CN104865371A - Experiment device and method for consolidation of soft foundation under vacuum condition - Google Patents

Experiment device and method for consolidation of soft foundation under vacuum condition Download PDF

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Publication number
CN104865371A
CN104865371A CN201510267113.2A CN201510267113A CN104865371A CN 104865371 A CN104865371 A CN 104865371A CN 201510267113 A CN201510267113 A CN 201510267113A CN 104865371 A CN104865371 A CN 104865371A
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soil
experiment
water
pressure gauge
container cavity
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CN104865371B (en
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雷鸣
黄立浦
谌志伟
王健
李仁杰
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Changsha University
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Changsha University
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Abstract

The invention relates to the technical field of soft foundation treatment, in particular to an experiment device and method for consolidation of a soft foundation under a vacuum condition. The experiment device comprises a tank body, a vacuum water discharge system and a test system, wherein two partition boards are arranged in the tank body and divide the tank body into two water containing cavities and an accommodating cavity for accommodating an experiment soil body, the two water containing cavities are located on two opposite sides of the accommodating cavity respectively, multiple water seepage holes are formed in the partition boards, and the water containing cavities are communicated with the accommodating cavity through the water seepage holes, so that hydrogeological conditions in an actual project can be simulated accurately and effectively; the vacuum water discharge system is used for discharging water in the experiment soil body and solidifying the experiment soil body; the test system is used for collecting various data in experiments used for research, providing scientific data for theoretical research and promoting intensive research on a soft foundation consolidation treatment mode under the vacuum condition.

Description

Reinforcing soft foundation experimental provision and experimental technique under a kind of vacuum action
Technical field
The present invention relates to a kind of soft foundation processing technology field, especially relate to reinforcing soft foundation experimental provision and experimental technique under a kind of vacuum action.
Background technology
China is riverine, along the river, along the lake and coastland is extensively distributed with soft soil foundation, along with national economy rapidly increases and the extension in city, Industrial and Civil Engineering, traffic engineering all inevitably and these soft soil foundations there is more and more closer common factor.For ensureing engineering construction quality and battalion's safety, reinforcing soft foundation is indispensable, and vacuum method is a kind of effective soft base processing method, application achieves comparatively ten-strike at home and abroad, but soft soil consolidation mechanism also exists dispute under vacuum action, seriously govern the popularization of concretion of soft foundation processing mode under vacuum action.
In order to study concretion of soft foundation mechanism under vacuum action, the theoretical research of system is carried out to soft base processing method and experimental study becomes requisite research means, a lot of scholar proposes soft soil consolidation mechanism under many vacuum action now, but existing experimental provision is in shop experiment, accurately can not effectively simulate hydrogeological condition in Practical Project, the emphasis of most experiment is made to be Changing Pattern and the final effect of a certain or several the parameters of weak soil under vacuum action, be not enough to the theoretical research supporting concretion of soft foundation mechanism under vacuum action, therefore numerous theoretical research result all can not obtain scientific validation because not having scientific and effective experimental provision, the research of impact to concretion of soft foundation under vacuum action.
Summary of the invention
(1) technical matters that will solve
The object of this invention is to provide one can hydrogeological condition in accurate analog Practical Project, and reinforcing soft foundation experimental provision under the simple vacuum action of structure, obtain the every accurate parameter of testing the soil body in experiment, to solve the experimental provision of concretion of soft foundation mechanism under existing vacuum action, be not enough to support the theoretical research problem of concretion of soft foundation mechanism under vacuum action.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides reinforcing soft foundation experimental provision under a kind of vacuum action, comprising:
Casing, two dividing plates are provided with in described casing, the container cavity that two water chambers and one are used for holding the experiment soil body separated by casing by described two dividing plates, described two water chambers lay respectively at the relative both sides of described container cavity, wherein, described dividing plate is provided with multiple water seepage hole, and described water chamber is communicated with by water seepage hole with described container cavity;
Low-pressure drainage system, comprise vertical drainage part, horizontal drainage part, diaphragm seal, aqueous vapor separating bottle and vacuum pump, layer of sand is equipped with above the described experiment soil body in container cavity, described diaphragm seal is layed on described layer of sand, for by layer of sand, the experiment soil body and air separate, described vertical drainage part is vertically inserted in the described experiment soil body, described horizontal drainage part is arranged at and is laid in described layer of sand, and described horizontal drainage part is connected with described vacuum pump by connecting pipe, described aqueous vapor separating bottle is arranged on described connecting pipe, wherein, described vertical drainage part and horizontal drainage part are respectively equipped with multiple treatment hole,
Test macro, comprise the first pore pressure gauge, second pore pressure gauge, 3rd pore pressure gauge, first vacuum meter, second vacuum meter, 3rd vacuum meter and data collecting instrument, described first vacuum meter is inserted in described layer of sand, described second vacuum meter is inserted in the described experiment soil body, described 3rd vacuum meter is arranged on described aqueous vapor separating bottle, described first pore pressure gauge, second pore pressure gauge and the 3rd pore pressure gauge lay respectively at the bottom of the described experiment soil body, middle part and top, and described first pore pressure gauge, second pore pressure gauge, 3rd pore pressure gauge is connected with described data collecting instrument.
Preferably, the textured fibre for embodying experiment soil body horizontal direction each point sedimentation and deformation situation is also embedded with along its horizontal direction in the described experiment soil body.
Preferably, three layers of textured fibre are embedded with altogether along its vertical direction in the described experiment soil body.
Preferably, described dividing plate, vertical drainage part and horizontal drainage part are all coated with geotextile outward.
Preferably, the inwall of described container cavity and water chamber is provided with scale.
Preferably, described vertical drainage part is nine drainpipes being evenly distributed in the described experiment soil body, and described horizontal drainage part is " day " font drainpipe that level is layed in described layer of sand.
Preferably, the connecting pipe between described aqueous vapor separating bottle and vacuum pump is provided with operation valve.
Preferably, a sidewall of described container cavity dismountable be connected to container cavity base plate and two dividing plates on.
Preferably, described in described water chamber inner close fitting, dividing plate is also provided with the baffle plate that can slide up and down, for controlling the connected state of container cavity and water chamber.
Present invention also offers reinforcing soft foundation experimental technique under a kind of vacuum action, comprise the following steps:
S1, experimentally model and Practical Project prototype meet soft subgrade soil body size and underground water table height in the principle of similarity theory and Practical Project, determine height of water level in experiment soil body size and water chamber;
S2, geotextile is covered by the dividing plate between container cavity and water chamber, and the vertical drainage part of coated geotextile is inserted in container cavity, then the experiment soil body gathered in Practical Project is loaded in container cavity, successively in the bottom of the experiment soil body in filling process, the first pore pressure gauge is installed at middle part and top, second pore pressure gauge and the 3rd pore pressure gauge, the second vacuum meter is plugged in the experiment soil body, and by the first pore pressure gauge, second pore pressure gauge, 3rd pore pressure gauge is connected with data collecting instrument, then on the experiment soil body, layer of sand is re-layed, and the horizontal drainage part being coated with geotextile is embedded in layer of sand, first vacuum meter is inserted in layer of sand,
S3, on layer of sand, dig seal groove along container cavity inwall, diaphragm seal is covered layer of sand, the surrounding of diaphragm seal is embedded in seal groove, fill up seal groove with clay and tamp, then horizontal drainage part is connected with aqueous vapor separating bottle and vacuum pump by connecting pipe, and on aqueous vapor separating bottle, the 3rd vacuum meter is installed;
S4, by the water chamber of both sides inject water, reach the height of water level determined in S1;
S5, unlatching vacuum pump, read vacuum meter data, pore water pressure force data, waterlevel data, a soil body surface deformation data in the experiment starting stage every five minutes, make a record; The termination of pumping when aqueous vapor separating bottle pressure reaches more than 90kPa the operation valve of closing between aqueous vapor separating bottle and vacuum pump, when aqueous vapor separating bottle pressure is lower than turn on pump pressurization again during 80kPa, experiment mid-term stage and later stage, read the time interval of data depending on testing sedimentation and deformation and the hole pressure change of the soil body;
S6, off-test when the subsidence rate of testing the soil body is less than 1mm/h, disposal data also carries out data analysis.
(3) beneficial effect
Technique scheme tool of the present invention has the following advantages: under vacuum action provided by the invention, treatment of soft foundation experimental provision comprises casing, low-pressure drainage system and test macro, two dividing plates are provided with in described casing, the container cavity that two water chambers and one are used for holding the experiment soil body separated by casing by described two dividing plates, described two water chambers lay respectively at the relative both sides of described container cavity, wherein, described dividing plate is provided with multiple water seepage hole, described water chamber is communicated with by water seepage hole with described container cavity, for accurately effectively simulating hydrogeological condition in Practical Project, low-pressure drainage system is discharged the moisture in the experiment soil body and is made experiment soil solidifying, test macro collects the various data in the experiment for studying, for theoretical research provides science data, promote concretion of soft foundation processing mode further investigation under vacuum action.
Accompanying drawing explanation
Fig. 1 is inner structure schematic diagram when reinforcing soft foundation experimental provision uses under embodiment of the present invention vacuum action;
Fig. 2 is the body structure schematic diagram of reinforcing soft foundation experimental provision under embodiment of the present invention vacuum action;
Fig. 3 is the horizontal drainage part schematic diagram of reinforcing soft foundation experimental provision under embodiment of the present invention vacuum action.
In figure: 1: casing; 11: container cavity; 12: water chamber; 2: low-pressure drainage system; 21: vertical drainage part; 22: horizontal drainage part; 23: aqueous vapor separating bottle; 24: connecting pipe; 25: vacuum pump; 26: diaphragm seal; 3: test macro; 31: data collecting instrument; 32: the first vacuum meters; 33: the second vacuum meters; 34: the three vacuum meters; 35: the first pore pressure gauges; 36: the second pore pressure gauges; 37: the three pore pressure gauges; 4: the experiment soil body; 5: layer of sand; 6: clay; 7: textured fibre; 8: water.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 1, reinforcing soft foundation experimental provision under the vacuum action that the embodiment of the present invention provides, comprise casing 1, low-pressure drainage system 2 and test macro 3, two dividing plates 13 are provided with in this casing 1, the container cavity 11 that two water chambers 12 and one are used for holding the experiment soil body 4 separated by casing 1 by two dividing plates 13, two water chambers 12 lay respectively at the relative both sides of container cavity 11, wherein, dividing plate 13 is provided with multiple water seepage hole (not shown), water chamber 12 is communicated with by water seepage hole with container cavity 11, test in the soil body 4 for the water 8 in water chamber 12 being penetrated in container cavity 11.
Low-pressure drainage system 2 comprises vertical drainage part 21, horizontal drainage part 22, diaphragm seal 26, aqueous vapor separating bottle 23 and vacuum pump 25, the layer of sand 5 for draining is equipped with above the described experiment soil body 4 in container cavity 11, diaphragm seal 26 is layed on layer of sand 5, for by layer of sand 5, the experiment soil body 4 separates with air, wherein, vertical drainage part 21 is vertically inserted in the experiment soil body 4 be seated in container cavity 11, horizontal drainage part 22 is embedded in layer of sand 5, wherein, vertical drainage part 21 and horizontal drainage part 22 are respectively equipped with multiple treatment hole (not shown), for will experiment the soil body 4 in water filtration in vertical drainage part 21 and horizontal drainage part 22, horizontal drainage part 22 is connected with vacuum pump 25 by connecting pipe 24, vacuum pump 25 provides power for leaching the moisture of testing in the soil body 4, aqueous vapor separating bottle 23 to be arranged between vacuum pump 25 and horizontal drainage part 22 on connecting pipe 24, aqueous vapor for leaching is separated, wherein, selecting and arranging according to drainage element in Practical Project, as shown in Figures 2 and 3, in experiment, vertical drainage part 21 can be nine vertical drainpipe compositions, nine drainpipes are uniformly distributed in the experiment soil body, make the scope of water in the collection experiment soil body larger, same horizontal drainage part 22 is " day " font drainpipe, is provided with and the mouth of pipe for being connected with vacuum pump 25 in the middle part of horizontal drain pipe 22.Vertical drainage part 21 and horizontal drainage part 22 also can select drain bar, in the experiment soil body 4, plug four pieces of drain bars, and tile one piece of drain bar in layer of sand 5, thus can be wider contact with layer of sand 5 with the experiment soil body 4, leach moisture faster.
Test macro comprises the first pore pressure gauge 35, second pore pressure gauge 36, 3rd pore pressure gauge 37, first vacuum meter 32, second vacuum meter 33, 3rd vacuum meter 34 and data collecting instrument 31, wherein, first vacuum meter 32 is inserted in layer of sand 5, for measuring diaphragm seal 26 times vacuum tightnesss, second vacuum meter 33 is inserted in the experiment soil body 4, for testing certain depth place vacuum tightness in soil, 3rd vacuum meter 34 is arranged on aqueous vapor separating bottle 23, for monitoring the vacuum tightness in connecting pipe 24, be convenient to the situation according to air pressure herein, control the duty of vacuum pump 25, reduce unnecessary waste, first pore pressure gauge 35, second pore pressure gauge 36 and the 3rd pore pressure gauge 37 lay respectively at the bottom of the experiment soil body 4, middle part and top, for the pore water pressure force value of different depth in the test experiments soil body 4, first pore pressure gauge 35, second pore pressure gauge 36, 3rd pore pressure gauge 37 is connected with data collecting instrument 31, the data gathered show in real time and store on data collecting instrument 31.
In an experiment, in the horizontal direction of the experiment soil body 4, the sedimentation and deformation degree of each point has difference, in order to grasp the sedimentation and deformation situation of each point in horizontal direction, preferably, as shown in Figure 1, textured fibre 7 is buried underground in the experiment soil body 4, the sedimentation and deformation degree of the experimentally soil body 4 each point understood by textured fibre 7, embody the final deformation state of each point, after experiment terminates, the direct deformation condition observed according to textured fibre 7 just can obtain the sedimentation and deformation data testing the soil body 4 each point, and record data for experimental analysis, preferably, textured fibre 7 is netted textured fibre layers of multiple textured fibre bar composition, be paved with the whole xsect in the experiment soil body 4 completely, textured fibre bar diameter is less, do not affect the filtration of moisture.
In order to obtain the cross-sectional deformation situation of testing different depth on the soil body 4 vertical direction, preferably, as shown in Figure 1, three layers of textured fibre 7 are laid in the experiment soil body 4, because the experiment soil body 4 deformation of bottom is less, so preferably select three layers of textured fibre 7 to be all laid on position above in the middle part of the experiment soil body 4.
In order to prevent from testing treatment hole on the soil body or sand blocking vertical drainage part 21 and horizontal drainage part 22 and container cavity 11 and the water seepage hole on the space bar 13 of water chamber 12, preferably, in vertical drainage part 21 and horizontal drainage part 22 outer cladding geotextile, the experiment soil body in addition to water or sand is stoped to enter.
In order to the every data in the experiment of simple record accurately, the timely progress grasping experiment, preferably, the inwall of container cavity 11 and water chamber 12 is provided with scale, load the experiment soil body 4 and fill out pour water 8 time, observing scale simultaneously, stopping when reaching the height needed for calculating at the experiment soil body 4 and water 8, and record the slippage of once testing the soil body 4 and water 8 in an experiment at set intervals, for grasping progress and the experimental data of experiment.
In the present embodiment, in order in an experiment or terminate after, open the container cavity cutting experiment soil body 4, the observation experiment soil body 4 internal modification situation, preferably, on the base plate that a sidewall of container cavity 11 is dismountable is connected to container cavity 11 and two dividing plates 13, specifically can by anatomical connectivity such as existing screw, chutes.
According to hydrologic conditions different in Practical Project, in order to control the water supply situation of the experiment soil body in water chamber 12 pairs of container cavities 11, as depicted in figs. 1 and 2, at the dividing plate 13 be close between container cavity 11 and water chamber 12, the baffle plate 14 that can slide up and down is set, and this baffle plate 14 is positioned at water chamber 12, its concrete structure is, the sidewall of water chamber 12 being close to dividing plate 13 is arranging the chute matched with baffle plate 14, when needs forbid that water chamber 12 pairs of container cavities 11 supply water, in order to ensure the sealing of container cavity, baffle plate 14 is slided into bottom water chamber 12 along chute, block the water seepage hole on dividing plate 13 completely, anti-sealing 8 enters in container cavity 11 from water seepage hole, play sealing function simultaneously.
The present embodiment is also for above-mentioned experimental provision, and provide treatment of soft foundation experimental technique under a kind of vacuum action, it specifically comprises the steps:
S1, experimentally model and Practical Project prototype meet soft subgrade soil body size and underground water table height in the principle of similarity theory and Practical Project, determine height of water level in experiment soil body size and water chamber;
S2, geotextile is covered by the dividing plate 13 between container cavity 11 and water chamber 12, and the vertical drainage part 21 of coated geotextile is inserted in container cavity 11, then the experiment soil body 4 gathered in Practical Project is loaded in container cavity 11, successively in the bottom of the experiment soil body 4 in filling process, the first pore pressure gauge 35 is installed at middle part and top, second pore pressure gauge 36 and the 3rd pore pressure gauge 37, the second vacuum meter 33 is plugged in the experiment soil body 4, and by the first pore pressure gauge 35, second pore pressure gauge 36, 3rd pore pressure gauge 37 is connected with data collecting instrument 31, then on the experiment soil body 4, layer of sand 5 is re-layed, and the horizontal drainage part 22 being coated with geotextile is embedded in layer of sand 5, first vacuum meter 32 is inserted in layer of sand 5,
S3, on layer of sand 5, dig seal groove along the inwall of container cavity 11, diaphragm seal 26 is covered layer of sand 5, the surrounding of diaphragm seal 26 is embedded in seal groove, fill up seal groove with clay 6 and tamp, then horizontal drainage part 22 is connected with aqueous vapor separating bottle 23 and vacuum pump 25 by connecting pipe 24, and on aqueous vapor separating bottle 23, the 3rd vacuum meter 34 is installed;
S4, the water chamber 12 of both sides is injected water 8, reach the height of water level determined in S1;
S5, unlatching vacuum pump 25, read vacuum meter data, pore water pressure force data, waterlevel data, a soil body surface deformation data in the experiment starting stage every five minutes, make a record; The termination of pumping when aqueous vapor separating bottle 23 pressure reaches more than 90kPa the operation valve of closing between aqueous vapor separating bottle 23 and vacuum pump 25, when the pressure of aqueous vapor separating bottle 23 is lower than turn on pump pressurization again during 80kPa, experiment mid-term stage and later stage, read the time interval of data depending on testing sedimentation and deformation and the hole pressure change of the soil body 4;
S6, off-test when the subsidence rate of testing the soil body 4 is less than 1mm/h, disposal data also carries out data analysis.
According to similarity theory principle, height of water level in the water chamber 12 of testing the concrete size of the soil body 4 in being determined to test by the soft subgrade soil body size in construction Practical Project and underground water table height, so that hydrologic condition in energy accurate analog Practical Project, obtain accurate, effective experimental data.
For roadbed in the present embodiment, according to similarity theory principle, the size conforms ratio H/0.6 of the size in Practical Project and empirical model, as under roadbed actual in Practical Project, weak soil thickness is about 17m, according to ratio, the degree of depth of the corresponding experiment soil body 4 gets 0.6m, soil body end face size is tested equally according in underground water table distance weak soil end face physical size in Practical Project and aforementioned ratio determination water chamber 12 middle water level distance container cavity 11, namely the height of water level in water chamber 12 is determined, in order to improve experiment and the similarity in Practical Project, the experiment soil body 4 is the original soil gathered in Practical Project.
Dividing plate 13 between container cavity 11 and water chamber 12 covers geotextile, and geotextile is arranged in container cavity 12, then using the original soil that gathers in Practical Project as the experiment soil body 4, be loaded in container cavity 11, as shown in Figure 1, the vertical drainage part 21 of coated geotextile is inserted in container cavity 11, and successively in the bottom of the experiment soil body 4 in filling process, the first pore pressure gauge 35 is installed at middle part and top, second pore pressure gauge 36 and the 3rd pore pressure gauge 37, the second vacuum meter 33 is plugged in the experiment soil body 4, and by the first pore pressure gauge 35, second pore pressure gauge 36, 3rd pore pressure gauge 37 is connected with data collecting instrument 31, when testing the soil body 4 and being filled to distance vertical drainage part 21 top about 2cm, the experiment soil body 4 re-lays layer of sand 5, when layer of sand 5 exceeds vertical drainage part 21 top about 1cm, lay the horizontal drainage part 22 being coated with geotextile, continue to lay layer of sand 5 paramount go out horizontal drainage part 22 general 2cm time layer of sand 5 lay complete, the first vacuum meter 32 is plugged in layer of sand 5, for measuring the vacuum tightness of more than water level.
In order to increase the sealing in container cavity 11, preferably, as shown in Figure 1, layer of sand 5 digs seal groove along the inwall of container cavity 11, sealing groove depth is in the experiment soil body 4, diaphragm seal 26 is covered layer of sand 5, the surrounding of diaphragm seal 26 is embedded in seal groove, fill up seal groove with clay 6 and tamp, then horizontal drainage part 22 is connected with aqueous vapor separating bottle 23 and vacuum pump 25 by connecting pipe 24, and on aqueous vapor separating bottle 23, the 3rd vacuum meter 34 is installed, note the membrane process of the connecting line of survey pore pressure gauge, vacuum meter and connecting pipe 24.
As shown in Figure 1, inject water 8 at the water chamber 12 of container cavity 11 both sides, make water level reach the theoretical height of water level calculated according to underground water table altitude gauge in similarity theory and Practical Project.
Before experiment, preliminary work is complete, and experiment starts, and opens vacuum pump 25, reads vacuum meter data, pore water pressure force data, waterlevel data, a soil body surface deformation data, make a record in the experiment starting stage every five minutes, the termination of pumping when aqueous vapor separating bottle 23 pressure reaches more than 90kPa the operation valve of closing between aqueous vapor separating bottle 23 and vacuum pump 25, because when general condition downforce reaches an atmospheric pressure substantially, substantially can not increase again, if continue turn on pump can cause unnecessary waste, when the pressure of aqueous vapor separating bottle 23 is lower than turn on pump pressurization again during 80kPa, experiment mid-term stage and later stage, read the time interval of data depending on testing sedimentation and deformation and the hole pressure change of the soil body 4, off-test when the subsidence rate of testing the soil body is less than 1mm/h, disposal data also carries out data analysis, vacuum degree under the concrete diaphragm seal 26 gathering (i.e. reinforcing soft foundation process) each time point in experiment and soil body top layer, in the middle part of the soil body, the negative pore water pressure value in soil body deep, gather soil body surface each point Vertical Settlement value, the soil body periphery horizontal shift value of each time point in reinforcing soft foundation process, and after experiment terminates, measure the soil body each depth sedimentation end value and distribution, measure the drop-out value of water level at each time point of water chamber 12, thus acquire each parameter in time along the curve of the degree of depth, analyze parameters in time, along the Changing Pattern of the degree of depth, thus determine the supplementary rule of the periphery water source in the distortion of corresponding weak soil, stressed rule and vacuum to the soil body, concretion of soft foundation mechanism under grasp vacuum action.
It should be noted that, the present embodiment is the explanation carried out for roadbed treatment, if foundations, according to hydrologic condition in the Practical Project of the principle of the invention and structure and foundations, can arrange water chamber in the surrounding of container cavity.
In sum, under vacuum action provided by the invention, treatment of soft foundation experimental provision comprises casing, low-pressure drainage system and test macro, two dividing plates are provided with in casing, the container cavity that two water chambers and one are used for holding the experiment soil body separated by casing by described two dividing plates, described two water chambers lay respectively at the relative both sides of described container cavity, wherein, described dividing plate is provided with multiple water seepage hole, described water chamber is communicated with by water seepage hole with described container cavity, for accurately effectively simulating hydrogeological condition in Practical Project, low-pressure drainage system is got rid of the moisture in the experiment soil body and is made experiment soil solidifying, test macro collects the various data in the experiment for studying, for theoretical research provides science data, promote concretion of soft foundation processing mode further investigation under vacuum action, experimentally can also infer the final average settlement of Practical Project weak soil by the final average settlement of middle experiment soil body surface, thus design and construction, the final experiment soil body obtained after experiment can also be utilized to terminate, record in advance Practical Project reinforced after the parameters of weak soil, as every physical property index (density, specific gravity of soil partical, water cut, void ratio etc.), the soil classifiction of soil, and then for judging that the foundation capability after reinforcing makes deduction.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. a reinforcing soft foundation experimental provision under vacuum action, is characterized in that: comprising:
Casing, two dividing plates are provided with in described casing, the container cavity that two water chambers and one are used for holding the experiment soil body separated by casing by described two dividing plates, described two water chambers lay respectively at the relative both sides of described container cavity, wherein, described dividing plate is provided with multiple water seepage hole, and described water chamber is communicated with by water seepage hole with described container cavity;
Low-pressure drainage system, comprise vertical drainage part, horizontal drainage part, diaphragm seal, aqueous vapor separating bottle and vacuum pump, layer of sand is equipped with above the described experiment soil body in container cavity, described diaphragm seal is layed on described layer of sand, for by layer of sand, the experiment soil body and air separate, described vertical drainage part is vertically inserted in the described experiment soil body, described horizontal drainage part is arranged at and is laid in described layer of sand, and described horizontal drainage part is connected with described vacuum pump by connecting pipe, described aqueous vapor separating bottle is arranged on described connecting pipe, wherein, described vertical drainage part and horizontal drainage part are respectively equipped with multiple treatment hole,
Test macro, comprise the first pore pressure gauge, second pore pressure gauge, 3rd pore pressure gauge, first vacuum meter, second vacuum meter, 3rd vacuum meter and data collecting instrument, described first vacuum meter is inserted in described layer of sand, described second vacuum meter is inserted in the described experiment soil body, described 3rd vacuum meter is arranged on described aqueous vapor separating bottle, described first pore pressure gauge, second pore pressure gauge and the 3rd pore pressure gauge lay respectively at the bottom of the described experiment soil body, middle part and top, and described first pore pressure gauge, second pore pressure gauge, 3rd pore pressure gauge is connected with described data collecting instrument.
2. reinforcing soft foundation experimental provision under vacuum action according to claim 1, is characterized in that: be also embedded with the textured fibre for embodying experiment soil body horizontal direction each point sedimentation and deformation situation along its horizontal direction in the described experiment soil body.
3. reinforcing soft foundation experimental provision under vacuum action according to claim 2, is characterized in that: be embedded with three layers of textured fibre altogether along its vertical direction in the described experiment soil body.
4. reinforcing soft foundation experimental provision under vacuum action according to claim 3, is characterized in that: described dividing plate, vertical drainage part and horizontal drainage part are all coated with geotextile outward.
5. reinforcing soft foundation experimental provision under vacuum action according to claim 4, is characterized in that: the inwall of described container cavity and water chamber is provided with scale.
6. reinforcing soft foundation experimental provision under vacuum action according to claim 5, it is characterized in that: described vertical drainage part is nine drainpipes being evenly distributed in the described experiment soil body, described horizontal drainage part is " day " font drainpipe that level is layed in described layer of sand.
7. reinforcing soft foundation experimental provision under vacuum action according to claim 6, is characterized in that: the connecting pipe between described aqueous vapor separating bottle and vacuum pump is provided with operation valve.
8. reinforcing soft foundation experimental provision under vacuum action according to claim 7, is characterized in that: on the base plate that a sidewall of described container cavity is dismountable is connected to container cavity and two dividing plates.
9. reinforcing soft foundation experimental provision under vacuum action according to claim 8, is characterized in that: described in described water chamber inner close fitting, dividing plate is also provided with the baffle plate that can slide up and down, for controlling the connected state of container cavity and water chamber.
10. a reinforcing soft foundation experimental technique under vacuum action, is characterized in that: comprise the following steps:
S1, experimentally model and Practical Project prototype meet soft subgrade soil body size and underground water table height in the principle of similarity theory and Practical Project, determine height of water level in experiment soil body size and water chamber;
S2, geotextile is covered by the dividing plate between container cavity and water chamber, and the vertical drainage part of coated geotextile is inserted in container cavity, then the experiment soil body gathered in Practical Project is loaded in container cavity, successively in the bottom of the experiment soil body in filling process, the first pore pressure gauge is installed at middle part and top, second pore pressure gauge and the 3rd pore pressure gauge, the second vacuum meter is plugged in the experiment soil body, and by the first pore pressure gauge, second pore pressure gauge, 3rd pore pressure gauge is connected with data collecting instrument, then on the experiment soil body, layer of sand is re-layed, and the horizontal drainage part being coated with geotextile is embedded in layer of sand, first vacuum meter is inserted in layer of sand,
S3, on layer of sand, dig seal groove along container cavity inwall, diaphragm seal is covered layer of sand, the surrounding of diaphragm seal is embedded in seal groove, fill up seal groove with clay and tamp, then horizontal drainage part is connected with aqueous vapor separating bottle and vacuum pump by connecting pipe, and on aqueous vapor separating bottle, the 3rd vacuum meter is installed;
S4, by the water chamber of both sides inject water, reach the height of water level determined in S1;
S5, unlatching vacuum pump, read vacuum meter data, pore water pressure force data, waterlevel data, a soil body surface deformation data in the experiment starting stage every five minutes, make a record; The termination of pumping when aqueous vapor separating bottle pressure reaches more than 90kPa the operation valve of closing between aqueous vapor separating bottle and vacuum pump, when aqueous vapor separating bottle pressure is lower than turn on pump pressurization again during 80kPa, experiment mid-term stage and later stage, read the time interval of data depending on testing sedimentation and deformation and the hole pressure change of the soil body;
S6, off-test when the subsidence rate of testing the soil body is less than 1mm/h, disposal data also carries out data analysis.
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Cited By (4)

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CN105862936A (en) * 2016-04-18 2016-08-17 温州交通技术学校 Soft foundation treatment test device for stimulating vacuum joint gas injection
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CN107907657A (en) * 2017-11-15 2018-04-13 温州大学 The model measurement device and its test method of earth pillar silting effect during high water stream mud PVD is consolidated under vacuum pressure
CN107976164A (en) * 2017-11-16 2018-05-01 温州大学 Measure the bath scaled model experimental device and its measuring method of displacement model in high-moisture stream silt particle well consolidation process under vacuum pressure
CN108414728A (en) * 2018-02-07 2018-08-17 南京科兴新材料科技有限公司 Weak soil displacement field and the visual experimental rig of seepage field and test method under a kind of vacuum method

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