CN203929763U - Inside soil body Water Transport monitoring system under Loess Site immersion condition - Google Patents
Inside soil body Water Transport monitoring system under Loess Site immersion condition Download PDFInfo
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- CN203929763U CN203929763U CN201420332870.4U CN201420332870U CN203929763U CN 203929763 U CN203929763 U CN 203929763U CN 201420332870 U CN201420332870 U CN 201420332870U CN 203929763 U CN203929763 U CN 203929763U
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Abstract
The utility model discloses inside soil body Water Transport monitoring system under a kind of Loess Site immersion condition, comprise power supply, host computer, multiple soil moisture sensor, multiple pore water pressure sensor and multiple data acquisition unit; The output terminal of each sensor is the input end of connection data collector respectively, and data acquisition unit connects host computer, and power supply connects each sensor, data acquisition unit and host computer; The volumetric(al) moisture content and the pore water pressure force data that are gathered inside soil body under Loess Site immersion condition by sensor, the data that collect send to data acquisition unit, and data acquisition unit sends to host computer, by host computer, the data that receive is preserved and is shown.The utility model can gather the Water Transport data of Loess Site inside soil body under near surface immersion condition rapidly, continuously, exactly, these data can be fed back the yellow inside soil body saturation state in place, for Loess Collapsibility sensitivity assessment and prevention and control provide reliable parameter.
Description
Technical field
The utility model belongs to engineering monitoring technical field, is specifically related to a kind of inside soil body Water Transport monitoring system, particularly inside soil body Water Transport monitoring system and method under a kind of Loess Site immersion condition.The utility model change for loess body interior moisture content under earth's surface large area immersion condition and saturation region distribution rapidly, continuously, accurately monitoring.
Background technology
Loess is due to its special formation epoch and form environment, caused it to have open grain and then caused it to have strong water sensitivity, and the most outstanding form of expression of loess water sensitivity is exactly saturated yielding.Along with sustained and rapid development and the policy inclination of national economy, construction speed and the scale of China central and west regions day by day strengthen, cause loess area each big city land used day to be becoming tight, infant industry and covil construction present gradually and turn to high terrace developing state by low terrace, and prospecting, evaluation and the processing problem of the large thickness self-weight collapse loess foundation of the thing followed become the primary difficult problem that Canal in Loess Area engineering technical personnel face." Code for building construction in collapsible loess zone " obtains appraisement system for collapsibility of loess place in (GB50025-2004) is taking settling amount as guiding, emphasize net result and do not consider saturated yielding evolution, this appraisement system has instructed a large amount of construction in considerable time, achieves noticeable achievement.But we must recognize, along with construction scale of projects strengthens, the important engineering of " long, large, high, difficulty " is more and more, and a lot of engineering accidents show the saturated yielding susceptibility of loess and the final same safety that is determining engineering of saturated yielding amount.In addition, inventor is also noted that: the generation of Loess Collapsibility need reach initial moisture content, and soil body water cut reaches certain threshold value loess and starts just now saturated yielding, therefore, under local immersion condition, the process influence of moisture diffusion downwards the process of Loess Collapsibility; In addition, under part immersion condition, the scope of ground generation sedimentation is subject to the impact of moisture sideways diffusion scope, and the diffusion of moisture has determined time and the scope that Loess Collapsibility produces.Therefore, in settlement by soaking evaluation and the work of saturated yielding early warning, controlling, all need to use the data that immersion Water Under divides migration characteristics in the soil body, especially all the more so in the Important Project such as subway, high-speed railway.But, still do not obtain at present system, science, the efficient device and method of these class data, be very necessary to the research and development of this device and method, the various Important Project grounds processing in Canal in Loess Area and the work of saturated yielding early warning, controlling are of great immediate significance.
Summary of the invention
Blank and not enough for what exist in prior art, the purpose of this utility model is, the monitoring system of inside soil body Water Transport under a kind of Loess Site immersion condition is provided, this system can realize full-automatic data acquisition by sensor, power supply, collector and host computer, can be rapidly, continuously, vertical, the lateral migration speed of loess body internal moisture and soil layer saturation state under monitor earth's surface large area immersion condition, thereby provide parameter accurately and reliably for Assessment of loess collapsibility and saturated yielding scope, the early warning of saturated yielding time.
In order to achieve the above object, the utility model adopts following technical scheme to be solved:
Inside soil body Water Transport monitoring system under a kind of Loess Site immersion condition, comprises power supply, host computer, multiple pore water pressure sensor, multiple soil moisture sensor, at least one micro voltage collector, at least one current collector; Wherein, the output terminal of each pore water pressure sensor connects the input end of micro voltage collector, and the output terminal of each soil moisture sensor connects the input end of current collector, and the output terminal of micro voltage collector and current collector is connected respectively host computer; It is its power supply that power supply connects pore water pressure sensor, soil moisture sensor, micro voltage collector, current collector and host computer.
Described pore water pressure sensor is for the pore water pressure force data of inside soil body under Real-time Collection Loess Site immersion condition, described soil moisture sensor is for the soil moisture data of inside soil body under Real-time Collection Loess Site immersion condition, the data that collect send to respectively micro voltage collector and current collector, data are sent to host computer by micro voltage collector and current collector, and host computer is used for storing and showing the data that receive.
Further, described pore water pressure sensor comprises the top cover of box body, resistance strain gage, terminal block and the permeable stone material of stainless steel, for preventing that box body is corroded box bottom and has zinc coat, in box body, be fixed with the bridge circuit and the terminal block that are formed by resistance strain gage, the bridge circuit of resistance strain gage composition is close to box body inner bottom surface, and described terminal block is positioned at the top of the bridge circuit of resistance strain gage composition; The bridge circuit of resistance strain gage composition is drawn box body by terminal block by signal wire, outlet epoxy sealing, and permeable stone top cover enclosed box body is installed at box body top.
Further, described soil moisture sensor adopts FDS Series of Water sub sensor, it is made up of metal probe, frequency domain reflection functional circuit and sensor buttock line, and metal probe connects the input end of frequency domain reflection functional circuit, the output terminal connecting sensor buttock line of frequency domain reflection functional circuit.
Compared with prior art, the beneficial effects of the utility model are:
(1) the utility model adopts multiple soil moisture sensors, can realize automatic collection and storage that under immersion condition, near immersion hole, soil moisture in layer changes, picking rate is fast and full-automatic, sample rate can reach 0.5 second/time per second, and can carry out dynamically adjusting to data acquisition density and precision according to soil moisture in layer situation of change in good time.Fetch earth and measure water cut technology than artificial probing in existing process of the test, the utility model more accurately, economical and quick, and can be used for long-term observation.
(2) system architecture of the present utility model is simple, simple to operate, installation, easy to use.
Brief description of the drawings
Fig. 1 is system chart of the present utility model.
Fig. 2 is the structural representation of pore water pressure sensor.
Fig. 3 is soil moisture sensor structural representation.
Fig. 4 is U-iron bar schematic diagram.
The laying schematic diagram of Fig. 5 pore water pressure sensor and soil moisture sensor.
Number in the figure: 1, stressed film, 2, resistance strain gage, 3, terminal block, 4, signal wire, 5, permeable stone top cover, 6, box body, 7, metal probe, 8, frequency domain reflection functional circuit, 9, sensor buttock line.
Below in conjunction with drawings and Examples, the utility model is further explained to explanation.
Embodiment
As shown in Figure 1, inside soil body Water Transport monitoring system under Loess Site immersion condition of the present utility model, comprises power supply, host computer, multiple pore water pressure sensor, multiple soil moisture sensor, at least one micro voltage collector, at least one current collector; Wherein, the output terminal of each pore water pressure sensor connects the input end of micro voltage collector, and the output terminal of each soil moisture sensor connects the input end of current collector, and the output terminal of micro voltage collector and current collector is connected respectively host computer; It is its power supply that power supply connects pore water pressure sensor, soil moisture sensor, micro voltage collector, current collector and host computer.
As shown in Figure 2, pore water pressure sensor comprises the top cover 5 of box body 6, resistance strain gage 2, terminal block 3 and the permeable stone material of stainless steel, for preventing that box body 6 is corroded box bottom and has zinc coat 1, in box body 6, be fixed with the bridge circuit and the terminal block 3 that are formed by resistance strain gage 2, the bridge circuit that resistance strain gage 2 forms is close to box body 6 inner bottom surfaces, and described terminal block 3 is positioned at the top of the bridge circuit that resistance strain gage 2 forms; The bridge circuit that resistance strain gage 2 forms is drawn box body 6 by terminal block 3 by signal wire 4, outlet epoxy sealing, box body 6 tops are installed permeable stone top cover 5 and are made box body sealing, top cover 5 has larger rigidity, after sealing, all solids particle will be intercepted by permeable stone, can transmit pore water pressure isolated in causing strain by soil pressure, the measured micro voltage signal of this pore water pressure sensor causes by pore water pressure.In addition, known according to soil mechanics ultimate principle, only have after the soil body is saturated and can measure positive pore water pressure, therefore in the time that pore water pressure sensor receives signal, the soil layer that shows this pore water pressure sensor position water cut that reached capacity.
As shown in Figure 3, soil moisture sensor adopts FDS Series of Water sub sensor, it is made up of metal probe 7, frequency domain reflection functional circuit 8 and sensor buttock line 9, and metal probe connects the input end of frequency domain reflection functional circuit 8, the output terminal connecting sensor buttock line 9 of frequency domain reflection functional circuit 8.
All the sensors is embedded in behind the position shown in Fig. 5, and all the sensors buttock line is fixed on the U-iron bar by shown in Fig. 4 to bury underground on the borehole wall, and while burying well underground to prevent from being backfilling and compacted, hammer ram scratches sensor buttock line and causes damage.
Micro voltage collector is processed and is stored for gathering the output signal of pore water pressure sensor and be uploaded to host computer rapidly, continuously; Current collector is stored and shows for gathering the output signal of soil moisture sensor and be uploaded to host computer rapidly, continuously.
As shown in Figure 5, multiple soil moisture sensors are arranged on respectively apart from the bottom in Loess Site immersion district and estimate the inside soil body in extent of flooding, and the data that their gather are in order to reflect the change of moisture content situation of position soil layer of each burial place; Multiple pore water pressure sensors are arranged on respectively buries the borehole wall and foot of hole underground, and the data that they gather are in order to reflect corresponding depth of burying place soil layer saturated conditions.
Utilize monitoring system of the present utility model to the method that under Loess Site immersion condition, inside soil body Water Transport is monitored, specifically comprise the steps:
1, the assembling of monitoring system
Monitoring system, by man-made assembly, comprises the welding of soil moisture sensor, pore water pressure sensor, the assembling of power module, installation, the connection of signal wire and the matching and debugging of each sensor and corresponding data acquisition unit of host computer.
2, the demarcation of sensor
Each pore water pressure sensor is demarcated, obtained all pore water pressure sensor calibration curves; When soil moisture sensor dispatches from the factory, be demarcated as linear output, i.e. the volumetric(al) moisture content of 4～20mA correspondence 0%～100%, therefore without demarcating again.
3, sensor is buried conceptual design and enforcement underground
The first, referring to Fig. 5, in excavation immersion hole, region to be monitored.
The lower limit depth H (being self-collapsibility soil thickness) that the diameter in immersion hole will distribute with reference to local self-weight collapse loess, the diameter D in immersion hole is greater than and equals this lower limit depth H (the soil test part of H from sitework geologic prospect report obtains); In addition, the degree of depth in immersion hole is not more than 0.8m, is advisable, and need lays at the end, hole the sandy gravel that 0.1m is thick (with reference to " Code for building construction in collapsible loess zone " (GB50025-2004)) with 0.5m.
The second, in immersion hole, outside ground and immersion hole, ground excavation is multiple buries well underground and buries hole underground.Bury well underground and should follow following rule with quantity, position and the degree of depth of burying hole underground:
In order to meet monitoring requirements, to bury well quantity underground and should not be less than 4, the work funds of considering are buried well quantity underground and should not, more than 8, be advisable with 6; Because water pressure is non-directional, the burying form underground and can be strict with of pore water pressure sensor, therefore also can be aided with relatively low boring to bury pore water pressure sensor underground of cost.
According to the result of study of this area, bury well location underground and put and should arrange according to loess body immersion characteristic, (with reference to " large western Line for Passenger Transportation and the on-the-spot immersion of middle and south heavy haul railway passage collapsible loess pit retting water test research report ", " the on-the-spot immersion of the lucky new-energy automobile of Yuci District Hao family ditch plant area collapsible loess pit retting water test research report ", " research of Lanzhou large thickness self-weight collapse loess place submerging test INTEGRATED SIGHT " and relevant paper).Suppose that immersion hole radius is R, set out by the center of circle, immersion hole, 1) within the scope of R, (in immersion hole) will inevitably be saturated under water effect, so the inner soil layer in the vertical direction in immersion hole should be arranged a soil moisture sensor every 2m, bury underground and too much strengthen the difficulty of the work of burying underground because of soil moisture sensor for fear of same burying underground in well simultaneously, therefore cheating center of circle 1/3R apart from immersion, the position of 3/2R arranges respectively one and buries well underground, bury well depth underground and should equal or be slightly larger than H, so not only can monitor vertical process of osmosis but also can monitor Diffusion Law transversely.
2) R～2R scope is positioned at beyond flood zone, with reference to previous investigation, this scope is that underground moisture is very fast to must and changing through region of external diffusion, Water Transport within the scope of this is monitored the problem aspect mainly paying close attention to two, the one, disclose and infiltrate angle, the 2nd, disclose the diffusion process that infiltrates cutting edge of a knife or a sword.For this reason, should within the scope of this, excavate 3～4 and bury well underground: first (as R+1m place) and two of 2R place excavations are buried well underground near edge, immersion hole, bury the sensor of some underground as the controlled well of burying underground of this scope, bury well underground and should bury well underground one of 1.5R place increase if excavate 3, should establish two newly at R+1/3R, R+2/3R place and bury well underground if 4 of excavations are buried well underground; Or within the scope of R～2R, excavating altogether 3 buries well underground and buries underground between well and set up one for burying the hole of burying underground of pore water pressure sensor underground at the 2nd and the 3rd that counts from inside to outside; Bury underground and between well, set up a pore water pressure sensor and bury hole underground with appropriate to the occasion two of being greater than 8m at interval.
3) within the scope of 2R～2.5R, be the Far Range of moisture sideways diffusion, this region generally only has deep can be subject to water infiltration, whether shallow top layer is subject to water infiltration to depend on the infiltration angle in place, so, this scope main attention deep layer Infiltrating, should within the scope of 2.5R ± 3m, excavate 1 and bury well underground, and within the scope of 2R～2.5R, set up one for burying the hole of burying underground of pore water pressure sensor underground;
Burying the cutting depth of well (hole) underground is advisable with the lower limit depth H of self-weight collapse loess distribution.
Three, bury correspondence in well (hole) underground and bury soil moisture sensor and hole waterpower sensor underground each.It is buried form underground, buries density underground and bury quantity underground and should follow following rule:
The measuring principle of hole waterpower sensor and soil moisture sensor and geometric shape are all different, therefore it is also different to bury form underground.As shown in Figure 2, pore water pressure sensor is oblate cylindricality, cross section is rectangle, due at same position pore water pressure respectively to identical, so burying underground without considering direction of pore water pressure sensor, simultaneously, because the bridge circuit of resistance strain gage composition in pore water pressure sensor is wrapped up by sensor housing, the permeable stone top cover that water pressure sees through rigidity passes to measuring sensor, if so bury pore water pressure sensor underground in boring, only need beat at the bottom of pore water pressure sensor being placed on to hole behind predetermined depth place in boring, if need bury pore water pressure sensor in well underground burying underground, need pore water pressure sensor buttock line to be fixed on and to bury underground on the borehole wall.Soil moisture sensor structure as shown in Figure 3, because its principle of work is by the volumetric(al) moisture content of native change in resistance inverse soil, and its metal probe is long and outside exposed, so should first draw out slightly larger in diameter in the hole of sensor width on the borehole wall of pre-position while burying underground, hole depth should be slightly longer than sensor length, after pore-forming by soil moisture sensor slowly in patchhole in the soil body, be noted that in addition, because its measuring principle is easily subject to the interference of metal object, so need bury multiple sensor with metal shell or metal probe underground as buried the same depth of well underground at same sensor time, should keep distance more than 50cm with soil moisture sensor, to avoid interference the collection of soil moisture signal.
Mention above, the cutting depth that each sensor is buried well underground is preferably the lower limit depth H that self-weight collapse loess distributes, on the basis of forefathers' research conclusion, soil moisture sensor and the pore water pressure sensor that should bury at each respective depth place that buries well underground certain density and quantity underground, carry out moisture monitoring with the self-collapsibility soil layer district in whole immersion coverage.
Density buried underground by concrete sensor and quantity should be followed following principle:
Pore water pressure sensor: due to pore water pressure sensor can only measure on the occasion of pore water pressure, in the time that the soil body is saturated, just can there is positive pore water pressure and only have, so pore water pressure sensor is used for reflecting the saturated conditions of its position soil layer.Therefore, should arrange a pore water pressure sensor in each well (hole) bottom of burying underground, with comprehensive, meticulous reflection soil layer saturated conditions.
Soil moisture sensor: soil moisture sensor can be measured the water cut of the soil body from bone dry to complete saturated various states, therefore soil moisture sensor be mainly used in reflecting moisture in Loess Layer downwards with to the process of external diffusion, it buries quantity underground and density all will be much larger than pore water pressure sensor, and bury underground bury quantity underground and density is larger, more can reflect clearly the process of inside soil body Water Transport.In order to take into account economy and accuracy, soil moisture sensor bury density underground and quantity should be followed following scheme: bury well underground for 2 for immersion hole inner (being within the scope of R), each soil moisture sensor of burying underground in well should vertically be spaced apart 4m between two, bury first sensors in well 2m that staggers on vertical underground, so just reach the density of burying underground that vertically goes up a soil moisture sensor of average every 2m for these 2; The peripheral soil moisture sensor in immersion hole is mainly being undertaken the task of disclosing moisture infiltration angle and moisture diffusion process, therefore can on forefathers' Research foundation, arrange to bury underground quantity and density.The conclusion drawing by in-situ test according to forefathers, the infiltration angle of loess is roughly distributed between 30 °～60 °, and outermost infiltrates forward line can be along with the increase of immersion hole distance and sharply decline, therefore bury underground and in well superficial part soil layer, bury density underground and should be greater than deep soil layer for two of immersion hole the most close peripheral immersion hole.Along with the increase of immersion hole distance, the possibility that deep soil layer is infiltrated by moisture sharply reduces, according to forefathers' research conclusion, under immersion pit retting water condition within the scope of saturated yielding lower limit degree of depth soil layer, infiltration distance is farthest 1.5 times of radiuses, and therefore sensor is buried underground in well and only need be buried in deep more low-density soil moisture sensor underground at a distance.According to mentioned above principle, we,, through lot of experiments, have obtained following arrangement.Nearest the burying underground in well in distance immersion hole, the soil moisture sensor of superficial part should be arranged in pedal line and 30 ° and 60 ° of folded scopes of line, and in the 10m degree of depth, buries spacing underground and should not be greater than 2m, and 10m buries below spacing underground and is preferably 2～4m; All the other are buried underground in well, and the soil moisture sensor of superficial part should be embedded in this buries the intersection point place of well pedal line and 60 ° of lines underground, and the number of burying underground of soil moisture sensor is preferably 2～4m/, their equidistant burying underground.
Four, sensor is buried well underground and buried hole underground excavation and sensor are buried work underground
Should use mechanical Luoyang Spade excavation for the area that facilitates machinery to march into the arena, otherwise should hand excavation Cheng Jing.It is vertical that the borehole wall of well is buried in requirement underground, avoids as far as possible and reduce the disturbance to borehole wall soil layer in digging process.Bury well diameter underground and should be greater than 0.6m, to facilitate into, to bury the staff of sensor after well underground upper and lower.
Pore water pressure sensor needs to do pre-service before burying underground, first be screen window screen cloth folding three layers and the flattening of 4～6 times of sensor sheet areas by surface area, then sensor be placed in to center and with fine sand, sensor buried within the scope of screen cloth, finally turn up four jiaos of screen cloths guarantee sensor by fine sand parcel tight rear with band by screen cloth Corner Strapped on sensor buttock line.In the time burying underground, only the good pore water pressure sensor of pre-service need be placed in and bury well (hole) bottom underground.
Soil moisture sensor is because length own is larger, and there is exposed metal probe, signal is easily interfered, therefore bury underground appropriate to the occasion first hew out one long, wide, deeply be the large soil box of 20cm, then on the wall of this soil box inner side, the direction on parallel ground hews out length for it, wide suitable with sensor cross-section, the degree of depth is slightly larger than the little soil box of sensor length 4～6cm, then soil moisture sensor is slowly inserted in soil box, only stay buttock line outside, consider that yellow soil horizon of collapsibility, in immersion process, sedimentation will occur, therefore must in large soil box, reserve the long sensor buttock line of 1m, cause sensor to damage and monitoring accuracy loss in case sensor is formed to pulling force after solum settlement.
Because same burying underground in well will be buried at different depth place multiple sensors underground, the signal of each sensor needs to be transferred to data acquisition unit with data line, so have a large amount of numerous and disorderly data lines in well, should be concentrated tie up fixing, therefore bury sensor underground at different depth place appropriate to the occasion along same pedal line, each like this sensor buttock line will go out to bury underground outside well along a direction deeply.Binding method is with band, the line of this position to be fixed at a certain distance, then use the U-shaped iron shown in Fig. 4 by tailor's tack on the borehole wall soil body.Such fixed form can avoid hammer ram in the time of the puddled backfill soil body to scratch sensor buttock line.
After treating that all soil pressure sensors are buried underground, need bury well backfill underground and tamp all, compacting standard is advisable to reach original position soil density.
4, data acquisition
The collecting work of data should be divided into three phases:
First stage: check circuit, monitoring system trial run
Before monitoring starts, need the circuit that checks whole monitoring system to have or not short circuit, breaking phenomena, guarantee errorless rear power-on, then check that whether the function of each system component units is normal.
Subordinate phase: initial value collection
After inspection work completes, start before immersion in immersion hole, start micro voltage collector and current collector and gather respectively the initial signal value in soil layer, and initial signal value is converted into soil layer volumetric(al) moisture content and pore water pressure according to transducer calibration formula, then send to host computer.Initial value has reflected the moisture situation of soil layer before not soaking, using the starting point as later data analysis.
Phase III: the data variation monitoring after immersion
After immersion starts, the reading of each sensor will change along with the process of Water Transport, the moisture data-signal of Real-time Collection is uploaded to micro voltage and current collector by pore water pressure sensor and soil moisture sensor, and micro voltage collector and current collector are with the each passage of certain frequency search and signal is further sent to host computer.Frequency acquisition in observation process and data sum are determined by demand, generally, the frequency of data acquisition along with the propagation process of soaking time from high to low, also the data acquiring frequency while starting to soak should be higher, because now the relatively low moisture of water cut immerses the moisture situation that can change fast soil layer in soil, the inverting of Water Transport process in soil layer will be affected if now frequency acquisition is low.In the time that the rreturn value of a certain sensor fluctuates near certain numerical value, show that the moisture variation of this position is stable, now can suitably reduce frequency acquisition.For avoiding data volume redundancy, and acquisition system and post analysis are caused to burden, frequency acquisition is the highest should not be exceeded 10min/ time, and simultaneously in order not affect the precision of Water Transport process inverting, frequency acquisition is minimum should not be lower than 2h/ time.
Now, end-of-job of the present utility model.Host computer is stored and shows the data that receive.The moisture content migration of the market demand that monitoring system of the present utility model collects data under Loess Site immersion condition analyzed.
Use two kinds of data acquisition principles due to pore water pressure sensor and soil moisture sensor, its data processing method is also different.
Pore water pressure sensor is to act on the resistance strain gage in sensor by pore water pressure, so make its electric bridge share voltage change and reflect pore water pressure change.Between the output signal of pore water pressure sensor and pore water pressure, be designed to good linear relationship, but in order to improve monitoring accuracy, should again demarcate matching to sensor and obtain fitted calibration curve and corresponding fitting formula, see formula 1, wherein α equals the intercept of matched curve at pore water pressure mechanical axis, and β equals the slope of matched curve.
Calculate pore water pressure μ by formula 1:
μ=alpha+beta * X (formula 1)
In formula, μ-pore water pressure; X-sensor output signal value; α, β-fitting coefficient;
Soil moisture sensor is the volumetric(al) moisture content that the dielectric property by measuring the soil body reflects the soil body.Similar with pore water pressure sensor, the same linear relationship that has been designed between the output signal of soil moisture sensor and soil body volumetric(al) moisture content, need again demarcate and matching it in order to improve precision, see formula 2, wherein a equals the intercept of matched curve at soil layer volumetric(al) moisture content axle, and b equals the slope of matched curve.
Calculated the volumetric(al) moisture content ω of the soil body by formula 2:
ω=a+b*x (formula 2)
In formula, ω-volumetric(al) moisture content; X-sensor output signal value; A, b-fitting coefficient.
By a certain moment t
1certain the pore water pressure sensor substitution formula 1 gathering, obtains monitoring point that this sensor buries underground the pore water pressure μ in this moment
1; In the same way the sensor signal value of each collection is processed, can be obtained n group data: (μ
1, t
1), (μ
2, t
2) ... .., (μ
n, t
n);
By a certain moment t
1in the output valve substitution formula 2 of certain soil moisture sensor gathering, obtain monitoring point that this sensor buries underground the volumetric(al) moisture content ω in this moment
1, in the same way the sensor signal value of each collection is processed, can obtain n group data: (ω
1, t
1), (ω
2, t
2) ... .., (ω
n, t
n), wherein, n represents the times of collection of data in experimental period; Taking pore water pressure μ and volumetric(al) moisture content ω as the longitudinal axis, set up coordinate system taking time t as transverse axis respectively, the n group data that obtain are expressed as μ-t tense curve and ω-t tense curve in this coordinate system.Analyze these tense curves can inverting Loess Site immersion condition under inside soil body Moisture migration.
Claims (3)
1. inside soil body Water Transport monitoring system under a Loess Site immersion condition, it is characterized in that, comprise power supply, host computer, multiple pore water pressure sensor, multiple soil moisture sensor, at least one micro voltage collector, at least one current collector; Wherein, the output terminal of each pore water pressure sensor connects the input end of micro voltage collector, and the output terminal of each soil moisture sensor connects the input end of current collector, and the output terminal of micro voltage collector and current collector is connected respectively host computer; It is its power supply that power supply connects pore water pressure sensor, soil moisture sensor, micro voltage collector, current collector and host computer;
Described pore water pressure sensor is for the pore water pressure force data of inside soil body under Real-time Collection Loess Site immersion condition, described soil moisture sensor is for the soil moisture data of inside soil body under Real-time Collection Loess Site immersion condition, the data that collect send to respectively micro voltage collector and current collector, data are sent to host computer by micro voltage collector and current collector, and host computer is used for storing and showing the data that receive.
2. inside soil body Water Transport monitoring system under Loess Site immersion condition as claimed in claim 1, it is characterized in that, described pore water pressure sensor comprises the box body (6) of stainless steel, resistance strain gage (2), the top cover (5) of terminal block (3) and permeable stone material, for preventing that box body (6) is corroded box bottom and has zinc coat (1), in box body (6), be fixed with the bridge circuit and the terminal block (3) that are formed by resistance strain gage (2), the bridge circuit of resistance strain gage (2) composition is close to box body (6) inner bottom surface, described terminal block (3) is positioned at the top of the bridge circuit of resistance strain gage (2) composition, the bridge circuit of resistance strain gage (2) composition is drawn box body (6) by terminal block (3) by signal wire (4), outlet epoxy sealing, permeable stone top cover (5) enclosed box body is installed at box body (6) top.
3. inside soil body Water Transport monitoring system under Loess Site immersion condition as claimed in claim 1, it is characterized in that, described soil moisture sensor adopts FDS Series of Water sub sensor, it is made up of metal probe (7), frequency domain reflection functional circuit (8) and sensor buttock line (9), metal probe connects the input end of frequency domain reflection functional circuit (8), the output terminal connecting sensor buttock line (9) of frequency domain reflection functional circuit (8).
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| CN106596268A (en) * | 2017-01-23 | 2017-04-26 | 长安大学 | Multi-soaking condition simulation test model box and test method thereof |
| CN112129922A (en) * | 2020-09-23 | 2020-12-25 | 西安建筑科技大学 | Prediction method for water retention property of loess under soaking pore change condition |
| CN112798652A (en) * | 2020-12-04 | 2021-05-14 | 东南大学 | Method for predicting collapsibility of loess by using resistivity |
| CN112946778A (en) * | 2021-01-29 | 2021-06-11 | 中国地质科学院岩溶地质研究所 | Method for early warning karst collapse based on underground water turbidity monitoring |
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2014
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596268A (en) * | 2017-01-23 | 2017-04-26 | 长安大学 | Multi-soaking condition simulation test model box and test method thereof |
| CN106596268B (en) * | 2017-01-23 | 2020-06-05 | 长安大学 | Multi-immersion working condition simulation test model box and test method |
| CN112129922A (en) * | 2020-09-23 | 2020-12-25 | 西安建筑科技大学 | Prediction method for water retention property of loess under soaking pore change condition |
| CN112798652A (en) * | 2020-12-04 | 2021-05-14 | 东南大学 | Method for predicting collapsibility of loess by using resistivity |
| CN112798652B (en) * | 2020-12-04 | 2022-06-10 | 东南大学 | Method for predicting collapsibility of loess by using resistivity |
| CN112946778A (en) * | 2021-01-29 | 2021-06-11 | 中国地质科学院岩溶地质研究所 | Method for early warning karst collapse based on underground water turbidity monitoring |
| CN112946778B (en) * | 2021-01-29 | 2022-05-03 | 中国地质科学院岩溶地质研究所 | Method for early warning karst collapse based on underground water turbidity monitoring |
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