CN114991117A - Humidification structure for humidifying loess foundation by using water vapor and construction method - Google Patents
Humidification structure for humidifying loess foundation by using water vapor and construction method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000010276 construction Methods 0.000 title claims abstract description 16
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- 238000012360 testing method Methods 0.000 claims description 7
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- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
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- 239000004744 fabric Substances 0.000 description 2
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- 235000011941 Tilia x europaea Nutrition 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
Abstract
The invention discloses a humidifying structure for humidifying loess foundation by using steam and a construction method, relating to the technical field of land humidification, and according to one aspect of the invention, a humidifying system and a pressure regulating system are adopted, wherein the humidifying system conducts moisture to the pressure regulating system through a steam connecting pipe, and the pressure regulating system conducts the moisture to the loess foundation to be humidified; the pressure regulating system is arranged on the loess foundation to be humidified through an impact device. The invention generates steam through the full-automatic steam generator, and the steam enters the soil body through the humidifying pipe, thereby not only reducing the use amount of water, but also having obvious humidifying effect in the soil body, namely, the moisture content is uniformly distributed after the soil body is humidified. The invention can generate steam through the full-automatic steam generator, can continuously work after the pressure and the ventilation time of the introduced steam are determined according to the working conditions, and can completely meet the requirement of treating loess foundations with different thicknesses by selecting the full-automatic steam generator with proper power according to the requirement.
Description
Technical Field
The invention relates to the technical field of land humidification, in particular to a humidification structure for humidifying loess foundation by using water vapor and a construction method.
Background
The scale of the foundation construction in the northwest area is continuously enlarged, various engineering constructions are continuously emerged, and the deformation characteristic of loess, which is the main regional soil quality in the northwest area of China, has very important significance on the stability and safety of various buildings constructed in the northwest area, so that the loess has been widely regarded by the geotechnical engineering industry.
The loess accumulation era in China includes the whole fourth era and is mainly distributed between 33 degrees and 47 degrees of north latitude, wherein loess in the area between 34 degrees and 45 degrees is the most developed, the thickness is the largest, and the stratum is the fullest. In the area, the general climate is dry, the rainfall is less, the evaporation capacity is large, the area belongs to a drought type and a semi-arid type, and the annual average rainfall in the loess distribution area is 250-600 mm. Taking the Lanzhou area as an example, the average rainfall is about 327mm, which is far lower than the annual average evaporation amount 1448mm, which causes the water content of the soil body in the northwest loess area to be lower and drier, generally between 3% and 8%.
The specification stipulates that when the dynamic compaction method is adopted to treat the collapsible loess foundation with the natural water content of less than 10 percent, the foundation is preferably humidified to the optimal water content. Both field tests and indoor tests show that when the water content of the soil body is close to or reaches the optimal water content, the tamping effect is optimal.
The humidification of collapsible loess adopts the presoaking method on the scene more, divide into again to different operating mode characteristics: a diffusion irrigation method, a water injection hole water injection method and a depth and depth combined moisturizing method. The pre-soaking method can eliminate the self-weight collapsibility of the soil layer, has the advantages of simplicity, economy, easy operation and the like, but has the defects of longer construction period and increased treatment cost, and particularly has certain difficulties in solving water sources for channel engineering, long lines and large engineering quantity. Meanwhile, the loess foundation treated by the pre-soaking method has the conditions that the water content can not be controlled and the distribution is not uniform. The appearance of the novel humidification technology, namely the humidification of loess by high-temperature and high-pressure steam, provides a new idea and a problem solving method for humidifying collapsible loess.
Although the method for humidifying unsaturated loess by steam obtains certain theoretical research through indoor tests, the research on field application is insufficient, so that it is necessary to perform field tests to explore the change rule of a temperature field and a water content field in loess under the combined action of steam pressure, temperature and water content, and the final distribution condition of the temperature and the water content of a soil body after humidification is finished.
Disclosure of Invention
Aiming at the problems, the invention provides a humidifying structure for humidifying a loess foundation by using steam and a construction method, which solve the problem of inconvenient humidification of the loess foundation in the prior art.
According to one aspect of the invention, a humidifying structure for humidifying loess foundation by using water vapor is provided, which comprises a humidifying system and a pressure regulating system, wherein the humidifying system conducts the moisture to the pressure regulating system through a water vapor connecting pipe, and the pressure regulating system conducts the moisture to the loess foundation to be humidified; the pressure regulating system is installed on the loess foundation to be humidified through an impact device.
The pressure regulating system comprises a water vapor pressure regulating valve, a water vapor flowmeter, an electronic pressure gauge and a humidifying pipe; the humidifying system is connected with a humidifying pipe through a water vapor connecting pipe, a water vapor pressure regulating valve, a water vapor flow meter and an electronic pressure gauge are respectively installed on the water vapor connecting pipe, and the humidifying pipe is installed on a loess foundation to be humidified through an impact device.
The humidifying system is connected with the pipe body through a steam connecting pipe, the pipe body is detachably mounted on a loess foundation to be humidified, the pipe body is connected with the steam connecting pipe through the steam connector, the tail of the pipe body is provided with the end, a plurality of uniformly distributed humidifying holes are formed in the pipe body, and the end is detachably connected with the impact device.
The impact device comprises a hammer clamp, a drop hammer and a hammer rod; the detachable of end top is equipped with matched with hammer block, be connected with the hammer stem on the hammer block, the hammer stem overcoat is equipped with sliding connection's the hammer that falls, the hammer that falls can be dismantled with the hammer block and be connected.
And the two sides of the drop hammer are externally provided with matched operation ladders.
The pipe body is a seamless steel pipe with the length of 3.5m, the outer diameter of 48.3mm and the wall thickness of 3.6mm, a plurality of evenly distributed scale marks are arranged on the pipe body within the range of 1.5m away from the end head, and the unit of the scale marks is 0.5 m.
The humidifying holes are arranged in a range 2m away from the bottom of the humidifying pipe body, the diameter of each humidifying hole is 10mm, the number of the humidifying holes on the same section of the pipe body is four, and the four humidifying holes are symmetrically arranged and distributed at intervals of 25cm along the length direction of the pipe body.
According to another aspect of the present invention, there is provided a method for constructing a loess foundation through humidification of water vapor, comprising the steps of:
s1: determining the range of the loess foundation to be humidified, arranging humidifying pipes according to 4 multiplied by 4m to obtain the number of the humidifying pipes to be humidified, and preprocessing the humidifying pipes;
s2: leveling the loess foundation to be leveled, and marking the position of a humidifying point after leveling;
s3: carrying out a water vapor test on the humidifying system, the water vapor connecting pipe and the pressure regulating system, and checking the air leakage condition;
s4: erecting a stand-by pipe body at the position of a humidifying point, arranging operation ladders outside two sides of the position of the humidifying point, installing a hammer rod and a drop hammer, and connecting the hammer rod and an end head through a hammer clamp;
s5: repeatedly and freely falling on the hammer rod through the drop hammer to slide and impact the pipe body to be used, so that the pipe body to be used is impacted into the loess foundation to be humidified, and the hammering is stopped at the position, 50cm away from the loess foundation ground, of the top end of the pipe body, and the impact device is removed;
s6: the humidifying system is connected with the pressure regulating system through a water vapor connecting pipe, the humidifying system (7) is controlled to conduct moisture to the pressure regulating system, and the moisture is conducted to a humidifying point through the pressure regulating system;
s7: sequentially carrying out the same operations as S4-S6, and introducing water vapor into humidification points at other positions;
s8: and (4) planing loess by taking the humidifying points as connecting lines, taking loess soil samples at different depths and different plane positions after humidification to measure the water content of the loess soil samples, and evaluating the humidifying effect.
The step S5 further comprises that the standby pipe body is wrapped with flexible air-permeable body.
S6, the method also includes that the local part of the loess foundation leaks air, the soil in the area is dug out, the bentonite is backfilled and tamped, and water vapor is continuously introduced.
The invention has the advantages that:
according to the structure of the humidifying pipe, preprocessing is carried out according to the quantity required on site, so that the specification and the quality of the humidifying pipe are not influenced, and the construction period can be shortened to a certain extent. Because the traditional humidification method, such as the presoaking method, is simple, economical and easy to operate, but the period is longer, the treatment cost is increased, and the water source problem is difficult to solve in areas with large treatment range and water shortage. According to the construction method provided by the invention, steam is generated by the full-automatic steam generator and enters the soil body through the humidifying pipe, so that the using amount of water is reduced, and the humidifying effect in the soil body is obvious, namely, the moisture content is uniformly distributed after the soil body is humidified;
according to the invention, the full-automatic steam generator generates steam, the steam can continuously work after the pressure and the ventilation time of the introduced steam are determined according to working conditions, and the full-automatic steam generator with proper power is selected according to requirements, so that different treatment requirements on loess foundations with different thicknesses can be completely met;
the diameter and length of the humidifying pipe, the size and the distance of the opening on the pipe wall can be adjusted according to the actual needs of the site. In addition, the humidifying pipe can be recycled for multiple times after humidifying is finished, so that the cost is saved to a certain extent, and the waste of resources is avoided;
the humidifying method of the invention can be used for humidifying other soil loess foundations with low water content and needing dynamic compaction treatment in the follow-up process besides the humidifying loess foundation;
the main advantage of the humidifying method of the invention is that a new humidifying method for processing loess foundation is provided, which has important guiding significance in practical application.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is an overall schematic view of a humidifying structure of example 1 of the present invention;
FIG. 2 is an elevational view of a humidifying pipe in example 1 of the present invention;
fig. 3 is a schematic diagram of a hammering process in embodiment 1 of the present invention;
FIG. 4 is an elevational view of an impact device according to embodiment 1 of the present invention;
FIG. 5 is an elevation view of a sample taken after the humidification of the loess foundation according to example 2 of the present invention;
FIG. 6 is an elevation view of a calculation model according to embodiment 3 of the present invention;
FIG. 7 is a graph showing the water content distribution after 48 hours of steam aeration in example 3 of the present invention;
FIG. 8 is a graph of the points measured along the x-axis when y =3.5m in example 3 of the present invention;
FIG. 9 is a graph of relative humidity versus time at various points when y =3.5m for example 3 of the present invention;
FIG. 10 is a plot of the points along the y-axis for x =3.475 according to an embodiment of the present invention;
FIG. 11 is a graph of relative humidity versus time for various points at x =3.475 in accordance with an embodiment of the present invention.
Reference numerals:
the device comprises a loess foundation 1, a humidifying pipe 21, a humidifying hole 22, a steam joint 23, an end 24, a steam pressure regulating valve 3, a steam flowmeter 4, a steam connecting pipe 5, an electronic pressure gauge 6, a humidifying system 7, a hammer clamp 81, a drop hammer 82, a hammer rod 83 and an operation ladder 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1 to 4, a humidifying structure for humidifying loess foundation by using steam, comprising a humidifying system 7 and a pressure regulating system, wherein the humidifying system 7 generates moisture, preferably the humidifying system 7 is a full-automatic steam generator, the full-automatic steam generator 7 is a paletton brand with model number pld (k)0.1-0.7, rated power 72KW and rated pressure 0.7MPa, the humidifying system 7 conducts the moisture to the pressure regulating system through a steam connecting pipe 5, the steam connecting pipe 5 is an explosion-proof flexible connecting pipe, and the pressure regulating system conducts the moisture to the loess foundation to be humidified; the pressure regulating system is arranged on a loess foundation to be humidified through an impact device; the pressure regulating system comprises a water vapor pressure regulating valve 3, a water vapor flowmeter 4, an electronic pressure gauge 6 and a humidifying pipe 21; the humidifying system 7 is connected with a humidifying pipe 21 through a water vapor connecting pipe 5, a water vapor pressure regulating valve 3, a water vapor flowmeter 4 and an electronic pressure gauge 6 are respectively installed on the water vapor connecting pipe 5, wherein the water vapor pressure regulating valve 3 adopts an American Jielike GENTEC 152 series pressure reducing valve with the model number of 152Q-25 and the output pressure of 0.03-0.85 MPa, the water vapor flowmeter 4 adopts a thermal gas mass flowmeter with the model number of JH-3000 plus 300, and the measuring range is as follows: 0.05-120m/s, working temperature: working temperature: -40 ℃ -510 ℃, precision: 1% reading ± 0.5% full scale; the electronic pressure gauge 6 is an HD _100GZ axial digital pressure gauge of a Chinese H instrument, and the measuring range is 0-1 MPa; the humidifying pipe 21 is arranged on a loess foundation to be humidified through an impact device; the humidifying pipe 21 comprises a water vapor joint 23, an end 24 and a pipe body, the humidifying system 7 is connected with the pipe body through a water vapor connecting pipe 5, the pipe body is detachably mounted on a loess foundation to be humidified, the pipe body is connected with the water vapor connecting pipe 5 through the water vapor joint 23, the water vapor joint 23 is arranged on the pipe body at the position 3cm below the end, and the water vapor joint is a pipe joint with the diameter of 12 mm; the tail part of the pipe body is fixedly connected with an end head 24, the other end head 24 is a steel base plate with the size of 100 multiplied by 20mm, the end head 24 has the function of preventing the end part of the pipe body from deforming under the impact action in the process that impact equipment impacts a loess foundation, in addition, the end part of the pipe body can be blocked, the pipe body is a seamless steel pipe with the length of 3.5m, the outer diameter of 48.3mm and the wall thickness of 3.6mm, a plurality of evenly distributed scale marks are arranged on the pipe body within 1.5m away from the end head, and the unit of the scale marks is 0.5 m; the pipe body is provided with a plurality of uniformly distributed humidifying holes 22, preferably, a plurality of humidifying holes 22 are arranged in a range of 2m from the bottom of the pipe body, the diameter of each humidifying hole 22 is 10mm, the number of the humidifying holes 22 on the same section of the pipe body is four, and the four humidifying holes 22 are symmetrically arranged and distributed at intervals of 25cm along the length direction of the pipe body; the end head 24 is detachably connected with the impact device; the impact device comprises a hammer clamp 81, a drop hammer 82 and a hammer rod 83; the top of the end head 24 is detachably provided with a matched hammer clamp 81, and the hammer clamp 81 is a steel backing plate with the size of 100 multiplied by 20 mm; the hammer clamp 81 is fixedly connected with a hammer rod 83, the hammer rod 83 is a smooth steel bar with the diameter of 22mm and the length of 150cm, a drop hammer 82 in sliding connection is sleeved outside the hammer rod 83, the inner diameter of the drop hammer 82 is 25mm, the mass of the drop hammer is 20Kg, the drop hammer 82 is detachably connected with the hammer clamp 81, and the condition that a pipe body can be hit into a loess foundation to be humidified by a free falling body after the drop hammer 83 is lifted is ensured; the matched operation ladder 9 is arranged outside the two sides of the drop hammer 82, the operation ladder 9 enables an operation platform to be provided for constructors in the hammering process, and the operation ladder 9 is an elevator.
The invention provides a humidifying structure for humidifying loess foundation by using steam, when in use, two operation ladders 9 are arranged at two sides of a humidifying point, a pipe body is erected on the humidifying point, a constructor penetrates a hammer rod 83 through a drop hammer 82 and lifts to the height of an end head 24, the hammer clip 81 is connected with the end head 24 to ensure that the pipe body and the axis of the hammer rod 83 are on the same vertical line, the drop hammer 82 is lifted to a position 1.2m away from the hammer clip and falls freely, the operation ladders 9 adjust the height along with the pipe body gradually hitting the loess foundation, when the end head is 1.5m away from the ground, the lifting height of the drop hammer 82 is reduced, and finally when the end head 24 is 0.5m away from the ground, hammering is stopped, and hammering operation is completed; the full-automatic water vapor generator is powered on, a safety valve of the full-automatic water vapor generator is turned off at the beginning, when a pressure gauge on the full-automatic water vapor generator shows 650KPa, the safety valve is slowly opened to enable water vapor to pass through each device, whether each device works normally is checked, a water vapor pressure regulating valve is regulated to enable passing gas to be stable at 650KPa, whether the numerical value of an electronic pressure gauge corresponds to the electronic pressure gauge is checked, the water vapor enters a loess foundation through a humidifying hole (22) of the pipe body, and the water vapor stops being introduced after 48 hours.
Example 2
A construction method of a water vapor humidifying loess foundation comprises the following steps:
s1: determining the range of the loess foundation to be humidified, namely the range of the loess foundation to be humidified, arranging humidifying pipes according to 4 multiplied by 4m to obtain the number of the humidifying pipes to be humidified, and preprocessing the humidifying pipes, wherein the preprocessing is to process the humidifying pipes by a professional company, so that the quality can be ensured, and the cost is saved to a certain extent;
s2: leveling the loess foundation to be leveled, and marking the position of a humidifying point after leveling; leveling the loess foundation, marking the position of a humidifying point by using lime after the leveling operation is finished, and then positioning an impact device and a humidifying pipe;
s3: the humidification system, the steam connecting pipe and the pressure regulating system are subjected to a water steam test, the air leakage condition is checked, and the air leakage of equipment in the field implementation process is prevented;
the method specifically comprises the following steps: the full-automatic water vapor generator is powered on, a safety valve of the full-automatic water vapor generator is turned off at the beginning, when a pressure gauge on the full-automatic water vapor generator shows 650KPa, the safety valve is slowly opened to enable water vapor to pass through each device, and whether each device works normally is checked;
adjusting the water vapor pressure adjusting valve to stabilize the passing gas at 650KPa, and checking whether the value of the electronic pressure gauge corresponds to the value of the pressure gauge;
s4: erecting a pipe body to be used at a humidifying point position, placing operation ladders outside two sides of the humidifying point position, installing a hammer rod and a drop hammer, and connecting the hammer rod and the drop hammer with an end head through a hammer clamp; the method specifically comprises the following steps: the elevator is distributed on two sides of the position of a humidifying point, the humidifying pipe is erected on the humidifying point, a constructor penetrates a hammer rod to lift the hammer rod to the height of an end head, the hammer rod is connected with the end head through a hammer clamp, and in addition, a scale mark is drawn according to 0.5m within the range of 1.5m of the end head of the humidifying pipe;
s5: repeatedly and freely falling on the hammer rod through the drop hammer to slide and impact the pipe body to be used, so that the pipe body to be used is impacted into the loess foundation to be humidified, and the hammering is stopped at the position, 50cm away from the loess foundation ground, of the top end of the pipe body, and the impact device is removed;
the method specifically comprises the following steps: after the hammer clamp is connected with the end head, the pipe body and the axis of the hammer rod are ensured to be on the same vertical line, and the falling hammer is lifted to a position 1.2m away from the hammer clamp to fall freely at the beginning. The height of the elevator is adjusted along with the pipe body gradually hitting the loess foundation, when the distance between the end head and the ground is 1.5m, the lifting height of the drop hammer is reduced, and finally when the distance between the end head and the ground is 0.5m, the hammering is stopped, and the hammering operation is completed;
in the implementation process, except that the humidifying pipe and the hammer rod are ensured to be on the same axis, the loess foundation at the position of the elevator is required to be treated, and accidents occur in the mode operation process.
S6: the humidifying system is connected with the pressure regulating system through a steam connecting pipe, and the full-automatic steam generator, the steam pressure regulating valve, the steam flowmeter, the electronic pressure gauge and the steam joint are sequentially connected through the steam connecting pipe; controlling the humidifying system to conduct the moisture to the pressure regulating system, and conducting the moisture to the humidifying point through the pressure regulating system; the water vapor enters the loess foundation through the humidifying pipe, and the water vapor is stopped to be introduced after 48 hours; during the ventilation process, the local air leakage of the loess foundation occurs, the soil in the area is dug out, then the bentonite is backfilled and tamped, and the water vapor is continuously introduced; in the step, when the pressure meter and the pressure controller of the full-automatic steam generator display numerical values which are slightly larger than the pressure of the steam introduced into the loess foundation according to the design requirement, a safety valve on the full-automatic steam generator is opened, and the steam pressure valve is adjusted when the steam passes through a steam pressure adjusting valve, so that the pressure of the passing steam reaches the designed introduced pressure value and is stably introduced; meanwhile, the pressure value of the introduced steam is monitored by an electronic pressure gauge, and the pressure value is adjusted in time when the deviation is found.
S7: the operation is the same as that of S4-S6, and water vapor is introduced into humidification points at other positions;
after the ventilation is finished, firstly closing a safety valve on the full-automatic steam generator, then sequentially removing the connection between a steam connecting pipe and the full-automatic steam generator and the humidifying pipe, so that the steam connecting pipe is respectively disconnected with a steam joint and the full-automatic steam generator, pulling out the humidifying pipe after the disconnection for humidifying the next point, wherein the humidifying step is as shown in the specification;
s8: planing loess with the humidifying point as a connecting line, taking loess soil samples at different depths and different plane positions after humidifying, measuring the water content, and evaluating the humidifying effect;
the method specifically comprises the following steps: after the ventilation of all the humidifying points is finished, taking a plurality of humidifying points, respectively arranging a sampling line in the longitudinal direction and the transverse direction, cutting by using an excavator, then respectively taking soil samples along different vertical positions and transverse positions, measuring the water rate after the humidification of water vapor, and additionally taking soil samples at the edge to measure the initial water rate value;
referring to fig. 5, the main purpose of sampling is to evaluate the moisture content change condition of the humidified loess foundation, whether the moisture content meets the construction requirement, and whether the next process construction is performed.
In an embodiment of the present invention, in the above S5, the tube to be used is wrapped with a flexible permeable gas, and the flexible permeable gas is a cloth, that is, in order to prevent soil particles from entering the tube during the process of hammering into the tube, a layer of cloth is wrapped around the tube.
Example 3
Referring to fig. 6 to 11, in order to verify the effect of humidifying loess foundation with water vapor according to the present invention, the following numerical simulations were performed:
setting loess foundation parameters: ρ =1609Kg/m 3 Constant pressure heat capacity C =966J/(Kg · K), porosity e =0.441, permeability k =10 × 10 -5 m 2 Initial relative humidity ψ =5%, initial temperature T =10 ℃.
The model is a two-dimensional model, and the model width w =18m and the soil body thickness h =5m are set.
The diameter phi of the humidifying pipe is =50mm, three humidifying pipes are arranged for humidifying, and the distance between the humidifying pipes is 4 m. The diameter phi of the humidifying holes is =10mm, the distance between the humidifying holes is 25cm along the length direction of the humidifying pipe, and two humidifying holes are arranged on the same plane of the humidifying pipe. To simplify the model, the length of the humidifying pipe is taken into the loess foundation and includes a two meter range of humidifying holes.
Referring to fig. 6, in which 1 is a loess foundation, 21 is a humidifying pipe, and 22 is a humidifying hole, each size represents a different component.
And (3) beginning to introduce water vapor into the soil body, setting the water vapor pressure P =650KPa, stopping introducing the air after 48h of introducing the air, and analyzing the result.
According to the calculation result of the model, the loess foundation is humidified by introducing water vapor for 48 hours, and then the humidifying range is continuously expanded by taking the humidifying pipe as the center. The effect of humidifying the loess soil body between the humidifying pipes is most obvious. In the calculation results of the model, the maximum relative humidity value after humidification is 70%, the relative initial relative humidity is 5%, and the growth rate is 140%.
Referring to fig. 11, the relative humidity of the soil changes with the position away from the humidifying pipe, and the larger the relative humidity of the soil close to the humidifying pipe is, the smaller the relative humidity of the soil increases with the distance away, and finally the relative humidity does not change.
The results of the embodiment of the invention show that the steam humidifying loess foundation has the characteristics of short time, obvious humidifying effect and uniform distribution after humidification compared with the soaking method. Therefore, the invention can be applied and implemented in the humidification treatment of the loess foundation.
According to the structure of the humidifying pipe, preprocessing is carried out according to the quantity required on site, so that the specification and the quality of the humidifying pipe are not influenced, and the construction period can be shortened to a certain extent. Because the traditional humidification method, such as the presoaking method, is simple, economical and easy to operate, but the period is longer, the treatment cost is increased, and the water source problem is difficult to solve in areas with large treatment range and water shortage. According to the construction method provided by the invention, steam is generated by the full-automatic steam generator and enters the soil body through the humidifying pipe, so that the using amount of water is reduced, and the humidifying effect in the soil body is obvious, namely, the moisture content is uniformly distributed after the soil body is humidified;
according to the invention, the full-automatic steam generator generates steam, the steam can continuously work after the pressure and the ventilation time of the introduced steam are determined according to working conditions, and the full-automatic steam generator with proper power is selected according to requirements, so that different treatment requirements on loess foundations with different thicknesses can be completely met;
the diameter and length of the humidifying pipe, the size and the distance of the opening on the pipe wall can be adjusted according to the actual needs of the site. In addition, the humidifying pipe can be recycled for multiple times after humidifying is finished, so that the cost is saved to a certain extent, and the waste of resources is avoided;
the humidifying method of the invention can be used for humidifying other soil loess foundations with low water content and needing dynamic compaction treatment in the follow-up process, besides the humidifying loess foundation;
the main advantage of the humidifying method of the invention is that a new humidifying method for processing loess foundation is provided, which has important guiding significance in practical application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A humidifying structure for humidifying loess foundation by using water vapor is characterized by comprising a humidifying system (7) and a pressure regulating system, wherein the humidifying system (7) conducts the moisture to the pressure regulating system through a water vapor connecting pipe (5), and the pressure regulating system conducts the moisture to the loess foundation to be humidified; the pressure regulating system is arranged on the loess foundation to be humidified through an impact device.
2. The structure of claim 1, wherein the pressure regulating system comprises a steam pressure regulating valve (3), a steam flow meter (4), an electronic pressure gauge (6) and a humidifying pipe (21); humidification system (7) are connected with humidifying pipe (21) through vapor connecting pipe (5), install vapor pressure regulating valve (3), vapor flowmeter (4) and electron pressure meter (6) on vapor connecting pipe (5) respectively, humidifying pipe (21) are installed on waiting to humidify the loess foundation through impulsive unit.
3. The structure of claim 2, wherein the humidifying pipe (21) comprises a water vapor joint (23), an end (24) and a pipe body, the humidifying system (7) is connected with the pipe body through the water vapor connecting pipe (5), the pipe body is detachably mounted on the loess foundation to be humidified, the pipe body is connected with the water vapor connecting pipe (5) through the water vapor joint (23), the end (24) is arranged at the tail of the pipe body, a plurality of uniformly distributed humidifying holes (22) are formed in the pipe body, and the end (24) is detachably connected with the impact device.
4. The structure for humidifying a loess foundation with water vapor according to claim 3, wherein the impact means comprises a hammer catch (81), a drop hammer (82), and a hammer rod (83); end (24) top detachable is equipped with matched with hammer card (81), be connected with hammer stem (83) on hammer card (81), hammer stem (83) overcoat is equipped with sliding connection's hammer (82) that falls, hammer (82) and hammer card (81) can be dismantled and be connected.
5. The humidification structure for humidifying the loess foundation with water vapor according to claim 4, wherein a cooperating operation ladder (9) is provided outside both sides of the drop hammer (82).
6. The humidification structure for humidifying a loess foundation with water vapor according to claim 3, wherein the pipe body is a seamless steel pipe having a length of 3.5m, an outer diameter of 48.3mm and a wall thickness of 3.6mm, and a plurality of evenly distributed scale marks are provided on the pipe body within 1.5m from the tip, the unit of the scale marks being 0.5 m.
7. The humidification structure for humidifying a loess foundation with water vapor according to claim 6, wherein a plurality of the humidifying holes (22) are provided within a range of 2m from the bottom of the humidifying pipe body, the diameter of the humidifying holes (22) is 10mm, the number of the humidifying holes (22) on the same section of the pipe body is four, and four humidifying holes (22) are symmetrically arranged at intervals of 25cm along the length direction of the pipe body.
8. A construction method of a water vapor humidifying loess foundation is characterized by comprising the following steps:
s1: determining the range of the loess foundation to be humidified, arranging humidifying pipes according to 4 multiplied by 4m to obtain the number of the humidifying pipes to be humidified, and preprocessing the humidifying pipes;
s2: leveling the loess foundation to be leveled, and marking the position of a humidifying point after leveling;
s3: carrying out a water vapor test on the humidifying system, the water vapor connecting pipe and the pressure regulating system, and checking the air leakage condition;
s4: erecting a pipe body to be used at a humidifying point position, placing operation ladders outside two sides of the humidifying point position, installing a hammer rod and a drop hammer, and connecting the hammer rod and the drop hammer with an end head through a hammer clamp;
s5: repeatedly and freely falling on the hammer rod through the drop hammer to slide and impact the pipe body to be used, so that the pipe body to be used is impacted into the loess foundation to be humidified, and the hammering is stopped at the position, 50cm away from the loess foundation ground, of the top end of the pipe body, and the impact device is removed;
s6: the humidifying system is connected with the pressure regulating system through a water vapor connecting pipe, the humidifying system (7) is controlled to conduct moisture to the pressure regulating system, and the moisture is conducted to a humidifying point through the pressure regulating system;
s7: sequentially carrying out the same operations as S4-S6, and introducing water vapor into humidification points at other positions;
s8: and (4) planing loess by taking the humidifying points as connecting lines, taking loess soil samples at different depths and different plane positions after humidification to measure the water content of the loess soil samples, and evaluating the humidifying effect.
9. The method of claim 8, wherein said step S5 further comprises wrapping said pipe with a flexible gas-permeable material.
10. The method of claim 8, wherein said step S6 comprises removing soil in said area, tamping with backfilled bentonite, and continuing to supply water vapor.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1506023A1 (en) * | 1988-01-21 | 1989-09-07 | Запорожское Отделение Научно-Исследовательского Института Строительных Конструкций Госстроя Ссср | Apparatus for generating steam and introducing into soil |
| EP0548765A2 (en) * | 1991-12-20 | 1993-06-30 | Hughes Aircraft Company | System for soil decontamination using recoverable extraction and injection probes |
| CN107366284A (en) * | 2017-07-13 | 2017-11-21 | 中冶集团武汉勘察研究院有限公司 | Reduce the collapsible loess compacting pile construction device and construction method for falling soil thickness after rise |
| CN208884504U (en) * | 2018-09-14 | 2019-05-21 | 李炬辉 | A kind of prewetting method for ground treatment structure of collapsible loess |
| CN111519601A (en) * | 2020-05-18 | 2020-08-11 | 兰州交通大学 | Method for humidifying soil body by using water vapor |
| CN112281805A (en) * | 2020-11-24 | 2021-01-29 | 中铁三局集团建筑安装工程有限公司 | Deep collapsible loess comprehensive treatment structure and construction method |
| CN213538941U (en) * | 2020-11-04 | 2021-06-25 | 中信国安建工集团有限公司 | A improvement device for collapsible loess road bed construction |
| CN113931164A (en) * | 2021-11-01 | 2022-01-14 | 西宁碧胜房地产开发有限公司 | Club-footed pile construction method for pre-soaking and compacting collapsible loess |
-
2022
- 2022-07-06 CN CN202210788805.1A patent/CN114991117A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1506023A1 (en) * | 1988-01-21 | 1989-09-07 | Запорожское Отделение Научно-Исследовательского Института Строительных Конструкций Госстроя Ссср | Apparatus for generating steam and introducing into soil |
| EP0548765A2 (en) * | 1991-12-20 | 1993-06-30 | Hughes Aircraft Company | System for soil decontamination using recoverable extraction and injection probes |
| CN107366284A (en) * | 2017-07-13 | 2017-11-21 | 中冶集团武汉勘察研究院有限公司 | Reduce the collapsible loess compacting pile construction device and construction method for falling soil thickness after rise |
| CN208884504U (en) * | 2018-09-14 | 2019-05-21 | 李炬辉 | A kind of prewetting method for ground treatment structure of collapsible loess |
| CN111519601A (en) * | 2020-05-18 | 2020-08-11 | 兰州交通大学 | Method for humidifying soil body by using water vapor |
| CN213538941U (en) * | 2020-11-04 | 2021-06-25 | 中信国安建工集团有限公司 | A improvement device for collapsible loess road bed construction |
| CN112281805A (en) * | 2020-11-24 | 2021-01-29 | 中铁三局集团建筑安装工程有限公司 | Deep collapsible loess comprehensive treatment structure and construction method |
| CN113931164A (en) * | 2021-11-01 | 2022-01-14 | 西宁碧胜房地产开发有限公司 | Club-footed pile construction method for pre-soaking and compacting collapsible loess |
Non-Patent Citations (1)
| Title |
|---|
| 李仁杰;王旭;张延杰;李建东;李泽源;任军楠;: "增湿重塑非饱和黄土时水-热运移规律研究", 水利水运工程学报, no. 03, 30 June 2020 (2020-06-30), pages 99 - 105 * |
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