CN212514572U - High steep slope stress deformation characteristic centrifuge model test system under rainfall condition - Google Patents
High steep slope stress deformation characteristic centrifuge model test system under rainfall condition Download PDFInfo
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Abstract
The utility model discloses a high and steep slope stress deformation characteristic centrifuge model test system under rainfall condition, which comprises a centrifugal layered seepage model box, a rainfall simulation control system, a slope moisture content monitoring system, a slope stress deformation monitoring system and a high-speed camera system; a high and steep slope model is arranged in the centrifugal layered seepage model box, the rainfall simulation control system is arranged at the upper end of the centrifugal layered seepage model box and faces downwards to the high and steep slope model, the detection sensors of the slope water content monitoring system and the slope stress deformation monitoring system are arranged in the high and steep slope model, and the high-speed camera system is arranged in the centrifugal layered seepage model box and faces towards the high and steep slope model. The utility model discloses the commonality of test system is strong, can extensively be applicable to the side slope model of all kinds of operating modes; the slope models with various slopes, excavation forms and reinforcement forms can be tested.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering, concretely relates to high steep slope atress deformation characteristic centrifuge model test system under rainfall condition.
Background
The railway engineering in southeast Tibetan runs in high-altitude and cold areas, the areas are broken, extremely complex in structure, high in seismic intensity and frequent in occurrence, quite complex in landform and topography, extremely poor in geological conditions, such as landslides, collapse, debris flow, karst, earthquakes and other geological disasters, the occurrence frequency of the geological disasters in the areas is extremely high, tunnel portals along the line are located on high-steep side slopes, the height of the side slopes above the portals can reach 800m, and the side slopes are broken in rock masses, strong in weathering and poor in stability. This presents a serious challenge to the smooth construction and safe operation of certain railway projects in southeast of tibetan.
The existing main factors inducing high and steep slope geological disasters comprise earthquakes, construction excavation, precipitation infiltration and the like. The landslide disaster induced by rainfall infiltration accounts for a large proportion of the landslide disaster. The research on the rainfall effect and the change of the slope surface seepage and the water field inside the slope body has positive significance for determining the slope instability critical condition. The high and steep slope of domestic researchers generally refers to a natural slope with a height of more than 50m, and the engineering cases of the high and steep slope with a height of more than 500m encountered in certain railway engineering in southeast Tibetan are few. Particularly, a certain railway engineering line in southeast Tibetan is in a high-altitude area, and the method is not suitable for the damage form of the high and steep slope, stability evaluation, engineering protection measures and the like in China at present. The geotechnical centrifugal model test can simulate the real stress field condition of a slope body, but the existing indoor side slope rainfall test system is mostly a test device in a normal gravity environment, the prototype stress field of the slope body cannot be really restored, and the similar condition of the model test cannot be met. The existing centrifugal test system is only suitable for the test requirement that the precipitation factor is not considered for a common slope, and can not meet the test requirement of the stress deformation characteristic of a high and steep slope under the condition of rainfall development. Therefore, a centrifuge model test system suitable for the stress-deformation characteristic of the high and steep slope under the rainfall condition is urgently needed to develop the research on the stress-deformation instability mechanism of the high and steep slope under the rainfall action.
At present, the centrifugal machine model test system for the stress deformation characteristic of the high and steep slope under the rainfall conditions at home and abroad has the following defects:
1) most rainfall model tests are simulated under normal gravity conditions, and the real stress field of a prototype slope body cannot be restored;
2) the rainfall condition simulation in the centrifugal machine is difficult, other similar seepage conditions are used for replacing the simulation, and the authenticity of the rainfall seepage of the reduction slope is lost;
3) the existing few centrifuge rainfall systems cannot accurately control rainfall intensity and duration, and accurately restore the prototype slope rainfall conditions;
4) the existing model test equipment cannot be used for simulating the rainfall infiltration boundary condition of a high and steep slope, and larger seepage boundary interference is easy to generate to influence the authenticity of experimental simulation;
5) the method has the advantages that systematic research is lacked for runoff and slope infiltration processes of the slope of the high and steep slope under rainfall conditions, the stress and deformation mechanism of the slope body caused by changes of the internal seepage field of the high and steep slope are not clear, and the deformation instability criterion of the slope body cannot be determined;
6) the existing experiment monitoring rainfall slope internal parameters are mostly records of simple parameters such as water content and the like, and systematic monitoring and recording of a water field and a stress field in the slope and apparent deformation outside the slope cannot be obtained;
7) the existing centrifugal model test system has rough image recording and is lack of an image recording system capable of quantifying the whole process of the crack development of the slope surface and the deformation and damage process of the slope body.
Disclosure of Invention
The purpose of this patent is to provide a high steep slope atress deformation characteristic centrifuge model test system under the rainfall condition, solves not enough among the prior art.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a centrifugal machine model test system for the stress deformation characteristic of a high and steep slope under the rainfall condition is characterized by comprising a centrifugal layered seepage model box, a rainfall simulation control system, a slope water content monitoring system, a slope stress deformation monitoring system and a high-speed camera system; the high-gradient seepage simulation system is characterized in that a high-gradient slope model is arranged in the centrifugal layered seepage model box, the rainfall simulation control system is arranged at the upper end of the centrifugal layered seepage model box and faces downwards to the high-gradient slope model, the detection sensors of the slope water content monitoring system and the slope stress deformation monitoring system are arranged in the high-gradient slope model, and the high-speed camera system is arranged in the centrifugal layered seepage model box and faces towards the high-gradient slope model.
Further, the rainfall simulation control system comprises a water storage tank, a water storage tank water level transmitter, a high-pressure micro water pump, an electromagnetic valve, a micro flow meter, a high-pressure atomization rainfall sprayer, a sprayer fixing support and a DC speed regulator; the high-pressure atomization rainfall spray heads are provided with a plurality of groups and are arranged on the spray head fixing bracket; the multiple groups of high-pressure atomized rainfall nozzles face downwards to the test slope body.
Further, the centrifugal layered seepage model box comprises an aluminum model box, an organic glass side wall and a box body upper cover, wherein a layered water-proof bottom plate and a porous toe support are arranged inside the aluminum model box; the porous slope toe support is arranged at the slope toe of the high and steep slope model, the layered water-resisting bottom plate is provided with seepage holes, and the layered water-resisting bottom plate separates the bottom of the centrifugal layered seepage model box to form a water-resisting bottom plate lower space.
Furthermore, the slope water content monitoring system mainly comprises a plurality of groups of EC-5 water content sensors and soil matrix suction sensors which are embedded in the high and steep slope model, a water-stop plate lower water level sensor arranged in the space below the water-stop bottom plate, a multi-channel data acquisition instrument and a computer.
Furthermore, the slope stress deformation monitoring system mainly comprises a plurality of groups of soil pressure sensors embedded in the high and steep slope model, fiber gratings and three non-contact infrared displacement sensors arranged on the slope surface of the high and steep slope model.
Furthermore, the high-speed camera system comprises a camera fixing support and a high-speed camera, wherein the camera fixing support is arranged inside the centrifugal layered seepage model box, and the high-speed camera is over against the slope surface of the high and steep slope model.
Furthermore, a filtering sponge is arranged inside the porous toe support.
Furthermore, the layered water-stop bottom plate is made of aluminum and is supported at the bottom of the centrifugal layered seepage model box through a plurality of rectangular support legs.
Further, the seepage holes are arranged on one side, close to the toe, of the layered water-stop bottom plate, and the number of the seepage holes is 16.
Furthermore, the high-pressure atomization rainfall spray heads are provided with groups which are arranged on the spray head fixing support in three rows.
Compared with the prior art, the beneficial effects of the utility model are as follows:
(1) the utility model discloses test system's commonality is strong, can extensively be applicable to the side slope model of all kinds of operating modes. The slope models with various slopes, excavation forms and reinforcement forms can be tested.
(2) The utility model discloses a hierarchical rainfall simulation feedback system mainly comprises water storage tank, miniature high pressure water pump, solenoid valve, miniature flowmeter, high-pressure atomizing rainfall shower nozzle, shower nozzle bracket and relevant supply channel. The rainfall intensity and duration can be accurately regulated and controlled in real time in the centrifugal loading process.
(3) The rainfall spray head bracket consists of a stainless steel lead screw, a rubber support, a positive and negative screw nut and a fixing clamp. The whole support is stretched and contracted by locking the positive and negative screw nuts, and is supported and fixed between two side walls of the model box. The fixing mode is simple, firm and reliable, and the position can be flexibly adjusted. The sliding nozzle fixing clamp is arranged on the screw rod, and the position of the nozzle can be freely adjusted.
(4) The utility model discloses a slope moisture content monitoring system is mainly including burying underground in the inside a plurality of moisture content sensors of side slope model, the bottom of the case high accuracy level sensor, static data acquisition appearance and the computer that supplies real-time supervision record data to and the data line that all above-mentioned sensors are connected with the data acquisition appearance and the various signal amplifier supporting with it. The real-time response condition of the moisture field in the slope body under different rainfall working conditions can be monitored, and the water-soil characteristic curve relation between the water content of the slope body of the high and steep slope and the suction force of the matrix can be obtained. The cooperation water-stop sheet bottom level sensor can quantify the domatic infiltration volume in the rainfall process and domatic runoff volume size, study the evolution route of moisture at high steep side slope surface and inside.
(5) The utility model discloses a slope body atress warp monitoring system carries out real-time supervision through burying underground in inside array soil pressure sensor 26 of high steep side slope model, fiber grating 27 and settling in domatic three non-contact infrared displacement sensor 19 to the inside atress and the inside and outside deformation of high steep side slope model under the rainfall condition, can effectively monitor and take notes the overall process of the evolution of high steep side slope atress deformation unstability.
(6) The utility model discloses a layering water proof bottom plate lower part has 50mm high space, and the bottom plate is close to toe one side and is equipped with the several seepage hole. The toe is provided with a perforated toe bracket, and the filtering sponge is filled in the toe bracket to play a role in absorbing and filtering accumulated moisture of the toe. The components act together to store the excessive moisture flowing down from the slope surface, reduce the moisture gathering at the slope toe, eliminate the influence on the test due to the infiltration of the slope toe and effectively restore the working condition of the rainfall infiltration boundary of the high and steep slope.
(7) The utility model discloses a high-speed camera system comprises the positive high-speed camera and the fixed bolster that are located high steep side slope model. The high-speed camera can effectively record the rainwater infiltration and slope scouring conditions of the whole slope, capture the development, extension and penetration conditions of crack seams on the slope surface, monitor the instability evolution process of the slope body of the high and steep slope and provide a basis for determining the instability mode of the slope body under the rainfall infiltration condition.
(8) The utility model discloses the design is unique, and the novelty is strong, and is rational in infrastructure, and the function is perfect. The system has high automation integrity and higher informatization level, and can transform the existing centrifugal machine equipment for testing with less cost. The system has strong universality, and the model manufacture has complete process flow for reference, and can be applied to the research of the stress deformation characteristic of the high and steep slope under the rainfall condition. The utility model discloses the standard and the technical merit of centrifugal model test system technique have been improved to a certain extent.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a front view of the system of the present invention;
FIG. 3 is a structural layout view of a layered water-proof bottom plate at the bottom of a model box;
FIG. 4 is a diagram of a support bar stand and a sprinkler head of a rainfall system;
in the figure, 1-a water storage tank, 2-a high-pressure micro water pump, 3-an electromagnetic valve, 4-a micro flow meter, 5-a high-pressure atomization rainfall spray nozzle, 6-a spray nozzle fixing support, 7-a DC speed regulator, 8-a water storage tank water level transmitter, 9-an aluminum model box, 10-an organic glass side wall, 11-a box body upper cover, 12-a layered water-proof bottom plate, 13-a porous toe support and 14-a filtering sponge; 15-seepage holes, 16-space below a waterproof bottom plate, 17-EC-5 water content sensors, 18-soil matrix suction sensors, 19-infrared displacement sensors, 20-multichannel data acquisition instruments, 21-computers, 22-camera fixing supports and 23-high-speed cameras; 24-high steep slope model; 25-water level sensor under water-stop sheet, 26-soil pressure sensor, 27-optical fiber grating, 28-photoelectric signal converter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying examples, and it is obvious that the described examples are only some of the examples of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model aims at providing a high steep slope atress deformation characteristic centrifuge model test system under rainfall condition to solve the problem that above-mentioned prior art exists. The utility model discloses rely on similar theory, the rainfall component design is unique, and structural arrangement is reasonable, and the function is perfect. The centrifugal machine model test for the stress-deformation characteristic of the high and steep slope under the rainfall condition can be carried out, can be applied to determining the critical condition of stress-deformation instability of the high and steep slope under the rainfall condition, and provides a technology and an idea for researching the stress-deformation characteristic of the high and steep slope under the rainfall condition.
In order to make the above objects, features, structures and novel points of the present invention comprehensible, the present invention is described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1-4, the utility model provides a centrifugal machine model test system for stress deformation characteristics of a high and steep slope under rainfall conditions, which comprises a centrifugal layered seepage model box, a rainfall simulation control system, a slope moisture content monitoring system, a slope stress deformation monitoring system and a high-speed camera system; a high and steep slope model 24 is arranged in the centrifugal layered seepage model box, the rainfall simulation control system is arranged at the upper end of the centrifugal layered seepage model box and faces downwards to the high and steep slope model 24, the detection sensors of the slope water content monitoring system and the slope stress deformation monitoring system are arranged in the high and steep slope model 24, and the high-speed camera system is arranged in the centrifugal layered seepage model box and faces to the high and steep slope model 24.
The centrifugal layered seepage model box comprises a model box body 9, an organic glass side wall 10, a box body upper cover 11, a layered waterproof bottom plate 12 and a porous toe support 13. The side surface of the model box body 9 is provided with an organic glass side wall 10. The side wall and the model box are fixed by bolts and sealed by rubber rings, so that the model is convenient to manufacture and clean after the test.
In a specific embodiment, the water-resisting bottom plate 12 is made of a whole piece of 15mm thick aluminum plate, the lower part of the water-resisting bottom plate is provided with 10 rectangular support legs of 50mm × 30mm × 200mm, the length × width × height of the whole water-resisting bottom plate is 800mm × 600m × 700m, and the clear height of the bottom plate water storage space 16 is 50mm to store excessive water flowing down from slope runoff, so that a large amount of water collection on the slope is reduced. A plurality of seepage holes 15 are arranged on one side of the bottom plate close to the toe. The sloping foot is also provided with a sloping foot bracket 13 with holes, and the length is multiplied by the width by the height by 600mm by 100 mm.
In a particular embodiment, the apertured toe support 13 at the toe is of aluminium, length x width x height 600mm x 100 mm. The holes are formed on the slope foot surface, so that moisture can enter conveniently. In order to prevent the soil body from being blocked, 80-mesh gauze needs to be covered. The back of the bracket is filled with a filter sponge 14 to filter moisture accumulated at the toe of the slope to prevent the seepage holes 15 of the water-resisting bottom plate from being blocked.
The rainfall simulation control system mainly comprises a water storage tank 1, a water storage tank water level transmitter 8, a high-pressure micro water pump 2, an electromagnetic valve 3, a micro flow meter 4, a high-pressure atomization rainfall spray head 5, a spray head fixing support 6, a DC speed regulator 7 and the like, and is shown in figure 2. The rainfall simulation control system can adjust the power of the water pump and the water delivery time according to the required rainfall intensity, and the requirements of simulating specific rainfall intensity and duration are met.
In a specific embodiment, the maximum power of the micro high-pressure water pump 2 is 180W, and the maximum working pressure is 1.5 MPa. The length, width and height of the micro high-pressure water pump 2 are 200mm, 100mm and 80mm, and the micro high-pressure water pump is fixed on the top of the upper cover 11 of the model box.
In a specific embodiment, the micro flow meter 4 is a turbine principle, is used for measuring micro flow, and has the characteristics of high precision and strong stability. The working pressure is 2MPa at most, the caliber is 1.5mm, the measuring range is 0.015-1.8L/min, and the precision is +/-2%.
In a specific embodiment, the main body of the high-pressure atomizing rainfall sprayer 5 and the ejector pin are made of stainless steel, the nozzle is a ceramic laser hole with the aperture of 0.3mm, and the spring pressure is moderate and can be suitable for a larger pressure range. The joint of the water supply pipeline related to the spray head is made of brass nickel plating, and is firm and durable, and the water supply pipeline uses hard PU pipes with the diameter of 9.5 mm.
The rainfall spray nozzle bracket 6 consists of a stainless steel lead screw, a rubber support and a spray nozzle fixing frame. The length of the support is adjusted within the range of 55-65cm by locking the screw nut for stretching. The bracket is propped against the side wall of the model box tightly after being unfolded, and the high-pressure atomization rainfall spray head 5 is firmly fixed. The fixing mode of the bracket system is simple, firm and reliable, and the bracket screw rod is provided with the slidable nozzle fixing clamp which is convenient for adjusting the position of the nozzle. The partial overlap of spray ranges allows for better rainfall uniformity.
The miniature high-pressure water pump 2 draws out the pure water from the water storage tank 1, and rivers flow into miniature flowmeter 4 behind the pump, then get into the shower nozzle supply channel, by the 5 blowout of high pressure atomizing rainfall shower nozzle. The miniature high-pressure water pump 2 controls the line data channel to be connected to a data acquisition instrument 20 of the control room. During the test, the rainfall intensity is adjusted in real time according to the collected flow data obtained by the micro flow meter 4, and the water supply rate is adjusted by using the DC speed regulator 7 so as to meet the requirement of the rainfall intensity required by the test working condition.
The slope water content monitoring system mainly comprises an EC-5 water content sensor 17, a soil matrix suction sensor 18, a water-stop sheet bottom water level sensor 25, a static data acquisition processor 20 and a control room computer 21 which are embedded in the slope.
The EC-5 water content sensor 17 soil matrix suction sensor 18 and the depth extending inside the slope body are distributed unevenly, the arrangement is dense near the slope surface, and the inside of the slope body is sparse. The characteristic of rainwater infiltration on the slope is mainly considered, and the arrangement mode is reasonable. The water content sensor and the soil matrix suction sensor are correspondingly embedded, the obtained data are mutually corresponding, and a real-time water and soil characteristic curve can be obtained.
The fiber bragg gratings 27 are uniformly arranged inside the slope body along the transverse direction and the longitudinal direction, and deformation data inside the slope body can be accurately obtained by monitoring the change of the light path in the experimental process. The fiber grating system also includes its own optical signal generator and signal receiver 28, which converts the optical signal into an electrical signal and inputs the electrical signal to the data processor 20.
The water storage space 16 under the water-proof bottom plate is close to the bottom of the model box, and a water level sensor 25 is installed for monitoring the water quantity gathered by the slope runoff, and the water level sensor and the water content sensor 17 work cooperatively to quantify the slope seepage amount and the slope runoff amount in the rainfall process, study the rainfall seepage process and evolution path on the slope, and reveal the influence process of the water seepage on the slope stability.
The soil pressure sensor 26 is buried in the high and steep slope model 24, and the internal stress change of the slope body caused by rainfall is monitored in real time; three non-contact infrared displacement sensors 19 are arranged on the front surface and the top of the slope body and used for detecting the horizontal displacement of the slope surface and the vertical displacement of the top of the slope; the deformation inside the slope is monitored by the fiber grating 27 inside the slope.
The data acquisition instrument 20 is placed in a control room of the centrifuge and is connected with various sensors in the model box through a reserved signal channel of the centrifuge, wherein the sensors comprise an EC-5 water content sensor 17, a water level sensor 18 at the bottom of a water-stop sheet, a soil pressure sensor 26, a water level transmitter 8 of a water storage tank, a micro flow meter 4, an infrared displacement sensor 19, a fiber bragg grating 27 and the like.
The high-speed camera system includes a high-speed camera 23 located inside the mold box and a high-speed camera mount 22 fixed to the box body upper cover 11. The high-speed camera 23 has a large-capacity memory, and can transmit the shot content to other mobile devices such as a mobile phone in a wireless real-time manner in a local area network. And the anti-shake stabilization function of the device also ensures the shaking and other adverse conditions inside the box body during the effective customer service test, effectively records the whole rainwater infiltration and slope scouring conditions of the test slope body, records the crack development, extension and penetration conditions of the slope surface, and records the complete instability process of the high and steep slope body.
The utility model discloses high steep slope atress deformation characteristic centrifuge model test system's specific operating procedure under the rainfall condition is as follows:
1. and according to geological survey data of the site work point, testing the physical and mechanical parameters of the rock and soil mass material indoors. Selecting model materials, and simulating physical and mechanical parameters of different slope stratum structures according to a model test similarity theory. Before the test, a required model soil sample is prepared in advance, and is sealed and kept stand for 48 hours.
2. The layered water-stop floor 12 and the lower water level sensor 25 are installed. The organic glass side wall 10 is installed, and the gap is sealed by glass cement to prevent water leakage. A porous toe support 13 is installed, and a filtering sponge 14 is filled behind the support.
3. And filling a slope model in layers and blocks and compacting. And an EC-5 water content sensor 17, a soil matrix suction sensor 18 and a soil pressure sensor 26 are buried during filling. And uniformly distributing the fiber bragg gratings 27 in the transverse direction and the longitudinal direction in the slope, weighing the required soil sample according to the design density of the model, and filling and compacting the soil sample one by one.
4. And (4) after the model is integrally filled, cutting off redundant soil according to the reserved slope surface line by using a slope cutting method, leading out various sensor signal lines, and finishing the manufacture of the high and steep slope body model.
5. According to the requirement of rainfall uniformity, the positions and the arrangement intervals of the high-pressure atomizing nozzles 5 are determined, and the positions of the nozzle supports 6 are fixed. And fixing the bracket on two side walls of the model box, and locking the positive and negative screw nuts by using a spanner for fixing. And then adjusting the angle and the distance of the spray nozzle fixing clamps, so that the rainfall coverage surfaces of all the spray nozzles are partially overlapped at the slope surface, and the uniformity of the slope rainfall is ensured.
6. The upper case cover 11 is attached, the upper case cover 11 is lifted by a gantry crane, and the high-speed camera 23 is attached to the lower portion of the upper cover. And slowly hoisting the upper cover of the box body in place, and leading out the signal line and the water supply pipeline in the model box from the opening of the upper cover. A water storage tank 1, a micro high-pressure water pump 2, an electromagnetic valve 3, a micro flow meter 4 and an upper cover are fixed at the reserved position by using bolts, and pipelines are connected and the communication state is tested. The upper cover is locked by bolts, and the opening of the upper cover is sealed by a sealing film.
7. The whole model box is hung into a rotary arm hanging basket of the centrifuge and fixed, all signal lines and ports are connected, the ports are led out from a control room and connected with a static data acquisition processor 27, and the acquisition condition is checked. And detecting the working conditions of various sensors and the working conditions of the miniature high-pressure water pump 2. And checking the shooting condition of the image system. The centrifuge chamber was closed and the model was allowed to stand for 48 hours before the actual test.
8. And entering a formal test stage after the centrifuge is started up and reaches a preset rotating speed. Keeping the preset rotating speed of the centrifuge stable, initially solidifying the model for 1 hour, and then starting a rainfall system to simulate different rains with different intensities and durations. And correcting and adjusting rainfall intensity according to the real-time flow data obtained by the micro flow meter 4 so as to accurately simulate different rainfall working conditions.
10. The high speed camera is monitored and recorded to record the progress of crack development, propagation and breakthrough and the point in time at which it occurred.
11. And stopping the machine after the test rainfall loading process is finished. And storing the test data and the high-speed camera image. And integrally hanging out the model box, opening the box, sampling and photographing. And (4) removing the model and cleaning the model box.
12. The centrifugal machine model test of the stress deformation characteristic of the high and steep slope under the rainfall condition, which is completed according to the steps, can carry out multiple tests on the high and steep slope models 24 with different slopes under different rainfall conditions, and analyze the influence process of the rainfall intensity, the holding time and different reinforcement conditions on the stress deformation of the slope body. The test data comprises the crack cracking and communicating process of the slope surface, the water content, the matrix suction and the soil pressure measured by various sensors and the internal and external deformation data of the slope body measured by the fiber grating and the infrared displacement meter. And comprehensively analyzing and determining the critical condition of the stress deformation instability of the high and steep slope under the rainfall condition by combining the data of the slope infiltration amount and the slope runoff amount in the rainfall process. The scope of the present invention is not limited to the above-described embodiments.
13. The utility model discloses it is right to have adopted specific engineering case the utility model discloses the principle and implementation method have carried out the system explanation, and above-mentioned detailed embodiment explanation is only used for introducing the utility model discloses a method and embodiment. The foundation the utility model discloses a multiple combination operating mode research can be developed to concrete implementation method and test range. The technical solution according to the present invention, those skilled in the art can derive other embodiments, which also belong to the technical innovation scope of the present invention.
Claims (10)
1. A centrifugal machine model test system for the stress deformation characteristic of a high and steep slope under the rainfall condition is characterized by comprising a centrifugal layered seepage model box, a rainfall simulation control system, a slope water content monitoring system, a slope stress deformation monitoring system and a high-speed camera system; a high and steep slope model (24) is arranged in the centrifugal layered seepage model box, the rainfall simulation control system is arranged at the upper end of the centrifugal layered seepage model box and faces downwards to the high and steep slope model (24), the detection sensors of the slope water content monitoring system and the slope stress deformation monitoring system are arranged in the high and steep slope model (24), and the high-speed camera system is arranged in the centrifugal layered seepage model box and faces to the high and steep slope model (24).
2. The centrifugal machine model test system for the high and steep slope stress deformation characteristic under the rainfall condition is characterized in that the rainfall simulation control system comprises a water storage tank (1), a water storage tank water level transmitter (8), a high-pressure micro water pump (2), an electromagnetic valve (3), a micro flow meter (4), a high-pressure atomization rainfall spray head (5), a spray head fixing support (6) and a DC speed regulator (7); the high-pressure atomization rainfall spray nozzles (5) are provided with a plurality of groups and are arranged on the spray nozzle fixing bracket (6); the multiple groups of high-pressure atomization rainfall nozzles (5) face downwards to the test slope body.
3. The centrifugal machine model test system for the high and steep slope stress-deformation characteristic under the rainfall condition is characterized in that the centrifugal layered seepage model box comprises an aluminum model box (9), organic glass side walls (10) and a box body upper cover (11), wherein a layered water-stop bottom plate (12) and a perforated toe support (13) are arranged inside the aluminum model box (9); the porous slope toe support (13) is arranged at the slope toe of the high and steep slope model (24), the layered water-stop bottom plate (12) is provided with the seepage holes (15), and the layered water-stop bottom plate (12) separates the bottom of the centrifugal layered seepage model box into a water-stop bottom plate lower space (16).
4. The centrifugal machine model testing system for the stress-deformation characteristic of the high and steep slope under the rainfall condition as claimed in claim 3, wherein the slope water content monitoring system mainly comprises a plurality of groups of EC-5 water content sensors (17) and soil matrix suction sensors (18) buried in the high and steep slope model (24), a water-stop plate lower water level sensor (25) arranged in a lower space (16) of a water-stop bottom plate, a multi-channel data acquisition instrument (20) and a computer (21).
5. The centrifugal machine model testing system for the stress-deformation characteristics of the high and steep slope under the rainfall condition as claimed in claim 4, wherein the slope body stress-deformation monitoring system mainly comprises a plurality of groups of soil pressure sensors (26) buried in the high and steep slope model (24), an optical fiber grating (27) and three non-contact infrared displacement sensors (19) arranged on the slope surface of the high and steep slope model (24).
6. The centrifugal machine model testing system for the stress deformation characteristic of the high and steep slope under the rainfall condition as claimed in claim 5, wherein the high-speed camera system comprises a camera fixing support (22) and a high-speed camera (23), the camera fixing support (22) is arranged inside the centrifugal layered seepage model box, and the high-speed camera (23) faces the slope surface of the high and steep slope model (24).
7. The centrifugal machine model test system for the high and steep slope stress-deformation characteristic under the rainfall condition is characterized in that a filtering sponge (14) is arranged inside the porous slope toe support (13).
8. The centrifugal machine model test system for high and steep slope stress-deformation characteristics under rainfall conditions is characterized in that the layered water-proof bottom plate (12) is made of aluminum, and the layered water-proof bottom plate (12) is supported at the bottom of the centrifugal layered seepage model box through a plurality of rectangular support legs.
9. The centrifugal machine model test system for the high and steep slope stress-deformation characteristics under the rainfall condition as claimed in claim 8, wherein the seepage holes (15) are arranged on one side of the layered water-proof bottom plate (12) close to the slope toe, and the number of the seepage holes is sixteen.
10. The centrifuge model test system for high and steep slope stress-deformation characteristics under rainfall conditions according to claim 2, wherein the high-pressure atomized rainfall sprayers (5) are provided with 18 groups, and the groups are arranged on the sprayer fixing bracket (6) in three rows.
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