Thermosetting and shearing characteristic testing system for non-displacement pile contact interface

Abstract

The utility model provides a thermosetting and shearing characteristic testing system for a non-displacement pile contact interface. The thermosetting and shearing characteristic testing system comprises a filter pressing and shearing container, a pressurizing, grouting and constant-pressure device, a pressurizing and temperature control device and a shearing loading device. The filter pressing and shearing container comprises a left container main body, a right container main body and a filter pressing and shearing chamber; the pressurized grouting and constant pressure device comprises a slurry storage container and a pressure conveyor, and the slurry storage container is communicated with the filter pressing and shearing chamber; the pressure conveyor is communicated with the slurry storage container; the pressurization and temperature control device is arranged on the outer part, close to the left container main body, of the filter pressing and shearing container; and the shear loading device is arranged outside the filter pressing shear container. According to the utility model, a reliable experimental means is provided for researching the performance of the non-compaction pile in practical application, and the safety and durability of a building are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pile foundation engineering technical field especially relates to a non soil squeezing pile contact interface thermal solidification and shearing characteristic test system. BACKGROUND

[0002] Energy pile, as an innovative structure combining ground source heat pump technology with traditional pile foundation, has been widely concerned and applied. It utilizes geothermal resources in an environmentally friendly and efficient way to achieve building heating and refrigeration. In the field of construction, the application of energy piles has achieved certain results, especially in energy saving and environmental protection and improving building energy efficiency. With the continuous growth of people's demand for sustainable development and green building, energy piles as green energy utilization technology have broad market prospects and development space. Recently, energy piles dominated by energy piles with side grouting non soil squeezing pile (such as drill-in follow-up pipe pile, static drill root planting bamboo joint pile, etc.) have developed rapidly.

[0003] However, in the heat cycle process of energy pile, the pile body and the soil around the non soil squeezing energy pile will expand and contract due to heat, and the soil around the pile may also produce thermal consolidation deformation under temperature stress, which has a great influence on the bearing capacity of non soil squeezing energy pile based on side grouting (such as drill-in follow-up pipe pile, drill-in follow-up energy pile, etc.). Therefore, it is very important to explore the influence of energy pile heat exchange on the consolidation deformation of side soil.

[0004] The side grouting non soil squeezing pile represented by drill-in follow-up energy pile has a typical "pile-grouting-soil" contact interface, and the thermal consolidation of side soil will change the structure and stress characteristics of the contact interface, which has a great influence on the side friction of the pile. Therefore, effective testing of the "pile-grouting-soil" contact interface is the key to calculating the bearing characteristics of the drill-in follow-up energy pile. As a new type of pile, there is no special testing equipment for the shear characteristics of the "pile-grouting-soil" contact interface of the drill-in follow-up energy pile.

[0005] Therefore, the utility model provides a non soil squeezing pile contact interface thermal solidification and shearing characteristic test system to overcome the above defects. UTILITY MODEL CONTENTS

[0006] The utility model provides a non soil squeezing pile contact interface thermal solidification and shearing characteristic test system, which is used to solve the problems in the prior art, can more comprehensively simulate the thermal solidification and shearing characteristics of the "pile-grouting-soil" contact interface in actual engineering, and provides a reliable experimental method for studying the performance of non soil squeezing pile in actual application. Through studying the thermal solidification and shearing characteristics of the pile-grouting-soil contact interface, the design and construction process of pile foundation can be optimized, and the safety and durability of the building can be improved.

[0007] The technical scheme of the utility model is as follows:

[0008] A thermal and shear property testing system of a non-soil displacement pile contact interface, comprising:

[0009] The filter press shear container is used for making a pile-paste-soil model block, and comprises a left container body for containing concrete and a right container body for containing soil, and a filter press shear chamber arranged in the middle and communicating with the left container body and the right container body; wherein the left container body and the right container body are made of transparent acrylic plates, the left container body is provided with an S-shaped water pipe, and the left container body is provided with a plurality of first temperature sensors on the side close to the filter press shear chamber; the right container body is provided with a plurality of pore pressure sensors on the side close to the filter press shear chamber, and the right container body is provided with a displacement monitoring element for monitoring the displacement of the soil in the filter press shear chamber, a first pressure monitoring element for monitoring the pressure of the soil on the container wall in the right container body, and a drainage hole for collecting and detecting the paste.

[0010] The left container body and the right container body are made of transparent acrylic plates to facilitate observation of the non-soil displacement pile dynamics.

[0011] The pressurized grouting and constant pressure device comprises a paste storage container and a pressure conveyor, the paste storage container communicates with the filter press shear chamber, and the paste storage container is provided with a second pressure monitoring element; the pressure conveyor communicates with the paste storage container and is used for conveying air and paste in the paste storage container to the filter press shear chamber, and the pressurized grouting and constant pressure device is a detachable device.

[0012] The pressurizing and temperature control device is arranged outside the left container body of the filter press shear container, and the pressurizing and temperature control device communicates with the water inlet and outlet of the S-shaped water pipe in the left container body.

[0013] The shear loading device is arranged outside the filter press shear container, and the shear loading device abuts against the top wall of the left container body, the bottom wall of the right container body and the side wall of the right container body, respectively.

[0014] Preferably, the thermal and shear property testing system comprises a grouting state and a grouting solidification state, when in the grouting state, the thermal and shear property testing system is horizontally placed; when in the grouting solidification state, the thermal and shear property testing system is vertically placed, and the pressurized grouting and constant pressure device is in a detached state.

[0015] As preferred, the first temperature sensors are fixedly installed on the first support frame at equal intervals and fixed to the inside of the left container body through the first support frame; and the pore pressure sensors are fixedly installed on the second support frame at equal intervals and fixed to the inside of the right container body through the second support frame.

[0016] As preferred, an adjusting valve for adjusting the pressure is arranged on the connecting passage between the slurry storage container and the pressure conveyor.

[0017] As preferred, the pressurizing and temperature control device comprises a water storage container and a connecting water pipe, the connecting water pipe passes through the water storage container, a circulating water pump is arranged at the middle position of the connecting water pipe in the water storage container, heating structures are arranged on the outer walls of the connecting water pipes on both sides of the circulating water pump in the water storage container, and the two ends of the connecting water pipe are respectively communicated with the water inlet and the water outlet of the S-shaped water pipe to form a closed circulating water path.

[0018] As preferred, the shear loading device comprises a fixing frame, a tangential force loading structure and a normal force loading structure, the tangential force loading structure and the normal force loading structure are both installed on the fixing frame; the tangential force loading structure is in abutment with a side wall of the right container body, and a tangential force sensor and a shear displacement sensor are further arranged on the side wall; the normal force loading structure is in abutment with a bottom wall of the right container body away from the left container body, and a normal force sensor and a normal displacement sensor are further arranged on the bottom wall; the top of the fixing frame is connected and fixed to the top of the left container body through a connecting frame, a plurality of fixing columns are further arranged on the fixing frame, and the fixing columns are respectively in abutment with the side walls of the left container body.

[0019] As preferred, a plurality of through holes are arranged on the top of the filter-pressing shear chamber, at least including a first through hole, a second through hole and a third through hole, the first through hole is used for placing the input pipe of the pressure conveyor; the second through hole is an exhaust hole; the third through hole is used for placing a pressure gauge; and the second through hole and the third through hole are sealable through holes.

[0020] As preferred, a slurry collection and detection device is arranged at the bottom of the liquid discharge hole.

[0021] As preferred, the heat setting and shear property testing system further comprises a PIV monitoring device, the PIV monitoring device is arranged outside the filter-pressing shear container, and the camera of the PIV monitoring device is used for front shooting of the whole filter-pressing shear container.

[0022] As preferred, the displacement monitoring element comprises an LVDT displacement meter and an inductive sheet, the inductive sheet is parallel to the right side wall of the right container body and arranged inside the right container body, and the inductive sheet is connected to the bottom of the LVDT displacement meter.

[0023] Compared with the prior art, the hot solidification and shearing characteristic test system has the beneficial effects that:

[0024] The hot solidification and shearing characteristic test system in the utility model, through the synergistic effect of the filter pressing and shearing container, the pressurized grouting and constant pressure device, the pressurizing and temperature control device and the shearing loading device, can more comprehensively simulate the hot solidification and shearing characteristics of the "pile-grout-soil" contact interface in actual engineering, and provides a reliable experimental method for researching the performance of the non-soil displacement pile in actual application.

[0025] In addition, the systems work cooperatively, reduces the human error in the experimental process, and improves the experimental efficiency and accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a left container main body structure schematic view of the hot solidification and shearing characteristic test system in the utility model specific embodiment;

[0027] Figure 2 It is a right container main body structure schematic view of the hot solidification and shearing characteristic test system in the utility model specific embodiment;

[0028] Figure 3 It is a filter pressing and shearing container structure schematic view of the hot solidification and shearing characteristic test system in the utility model specific embodiment;

[0029] Figure 4 It is a grouting state schematic view of the hot solidification and shearing characteristic test system in the utility model specific embodiment;

[0030] Figure 5 It is a grouting solidification state structure schematic view of the hot solidification and shearing characteristic test system in the utility model specific embodiment; Figure 1

[0031] Figure 6 It is a structure schematic view of the hot solidification and shearing characteristic test system in the utility model specific embodiment; Figure 2 .

[0032] ​Wherein: 1, left container main body; 10, S-shaped water pipe; 101, water inlet; 102, water outlet; 11, first temperature sensor; 12, first support frame;

[0033] 2, right container main body; 20, displacement monitoring element; 21, first pressure monitoring element; 22, liquid discharge hole; 23, hole pressure sensor; 24, second support frame;

[0034] 3, pressurized grouting and constant pressure device; 30, grout storage container; 31, pressure conveyor;

[0035] 4, pressurization and temperature control device; 40, water storage container; 41, connecting water pipe; 42, circulating water pump; 43, heating wire;

[0036] 5, shear loading device; 50, fixing frame; 51, tangential force loading structure; 52, normal force loading structure;

[0037] 61, first through hole; 62, second through hole; 63, third through hole;

[0038] 7, slurry collection and detection device;

[0039] 8, filter pressing shear chamber 102. DETAILED DESCRIPTION

[0040] The technical scheme of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0042] The present embodiment discloses a non-soil-displacement pile contact interface thermal solidification and shear property testing system, which will be described below in conjunction with the drawings Figure 1 to the drawings Figure 6And specific embodiments, detailed discussion of the present application, in order to be able to more comprehensive simulation of the “pile-paste-soil” contact interface in the actual engineering thermal solid and shear properties, for the study of non-extrusion pile in the actual application of performance to provide reliable experimental means; and by studying the thermal solid and shear properties of pile-paste-soil contact interface, to optimize the design and construction technology of pile foundation, improve the safety and durability of the building.

[0043] The embodiment discloses a kind of thermal solid and shear properties of non-extrusion pile contact interface test system, including pressure filtration shearing container, pressurized grouting and constant pressure device 3, pressurization and temperature control device 4 and shearing loading device 5.

[0044] Pressure filtration shearing container, including left container main body 1 for containing concrete and right container main body 2 for containing soil body, and the pressure filtration shearing chamber being set in the middle and being communicated with left container main body 1 and right container main body 2;Wherein, left container main body 1 and right container main body 2 are transparent acrylic plate material, S-shaped water pipe 10 is provided in left container main body 1, S-shaped water pipe 10 is used to contain medium of different temperatures, to verify the influence of different temperatures on the pile body in left container main body 1.

[0045] Left container main body 1 is provided with a plurality of first temperature sensors 11 on the side close to the pressure filtration shearing chamber, and the plurality of first temperature sensors 11 are fixedly installed on the first support frame at equal intervals and fixed to the inside of left container main body 1 through the first support frame, for monitoring the temperature of the concrete in left container main body 1. Three first temperature sensors 11 are provided, which can more comprehensively understand the temperature of the concrete at different height positions in left container main body 1. Since the concrete in the container can have non-uniform temperature, the plurality of first temperature sensors 11 can capture the temperature change at different heights, avoiding the problem of inaccurate local temperature monitoring caused by only setting one first temperature sensor 11. At the same time, the temperature change trend of concrete at different height positions with time can be observed, which is very helpful for studying the temperature conduction, heat diffusion and other characteristics of concrete in the heat exchange process, and provides more detailed data for in-depth understanding of the performance change of pile body under different temperature conditions.

[0046] Right container main body 2 is provided with a plurality of pore pressure sensors 23 on the side close to the pressure filtration shearing chamber, and the plurality of pore pressure sensors 23 are fixedly installed on the second support frame at equal intervals and fixed to the inside of right container main body 2 through the second support frame.

[0047] The displacement monitoring element 20 is used to monitor the displacement of the soil in the pressure filtration and shearing chamber, the first pressure monitoring element 21 is used to monitor the pressure of the soil in the right container body 2 on the container wall, and the liquid discharge hole 22 is used for slurry collection and detection. The bottom of the liquid discharge hole 22 is provided with a slurry collection and detection device 7. As a preferred embodiment, the slurry collection and detection device 7 is a steel funnel fixed at the liquid discharge hole 22 by bolts, which is used to collect the liquid exuded from the soil. A valve is arranged at the bottom of the steel funnel to control the outflow of the stored water. At the same time, the water in the steel funnel is drained to a water quality detector by a soft water pipe. The water quality detector can monitor the substances contained in the water after the natural soil is compacted, and can also monitor the new mixed solution formed after the slurry is injected into the soil. By comparing the exuded solution before and after the natural soil is compacted, the types and contents of chemical substances can be analyzed. This is of great significance for studying the interaction between the slurry and the soil, the change of the physical and chemical properties of the soil, and the performance of the pile-slurry-soil contact interface.

[0048] The left container body 1 and the right container body 2 are made of transparent acrylic plates to facilitate observation of the dynamic non-soil displacement pile.

[0049] The pressurized grouting and constant pressure device 3 includes a slurry storage container 30 and a pressure conveyor 31. The slurry storage container 30 is connected to the pressure filtration and shearing chamber, and is provided with a second pressure monitoring element. The pressure conveyor 31 is connected to the slurry storage container 30, and is used to convey air and slurry in the slurry storage container 30 to the pressure filtration and shearing chamber. The pressurized grouting and constant pressure device 3 is a detachable device. An adjusting valve is arranged on the connection channel between the slurry storage container 30 and the pressure conveyor 31 to adjust the pressure.

[0050] The pressurizing and temperature control device 4 is arranged outside the pressure filtration and shearing container near the left container body 1. The pressurizing and temperature control device 4 is connected to the water inlet 101 and the water outlet 102 of the S-shaped water pipe 10 in the left container body 1.

[0051] In the embodiment, the pressurizing and temperature control device 4 comprises a water storage container 40, a connecting water pipe 41 passing through the water storage container 40, a circulating water pump 42 arranged at a middle position of the connecting water pipe 41 in the water storage container 40, and a heating structure arranged on the outer wall of the connecting water pipe 41 on both sides of the circulating water pump 42 in the water storage container 40. The two ends of the connecting water pipe 41 are respectively communicated with the water inlet 101 and the water outlet 102 of the S-shaped water pipe 10 to form a closed circulating water path. In the embodiment, the connecting water pipe 41 is a stainless steel pipe with a diameter of 2 cm, which has good heat transfer effect. The circulating water pump 42 is a high-power and high-flow circulating water pump 42 with a power of 200 W and a flow rate of 2 m3 / h. The circulating water pump 42 can ensure that the flow rate of water reaches 5 cm / s, so that the water can achieve good heat transfer or cooling effect on the thermal consolidation effect of the pile body in the left container body 1.

[0052] In the embodiment, the heating structure is preferably a 25 W carbon fiber heating wire 43, which has high conversion efficiency and small load on the pressurizing and temperature control device 4 after long-term use, and meets the experimental requirements.

[0053] In the embodiment, the thermal consolidation and shear property testing system comprises a grouting state and a grouting solidification state. When in the grouting state, the thermal consolidation and shear property testing system is horizontally placed. When in the grouting solidification state, the thermal consolidation and shear property testing system is vertically placed, and the pressurized grouting and constant pressure device 3 is in a disassembled state.

[0054] Preferably, the thermal consolidation and shear property testing system further comprises a PIV monitoring device arranged outside the pressure filtration and shear container, and a camera of the PIV monitoring device is arranged to frontally shoot the whole pressure filtration and shear container.

[0055] Preferably, the displacement monitoring element 20 comprises an LVDT displacement meter and an inductive sheet. The inductive sheet is parallel to the right side wall of the right container body 2 and arranged inside the right container body 2. The inductive sheet is connected to the bottom of the LVDT displacement meter. In the embodiment, three small round holes with a diameter of about 5 mm are reserved on the side wall of the right container body 2 for placing the LVDT displacement meter. The bottom of the LVDT displacement meter penetrates into the side wall of the right container body 2, and the inductive sheet is connected to the bottom of the LVDT displacement meter. The displacement monitoring element 20 can monitor the displacement of the soil in the pressure filtration and shear chamber at different height positions at the same time. Since the displacement of the soil under pressure may be different at different heights, multiple displacement monitoring elements 20 can more comprehensively reflect the overall displacement change of the soil and avoid the limitation of single position monitoring. The three small round holes are equally spaced along the height direction of the right container body 2, which can make the monitoring data more representative and help analyze the distribution law of the soil displacement in the vertical direction.

[0056] In order to further fix the displacement monitoring element 20 and avoid displacement deviation, the LVDT displacement meter needs to be fixedly connected with the right container body by hot melt adhesive, so as to prevent the position deviation of the LVDT displacement meter and cause reading error. The inductive sheet is preferably an iron sheet, which is arranged parallel to the side wall of the right container body 2, and has an area of about 4 cm2and a thickness of about 2 mm, and is used for monitoring the displacement of the soil in the filter pressing shear chamber. On the one hand, the inductive sheet increases the contact area with the soil, so that the displacement monitoring can better reflect the actual displacement of the soil; on the other hand, the inductive sheet is arranged parallel to the right side wall of the right container body 2, which helps to keep the measurement direction of the LVDT displacement meter consistent with the displacement direction of the soil, and further improves the monitoring accuracy.

[0057] In the embodiment, the first pressure monitoring element 21 is preferably a pressure sensor, which is fixed on the inner side wall of the right container body 2 by hot melt adhesive, and is arranged in three, which are arranged at equal intervals from top to bottom along the height direction of the right container body 2, and is used for monitoring the pressure of the soil in the right container body 2 on the filter pressing shear container wall. The three pressure sensors can monitor the pressure of the soil in the right container body 2 on the filter pressing shear container wall at different height positions, and the pressure of the soil on the container wall may change in the vertical direction, and multiple pressure sensors can comprehensively understand the distribution of the soil pressure, and provide more detailed data for analyzing the mechanical behavior of the soil in the filter pressing shear process.

[0058] The shear loading device 5 is arranged outside the filter pressing shear container, and in the embodiment, the shear loading device 5 includes a fixing frame 50, a tangential force loading structure 51 and a normal force loading structure 52, wherein the tangential force loading structure 51 and the normal force loading structure 52 are both installed on the fixing frame 50; the tangential force loading structure 51 abuts against the right side wall of the right container body 2, and the right side wall is further provided with a tangential force sensor and a shear displacement sensor; the normal force loading structure 52 abuts against the bottom wall of the right container body 2 away from the left container body 1, and the bottom wall of the right container body 2 is further provided with a normal force sensor and a normal displacement sensor; the shear loading device 5 further abuts against the top of the left container body 1 through a support.

[0059] The tangential force sensor, the shear displacement sensor, the normal force sensor and the normal displacement sensor are arranged, so that the size of the tangential force and the normal force and the displacement of the right container body 2 in the corresponding direction can be monitored in real time, which provides accurate data for studying the mechanical behavior of the pile-soil interface under the action of shear and normal force. At the same time, by monitoring the displacement and stress changes, the deformation, strength characteristics and failure mode of the pile-soil interface in different loading stages can be understood, which provides a basis for evaluating the stability and reliability of the interface.

[0060] In the embodiment, the tangential force loading structure 51 and the normal force loading structure 52 are both jacks, respectively, a transversely arranged jack and a longitudinally arranged jack, and the jack can provide stable and controllable loading force, and by adjusting the pressure of the jack, the size of the tangential force and the normal force applied to the right container body 2 can be accurately controlled to meet the needs of different experimental conditions. At the same time, the jack is a common loading device, and the operation is relatively simple. The experimental personnel can conveniently adjust the pressure of the jack to realize the control of different loading levels, improve the operability and efficiency of the experiment.

[0061] The thermal consolidation and shear characteristic test system in the utility model, through the synergistic effect of the pressure filtration shear container, the pressure grouting and constant pressure device 3, the pressure and temperature control device 4 and the shear loading device 5, can more comprehensively simulate the thermal consolidation and shear characteristics of the pile-grout-soil contact interface in the actual engineering, and provides a reliable experimental method for researching the performance of the non-soil displacement pile in the actual application. And by researching the thermal consolidation and shear characteristics of the pile-grout-soil contact interface, the design and construction process of the pile foundation can be optimized, and the safety and durability of the building can be improved.

[0062] At the same time, the first temperature sensor 11 in the left container body 1 can accurately monitor the temperature change of the concrete grout, which helps to study the influence of temperature on the performance of the pile body and provides data support for optimizing the design and construction of the energy pile. The displacement monitoring element 20 and the first pressure monitoring element 21 on the right container body 2 can monitor the displacement of the soil and the pressure of the soil on the container wall respectively, and provide key data for analyzing the deformation and stress characteristics of the soil around the pile in the thermal consolidation and shear process. The pore pressure sensor 23 in the right container body 2 can monitor the pore pressure of the soil, which is of great significance for studying the change of the pore water pressure of the soil in the thermal consolidation and shear process. The second pressure monitoring element in the pressure grouting and constant pressure device 3 can monitor the pressure value in the system, which is convenient for accurately controlling the grouting pressure and ensuring the accuracy and repeatability of the experimental conditions. And the regulating valve in the pressure grouting and constant pressure device 3 can adjust the pressure in the system, which can simulate the performance change of the pile-grout-soil contact interface under different grouting pressure conditions, and provide a basis for optimizing the design and construction of the energy pile. And by adjusting the water temperature in the water pipe through the pressure and temperature control device 4, the performance change of the pile body under different temperature environments can be simulated, and the thermal consolidation characteristics of the energy pile under different working temperatures can be studied.

[0063] It can be seen that the utility model can collect data of various parameters such as temperature, displacement, pressure, pore water pressure, etc. through various monitoring elements, and provide rich data support for in-depth study of the characteristics of the pile-grout-soil contact interface.

[0064] In addition, the systems work together to reduce human error during the experiment, improve the efficiency and accuracy of the experiment. The sealed connection of the device and the accurate monitoring element can ensure the stability and reliability of the experimental conditions, providing protection for obtaining accurate experimental results; so that the technical scheme can provide scientific basis for the design, construction and performance evaluation of non-soil squeezing pile, and help to improve the application level and market competitiveness of green energy utilization technology such as energy pile.

[0065] In the embodiment, the left container body 1 and the right container body 2 are detachably fixedly connected, and the connecting band provided at the abutting position of the left container body 1 and the right container body 2 is preferably a rubber sealing band, which realizes the sealed and fixed connection between the left container body 1 and the right container body 2. Specifically, the rubber sealing band is at least one turn around the abutting position of the left and right container bodies 22, and the connecting band can be bonded to the container body by hot melt adhesive, and adjacent rubber sealing bands can be fixed by bolts. The rubber sealing band is at least one turn around the abutting position of the left and right container bodies 2, which can form a good sealing effect to prevent liquid or gas leakage during the experiment, thereby ensuring the accuracy and stability of the experimental conditions. In the embodiment, a plurality of through holes are formed at the top of the filter pressing shear chamber formed by the abutting of the rubber sealing bands. In the embodiment, three through holes are provided, including a first through hole 61, a second through hole 62 and a third through hole 63. The first through hole 61 is used for placing the input pipe of the pressure conveyor 31; the second through hole 62 is used for exhausting air during grouting or using the pressure conveyor 31 for filter pressing, and the second through hole 62 can be sealed by hot melt adhesive; and the third through hole 63 is used for placing a pressure gauge, which can also be sealed by hot melt adhesive after installation of the pressure gauge.

[0066] In the embodiment, the left container body 11 and the right container body 22 are both made of transparent acrylic plates, so that the outside world can directly observe whether the soil in the filter pressing shear chamber is compacted or the progress of the filter pressing process through the acrylic plates.

[0067] The thermal consolidation and shear property testing system further comprises a PIV monitoring device, which is arranged outside the filter pressing shear container. The PIV monitoring device comprises a tripod and a camera mounted on the tripod, which is used to record the dynamic changes in the filter pressing shear container.

[0068] During use, the tripod is adjusted to the same height as the middle of the filter pressing shear container, and then fixed to the ground to avoid movement, ensuring that the tripod remains stable during shooting and does not shake due to slight external forces, thereby ensuring that the camera can stably shoot the conditions inside the container. During shooting, the tripod should not be touched, because even slight touching can cause the camera to shake, thereby affecting the accuracy and clarity of the shooting results.

[0069] The camera selects the type of standby time above 10 hours and the storage card capacity is greater than 64 GB, which can meet the demand of long time shooting, and the problem of frequent interruption of shooting to deal with power shortage or storage shortage is avoided, and the whole process from the beginning to the complete shear failure of the test block can be recorded completely. After starting, the camera is fixed on the tripod, and the photographing is remotely controlled through the Bluetooth remote controller, so that the operation is convenient and the influence of human proximity on the shooting stability is reduced. Ten photos are taken when the shear strength increases by one level and the stress is stable, these photos can be used for later PIV software analysis, and the change of the pile-slurry-soil interface under different shear strengths can be recorded in detail, and through the comparison and analysis of multiple groups of photos, the damage development trend of the interface in the shear process can be observed more accurately. The continuous shooting is carried out until the test block is completely sheared and destroyed, and the last failure form is recorded, which can provide intuitive and comprehensive image data for studying the thermal and shear properties of the pile-slurry-soil interface, and help to deeply analyze the damage mechanism and performance change law of the interface.

[0070] As preferred, the thermal and shear property testing system further comprises a data collection and processing module, the data collection and processing module comprises a data collector and a computer, the data collector is connected with the pressure filtration and shearing container, the pressure grouting and constant pressure device 3, the pressure and temperature control device 4, the shearing loading device 5, the slurry collection and detection device 7 and the PIV monitoring device through a plurality of data connection lines with a length of 5 m, and the data collector is connected with the computer, and the collected data information is uniformly transmitted to the computer, and the data is uniformly processed by the computer.

[0071] With the help of the unique software of each device, the on-off operation and data collection and processing of the devices can be controlled respectively, and the software used includes Origin software and PIVview2CDemo software. After installing the Origin software on the computer, the pressure intensity, the constant pressure intensity, the heating speed and the constant temperature temperature are set as preset values, the shear value and the pore pressure value of the soil body and the displacement value of the soil body are integrated to form a three-dimensional graph. After installing the PIVview2CDemo software on the computer, the photos in the camera are imported into the same folder, the contrast graph is continuously played by comparing every two pictures, a dynamic graph of the pile-slurry-soil interface from the intact state to the failure state can be generated, and finally the dynamic graph is edited by the computer, and a whole process video of the failure interface formation can be formed.

[0072] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A testing system for the thermo-firm and shear properties of the contact interface of a non-displacement pile, characterized in that, include: A pressure-shear container is used to make pile-grout-soil model test blocks; the pressure-shear container includes a left container body (1) for holding concrete and a right container body (2) for holding soil, and a pressure-shear chamber located in the middle and connecting the left and right container bodies; wherein the left and right container bodies are made of transparent acrylic sheet material, the left container body (1) is provided with an S-shaped water pipe (10), and the left container body (1) is provided with multiple first temperature sensors on the side near the pressure-shear chamber; the right container body... Multiple pore pressure sensors (23) are provided on the side of the body (2) near the filter shear chamber. On the bottom wall of the right container body (2) away from the filter shear chamber, there are displacement monitoring elements (20) for monitoring the displacement of the soil in the filter shear chamber, a first pressure monitoring element (21) for monitoring the pressure of the soil in the right container body (2) on the container wall in the right container body (2), and a drain hole (22) for collecting and detecting slurry. A slurry collection and detection device (7) is provided at the bottom of the drain hole (22). The pressurized grouting and constant pressure device (3) includes a slurry storage container (30) and a pressure conveyor (31). The slurry storage container (30) is connected to the filter shear chamber. The slurry storage container (30) is equipped with a second pressure monitoring element. The pressure conveyor (31) is connected to the slurry storage container (30) and is used to transport air and slurry in the slurry storage container (30) to the filter shear chamber. The pressurized grouting and constant pressure device (3) is a detachable device. A pressurizing and temperature control device (4) is installed on the outside of the filter press shear container near the left container body (1). The pressurizing and temperature control device (4) is connected to the inlet (101) and outlet (102) of the S-shaped water pipe (10) inside the left container body (1). The shear loading device (5) is installed in the grouting solidification state of the thermosetting and shear characteristics testing system and is set outside the filter press shear container. The shear loading device (5) abuts against the top wall of the left container body, the side wall of the left container body, the bottom wall of the right container body, and the side wall of the right container body.

2. The system for testing thermal and shear properties of the contact interface of a non-soil-displacement pile according to claim 1, wherein, The thermosetting and shear property testing system includes a grouting state and a grouting solidification state. When in the grouting state, the thermosetting and shear property testing system is placed horizontally; when in the grouting solidification state, the thermosetting and shear property testing system is placed vertically. The pressurized grouting and constant pressure device is in a disassembled state, and the filter shear container is connected to the shear loading device (5).

3. The system for testing thermal and shear properties of the contact interface of a non-soil-displacement pile according to claim 1, wherein, Multiple first temperature sensors (11) are fixedly mounted on the first support frame at equal intervals and are fixed inside the left container body (1) through the first support frame; multiple pore pressure sensors (23) are fixedly mounted on the second support frame at equal intervals and are fixed inside the right container body (2) through the second support frame.

4. The system for testing thermal and shear properties of the contact interface of a non-soil-displacement pile according to claim 1, wherein, The connection channel between the slurry storage container (30) and the pressure conveyor (31) is provided with a regulating valve for adjusting the pressure.

5. The system for testing thermal and shear properties of the contact interface of a non-displacement pile according to claim 1, wherein, The pressurizing and temperature control device (4) comprises a water storage container (40) and a connecting water pipe (41) penetrating through the water storage container (40), wherein a circulating water pump (42) is arranged at the middle position of the connecting water pipe (41) in the water storage container (40), the outer wall of the connecting water pipe (41) on both sides of the circulating water pump (42) in the water storage container (40) is provided with a heating structure, and the two ends of the connecting water pipe (41) are respectively communicated with the water inlet (101) and the water outlet (102) of the S-shaped water pipe (10) to form a closed circulating water path.

6. The system for testing thermal and shear properties of a contact interface of a non-soil-displacement pile according to claim 1 or 2, wherein The shear loading device (5) comprises a fixing frame (50), a tangential force loading structure (51) and a normal force loading structure (52), the tangential force loading structure (51) and the normal force loading structure (52) are both mounted on the fixing frame (50), the tangential force loading structure (51) abuts against a side wall of the right container body (2), and a tangential force sensor and a shear displacement sensor are further arranged on the side wall, the normal force loading structure (52) abuts against a bottom wall of the right container body (2) away from the left container body (1), and a normal force sensor and a normal displacement sensor are further arranged on the bottom wall, the top of the fixing frame (50) is connected and fixed to the top of the left container body (1) through a connecting frame, and a plurality of fixing columns (54) are further arranged on the fixing frame (50) and abut against the side walls of the left container body (1).

7. The system for testing thermal and shear properties of a non-displacement pile contact interface according to claim 1, wherein, A plurality of through holes are arranged on the top of the filter pressing shear chamber, at least including a first through hole (61), a second through hole (62) and a third through hole (63), the first through hole (61) is used for placing an input pipe of the pressure conveyor (31), the second through hole (62) is an exhaust hole, and the third through hole (63) is used for placing a pressure gauge; the second through hole (62) and the third through hole (63) are sealable through holes.

8. The system for testing thermal and shear properties of a non-displacement pile contact interface according to claim 1, wherein, The thermal solidification and shear property testing system further comprises a PIV monitoring device, the PIV monitoring device is arranged outside the filter pressing shear container, and a camera of the PIV monitoring device frontally shoots the whole filter pressing shear container.

9. The system for testing thermal and shear properties of a contact interface of a non-displacement pile according to claim 1, wherein, The displacement monitoring element (20) comprises an LVDT displacement meter and an inductive sheet, the inductive sheet is parallel to the right side wall of the right container body (2) and is arranged inside the right container body (2), and the inductive sheet is connected to the bottom of the LVDT displacement meter.

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