Early-stage temperature, humidity and strain test device and method for underground laminated wall lining

Abstract

The invention belongs to the technical field of underground space engineering, and particularly provides an early-stage temperature, humidity and strain test device and method for an underground laminated wall lining, which can simulate and control constraint conditions, environment temperature and environment humidity of the laminated wall lining. And the temperature, humidity, strain data and evolution law of the composite wall lining at the early age are obtained under strict control of a single variable, and guidance and experience are provided for cracking leakage control of the composite wall lining on site.

Description

Technical Field

[0001] The invention belongs to the technical field of underground space engineering, and in particular relates to an early temperature, humidity and strain test device and method for underground composite wall lining. Background Art

[0002] The cracking and leakage problems of urban underground space structures have always been the focus and difficulty of underground space structure engineering research, especially the cracking and leakage problems of composite wall lining structures. Composite wall lining structures have the characteristics of thin thickness and large specific surface area, and their temperature field and humidity field are easily affected by ambient temperature and humidity. In the early stage, due to the influence of concrete hydration heat, the composite wall lining will experience a sharp temperature rise and temperature drop process, accompanied by obvious temperature rise expansion and temperature drop contraction. Under the conditions of ambient temperature and humidity and external constraints, the composite wall lining is very prone to early cracking, which in turn causes leakage problems in the composite wall lining, seriously affecting the durability of the underground space structure, and in severe cases, it will also affect the stability of the structure.

[0003] However, there are few research materials related to the cracking and leakage problems of composite wall linings, and most of them are concentrated in actual projects. The research results are not ideal for solving the cracking and leakage problems of composite wall linings, which has caused great difficulties in controlling the cracking and leakage of composite wall linings.

[0004] CN116448640A provides an early temperature, humidity and strain test device and test method for composite walls, which simulates the composite wall structure by cooperating the inner prefabricated wall, the outer prefabricated wall and the middle cast-in-place wall, and then simulates the penetration of groundwater into the composite wall by setting a water injection and pressure device on the outer side of the composite wall. The device of the invention has a simple structure and is easy to use, but the composite wall structure that can be simulated is limited by the prefabricated wall, and the environmental factors and control means studied are also relatively simple. CN111077051 A places the concrete lining model sample in the lining model test system for testing, thereby simulating the cracking and internal water seepage behavior characteristics of different tunnel lining models under different internal chamber pressure and external chamber pressure environments. The above patent applications and other prior arts focus on the simulation of the environmental factor of groundwater penetration, while ignoring the influence of other environmental factors in urban underground space and complex conditions such as the interface between new and old concrete on wall cracking and leakage. Summary of the invention

[0005] The purpose of the present invention is to provide an early temperature, humidity and strain test device and method for underground composite wall lining, which can simulate and control the constraint conditions, ambient temperature and ambient humidity of the composite wall lining, and then strictly control the acquisition of the early age temperature, humidity and strain data and evolution law of the composite wall lining under a single variable, so as to provide guidance and experience for the cracking and leakage control of the composite wall lining on site.

[0006] The technical solution of the present invention is as follows:

[0007] An early temperature, humidity and strain test device for underground composite wall lining, which is arranged on a test floor slab and includes a boundary constraint plate, a support block, a monitoring component, a temperature and humidity control component and an external data receiving device;

[0008] The boundary constraint plate has a relative constraint surface and a fitting surface, the constraint surface has a plurality of protrusions, a plurality of boundary constraint plates are in close contact and enclosed to form an inner lining simulation cavity with an upper opening, the constraint surface is the inner wall of the inner lining simulation cavity, and concrete is poured into the inner lining simulation cavity to form a composite wall lining;

[0009] The support blocks include at least two side support blocks, at least one front support block, at least one back support block and at least one bottom support block which are respectively detachably fixed on the test floor slab, and the side support blocks, the front support blocks, the back support blocks and the bottom support blocks are respectively detachably attached to the attachment surfaces of the boundary constraint plates forming the side, front, back and bottom surfaces of the inner lining simulation cavity;

[0010] Among them, a hollow water storage cavity is formed inside the back support block and a plurality of water outlets are opened on the side thereof in contact with the boundary constraint plate. Water outlet holes are also opened at the corresponding positions of the boundary constraint plate on the back. The water in the water storage cavity can flow through the water outlets of the back support block and the water outlet holes of the boundary constraint plate in sequence into the lining simulation cavity; the front support block and the boundary constraint plate in contact with it are removed after the composite wall lining is formed;

[0011] The monitoring component includes a temperature sensor, a humidity sensor and a strain sensor arranged in the liner simulation cavity, and the temperature sensor, the humidity sensor and the strain sensor are respectively controlled and connected with an external data receiving device;

[0012] The temperature and humidity control component includes a temperature control layer and a humidity control layer. The temperature control layer, the humidity control layer and the front side of the composite wall lining are overlapped in sequence, and the temperature control layer and the humidity control layer are respectively controlled and connected with an external data receiving device; the humidity control layer controls the humidity of the front side of the composite wall lining and calculates the maximum inner and outer humidity difference of the composite wall lining according to the humidity data collected by the humidity sensor; the temperature control layer controls the temperature of the front side of the composite wall lining and calculates the maximum inner and outer temperature difference of the composite wall lining according to the temperature data collected by the temperature sensor.

[0013] In some preferred embodiments, the early temperature, humidity and strain testing device also includes a cooling component, the cooling component includes a cooling pipe and an intelligent temperature control water supply device, the main body of the cooling pipe is arranged in the lining simulation cavity, the two ends of the cooling pipe are located above the lining simulation cavity and are respectively connected to the intelligent temperature control water supply device, and the intelligent temperature control water supply device is controlled and connected to the external data receiving device.

[0014] In some preferred embodiments, the intelligent temperature-controlled water supply equipment includes two interconnected intelligent temperature-controlled water supply tanks, and both ends of the cooling pipe are respectively connected to an intelligent temperature-controlled water supply tank.

[0015] In some preferred embodiments, the boundary constraint plate and the support block are magnetic, and the support block is magnetically adsorbed to the boundary constraint plate.

[0016] In some preferred embodiments, the boundary constraint plate is made of steel, and the support block is made of magnetic galvanized steel.

[0017] In some preferred embodiments, the bottoms of the side support blocks, the front support blocks, and the back support blocks are respectively connected to the test floor slab via screws;

[0018] The bottom support block is embedded between the side support block, the front support block and the back support block.

[0019] In some preferred embodiments, the bottom support block is a hollow structure, and the bottom support block is provided with data line through holes on the top and sides thereof, and the data line through holes on the top are sealed by a cover;

[0020] The temperature sensor, humidity sensor and strain sensor are respectively controlled and connected with an external data receiving device through data lines, and the data lines pass through the top data line through hole and the side data line through hole in turn and go out of the lining simulation cavity.

[0021] In some preferred embodiments, the cooling tube is made of PVC.

[0022] In some preferred embodiments, the water outlet and the water outlet are provided with filters.

[0023] In some preferred embodiments, the back support block is provided with a drain port at the bottom of its side surface for draining water from the water storage cavity.

[0024] An early temperature, humidity and strain test method for underground composite wall lining is implemented by the early temperature, humidity and strain test device mentioned above, and comprises the following steps:

[0025] (1) Select a specific number of support blocks according to the size of the composite wall lining, then arrange multiple side support blocks, multiple front support blocks and multiple back support blocks in a straight line on the test floor and fix them, then put the bottom support block between the side support blocks, front support blocks and back support blocks. The number of support blocks required depends on the size of the composite wall lining;

[0026] (2) According to the required constraint conditions, a boundary constraint plate with different protrusion densities and protrusion sizes is selected, and then the bonding surface of the boundary constraint plate is bonded to each support block, so that the boundary constraint plate encloses and forms an inner lining simulation cavity;

[0027] (3) Install the temperature sensor, humidity sensor and strain sensor in the fixed lining simulation cavity respectively and connect them to the external data receiving device for control;

[0028] (4) Prepare concrete according to the test requirements, then pour the concrete into the lining simulation cavity and fill the water tank with water;

[0029] (5) After waiting for the preset demolding time, remove the front support block and the boundary constraint plate attached thereto, and then lay the humidity control layer and the temperature control layer in sequence on the front of the composite wall lining, and finally connect the humidity control layer and the temperature control layer to the external data receiving device and set the required humidity conditions and temperature conditions respectively;

[0030] (6) The external data receiving device obtains the temperature, humidity and strain evolution laws of the composite wall lining under the set constraint conditions, humidity conditions and temperature conditions.

[0031] In some preferred embodiments, the following steps are further included before implementing step (4):

[0032] (7) Set the water temperature, flow rate and flow rate of the cooling pipe, fix the main body of the cooling pipe in the liner simulation cavity, then connect the two ends of the cooling pipe to an intelligent temperature-controlled water supply tank respectively, connect the two intelligent temperature-controlled water supply tanks to each other, and finally connect the intelligent temperature-controlled water supply tank to the external data receiving device for control;

[0033] There is no order of precedence for steps (3) and (7).

[0034] The present invention has at least the following beneficial effects:

[0035] The early temperature, humidity and strain test device and method for underground composite wall lining provided by the present invention can simulate and control the constraint conditions, ambient temperature and ambient humidity of the composite wall lining, and then strictly control the acquisition of the early age temperature, humidity and strain data and evolution law of the composite wall lining under a single variable, providing guidance and experience for the cracking and leakage control of the composite wall lining on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a top view of the early temperature, humidity and strain test device in Example 1 of the present invention, which includes a front support block and a boundary constraint plate attached thereto, and the temperature control layer and the humidity control layer are not installed;

[0037] Figure 2 for Figure 1 The cross-sectional view at A-A' in the figure, the water pipe is omitted;

[0038] Figure 3 It is a schematic diagram of the constraint surface of the boundary constraint plate affixed to the back support block in Example 1 of the present invention;

[0039] Figure 4 It is a right side view of the front support block in Example 1 of the present invention;

[0040] Figure 5 It is a right side view of a back support block and a boundary constraint plate, a cooling pipe fixing bracket and a monitoring component fixing bracket connected thereto in Example 1 of the present invention;

[0041] Figure 6 A top view of a back support block and a boundary constraint plate, a cooling pipe fixing bracket and a monitoring component fixing bracket connected thereto in Example 1 of the present invention;

[0042] Figure 7 Schematic diagram of the position of the cooling assembly and the liner simulation cavity in Example 1 of the present invention;

[0043] Figure 8 It is a top view of the early temperature, humidity and strain test device in Example 1 of the present invention, wherein the front support block and the boundary constraint plate attached thereto are removed and a temperature control layer and a humidity control layer are installed;

[0044] Fig. 9 for Figure 8 The cross-sectional view is taken at BB', with the water pipe omitted.

[0045] The reference numerals in the figure are: 1-boundary constraint plate, 110-protrusion, 120-water outlet, 2-front support block, 210-main body, 220-installation part, 221-screw hole, 222-screw, 3-back support block, 310-water storage chamber, 320-water outlet, 330-drainage outlet, 4-side support block, 5-bottom support block, 510-data cable through hole, 6-monitoring component, 7-monitoring component fixing bracket, 8-external data receiving device, 910-cooling pipe, 920-intelligent temperature control water supply tank, 930-water pipe, 10-cooling pipe fixing bracket, 111-humidity control layer, 112-temperature control layer, 12-concrete. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is further illustrated and described below through specific implementation methods.

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise clearly defined, directional words such as the use of terms such as "top", "bottom", "inside", "outside", "up", "down", "front", "back", "front" and "back" to indicate directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention. The direction from back to front herein is the direction from the back support block to the front support block, and the "front" side of each component is its "front" side. The direction from inside to outside herein is the direction away from the liner simulation cavity.

[0049] In the following, after the prepared concrete is poured into the lining simulation cavity, the concrete forms the composite wall lining. When describing the positional relationship and the functions of each component, the terms "concrete" and "composite wall lining" are equivalent.

[0050] Example 1

[0051] like Figure 1 and Figure 2 As shown, the early temperature, humidity and strain test device for underground composite wall lining provided in this embodiment includes a boundary constraint plate 1, a support block, a monitoring component 6, an external data receiving device 8, a cooling component, a temperature and humidity control component, a monitoring component fixing bracket 7 and two cooling pipe fixing brackets 10;

[0052] Among them, multiple boundary constraint plates 1 are in close contact and enclosed to form an inner lining simulation cavity with an upper opening, and concrete 12 is poured into the inner lining simulation cavity to form a composite wall inner lining. The boundary constraint plates 1 are in close contact to ensure that there is no gap between the front, back, bottom and two side surfaces of the inner lining simulation cavity, so that when pouring concrete 12, concrete 12 will not flow out from the intersection of each boundary constraint plate. The boundary constraint plate 1 has a relative fitting surface and a constraint surface, and the fitting surface is used to fit with the support block, wherein, as Figure 3 As shown, the constraint surface has a number of regular cubic protrusions 110 for simulating rough old concrete. By replacing the boundary constraint plate 1 with different protrusion densities and protrusion sizes, the interface between new and old concrete with different early constraint conditions can be simulated.

[0053] The support blocks include a front support block 2, a back support block 3, a side support block 4 and a bottom support block 5, which are respectively fitted with the boundary constraint plates 1 forming the front, back, side and bottom of the lining simulation cavity, and play a supporting role for the various components of the early temperature, humidity and strain test device. The number of support blocks and boundary constraint plates 1 can be selected as needed to achieve adjustable size of the lining simulation cavity. In this embodiment, the support blocks are made of galvanized steel with magnetism, which can effectively prevent rust. The boundary constraint plate 1 is made of steel, and the boundary constraint plate 1 is fitted with each support block by magnetic adsorption.

[0054] Figure 4 The specific structure of the front support block 2 is shown. It can be seen that the front support block 2 includes a main body 210 extending in the vertical direction and a mounting portion 220 extending in the horizontal direction. Among them, the longitudinal section of the main body 210 is a right-angled trapezoid, which can play a good supporting role. The mounting portion 220 is provided with a screw hole 221, and the front support block 2 is detachably fixed to the test floor through the screw hole 221 and the screw rod 222. The external structure of the side support block 4 and the back support block 3 is similar to that of the front support block 2, and will not be repeated below. The bottom support block 5 is embedded between the side support block 4, the front support block 2 and the back support block 3.

[0055] Furthermore, if Figure 5 and Figure 6 As shown, a hollow water storage chamber 310 is formed inside the back support block 3, and a plurality of regularly arranged water outlets 320 are provided on the side that is in contact with the boundary constraint plate 1, and a drainage outlet 330 is provided on the side bottom of the back support block 3. Figure 3 As shown, a plurality of water outlets 120 are provided at corresponding positions, and the water in the water storage cavity 310 can flow out from the water outlet 320 of the back support block 3 and the water outlet 120 of the boundary constraint plate 1, and contact with the concrete 12 in the lining simulation cavity and the composite wall lining formed by it, so as to simulate the influence of groundwater on the composite wall lining at an early age. Furthermore, a filter screen is provided on the water outlet 120 and the water outlet 320 to filter impurities in the water. After the test is completed, the excess water is discharged from the drain outlet 330. In this embodiment, the drain outlet 330 is a faucet.

[0056] One end of the monitoring component fixing bracket 7 is located in the liner simulation cavity and connected to the monitoring component 6 , and the other end passes through the boundary constraint plate 1 that fits the back support block 3 and is fixed on the back support block 3 .

[0057] One end of the cooling pipe fixing bracket 10 is arranged on the top of the back support block 3, and the other end extends horizontally to the top of the liner simulation cavity, which is used to clamp and fix the cooling pipe 910 of the cooling assembly.

[0058] Back to Figure 2 The interior of the bottom support block 5 is also a hollow structure for the data line connecting the monitoring assembly 6 and the external data receiving device 8 to pass through. Furthermore, the bottom support block 5 is provided with data line through holes 510 on its top and side. The data line through hole 510 located on the top of the bottom support block 5 has a cover (not shown in the figure). The cover seals the data line through hole 510 through which the data line passes. After the cover and the data line through hole 510 are covered, the bottom of the bottom support block 5 can still fit with the boundary constraint plate 1.

[0059] The monitoring component 6 includes a temperature sensor, a humidity sensor and a strain sensor which are connected to the external data receiving device 8 through a data line control, and the monitoring component 6 is fixed by a monitoring component fixing bracket 7. The monitoring component 6 is arranged in the lining simulation cavity through the monitoring component fixing bracket 7. When the lining simulation cavity is poured with concrete 12, the temperature sensor, the humidity sensor and the strain sensor are in the concrete 12 to monitor the temperature, humidity and strain data of the concrete 12 and transmit the data to the external data receiving device 8.

[0060] The cooling assembly includes a cooling pipe 910 and an intelligent temperature control water supply device. Figure 7 As shown, the intelligent temperature-controlled water supply equipment is two interconnected intelligent temperature-controlled water supply tanks 920. The cooling pipe 910 is a PVC pipe. The main body of the cooling pipe 910 is located in the lining simulation cavity, and its two ends are located above the lining simulation cavity and are clamped and fixed by a cooling pipe fixing bracket 10. The two intelligent temperature-controlled water supply tanks 920 are interconnected through a water pipe 930 and are respectively connected to one end of the cooling pipe 910 through the water pipe 930. The intelligent temperature-controlled water supply tank 920 monitors and adjusts the water temperature in the cooling pipe 910. The cooling pipe 910 and the two intelligent temperature-controlled water supply tanks 920 are connected in pairs to realize the circulation of cooling water. Due to the influence of the hydration of concrete 12, the newly poured wall will generate a large amount of hydration heat. The cooling component can take away the hydration heat through cooling water to achieve the purpose of reducing the peak temperature of the wall. When the test process does not involve the influence of the temperature drop effect of the cooling component on the lining of the composite wall, the device may not include the above-mentioned cooling component.

[0061] The temperature and humidity control component includes a humidity control layer 111 and a temperature control layer 112, which are respectively connected to the external data receiving device 8 for control. Figure 8 and Fig. 9As shown, after pouring concrete 12 into the lining simulation cavity and waiting for the preset demolding time, the front support block 2 and the boundary constraint plate 1 attached thereto are removed, and the temperature control layer 112, the humidity control layer 111 and the front of the concrete 12 are stacked in sequence, and the humidity control layer 111 is in direct contact with the concrete 12, and the humidity of the front of the composite wall lining is controlled by steam to simulate the ambient humidity under different environments and climates, and the maximum inner and outer humidity difference of the composite wall lining is calculated according to the humidity data collected by the humidity sensor; the temperature control layer 112 controls the temperature of the front of the composite wall lining through the heat conduction of the humidity control layer 111 to simulate the ambient temperature under different environments and climates, and the maximum inner and outer temperature difference of the composite wall lining is calculated according to the temperature data collected by the temperature sensor. Afterwards, the temperature control layer 112 and the humidity control layer 111 respectively transmit the collected data to the external data receiving device 8 for further integration and processing. It should be noted that the size of the temperature control layer 112 and the humidity control layer 111 should be able to completely cover the front surface of the concrete 12 to ensure that the entire front surface of the concrete 12 is in the external temperature and humidity environment simulated by the test.

[0062] Furthermore, in this embodiment, the temperature control layer 112 includes two layers of plastic covering films and a heating tube, the two layers of plastic covering films are stacked, and the heating tube is arranged between the two layers of plastic covering films. The heating tube heats, and then uses its thermal conductivity to transfer the temperature to the humidity control layer 111, and then transfers it to the surface of the laminated wall lining, thereby achieving temperature regulation of the surface of the laminated wall lining.

[0063] The two sides of the humidity control layer are tightly fitted with the composite wall lining and the temperature control layer respectively. The humidity control layer includes two layers of cotton covering films and water pipes. The two layers of cotton covering films are stacked and arranged. The water pipes are arranged between the two layers of cotton covering films. There are tiny holes on the water pipes. The humidity control layer can adjust the moisture content of the cotton covering film through the built-in water pipes, and then use the temperature conducted by the temperature control layer to evaporate the water on the cotton covering film, so as to achieve the purpose of adjusting the humidity of the humidity control layer and realize the adjustment of the humidity of the surface of the lining wall.

[0064] This embodiment also provides an early temperature, humidity and strain test method for underground composite wall lining, the specific steps are:

[0065] (1) The number of supporting blocks of the composite wall lining model is selected according to the length of the composite wall lining of the test design. In this embodiment, five front supporting blocks 2, five back supporting blocks 3, one side supporting block 4 arranged on the left, one side supporting block 4 arranged on the right and five bottom supporting blocks 5 are used. The five front supporting blocks 2 are arranged in a straight line, and the five back supporting blocks 3 are arranged in a straight line. The front supporting blocks 2 and the back supporting blocks 3 are arranged opposite to each other. One side supporting block 4 is arranged on the left and right sides of the front supporting blocks 2 and the back supporting blocks 3 respectively. The bottom supporting block 5 is located between the front supporting block 2 and the back supporting block 3. The screw 222 is passed through the screw hole 221 at the bottom of the supporting block to fix the front supporting block 2, the back supporting block 3 and the side supporting block 4 on the test floor in the test room. Finally, the bottom supporting block 5 is laid between the front supporting block 2, the back supporting block 3 and the side supporting block 4 to complete the installation of the supporting blocks.

[0066] (2) According to the degree of constraint in the composite wall set in the test, a boundary constraint plate 1 with a specific protrusion density and protrusion size is selected, and the bonding surface of the boundary constraint plate 1 is bonded to the inner surface of the support block by utilizing the magnetism of the boundary constraint plate 1, so that the boundary constraint plate 1 encloses a simulated lining cavity.

[0067] (3) Set the water temperature, flow rate and flow rate of the cooling pipe 910, then use two cooling pipe fixing brackets 10 to clamp the two ends of the cooling pipe 910 respectively, put the main body of the cooling pipe 910 into the liner simulation cavity and fix the cooling pipe fixing bracket 10 to the top of the back support block 3, then connect the two ends of the cooling pipe 910 to an intelligent temperature-controlled water supply tank 920 through a water pipe 930 respectively, and connect the two intelligent temperature-controlled water supply tanks 920 with the water pipe 930, and finally connect the intelligent temperature-controlled water supply tank 920 to the external data receiving device 8 for control.

[0068] (4) Fix the monitoring component (including the temperature sensor, humidity sensor and strain sensor) on the monitoring component fixing bracket, then pass the monitoring component fixing bracket through the boundary constraint plate 1 and fix it on the back support block 3, open the cover on the bottom support block 5, lead out the data line connected to the temperature sensor, humidity sensor and strain sensor from the hollow channel inside the bottom support block 5, cover the cover on the bottom support block 5, ensure that the boundary constraint plate 1 is in close contact with the bottom support block 5, and connect the data line to the external data receiving device 8.

[0069] (5) Turn on the power of the intelligent temperature control water supply tank 920 and the power of the external data receiving device 8 to ensure that the water in the cooling pipe 910 flows normally and the sensor works normally.

[0070] (6) Prepare concrete 12 according to the test requirements, pour the mixed concrete 12 into the lining simulation cavity, and fill the water storage cavity 310 of the back support block 3 with water.

[0071] (7) After waiting for the preset demolding time, remove the front support block 2 and the boundary constraint plate 1 attached thereto, connect the temperature and humidity control component, first lay the humidity control layer 111, then lay the temperature control layer 112, and finally connect the temperature control layer 112 and the humidity control layer 111 to the external data receiving device 8 respectively, and set the corresponding temperature and humidity according to the simulated ambient temperature and humidity.

[0072] (7) The external data receiving device 8 obtains the temperature, humidity and strain evolution law of the composite wall lining under the set constraint conditions, humidity conditions and temperature conditions.

[0073] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. An early temperature, humidity and strain test device for underground composite wall lining, arranged on a test floor, characterized in that: It includes boundary constraint plates, support blocks, monitoring components, temperature and humidity control components and external data receiving devices; The boundary constraint plate has a relative constraint surface and a fitting surface, the constraint surface has a plurality of protrusions, a plurality of the boundary constraint plates are in close contact and enclose to form an inner lining simulation cavity with an upper opening, the constraint surface is the inner wall of the inner lining simulation cavity, and concrete is poured into the inner lining simulation cavity to form a composite wall lining; The support blocks include at least two side support blocks, at least one front support block, at least one back support block and at least one bottom support block which are respectively detachably fixed on the test floor slab, and the side support blocks, the front support blocks, the back support blocks and the bottom support blocks are respectively detachably attached to the attachment surfaces of the boundary constraint plates forming the side, front, back and bottom surfaces of the liner simulation cavity; Wherein, a hollow water storage cavity is formed inside the back support block and a plurality of water outlets are provided on the side thereof in contact with the boundary constraint plate, and a water outlet hole is also provided at the corresponding position of the boundary constraint plate on the back side, so that the water in the water storage cavity can flow through the water outlet of the back support block and the water outlet hole of the boundary constraint plate in sequence into the lining simulation cavity; the front support block and the boundary constraint plate in contact with it are removed after the composite wall lining is formed; The monitoring component comprises a temperature sensor, a humidity sensor and a strain sensor arranged in the liner simulation cavity, and the temperature sensor, the humidity sensor and the strain sensor are respectively control-connected to the external data receiving device; The temperature and humidity control component includes a temperature control layer and a humidity control layer. The temperature control layer, the humidity control layer and the front side of the composite wall lining are overlapped in sequence, and the temperature control layer and the humidity control layer are respectively controlled and connected to the external data receiving device; the humidity control layer performs humidity control on the front side of the composite wall lining and calculates the maximum inner and outer humidity difference of the composite wall lining according to the humidity data collected by the humidity sensor; the temperature control layer performs temperature control on the front side of the composite wall lining and calculates the maximum inner and outer temperature difference of the composite wall lining according to the temperature data collected by the temperature sensor.

2. The early temperature, humidity and strain testing device according to claim 1, characterized in that: It also includes a cooling component, which includes a cooling pipe and an intelligent temperature control water supply device. The main body of the cooling pipe is arranged in the lining simulation cavity. The two ends of the cooling pipe are located above the lining simulation cavity and are respectively connected to the intelligent temperature control water supply device. The intelligent temperature control water supply device is controlled and connected to the external data receiving device.

3. The early temperature, humidity and strain testing device according to claim 2, characterized in that: The intelligent temperature-controlled water supply equipment comprises two interconnected intelligent temperature-controlled water supply tanks, and both ends of the cooling pipe are respectively connected to one of the intelligent temperature-controlled water supply tanks.

4. The early temperature, humidity and strain testing device according to claim 1, characterized in that: The boundary constraint plate and the support block are magnetic, and the support block is magnetically adsorbed to the boundary constraint plate.

5. The early temperature, humidity and strain testing device according to claim 4, characterized in that: The material of the boundary constraint plate is steel, and the material of the support block is magnetic galvanized steel.

6. The early temperature, humidity and strain testing device according to claim 1, characterized in that: The bottoms of the side support blocks, the front support blocks and the back support blocks are respectively connected to the test floor slab via screws; The bottom support block is embedded between the side support block, the front support block and the back support block.

7. The early temperature, humidity and strain testing device according to claim 1, characterized in that: The bottom support block is a hollow structure, and the bottom support block is provided with data line through holes on the top and side thereof, and the data line through holes on the top are sealed by a cover; The temperature sensor, the humidity sensor and the strain sensor are respectively controlled and connected with the external data receiving device through data lines, and the data lines pass through the data line through holes at the top and the data line through holes at the side in sequence and then pass out of the lining simulation cavity.

8. An early temperature, humidity and strain test method for underground composite wall lining, characterized in that: The method is implemented by the early temperature, humidity and strain test device according to any one of claims 1 to 7, which comprises the following steps: (1) Select a specific number of support blocks according to the size of the composite wall lining, then arrange a plurality of side support blocks, a plurality of front support blocks and a plurality of back support blocks in a straight line on the test floor slab and fix them, and then place the bottom support block between the side support blocks, the front support blocks and the back support blocks. The number of support blocks required depends on the size of the composite wall lining; (2) selecting a boundary constraint plate with different protrusion densities and protrusion sizes according to the required constraint conditions, and then fitting the bonding surface of the boundary constraint plate to each support block, so that the boundary constraint plate encloses and forms an inner lining simulation cavity; (3) Install the temperature sensor, humidity sensor and strain sensor in the fixed lining simulation cavity respectively and connect them to the external data receiving device for control; (4) preparing concrete according to test requirements, then pouring the concrete into the lining simulation cavity, and filling the water tank with water; (5) After waiting for the preset demolding time, the front support block and the boundary constraint plate attached thereto are removed, and then the humidity control layer and the temperature control layer are laid in sequence on the front of the composite wall lining, and finally the humidity control layer and the temperature control layer are respectively connected to the external data receiving device for control and setting the required humidity conditions and temperature conditions; (6) The external data receiving device obtains the temperature, humidity and strain evolution law of the composite wall lining under the set constraint conditions, humidity conditions and temperature conditions.

9. The early temperature, humidity and strain test method according to claim 8, characterized in that: Before implementing the step (4), the following steps are also included: (7) Setting the water temperature, flow rate and flow rate of the cooling pipe, fixing the main body of the cooling pipe in the liner simulation cavity, and then connecting the two ends of the cooling pipe to an intelligent temperature control water supply tank respectively, connecting the two intelligent temperature control water supply tanks to each other, and finally connecting the intelligent temperature control water supply tank to the external data receiving device for control; There is no order of precedence for step (3) and step (7).

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