheet (8-2) and bolt (8-6)；Described sensor fastening device (8) is fixed on the trailing flank in model casing (1) by bolt (8-6)；Described nylon sheet (8-2) is fixed on stainless steel stent (8-1), the circular hole (8-3) installing miniature pore water pressure sensor run through is had on stainless steel stent (8-1) and nylon sheet (8-2), have in nylon sheet (8-2) in the circular hole (8-4) installing miniature soil pressure cell, stainless steel stent (8-1) and nylon sheet (8-2) and have metallic channel (8-5)；Described measurement system includes miniature pore water pressure sensor, miniature soil pressure cell, multi-Channels Data Acquisition and digital camera；Described miniature pore water pressure sensor, miniature soil pressure cell and Miniature water pressure transmitter (5) pass through signal transmssion line connecting multi-channel data collecting instrument；Described digital camera is positioned over model casing (1) dead ahead.
The foundation model assay device of a kind of dynamic artesian water effect the most according to claim 1, it is characterised in that the bottom test soil body in model casing (1) is gravelly sand (9-1), and the overlying test soil body is clay silt.
The foundation model assay device of a kind of dynamic artesian water effect the most according to claim 1, it is characterised in that described plexiglass cylinder (6-1) is built with air free water (10).
The foundation model assay device of a kind of dynamic artesian water effect the most according to claim 1, it is characterized in that, the signal transmssion line of described miniature pore water pressure sensor, miniature soil pressure cell and Miniature water pressure transmitter (5) is connected to same signal sampler.
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| CN201620273470.XU CN205712218U (en) | 2016-04-01 | 2016-04-01 | The dynamically foundation model assay device of artesian water effect |
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| CN201620273470.XU CN205712218U (en) | 2016-04-01 | 2016-04-01 | The dynamically foundation model assay device of artesian water effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105862933A (en) * | 2016-04-01 | 2016-08-17 | 浙江大学 | Model testing device for foundation under action of dynamic pressure bearing water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105862933A (en) * | 2016-04-01 | 2016-08-17 | 浙江大学 | Model testing device for foundation under action of dynamic pressure bearing water |
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