CN111208042A - Device and method for inverting hydraulic parameters of unsaturated waste soil - Google Patents
Device and method for inverting hydraulic parameters of unsaturated waste soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 112
- 239000002699 waste material Substances 0.000 title claims abstract description 66
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- 239000010813 municipal solid waste Substances 0.000 claims description 57
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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Abstract
The invention relates to a device and a method for inverting hydraulic parameters of unsaturated waste soil, comprising the following steps: reation kettle, constant head osmotic system, gaseous pressure steady voltage system, data acquisition system of leading to, reation kettle includes: apron, a plurality of screw rods, perforation porous disc, barrel, argil board, base, a plurality of tensiometer, a plurality of moisture content sensor, constant head infiltration system includes: cask support, fixed pulley, scale cask, infiltration collection cup, storage water tank, suction pump, gaseous pressure stabilizing system that leads to includes: air compressor machine and flowmeter, data acquisition system includes: electronic balance, data acquisition appearance and data terminal. According to the device and the method, unsaturated hydraulic characteristic parameters of the water penetration process of the waste soil can be obtained only through indoor experiments and numerical simulation, the accuracy deviation of a calculation result is small, the selected dual-permeability prediction model of the fracture domain and the matrix domain partition better conforms to the real flowing state of the water in the landfill body, and key technical parameters are provided for the evaluation of the water migration state in the landfill and the formulation of a regulation and control scheme.
Description
Technical Field
The invention relates to the technical field of rock and soil, in particular to a device and a method for inverting hydraulic parameters of unsaturated waste soil.
Background
An effective method for treating urban domestic garbage at home is a sanitary landfill method, has the advantages of large treatment capacity, wide application range, simple process, low cost and the like, and the water migration in a garbage pile of the sanitary landfill is an important factor influencing the harmlessness and the stabilization of a landfill site. Along with rainwater infiltration of natural rainfall and supply of underground water, percolate in a landfill body is subjected to the action of gravity, water reaches the underground water surface through an unsaturated soil body on the upper part of the landfill body, and a permeation process from unsaturated to saturated is performed.
The direct measurement method of the unsaturated hydraulic characteristic parameters of the waste soil has a steady-state experiment and a transient section method, but the problems of long time consumption, poor instrument precision and the like make the direct measurement method extremely difficult. Therefore, scholars at home and abroad generally measure by an indirect overflow flow method, monitor relevant data in the test process, and predict unsaturated hydraulic characteristics of soil by using relevant mathematical models of isotropy and uniformity, thereby obtaining good effects. However, compared with the conventional soil, the garbage has the characteristics of large pore ratio, strong heterogeneity and the like, and obviously, the applicability of a homogeneity prediction model is poor, so that the water flow motion parameters of large pores (fracture domains) and small pores (matrix domains) of the garbage soil are separately described, and the accuracy and the universality are higher.
A few foreign scholars have numerical inversion of unsaturated waste soil hydraulic characteristic parameters based on an overflow flow method, but certain errors and defects exist in real-time monitoring of accumulated outflow, matrix suction and water content data, the non-integrity of the data can cause non-uniqueness of inversion parameters, the errors are large, the accuracy is low, and the systematization degree of the designed whole set of device needs further improvement and perfection.
Disclosure of Invention
The invention provides a device and a method for inverting hydraulic parameters of unsaturated waste soil, which solve the problems of errors and defects of data of accumulated outflow, matrix suction and water content in real time monitoring by the existing test means, control the technical problem that the inversion parameters are not unique due to incomplete data, realize that the unsaturated hydraulic characteristics of the water dominant infiltration process of the waste soil can be obtained only through indoor experiments, solve the problem that the inversion parameters are not unique in the multistage pressure step in the experimental process, have accurate calculation results and small deviation, and better accord with the real flowing state of the water in a landfill body by using a dual-permeability prediction model of a fracture domain and a matrix domain partition, thereby having great engineering value for controlling environmental rock and soil disaster accidents, guiding and optimizing the back irrigation of leachate and an aerobic ventilation process.
The invention provides a device for inverting hydraulic parameters of unsaturated waste soil, which comprises: a reaction kettle, a constant head permeation system, a gas pressure-regulating and stabilizing system and a data acquisition system, wherein,
the reaction kettle comprises: the device comprises a cover plate, a plurality of screws, a perforated water permeable plate, a cylinder, a clay plate, a base, a plurality of tensiometers and a plurality of water content sensors, wherein the cover plate is fixed at the top of the cylinder; the base is fixed at the bottom of the cylinder body; the argil plate is arranged on the base; the screw rod penetrates through the cover plate; the perforated water permeable plate is fixed at the bottom of the screw; the plurality of tensiometers are arranged at different heights of the barrel; the moisture content sensors are symmetrically arranged on the cylinder body relative to the tensiometer; the barrel is used for filling garbage soil;
the constant head permeate system includes: the water barrel support is fixed on a test site; the fixed pulley is fixed on the bucket bracket; the scale bucket is hung on the fixed pulley through a rope; the scale bucket is communicated with the water storage tank through a water delivery pipe, and the water suction pump is arranged on the water delivery pipe; the bottom of the scale water bucket is connected with the barrel of the reaction kettle and the permeation collection cup through a three-way pipe, and the upper part of the scale water bucket is provided with an overflow port;
the gas pressure-through pressure-stabilizing system comprises: the air compressor is communicated with an air inlet of a cover plate of the reaction kettle through an air conveying pipe; the flowmeter is arranged on the gas transmission pipe;
the data acquisition system includes: the device comprises an electronic balance, a data acquisition instrument and a data terminal, wherein the permeation collection cup is placed on the electronic balance; the data acquisition instrument is electrically connected with the tensiometer and the moisture content sensor; the data terminal is electrically connected with the data acquisition instrument and the electronic balance.
Preferably, a sealing ring is arranged between the cover plate and the cylinder body; and a sealing ring is arranged between the cylinder body and the base.
Preferably, 4 screws are uniformly distributed on the cover plate in the circumferential direction.
Preferably, the moisture content sensor includes 2 tensiometers and 2 moisture content sensors, wherein 1 of the tensiometers and the corresponding moisture content sensor are disposed on the cylinder at a position 7cm away from the cover plate, and the other tensiometer and the corresponding moisture content sensor are disposed on the cylinder at a position 14cm away from the cover plate.
Preferably, the cylinder is made of a titanium alloy material; the top of the base is provided with a conical groove, the center of the groove is provided with a water outlet, and the water outlet is communicated with the three-way pipe;
preferably, an overflow port of the scale water bucket is communicated with the water storage tank through an overflow pipe; a valve is arranged on the overflow pipe; a valve is arranged at the position, close to the scale water barrel, of the three-way pipe; and a valve is also arranged at the position of the three-way pipe close to the reaction kettle.
Preferably, the maximum air outlet pressure of the air compressor is 0.7 MPa; the measuring range of the flowmeter is 0-100 KPa.
Based on the same inventive concept, the application also provides a method for inverting the hydraulic parameters of the unsaturated waste soil, which is completed by the device for inverting the hydraulic parameters of the unsaturated waste soil, and comprises the following steps:
preparing and filling a garbage soil sample;
after the garbage soil sample is compacted in the cylinder, the perforated water permeable plate and the cover plate are assembled, and the perforated water permeable plate is adjusted to a set position through the screw rod;
saturating the waste soil sample by adopting the airless water to calculate the porosity n;
calculating the saturated permeability coefficient Ks of the garbage soil sample according to Darcy's law by increasing the height of the scale bucket;
simulating the drainage of the garbage soil from a saturated state to an unsaturated state fracture area;
simulating the drainage of a matrix area of the waste soil in an unsaturated state;
substituting the drainage data into numerical software to calculate the hydraulic characteristic parameters of the waste soil represented by the double permeability models in an inversion way;
and comparing the model calculation value with the test observation value, and reasonably adjusting the inversion value to obtain the optimal and most accurate unsaturated hydraulic characteristic parameter of the waste soil.
Preferably, the preparation and filling process of the waste soil sample comprises the following steps:
putting the garbage sample taken from the landfill into an oven, and drying the garbage sample to constant at the constant temperature of 65-70 ℃;
and cutting the size of the garbage sample to 1/3 with the maximum diameter not exceeding the inner diameter of the cylinder body to obtain the garbage soil sample.
Preferably, the garbage soil sample is compacted in the cylinder body, and specifically comprises the following steps: selecting the garbage soil sample with set dry density, weighing the garbage soil sample, uniformly dividing the garbage soil sample into 5 equal parts, and compacting the garbage soil sample into a barrel of the reaction kettle in a layering manner.
Preferably, the garbage soil sample is saturated by adopting the airless water, and the method specifically comprises the following steps:
connecting the scale bucket to the reaction kettle;
adjusting the height of the scale bucket to enable the liquid level to be higher than the bottom surface of the garbage soil sample, slowly lifting the scale bucket for 1cm each time, keeping for 10 minutes, and then sequentially lifting the height of the scale bucket to the height of the perforated water permeable plate;
along with the rising of the scale bucket, water permeates upwards from the bottom of the base, so that the garbage soil sample is slowly saturated, and the water inlet volume in the saturation process is recorded, so that the porosity n is calculated.
Preferably, the simulated garbage soil is drained from a saturated state to an unsaturated state fracture domain, and specifically comprises the following steps: taking a base outlet of the reaction kettle as a flow outlet, adjusting the height of the perforated water permeable plate, discharging redundant water in the reaction kettle, and further adjusting the height of a water outlet of the scale bucket according to the height gradients of h/4, 2h/4, 3h/4 and h of the garbage soil sample, wherein h is the thickness; and monitoring the outflow amount of the water of the waste soil sample under each gravity step, and further simulating the drainage of the waste soil from a saturated state to an unsaturated state fracture area.
Preferably, the matrix drainage under the state of simulating the unsaturated state of the waste soil specifically comprises: after gravity drainage is finished, replacing a perforated water permeable plate on a base with a clay plate, closing a water outlet at the bottom of the reaction kettle, and inputting 5KPa air pressure stabilized by the air compressor and the flowmeter into the cylinder to balance the cylinder; and when the substrate suction value displayed by the tensiometer and the 5KPa error are about 2% -3%, opening a water outlet of the reaction kettle to allow water to flow out, monitoring the accumulated outflow and acquiring the substrate suction and water content change data along with time in real time, when the outflow reaches the stage and does not change any more, sequentially increasing the pressure to 5KPa, 10KPa, 20KPa, 40KPa and 70KPa, and monitoring the accumulated outflow and acquiring the substrate suction and water content change data along with time to finish the substrate domain drainage under the unsaturated state of the simulated waste soil.
Preferably, the acquiring of the hydraulic parameters in the fracture domain specifically comprises: performing inversion calculation on the porosity, the saturated permeability coefficient and the outflow data of gravity drainage in numerical software by adopting a double-permeability model for describing the water flow of the waste soil, and combining geometric parameters and initial boundary value conditions to obtain hydraulic parameters in a fracture domain; and then, inverting the outflow, matrix suction, water content data and initial boundary conditions of the dynamic multi-step outflow test to obtain hydraulic parameters in the waste soil matrix domain.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
the device has a relatively simple structure and wide application, the porosity and saturated permeability coefficient test and the outflow test can be completed in one set of device, the unsaturated hydraulic characteristic parameters of the water permeation process of the waste soil can be directly obtained through monitoring and numerical calculation of conventional data of an indoor experiment, and the systematization degree is high. The added electronic balance, tensiometer, water content sensor, clay plate and other matching components can improve the accuracy of measurement, reduce the trouble that the test cannot be developed or is slowly developed due to the shortage of some accessories, and further improve the certainty and uniqueness of inversion parameters by multiple groups of data generated by multistage gravity steps and pressure steps. Compared with a homogeneity model adopted by conventional soil, the mathematical model selected for inversion is a double-permeability model, and better conforms to the real flow of water in the garbage soil with large pore characteristics, and key technical parameters are provided for the evaluation of the internal water migration state of the garbage landfill and the formulation of a regulation and control scheme.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for inverting hydraulic parameters of unsaturated waste soil according to an embodiment of the present disclosure;
fig. 2(a) is a schematic perspective view of a reaction kettle in the apparatus for inverting hydraulic parameters of unsaturated waste soil according to the embodiment of the present application;
FIG. 2(b) is a schematic sectional view of a reaction kettle in the apparatus for inverting hydraulic parameters of unsaturated waste soil according to the embodiment of the present application;
fig. 2(c) is a structural top view of a reaction kettle in the apparatus for inverting hydraulic parameters of unsaturated waste soil according to the embodiment of the present application;
fig. 3 is a schematic structural diagram of a perforated water permeable plate in the device for inverting hydraulic parameters of unsaturated waste soil according to the embodiment of the application.
(in the figure, the parts represented by the reference numerals are 1 argil plate, 2 water content sensor, 3 perforated water permeable plate, 4 screw, 5 tensiometer, 6 graduated water bucket, 7 pulley, 8 water pump, 9 data acquisition instrument, 10 electronic balance, 11 air compressor and 12 flowmeter in sequence)
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The device mainly comprises 4 systems, as shown in figure 1, the device comprises a specially-made titanium alloy reaction kettle, a constant head permeation system, a gas pressure-introducing and pressure-stabilizing system and a data acquisition system, wherein the specially-made titanium alloy reaction kettle is a tool for filling the waste soil, and porosity, saturated permeability coefficient test, gravity drainage test and dynamic multi-step outflow test are all completed in a kettle body; the constant head infiltration system provides tests for the saturation, porosity and saturation permeability coefficient of the waste soil; the gas pressure-introducing and pressure-stabilizing system provides stable air pressure to displace water in the garbage soil in a dynamic multi-step outflow test and simulates matrix area drainage; and the data acquisition system monitors and acquires the data of the accumulated outflow, the matrix suction and the water content changing along with time in real time.
Specifically, as shown in fig. 2a, 2b and 2c, the titanium alloy reaction kettle consists of a cover plate, a screw rod 4, a perforated water permeable plate 3, a cylinder, a sensor, a clay plate 1 and a base, wherein the inner diameter of the cylinder is 206mm, the height of the cylinder is 200mm, the wall thickness of the cylinder is 13mm, and an upper opening and a lower opening are respectively embedded into the cover plate and the base and are fixed by screws and sealed by rubber gaskets. 4 screw rods 4 are screwed into the upper cover plate, a stainless steel perforated water permeable plate 3 is connected to the lower side of each screw rod 4, different compaction densities of garbage soil are provided, and the garbage is prevented from rebounding after being compacted, and the structure of the perforated water permeable plate 3 is shown in an attached drawing 3; 2 tensiometers 5 and 2 water content sensors 2 are symmetrically arranged at the positions 7cm and 14cm away from the upper cover plate, and the change of the water potential and the water content of the garbage soil in a drainage test is monitored; the upper part of the base is provided with a clay plate 1, the diameter of the clay plate is 190mm, the thickness of the clay plate is 9.3mm, small particles of garbage soil are filtered, water and air are permeated in a drainage test, and outflow is stable and air is not leaked; the base external diameter 248mm is the truncated cone structure, easily the outflow of moisture.
The constant head infiltration system takes a steel round rod with the height of 2.5m as a supporting column, the vertical rod side is fixed with the ground, a pulley 7 is installed on a horizontal rod, a scale bucket 6 is hung through a rope, different heights can be adjusted to apply different heads, two valves are arranged at the bottom and 8.5L positions of the scale bucket 6, the bottom valve can be used as a water outlet of an infiltration test, the upper valve is used as an overflow pipe flow water outlet tank, water in the water storage tank is pumped to the scale bucket 6 through a miniature water pump 8, and the constant head gradient in the seepage process is kept stable.
The gas pressure-through and pressure-stabilizing system comprises an air compressor 11 with the maximum air outlet pressure of 0.7MPa and a 0-100KPa range flow meter 12, wherein the flow meter 12 is connected to an air inlet of the reaction kettle, the knobs have different pressure values, and water in the waste soil is discharged.
The data acquisition system comprises an electronic balance 10, a data acquisition instrument 9, a computer and the like, the outflow quantity of the moisture in the waste soil is acquired by the electronic balance 10 at different pressure steps, and the suction force and the moisture content of the matrix are fed back to the computer through the data acquisition instrument 9.
Based on the same inventive concept, the invention also discloses a method for inverting the hydraulic parameters of unsaturated garbage soil, which comprises the following steps:
s1: preparing and filling a garbage soil sample: and (3) putting the garbage sample taken from the landfill into an oven, baking the garbage sample to constant temperature of 65-70 ℃, and cutting the size of the garbage sample to 1/10 with the maximum diameter not exceeding the inner diameter of the cylinder.
S2: to the rubbish soil of certain dry density, weigh the quality and divide 5 equal divisions layer upon layer and hit real to reation kettle, guarantee even atress and do not excessively extrude, closely combine between the rubbish layer, cover perforation porous disk 3 and upper cover plate, twist screw rod 4 to suitable position h in order to reach required volume to prevent the resilience of rubbish.
S3: the method is characterized in that a garbage soil sample is saturated by adopting airless water, a flow outlet pipe is connected to the lower opening of a reaction kettle, the height of a scale bucket 6 is adjusted to enable the liquid level to be slightly higher than the bottom surface of the garbage soil sample, the scale bucket 6 is slowly lifted, 1cm is kept for 10 minutes at each time, the height of the scale bucket 6 is sequentially lifted to the height of a perforated water permeable plate 3, water is enabled to upwards permeate from the bottom of a base along with the rising of the scale bucket 6, a sample is slowly saturated, the water inlet volume in the saturation process is recorded, and the porosity n is calculated.
S4: the height of the graduated water bucket 6 is continuously increased, the overflow pipe is connected into the water storage tank, the miniature water pump 8 is started to keep a constant head, the upper opening of the reaction kettle is connected to the electronic balance 10 for weighing, the data acquisition instrument 9 reads the stable values displayed by the two force meters 5 under the constant head, and the saturation permeability coefficient Ks of the waste soil under the density is calculated according to Darcy's law.
S5: taking the lower port of the reaction kettle as a flow outlet, adjusting the height of the perforated water permeable plate 3, discharging redundant water in the kettle, adjusting the height of the lower port flow outlet pipe according to the height gradient of the samples h/4, 2h/4, 3h/4 and h, monitoring the flow of water in the waste soil under each gravity step, and simulating the drainage of the waste soil from a saturated state to an unsaturated state fracture region in the step.
S6: after gravity drainage is finished, a valve at the lower opening of the reaction kettle is closed, 5KPa air pressure stabilized by an air compressor 11 and a flowmeter 12 is connected to the upper opening, so that the interior of the kettle body is slowly balanced, when the substrate suction value displayed by a tensiometer 5 and the 5KPa error are about 2% -3%, the lower opening of the reaction kettle is opened to allow water to flow out, accumulated outflow is monitored in real time, substrate suction and water content change data along with time are collected, when the outflow reaches the stage and does not change any more, the pressure steps of the air pressure values to 5KPa, 10KPa, 20KPa, 40KPa and 70KPa are sequentially increased, and the relevant data are monitored, so that the step simulates drainage of a substrate area under the unsaturated state of the waste soil.
S7: substituting the porosity, the saturated permeability coefficient and the outflow data of gravity drainage into numerical software by adopting a double-permeability model for describing the water flow of the waste soil, and carrying out numerical inversion solving by combining geometric parameters and initial boundary value conditions to obtain hydraulic parameters in a fracture area; and then inverting the water power parameters in the waste soil matrix domain by using the outflow, matrix suction, water content data and initial boundary conditions of the dynamic multi-step outflow test.
S8: and comparing the model calculation value with the test observation value, and reasonably adjusting parameters of the inversion numerical value to obtain the optimal and most accurate unsaturated hydraulic characteristic parameter of the waste soil.
The inversion of the hydraulic parameters of the unsaturated waste soil adopts an indoor test and a numerical inversion method, and the final fracture domain and matrix domain hydraulic characteristic parameters can be obtained only by sequentially calculating basic parameters including porosity, saturated permeability coefficient and the like and inversion data including accumulated outflow, matrix suction, water content and the like.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An apparatus for inverting hydraulic parameters of unsaturated waste soil, comprising: a reaction kettle, a constant head permeation system, a gas pressure-regulating and stabilizing system and a data acquisition system, wherein,
the reaction kettle comprises: the device comprises a cover plate, a plurality of screws, a perforated water permeable plate, a cylinder, a clay plate, a base, a plurality of tensiometers and a plurality of water content sensors, wherein the cover plate is fixed at the top of the cylinder; the base is fixed at the bottom of the cylinder body; the argil plate is arranged on the base; the screw rod penetrates through the cover plate; the perforated water permeable plate is fixed at the bottom of the screw; the plurality of tensiometers are arranged at different heights of the barrel; the moisture content sensors are symmetrically arranged on the cylinder body relative to the tensiometer; the barrel is used for filling garbage soil;
the constant head permeate system includes: the water barrel support is fixed on a test site; the fixed pulley is fixed on the bucket bracket; the scale bucket is hung on the fixed pulley through a rope; the scale bucket is communicated with the water storage tank through a water delivery pipe, and the water suction pump is arranged on the water delivery pipe; the bottom of the scale water bucket is connected with the barrel of the reaction kettle and the permeation collection cup through a three-way pipe, and the upper part of the scale water bucket is provided with an overflow port;
the gas pressure-through pressure-stabilizing system comprises: the air compressor is communicated with an air inlet of a cover plate of the reaction kettle through an air conveying pipe; the flowmeter is arranged on the gas transmission pipe;
the data acquisition system includes: the device comprises an electronic balance, a data acquisition instrument and a data terminal, wherein the permeation collection cup is placed on the electronic balance; the data acquisition instrument is electrically connected with the tensiometer and the moisture content sensor; the data terminal is electrically connected with the data acquisition instrument and the electronic balance.
2. The apparatus for inverting hydraulic parameters of unsaturated waste soil according to claim 1, comprising 2 said tensiometers and 2 said moisture content sensors, wherein 1 said tensiometer and corresponding said moisture content sensor are disposed on said cylinder at a distance of 7cm from said cover plate, and another said tensiometer and corresponding said moisture content sensor are disposed on said cylinder at a distance of 14cm from said cover plate.
3. The apparatus for inverting hydraulic parameters of unsaturated waste soil according to claim 1, wherein the cylinder is made of titanium alloy material; the top of the base is provided with a conical groove, the center of the groove is provided with a water outlet, and the water outlet is communicated with the three-way pipe; an overflow port of the scale bucket is communicated with the water storage tank through an overflow pipe; a valve is arranged on the overflow pipe; a valve is arranged at the position, close to the scale water barrel, of the three-way pipe; and a valve is also arranged at the position of the three-way pipe close to the reaction kettle.
4. A method for inverting hydraulic parameters of unsaturated waste soil is achieved by the device for inverting the hydraulic parameters of unsaturated waste soil, which is disclosed by any one of claims 1-3, and comprises the following steps:
preparing and filling a garbage soil sample;
after the garbage soil sample is compacted in the cylinder, the perforated water permeable plate and the cover plate are assembled, and the perforated water permeable plate is adjusted to a set position through the screw rod;
saturating the waste soil sample by adopting the airless water to calculate the porosity n;
calculating the saturated permeability coefficient Ks of the garbage soil sample according to Darcy's law by increasing the height of the scale bucket;
simulating the drainage of the garbage soil from a saturated state to an unsaturated state fracture area;
simulating the drainage of a matrix area of the waste soil in an unsaturated state;
substituting the data of outflow, moisture, water potential and the like monitored in the drainage process into numerical software to calculate the unsaturated hydraulic characteristic parameters of the waste soil described by the double-permeability model in an inversion way;
and comparing the model calculation value with the test observation value, and reasonably adjusting the inversion parameters to obtain the optimal and most accurate unsaturated hydraulic characteristic parameters of the waste soil.
5. The method for inverting hydraulic parameters of unsaturated waste soil according to claim 4, wherein the preparation and filling process of the waste soil sample comprises:
putting the garbage sample taken from the landfill into an oven, and drying the garbage sample to constant at the constant temperature of 65-70 ℃;
and cutting the size of the garbage sample to be less than 1/3 of the inner diameter of the cylinder body to obtain the garbage soil sample.
6. The method for inverting hydraulic parameters of unsaturated waste soil according to claim 4, wherein the waste soil sample is compacted in the cylinder, specifically: selecting the garbage soil sample with set dry density, weighing the garbage soil sample, uniformly dividing the garbage soil sample into 5 equal parts, and compacting the garbage soil sample into a barrel of the reaction kettle in a layering manner.
7. The method for inverting hydraulic parameters of unsaturated waste soil according to claim 4, wherein the waste soil sample is saturated with no water, specifically:
connecting the scale bucket to the reaction kettle;
adjusting the height of the scale bucket to enable the liquid level to be higher than the bottom surface of the garbage soil sample, slowly lifting the scale bucket for 1cm each time, keeping for 10 minutes, and then sequentially lifting the height of the scale bucket to the height of the perforated water permeable plate;
along with the rising of the scale bucket, water permeates upwards from the bottom of the base, so that the garbage soil sample is slowly saturated, and the water inlet volume in the saturation process is recorded, so that the porosity n is calculated.
8. The method for inverting the hydraulic parameters of unsaturated waste soil according to claim 4, wherein the simulating of waste soil drainage from a saturated state to an unsaturated state fracture zone specifically comprises: taking a base outlet of the reaction kettle as a flow outlet, adjusting the height of the perforated water permeable plate, discharging redundant water in the reaction kettle, and further adjusting the height of a water outlet of the scale bucket according to the height gradients of h/4, 2h/4, 3h/4 and h of the garbage soil sample, wherein h is the thickness; and monitoring the outflow amount of the water of the waste soil sample under each gravity step, and further simulating the drainage of the waste soil from a saturated state to an unsaturated state fracture area.
9. The method for inverting the hydraulic parameters of unsaturated waste soil according to claim 4, wherein the simulating the drainage of the matrix area of the waste soil in the unsaturated state comprises: after gravity drainage is finished, replacing a perforated water permeable plate on a base with a clay plate, closing a water outlet at the bottom of the reaction kettle, and inputting 5KPa air pressure stabilized by the air compressor and the flowmeter into the cylinder to balance the garbage earth pillar; and when the substrate suction value displayed by the tensiometer and the 5KPa error are about 2% -3%, opening a water outlet of the reaction kettle to allow water to flow out, monitoring the accumulated outflow and acquiring the substrate suction and water content change data along with time in real time, and when the outflow is stable and does not change any more, sequentially increasing the pressure to 5KPa, 10KPa, 20KPa, 40KPa and 70KPa, and monitoring the accumulated outflow and acquiring the substrate suction and water content change data along with time to finish the substrate domain drainage under the unsaturated state of the simulated waste soil.
10. The method for inverting hydraulic parameters of unsaturated waste soil according to claim 4, wherein the obtaining of hydraulic parameters in fracture zones is specifically: adopting a double-permeability model for describing the water flow of the waste soil, and carrying out numerical inversion solving on the porosity, the saturated permeability coefficient and the outflow data of gravity drainage by combining geometric parameters and initial boundary value conditions to obtain hydraulic parameters in a fracture area; and then, inverting the outflow, matrix suction, water content data and initial boundary conditions of the dynamic multi-step outflow test to obtain hydraulic parameters in the waste soil matrix domain.
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