CN111896462A - Pressure-adjustable portable testing device and method for evaluating anti-erosion and anti-subsidence capacity of urban soil - Google Patents
Pressure-adjustable portable testing device and method for evaluating anti-erosion and anti-subsidence capacity of urban soil Download PDFInfo
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- CN111896462A CN111896462A CN202010719916.8A CN202010719916A CN111896462A CN 111896462 A CN111896462 A CN 111896462A CN 202010719916 A CN202010719916 A CN 202010719916A CN 111896462 A CN111896462 A CN 111896462A
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Abstract
The application relates to the technical field of geotechnical engineering, and provides a portable pressure-adjustable testing device and a portable pressure-adjustable testing method for evaluating the anti-erosion and subsidence capacity of an urban soil body. When the device is used, the water tank is filled with water, and the water supply system is connected with the test system through the water supply hose for trial spraying; after the device is debugged, putting the cutting ring of the undisturbed soil sample into a test system, respectively recording the eroded depths of the soil sample under different injection times for the same soil body, and drawing a curve of the eroded depths of the soil sample along with the change of the injection time; by adjusting the initial erosion depth h1And analyzing with a gentle coefficient C, and primarily judging whether the site is easy to cause ground subsidence damage caused by water and soil loss. The scheme that this application provided, its beneficial effect lies in: the portable underground pipeline anti-erosion device is convenient to carry, strong in operability, intuitive in result and low in cost, can directly sample in a project site and quickly compare the water erosion resistance of different soil bodies, and provides guidance for site selection and construction of urban underground pipeline projects.
Description
Technical Field
The utility model relates to a geotechnical engineering technical field especially relates to a portable testing arrangement of adjustable pressure for evaluating city soil body anti erosion land subsidence ability, and the means of accessible field test predicts the possibility that the pipeline seepage caused soil body erosion land subsidence in each region of city, prevents to suffer from in the past.
Background
In recent years, road collapse accidents in various major cities of China frequently occur, which not only causes traffic interruption, but also is accompanied by damages to various communication, electric power and other infrastructures, and seriously affects production life and property safety of people. The ground collapse accident is mainly ground collapse, and the pipeline damage and leakage are found to be the main reasons for generating the road collapse by counting the domestic road collapse cases. The fluid inside urban underground pipelines generally has certain pressure, and the damage of the pipelines causes fluid leakage, causes erosion of surrounding soil bodies, causes water and soil loss, generates cavities underground and finally causes collapse. Therefore, before underground pipelines are constructed, it is important to fully observe the erosion resistance of the soil around the pipelines against the seepage water flow.
However, at present, the test of the erosion resistance of the soil body can be almost only carried out in an indoor test, and cannot be carried out on an engineering field, and the test equipment and the research method which are used are complex, so that the guidance cannot be conveniently provided for the actual engineering. The device can well make up the defects, is convenient to carry, can be used for taking undisturbed soil on site in an engineering field for testing, is suitable for various soil bodies, can adjust the water pressure and flow of erosion water flow, has clear structure, strong operability, visual result and low cost, can quickly compare the water flow erosion resistance of different soil bodies, can provide better guidance for site selection and construction of urban underground pipeline engineering, and effectively prevents urban subsidence.
Disclosure of Invention
The purpose of this application lies in: the device simulates the leakage water flow when a pipeline is damaged by generating the jet water flow, simulates the process of corroding the surrounding soil body by using the jet water flow to erode the soil sample, and reflects the erosion resistance of different soil bodies by measuring the eroded depth of the soil sample.
In order to achieve the above object, the present application provides the following technical solutions:
the portable pressure-adjustable testing device for evaluating the anti-erosion and anti-subsidence capacity of the urban soil comprises a water supply system and a test system, wherein the water supply system is connected with the test system through a water supply hose;
the water supply system is used for providing pressurized water and comprises a water tank, a water inlet, a water tank cover, a water outlet, a submersible pump, a connecting wire, a connecting pipe, a pump water outlet pressure adjusting device, a pressure gauge, a telescopic handle, a power wire, a power switch and side wheels;
furthermore, the water tank is a main body of the water supply system and is used for containing water simulating seepage water flow; the water inlet is positioned at the top of the water tank and used for filling water, and a water tank cover is arranged above the water inlet; the water outlet is positioned on the side wall of the water tank and used for supplying water to the test system; the submersible pump is fixed at the bottom of the inner cavity of the water tank and used for generating pressurized water, one end of the submersible pump is connected with the pump water outlet pressure adjusting device through a connecting wire, and the other end of the submersible pump is connected with the inner side of the water outlet through a connecting pipe; the pump water outlet pressure adjusting device is arranged on the front surface of the water tank, and is provided with a knob, so that the water outlet pressure of the submersible pump can be flexibly adjusted according to the water pressure in the actual pipeline; the pressure gauge is connected with the outer side of the water outlet and can indicate the water pressure at the outlet of the water tank; the telescopic handle is positioned on the back of the outer side of the water tank and can be extended or shortened, so that the water tank is convenient to move; the power cord enters the inner cavity through the opening on the back of the water tank and is connected with the submersible pump and used for supplying power to the submersible pump; the power switch is positioned on a power line outside the water tank and used for controlling the submersible pump to be switched on and off; the side wheels are arranged at the bottom of the outer side surface of the water tank, so that the transportation of the whole water supply system is facilitated;
the testing system consists of a top cover, a water supply port, a valve, a high-pressure spray head, a rubber ring, a side wall, a flange plate, a bolt, a side door, a pin bolt, a magnet buckle, a water filtering net, a ring cutter groove, a ring cutter, a water outlet and a base;
furthermore, a flange plate is arranged at the bottom of the top cover, a water supply port is reserved in the center, a valve is arranged on the upper side of the water supply port, the upper side of the valve is connected with a pressure gauge outside a water outlet of a water supply system through a water supply hose, and the valve is used for controlling the water supply system to supply water flow to the test system to be opened and closed; the high-pressure spray head is used for spraying leakage water flow to a test soil sample, the leakage water flow with different diameters can be simulated by replacing spray heads with different water outlet apertures, the upper part of the high-pressure spray head is screwed into the lower side of the water supply port through threaded connection, and a rubber ring is additionally arranged between the high-pressure spray head and the water supply port to prevent water leakage; the top of the side wall is provided with a flange plate which is positioned between the top cover and the base, the side wall is connected with the top cover through the flange plate and a plurality of bolts, and the side wall is fixedly connected with the base; the side door is positioned at the middle lower part of the side wall, the joint of the side door and the side wall is hinged by a pin bolt, and a magnet buckle is arranged at the opening of the side door and is used for being fixed with the side wall after being closed; the water filter screen is arranged at the middle lower part of the inner cavity of the side wall and is used for facilitating the smooth outflow of sputtered water flow, the center of the water filter screen is provided with a cutting ring groove, and the inner diameter of the cutting ring groove is slightly larger than the outer diameter of the cutting ring; the cutting ring is arranged in a cutting ring groove on the water filter screen, and can be directly used for collecting soil samples; the water outlet is positioned at the bottom of the side wall, so that the inner cavity of the side wall is communicated with the outside and used for guiding out test wastewater; the base is positioned below the side wall and is fixedly connected with the side wall.
Compared with the prior art, the technical scheme provided by the application is taken as an example and is not limited, and has the following beneficial effects: the device that this application provided has convenient to carry, the structure is clear, the strong operability, the result is directly perceived, low cost's advantage, can get the original state soil test at the engineering place scene, is applicable to sand type soil and cohesive soil, can adjust the water pressure that erodees rivers, can swiftly compare out the strong and weak of anti rivers erosion capacity of different soil bodies, can provide better guidance to the site selection and the construction of city underground pipeline engineering.
Drawings
Fig. 1 is a schematic front view of a water supply system in a testing apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic side view of a water supply system in the testing apparatus according to an embodiment of the present disclosure;
FIG. 3 is a schematic top view of a water supply system in the testing apparatus according to an embodiment of the present disclosure;
FIG. 4 is a schematic side view of a testing system in a testing apparatus according to an embodiment of the present disclosure;
FIG. 5 is a schematic top view of a testing system in a testing apparatus according to an embodiment of the present disclosure;
fig. 6 is a schematic view of a detailed structure of a side door of a testing system in an open state in a testing apparatus provided in an embodiment of the present application.
Description of reference numerals:
1 is a water supply system, 2 is a test system, and 3 is a water supply hose;
11 is a water tank, 12 is a water inlet, 13 is a water tank cover, 14 is a water outlet, 15 is a submersible pump, 16 is a connecting wire, 17 is a connecting pipe, 18 is a pump-out water pressure adjusting device, 19 is a pressure gauge, 110 is a telescopic handle, 111 is a power line, 112 is a power switch, and 113 is a side wheel;
21 is a top cover, 22 is a water supply port, 23 is a valve, 24 is a high-pressure spray head, 25 is a rubber ring, 26 is a side wall, 27 is a flange plate, 28 is a bolt, 29 is a side door, 210 is a pin bolt, 211 is a magnet buckle, 212 is a water strainer, 213 is a ring cutter groove, 214 is a ring cutter, 215 is a water outlet and 216 is a base.
Detailed Description
The technical solutions provided in the present application will be further described with reference to the following specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present application have a better implementation and are not intended to limit the present application in any way. The technical features or combinations of technical features described in the embodiments of the present application should not be considered as being isolated, and they may be combined with each other to achieve a better technical effect. The scope of the preferred embodiments of this application may also include additional implementations, and this should be understood by those skilled in the art to which the embodiments of this application pertain.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The drawings in the present application are in simplified form and are not to scale, but rather are provided for convenience and clarity in describing the embodiments of the present application and are not intended to limit the scope of the application. Any modification of the structure, change of the ratio or adjustment of the size of the structure should fall within the scope of the technical disclosure of the present application without affecting the effect and the purpose of the present application. And the same reference numbers appearing in the various drawings of the present application designate the same features or components, which may be employed in different embodiments.
The portable pressure-adjustable testing device for evaluating the anti-erosion and anti-subsidence capacity of the urban soil comprises a water supply system 1 and a test system 2, wherein the water supply system 1 is connected with the test system 2 through a water supply hose 3;
the water supply system 1 comprises: the water pump comprises a water tank 11, a water inlet 12, a water tank cover 13, a water outlet 14, a submersible pump 15, a connecting line 16, a connecting pipe 17, a pump water pressure adjusting device 18, a pressure gauge 19, a telescopic handle 110, a power line 111, a power switch 112 and a side wheel 113;
further, the water tank 11 has a volume of 50L, is made of hard plastic, is a main body of the water supply system, and is used for containing water simulating leakage water flow; the water inlet 12 is positioned at the top of the water tank 11, the caliber of the water inlet is 80mm, the water inlet is used for filling water, and a water tank cover 13 is arranged above the water inlet 12; the water outlet 14 is positioned on the side wall of the water tank 11, has the caliber of 15mm and is used for supplying water to a test system; the submersible pump 15 is fixed at the bottom of the inner cavity of the water tank 11 and used for generating pressurized water, one end of the submersible pump 15 is connected with the pump-out water pressure adjusting device 18 through a connecting wire 16, and the other end of the submersible pump 15 is connected with the inner side of the water outlet 14 through a connecting pipe 17; the pump water outlet pressure adjusting device 18 is arranged on the front surface of the water tank 11, a knob is arranged on the pump water outlet pressure adjusting device, the outlet water pressure of the submersible pump 15 can be flexibly adjusted, and the pressure adjusting range is 0.05-0.50MPa, so that the leakage conditions of pipelines with different pressures are simulated; the pressure gauge 19 is connected with the outer side of the water outlet 14, the measuring range of the pressure gauge 19 is 0-0.60 MPa, and the pressure gauge can indicate the water pressure at the outlet of the water tank 11; the telescopic handle 110 is positioned on the back of the outer side of the water tank 11 and can be extended or shortened, so that the water tank 11 is convenient to move; the power cord 111 enters the inner cavity through the opening on the back of the water tank 11 to be connected with the submersible pump 15 and is used for supplying power to the submersible pump 15; the power switch 112 is positioned on a power line 111 outside the water tank 11 and is used for controlling the switching on and off of the submersible pump 15; the side wheels 113 are arranged at the bottom of the outer side surface of the water tank 11, and the number of the side wheels is two, so that the transportation of the whole water supply system is facilitated;
the test system 2 comprises: the water supply device comprises a top cover 21, a water supply port 22, a valve 23, a high-pressure spray head 24, a rubber ring 25, a side wall 26, a flange 27, a bolt 28, a side door 29, a pin bolt 210, a magnet buckle 211, a water filter screen 212, a cutting ring groove 213, a cutting ring 214, a water outlet 215 and a base 216;
further, the top cover 21 is made of organic glass, the diameter of the top cover is 18cm, a flange 27 with the diameter of 25cm is arranged at the bottom of the top cover, a water supply port 22 is reserved in the center of the top cover, a valve 23 is arranged on the upper side of the water supply port 22, the upper side of the valve 23 is connected with a pressure gauge 19 on the outer side of a water outlet 14 of the water supply system 1 through a water supply hose 3, and the valve 23 is used for controlling the water supply system 1 to open and; the high-pressure spray head 24 is made of stainless steel and used for spraying leakage water flow to a test soil sample, the leakage water flow with different diameters can be simulated by replacing spray heads with 3mm, 5mm and 7mm calibers, the upper part of the high-pressure spray head 24 is screwed into the lower side of the water supply port 22 through threads, and a rubber ring 25 is additionally arranged between the high-pressure spray head 24 and the water supply port 22 to prevent water leakage; the side wall 26 is made of organic glass, and has an inner diameter of 19.2cm and an outer diameterThe height of the side wall 26 is 45cm, the flange 27 of 25cm is arranged at the top of the side wall 26, the side wall 26 is positioned between the top cover 21 and the base 216, the side wall 26 is connected with the top cover 21 through the flange 27 and four bolts 28, and the side wall 26 is fixedly connected with the base 216; the side door 29 is made of organic glass, is 10cm high and is positioned at the middle lower part of the side wall 26, the joint of the side door 29 and the side wall 26 is hinged by a pin bolt 210, and a magnet buckle 211 is arranged at the opening of the side door 29 and is used for being fixed with the side wall 26 after being closed; the water filter screen 212 is made of plastics, is arranged at the middle lower part of the inner cavity of the side wall 26, is 10cm away from the base, has the diameter of 19.2cm, and is used for facilitating the smooth outflow of sputtered water flow, the center of the water filter screen 212 is provided with a circular cutter groove 213, and the inner diameter of the circular cutter groove 213 is 10.5 cm; the cutting ring 214 is arranged in the cutting ring groove 213 on the water filter screen 212, the height of the cutting ring 214 is 5cm, the inner diameter is 10cm, and the volume is 628cm3The device can be directly used for collecting soil samples; the water outlet 215 is positioned at the bottom of the side wall 26, the caliber of the water outlet is 30mm, so that the inner cavity of the side wall 26 is communicated with the outside and used for leading out test wastewater; the base 216 is made of organic glass, has a diameter of 25cm, is located below the side wall 26, and is fixedly connected with the side wall 26.
The application provides a portable testing arrangement of adjustable pressure for evaluating urban soil body anti erosion land falls into ability, its working method as follows:
before the device is used, firstly test spraying is carried out: filling water into the water tank 11 through the water inlet 12, and screwing the water tank cover 13; connecting the water supply system 1 and the test system 2 by a water supply pipe 3, keeping the power switch 112 in a closed state, and connecting the power line 111 with an external power supply; estimating the test water flow pressure required by the test, and setting an initial value on the pump-out water pressure adjusting device 18; installing a high-pressure spray head 24 and a rubber ring 25 with required calibers at the lower side of a water supply port 22 of the test system 2, and connecting a top cover 21 with a side wall 26 through a flange 27 and four bolts 28; the valve 23 is set to be in an opening state, and the power switch 112 is turned on until the high-pressure nozzle 24 has water flowing out and the water supply hose 14 is full of water; closing the valve 23, checking whether the whole device leaks water, finely adjusting the pump water pressure adjusting device 18 until the pressure gauge 19 reaches the estimated test water flow pressure; then the valve 23 is opened, and whether the water spraying of the high-pressure spray head 24 is normal is checked; after the pilot injection is finished, the power switch 112 and the valve 23 are closed;
and then carrying out formal tests: opening the magnet buckle 211, opening the side door 29, taking out the cutting ring 214 and taking out soil; after soil taking is completed, the annular knife 214 is placed into the annular knife groove 213, the side door 29 is closed, and the magnet buckle 211 is buckled; placing the test system at a place with flat terrain, and turning on a power switch 112; opening the valve 23, and closing the valve 23 quickly after 5s of injection; opening the side door 29, taking out the cutting ring 214, measuring the erosion depth of the soil sample by using a vernier caliper or a tire pattern depth gauge, and recording data; sampling again, repeating the test steps twice, averaging the data obtained by the three tests to obtain the erosion depth h when the spray is sprayed for 5s1(ii) a Changing the spraying time to 10s, 15s and 25s, repeating the operation, and respectively recording the depth h of the eroded sprayed soil sample2，h3And h4And drawing a curve of the soil sample erosion depth changing along with the spray time.
And (3) evaluating the erosion resistance of the soil body according to the following method by combining a test curve:
first, the depth of erosion h at which 5s of erosion occurred1The method can be called as 'initial erosion depth', the characteristics of the soil body under the initial erosion action are represented, and when the index exceeds 1cm, the soil body is weak in erosion resistance and easy to damage under the action of leakage water flow; on the contrary, the anti-erosion capability is stronger;
further, when the initial erosion depths are not greatly different, the gentle coefficient C is set to (h)1h4)/(h2h3) The stability of different soil bodies in the erosion process is compared; when the C is closer to 1, the erosion depth curve of the soil body is more gentle, the soil body is more stable under the action of water flow, and the erosion resistance is stronger; when the deviation between C and 1 is larger, the steeper the erosion depth curve of the soil body is, the soil body is more easy to generate progressive erosion damage under the action of water flow; tests show that when | C-1| is less than or equal to 0.4, the soil body can be considered to have stronger anti-erosion capability;
in conclusion, when evaluating the erosion resistance of the soil body, firstly, the investigation h is carried out1When h is present1When the conditions are met, whether the C meets the requirements is inspected, if both indexes meet the requirements, the resistance of the soil body of the site is judgedThe corrosion resistance is strong, and the method is suitable for laying underground structures such as pipelines and the like near soil bodies; if the index does not meet the requirement, the area is considered to be bypassed, or corresponding reinforcement measures are taken for the pipeline, and the monitoring is strengthened.
The above description is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present application.
Claims (4)
1. A portable testing arrangement of adjustable pressure for evaluating urban soil body anti erosion land falls into ability, its characterized in that: the device comprises a water supply system (1) and a test system (2), wherein the water supply system (1) is connected with the test system (2) through a water supply hose (3).
2. The portable, pressure-adjustable testing apparatus for evaluating the erosion resistance of urban soil according to claim 1, characterized in that: the water supply system (1) comprises a water tank (11), a water inlet (12), a water tank cover (13), a water outlet (14), a submersible pump (15), a connecting line (16), a connecting pipe (17), a pump water pressure adjusting device (18), a pressure gauge (19), a telescopic handle (110), a power line (111), a power switch (112) and side wheels (113);
the water inlet (12) is positioned at the top of the water tank (11) and a water tank cover (13) is arranged above the water tank; the water outlet (14) is positioned on the side wall of the water tank (11); the submersible pump (15) is fixed at the bottom of the inner cavity of the water tank (11), one end of the submersible pump (15) is connected with the pump water outlet pressure adjusting device (18) through a connecting wire (16), and the other end of the submersible pump (15) is connected with the inner side of the water outlet (14) through a connecting pipe (17); the pump water outlet pressure adjusting device (18) is arranged on the front surface of the water tank (11); the pressure gauge (19) is connected with the outer side of the water outlet (14); the telescopic handle (110) is positioned on the back of the outer side of the water tank (11); the power cord (111) enters the inner cavity through the opening on the back of the water tank (11) and is connected with the submersible pump (15); the power switch (112) is positioned on a power line (111) outside the water tank (11); the side wheels (113) are arranged at the bottom of the outer side surface of the water tank (11).
3. The portable, pressure-adjustable testing apparatus for evaluating the erosion resistance of urban soil according to claim 1, characterized in that: the testing system (2) comprises a top cover (21), a water supply port (22), a valve (23), a high-pressure spray head (24), a rubber ring (25), a side wall (26), a flange plate (27), a bolt (28), a side door (29), a pin bolt (210), a magnet buckle (211), a water filter screen (212), a cutting ring groove (213), a cutting ring (214), a water outlet (215) and a base (216);
a flange plate (27) is arranged at the bottom of the top cover (21), a water supply port (22) is reserved in the center, a valve (23) is arranged on the upper side of the water supply port (22), the upper side of the valve (23) is connected with a pressure gauge (19) on the outer side of a water outlet (14) of the water supply system (1) through a water supply hose (3), and a high-pressure spray head (24) is arranged on the lower side of the water supply port (22); the high-pressure spray head (24) can replace different calibers to meet the test requirements, the upper part is screwed into the lower side of the water supply port (22) through a thread, and a rubber ring (25) is additionally arranged between the high-pressure spray head (24) and the water supply port (22) to prevent water leakage; the top of the side wall (26) is provided with a flange plate (27), the side wall (26) is positioned between the top cover (21) and the base (216), the side wall (26) is connected with the top cover (21) through the flange plate (27) and a plurality of bolts (28), and the side wall (26) is connected with the base (216) in a fixed mode; the side door (29) is positioned at the lower part of the side wall (26), the joint of the side door and the side wall is hinged by a pin bolt (210), and a magnet buckle (211) is arranged at the opening of the side door (29); the water filter screen (212) is arranged at the middle lower part of the inner cavity of the side wall (26), and a circular cutter groove (213) is arranged in the center of the water filter screen (212); the cutting ring (214) is arranged in a cutting ring groove (213) on the water filtering net (212); the drainage opening (215) is positioned at the bottom of the side wall (26); the base (216) is positioned below the side wall (26) and is fixedly connected with the side wall (26).
4. A portable pressure adjustable test device for evaluating the erosion resistance of urban soil bodies by using the pressure adjustable portable test device of claim 1, wherein: evaluating the erosion resistance of the soil body according to the following method;
first, the depth of erosion h at which 5s of erosion occurred1The soil erosion resistance index can be called as 'initial erosion depth', the characteristics of the soil body under the initial erosion action are represented, when the index exceeds 1cm, the soil body is weak in erosion resistance, and is easy to be affected by seepage water flowDestruction occurs; on the contrary, the anti-erosion capability is stronger;
further, when the initial erosion depths are not greatly different, the gentle coefficient C is set to (h)1h4)/(h2h3) The stability of different soil bodies in the erosion process is compared; when the C is closer to 1, the erosion depth curve of the soil body is more gentle, the soil body is more stable under the action of water flow, and the erosion resistance is stronger; when the deviation between C and 1 is larger, the steeper the erosion depth curve of the soil body is, the soil body is more easy to generate progressive erosion damage under the action of water flow; the test shows that when | C-1| is less than or equal to 0.4, the soil body can be considered to have stronger anti-erosion capability.
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| US20100082259A1 (en) * | 2008-09-24 | 2010-04-01 | Brian Lee Prigge | Percolation test apparatus |
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