Communication channel excavation test device, system and method

Abstract

The present invention discloses a connecting channel excavation test device, system and method. It has grooves at both axial ends of the channel body and movably installed with multiple circumferentially distributed telescopic parts. Grooves are respectively provided on the upper wall and lower wall of the two relatively openings of the simulated main tunnels and movably installed with matching second inner liner and third inner liner. When testing, the connecting channel excavation test device of the present invention can change the axial height and length of the simulated connecting channel by adjusting the axial extension of the telescopic parts and the circumferential position of the second inner liner and the third inner liner to meet the simulation requirements of different working conditions. It has good versatility and the corresponding production cost and test cost are low. In addition, the present invention can simulate the soil rebound phenomenon during the excavation construction process of the connecting channel by discharging the fluid in the support bag, thereby more accurately simulating the excavation construction process of the connecting channel.

Description

Technical Field

[0001] The present invention relates to the technical field of communication channel construction testing, and in particular to a communication channel excavation testing device, system and method. Background Art

[0002] A connecting channel is a channel set up between two main tunnels (such as subway tunnels, highway tunnels, pipeline corridors, or deep-buried drainage tunnels, etc.) and connecting the two main tunnels. It is usually built together with a collection and drainage pump station, and together they play the role of connecting, collecting, draining, repairing and fire rescue the two main tunnels.

[0003] Connecting tunnels are typically constructed using shield tunneling. To minimize earthwork excavation and enhance construction safety, they are typically excavated at the minimum spacing between the two main tunnels, typically between the centers of the two main tunnels. However, due to the complexity of actual engineering geology, such as the presence of isolated boulders and unfavorable geology, constructing a connecting tunnel in the center of the tunnel is not necessarily the safest option. In such cases, the connecting tunnel's axis height and length may need to be adjusted. Improper handling can lead to major engineering accidents. Simulation tests are often used to determine the optimal axis height and length for connecting tunnels under different operating conditions.

[0004] However, the length of the connecting channel model of the current connecting channel excavation test device and its relative position to the two main tunnel models are fixed. Each set of test devices can only simulate one axial height and length of the connecting channel 1. Therefore, it is necessary to produce multiple sets of test devices to simulate different axial heights and lengths of the connecting channel 1. Obviously, this type of test device is not universal, and the corresponding production and testing costs are high.

[0005] Furthermore, in actual engineering, the upper soil of the unexcavated layer exerts pressure on the lower soil, compressing the lower soil due to the pressure from above. During the excavation of the connecting channel, when the upper soil in the forward direction of excavation is first excavated, the channel lining at that location is ready for installation. At this point, the pressure exerted by the upper soil on the lower soil at that location disappears, resulting in excavation unloading. This is like a compressed spring with the compression force removed, causing the soil to rebound, tending to return to its original shape. However, existing connecting channel excavation tests cannot simulate this excavation unloading phenomenon. Summary of the Invention

[0006] The main purpose of the present invention is to propose a connecting channel excavation test device, a test system and a test method, which aim to meet the test requirements of different working conditions while reducing the production and testing costs.

[0007] To achieve the above-mentioned purpose, the present invention proposes a communication channel excavation test device, comprising:

[0008] The simulated communication channel includes a tubular channel body, with receiving grooves formed at the two axial end surfaces of the channel body, a first liner movably inserted into the receiving groove, and a plurality of annularly distributed telescopic members, each of which is movable along the axial direction of the receiving groove;

[0009] a first locking mechanism, for locking the telescopic member to the channel body;

[0010] Two simulated main tunnels are arranged side by side, and the areas opposite to each other of the two simulated main tunnels are respectively formed with openings for the first inner liner to extend therethrough, the upper walls of the openings are formed with a first receiving groove extending circumferentially, and the lower walls of the openings are formed with a second receiving groove extending circumferentially, the first receiving groove being movably mounted with a second inner liner that can slide circumferentially along the first receiving groove, and the second receiving groove being movably mounted with a third inner liner that cooperates with the second inner liner and can slide circumferentially along the second receiving groove, and the second and third inner liner can slide between positions against or separated from the first inner liner;

[0011] a second locking mechanism, for locking the second liner to the simulated main tunnel; and

[0012] The third locking mechanism is used to lock the third inner liner in the simulated main tunnel.

[0013] The present invention further proposes a communication channel excavation test system, comprising:

[0014] A model box, wherein the model box is used to contain the test soil;

[0015] An excavation test device, which is the aforementioned communication channel excavation test device and can be buried in the test soil;

[0016] a support bladder, which is disposed in the simulated communication channel and supports the inner wall of the simulated communication channel when a fluid of predetermined pressure is injected into the support bladder; and

[0017] A monitoring system is used to obtain deformation and / or displacement data of the required simulated communication channel.

[0018] The present invention also proposes a communication channel excavation test method, comprising the following steps:

[0019] S1. Adjust the axial extension of the telescopic member and the circumferential positions of the second and third inner liner according to the test conditions and requirements, so that the second and third inner liner fit together and abut against the telescopic member extending into the opening, and complete the connection operation of the excavation test device;

[0020] S2. Injecting a fluid of predetermined pressure into the support bladder so that the support bladder supports the simulated communication channel;

[0021] S3. burying the excavated test device in the test soil and compacting it;

[0022] S4, draining the fluid in the support bag to simulate the excavation unloading phenomenon when excavating the construction communication channel;

[0023] S5. Acquire deformation and / or displacement data of the simulated communication channel through the monitoring system.

[0024] The connecting channel excavation test device of the present invention is grooved at both axial ends of the channel body and movably installed with multiple circumferentially distributed telescopic parts. Grooves are respectively provided on the upper and lower walls of the two relatively open simulated main tunnels and movably installed with matching second and third inner liners. When the connecting channel excavation test device of the present invention is tested, the axial height and length of the simulated connecting channel can be changed by adjusting the axial extension of the telescopic parts and the circumferential position of the second and third inner liners, thereby meeting the simulation requirements of different working conditions, having good versatility, and corresponding low production and testing costs. In addition, the connecting channel excavation test system of the present invention is provided with a support bladder inside the simulated connecting channel. When the support bladder is filled with a predetermined pressure or a predetermined amount of fluid, the support bladder can simulate unexcavated soil and form support for the inner wall of the simulated connecting channel, and at the same time can compress the soil below through the simulated connecting channel. After the fluid in the support bag is discharged, the support bag no longer provides support for the simulated connecting channel, nor does it compress the soil below through the simulated connecting channel, causing the soil below to have a tendency to recover elastically, thereby simulating the soil rebound phenomenon during the excavation construction process of the connecting channel, and thus more accurately simulating the excavation construction process of the connecting channel, providing more accurate reference data for determining the optimal axial height and length of the connecting channel under different working conditions during the actual construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the connecting channel excavation test device of the present invention when the simulated connecting channel is at the lower limit position;

[0026] Figure 2 This is a schematic diagram of the connecting channel excavation test device of the present invention when the simulated connecting channel is in the middle position;

[0027] Figure 3 This is a schematic diagram of the connecting channel excavation test device of the present invention when the simulated connecting channel is at the upper limit position;

[0028] Figure 4 This is a schematic diagram of the coordination between the first inner liner, the second inner liner, and the third inner liner of the communication channel excavation test device of the present invention;

[0029] Figure 5 An axial diagram of a simulated communication channel of the present invention;

[0030] Figure 6 It is a schematic diagram of the coordination of two adjacent telescopic members in the annular direction;

[0031] Figure 7 Schematic diagram of the connecting channel excavation test system of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides a communication channel excavation test device.

[0036] In the embodiment of the present invention, Figures 1 to 7 As shown, the connecting channel excavation test device includes a simulated connecting channel 1, a first locking mechanism, two simulated main tunnels 2 arranged side by side, a second locking mechanism and a third locking mechanism.

[0037] Among them, the simulated communication channel 1 includes a tubular channel body 10, and a receiving groove 11 is formed at the two axial end faces of the channel body 10 respectively. A first inner liner 12 is movably inserted in the receiving groove 11. The first inner liner 12 is tubular as a whole, and includes a plurality of annularly distributed telescopic parts 121. Each telescopic part 121 can move axially along the receiving groove 11. Two circumferentially adjacent telescopic parts 121 are directly attached to each other or separated by a partition 122 to form a tubular overall structure. The first locking mechanism is used to lock the telescopic part 121 to the channel body 10 to prevent the telescopic part 121 from having abnormal axial movement. The opposite areas of the two simulated main tunnels 2 are respectively formed with openings 20 for the first inner liner 12 to extend into. The upper wall of the opening 20 is formed with a first receiving groove 21a extending circumferentially, and the lower wall of the opening 20 is formed with a second receiving groove 21b extending circumferentially. There may be a certain interval between the circumferential extension ends of the first receiving groove 21a and the second receiving groove 21b (such as Figure 1 (as shown in the figure) or are connected to form an integral body. The first receiving groove 21a is movably installed with a second inner liner 22a that can slide circumferentially along the first receiving groove 21a, and the second receiving groove 21b is movably installed with a third inner liner 22b that cooperates with the second inner liner 22a and can slide circumferentially along the second receiving groove 21b. The second inner liner 22a and the third inner liner 22b can slide between positions that are against or separated from the first inner liner 12. The second locking mechanism is used to lock the second inner liner 22a to the simulated main tunnel 2 to prevent the second inner liner 22a from sliding abnormally in the circumferential direction; the third locking mechanism is used to lock the third inner liner 22b to the simulated main tunnel 2 to prevent the third inner liner 22b from sliding abnormally in the circumferential direction. During the test, the connecting channel excavation test device of the present invention can change the axial height and length of the simulated connecting channel 1 by adjusting the axial extension of the telescopic member 121 and the circumferential position of the second inner liner 22a and the third inner liner 22b, thereby meeting the simulation requirements of different working conditions, having good versatility, and corresponding low production cost and test cost.

[0038] It should be noted that when the second liner 22a and the third liner 22b are matched and abut against the first liner 12 that partially extends into the opening 20, if there is a local gap at the junction of the first liner 12 and the second liner 22a and the third liner 22b or at the matching place of the second liner 22a and the third liner 22b, the local gap can be filled to form a sealing support body 100 with high strength (see Figure 4 ), which, on the one hand, prevents liquids or sand from entering the simulated connecting channel 1 and / or the simulated main tunnel 2, and, on the other hand, improves the bonding strength and uniformity of the joints and / or fittings, thereby ensuring relatively uniform forces between the first liner 12, the second liner 22a, and the third liner 22b. Specifically, the sealing support 100 is primarily formed by filling and solidifying cement slurry, structural adhesive, concrete, or crack grouting material.

[0039] In order to further ensure the waterproofness of the junction of the simulated communication channel 1 and the simulated main tunnel 2, geotextile (not shown) can be covered at least at the junction of the simulated communication channel 1 and the simulated main tunnel 2.

[0040] In one embodiment of the present invention, two circumferentially adjacent telescopic members are directly or indirectly sealed against each other and are capable of relative axial movement. Furthermore, to prevent water or sand from entering the interior of the simulated communication channel 1, the contact surfaces of the two circumferentially adjacent telescopic members 121 are provided with a waterproof layer (not shown). The waterproof layer can be made of materials such as rubber or silicone and can be embedded, bonded, or coated on the contact surfaces of the telescopic members 121.

[0041] Specifically, if Figure 6 As shown, each telescopic member 121 has a circumferentially extending tenon 1211 on one circumferential side and a slot 1212 corresponding to the tenon 1211 on the other circumferential side. Two circumferentially adjacent telescopic members 121 are connected to each other through the cooperation between the tenon 1211 and the slot 1212, and can move axially relative to each other to adjust the extension. Preferably, the tenon 1211 has a T-shaped or T-like structure, and the slot 1212 has a corresponding T-shaped or T-like cross-section. This connection method can improve the overall structural strength of the first inner liner 12.

[0042] In another embodiment of the present invention, a separator 122 is further provided between two adjacent telescopic members 121. The separator 122 is also movably inserted into the receiving groove 11 and can move axially along the receiving groove 11 to adjust the extension. The mating surfaces of the telescopic members 121 and the separator 122 are also sealed.

[0043] It is understandable that the number of the telescopic members 121 can be set according to demand, and can generally be 10 to 50, preferably 20 to 30, and more preferably 24 to 26.

[0044] The telescopic member 121 is made of a relatively high-strength material, such as metal, alloy, polymer material or carbon fiber, preferably stainless steel. Meanwhile, the separator 122 can also be made of a relatively high-strength material, such as metal, alloy, polymer material or carbon fiber, preferably stainless steel.

[0045] In some embodiments of the present invention, Figure 5 As shown, the annular dimension of the telescopic member 121 is larger than the annular dimension of the partition 122 , and can generally be 2 to 8 times, preferably 3 to 5 times, the annular dimension of the partition 122 .

[0046] In the embodiment of the present invention, the first locking mechanism can have multiple implementation modes. In one embodiment, for example, Figure 2As shown, the first locking mechanism includes at least one first screw hole (not shown) formed on the inner wall and / or outer wall of the channel body 10 (preferably formed on the inner wall of the channel body 10) corresponding to each telescopic member 121, and a first screw rod 200 that cooperates with the first screw hole. After adjusting the extension of the telescopic member 121, the first screw rod 200 at the corresponding first screw hole is screwed in until it abuts against the telescopic member 121 to achieve the locking of the telescopic member 121. It can be understood that the number and specific positions of the first screw holes corresponding to each telescopic member 121 can be determined according to needs. Generally speaking, a greater number of first screw holes will provide a better locking effect, but the cost will be higher.

[0047] In another embodiment of the present invention, the first locking mechanism includes an axial sliding groove (not shown) formed on the inner wall and / or outer wall of the channel main body 10 (preferably formed on the inner wall of the channel main body 10) corresponding to each telescopic member 121, a first screw portion (not shown) provided on the telescopic member 121 and extending outward from the sliding groove, and a first nut (not shown) matched with the first screw portion. After adjusting the extension of the telescopic member 121, the first nut is screwed along the first screw portion until it abuts against the channel main body 10 to achieve the locking of the telescopic member 121.

[0048] It is understandable that, if the test requires, a locking mechanism may be provided to lock the partition 122 to the channel body 10. The locking mechanism may refer to the implementation of the first locking mechanism and will not be described in detail here.

[0049] In some embodiments of the present invention, the second inner liner 22a includes a plurality of axially distributed first pressure members 22a1, and the plurality of first pressure members 22a1 are all arc-shaped rod-shaped structures that are compatible with the first receiving groove 21a, and fill the entire first receiving groove 21a in the axial direction, and can slide circumferentially along the first receiving groove 21a. When the simulated communication channel 1 and the simulated main tunnel 2 are assembled, the first pressure member 22a1 opposite to the simulated communication channel 1 is abutted against the simulated communication channel 1, and the first pressure member 22a1 misaligned with the simulated communication channel 1 is abutted against the third inner liner 22b.

[0050] It is understood that the number of first pressure members 22a1 can be determined based on test requirements, and can generally be 10 to 50, preferably 20 to 30, and more preferably 22 to 26. Generally speaking, the greater the number, the greater the total contact surface between the first pressure members 22a1 and the simulated communication channel 1, and the smaller the gap between the simulated main tunnel 2 and the simulated communication channel 1.

[0051] It is understood that the circumferential and axial dimensions of opening 20 are generally determined based on test requirements, preferably taking into account both test versatility and structural stability. Generally speaking, the circumferential dimension of opening 20 can be 0.25 to 0.5 times the circumference of the simulated main tunnel 2, preferably 0.3 to 0.4 times, which effectively meets the test versatility and structural stability requirements. The axial dimension of opening 20 can generally be 1 to 3 times the diameter of the simulated connecting channel 1, preferably 1.5 to 2 times.

[0052] In some embodiments of the present invention, multiple axially adjacent first pressure members 22a1 are directly or indirectly sealed against each other and can slide circumferentially relative to each other. Furthermore, to prevent water or sand from entering the simulated main tunnel 2, a waterproof layer (not shown) can be provided between the contact surfaces of two axially adjacent first pressure members 22a1. Similarly, the waterproof layer can be made of materials such as rubber or silicone and can be embedded, bonded, or coated on the contact surfaces of the first pressure members 22a1.

[0053] In an embodiment of the present invention, in order to improve the overall strength of the second inner liner 22a, two axially adjacent first pressing members 22a1 can also be connected by the cooperation of tongues and grooves. For details, please refer to the connection method between the telescopic members 121, which will not be repeated here.

[0054] In the embodiment of the present invention, the first pressing member 22a1 and the second pressing member 22b1 can be made of relatively high-strength materials, such as metal, alloy, polymer material or carbon fiber, and are preferably made of stainless steel.

[0055] It is understandable that the second locking mechanism and the third locking mechanism also have multiple implementations, such as the same or similar implementations as the first locking mechanism. The specific implementations of the second locking mechanism and the third locking mechanism will not be repeated here.

[0056] Similarly, in some embodiments of the present invention, the third inner liner 22b can adopt the same implementation as the second inner liner 22a, that is, it includes multiple axially distributed second pressure members 22b1, and the multiple second pressure members 22b1 are all arc-shaped rod structures suitable for the second receiving groove 21b, which will not be repeated here.

[0057] It can be understood that the materials of the simulated connecting channel 1 and the simulated main tunnel 2 can be selected and used according to the working conditions in the actual project and in combination with their parameters and a certain similarity ratio, which will not be elaborated here.

[0058] After introducing the embodiment of the connecting channel excavation test device of the present invention, the embodiment of the test system having the connecting channel excavation test device will be introduced next. The specific structure of the connecting channel excavation test device is shown in the above embodiment, and the repeated parts are not repeated here.

[0059] like Figures 1 to 7 As shown, the connecting channel excavation test system includes a model box 4, an excavation test device, a support capsule 3 and a monitoring system (not shown). Among them, the model box 4 is used to contain the test soil 41. The model box 4 is a prior art and is well known to those skilled in the art. For example, a square box structure with an open top can be adopted. Its specific structure will not be described in detail here. The excavation test device is the above-mentioned connecting channel excavation test device, which can be buried in the test soil inside the model box 4. The specific structure of the excavation test device can be found in the above-mentioned embodiment and will not be described in detail here. The support capsule 3 is arranged in the simulated connecting channel 1 of the excavation test device. When a predetermined pressure or a predetermined amount of fluid 31 is injected into the interior of the support capsule 3, support can be formed on the inner wall of the simulated connecting channel 1; the monitoring system is used to obtain the required deformation and / or displacement data of the simulated connecting channel 1 for research and analysis. As for how to analyze specifically, the existing technology can be used and will not be described in detail here. During testing, the connecting channel excavation test system of the present invention can change the axial height and length of the simulated connecting channel 1 by adjusting the axial extension of the telescopic member 121 and the circumferential position of the second inner liner 22a and the third inner liner 22b, thereby meeting the simulation requirements of different working conditions. It has good versatility and correspondingly low production and testing costs. In addition, the connecting channel excavation test system of the present invention is provided with a support bladder 3 inside the simulated connecting channel 1. When the support bladder 3 is filled with a fluid 31 of a predetermined pressure or a predetermined amount, the support bladder 3 can simulate unexcavated soil and form support for the inner wall of the simulated connecting channel 1. At the same time, the simulated connecting channel 1 can compress the soil below. After the fluid 31 in the support bag 3 is discharged, the support bag 3 no longer provides support for the simulated connecting channel 1, nor does it compress the soil below through the simulated connecting channel 1, causing the soil below to have a tendency to recover elastically, thereby simulating the soil rebound phenomenon during the excavation construction process of the connecting channel, and thus more accurately simulating the excavation construction process of the connecting channel, providing more accurate reference data for research in determining the optimal axial height and length of the connecting channel under different working conditions during the actual construction process.

[0060] It should be noted that when the second liner 22a and the third liner 22b are matched and abut against the first liner 12 that partially extends into the opening 20, if there is a local gap between the junction of the first liner 12 and the second liner 22a and the third liner 22b or the junction of the second liner 22a and the third liner 22b, a sealing support body 100 with high strength can be filled in the local gap to prevent liquid or sand from entering the simulated connecting channel 1 and / or the simulated main tunnel 2. On the other hand, it can improve the bonding strength and uniformity of the bonding and / or matching at the junction and / or matching, so that the force between the first liner 12, the second liner 22a and the third liner 22b is relatively uniform. Specifically, the support body is mainly formed by filling and solidifying cement slurry, structural adhesive, concrete or crack grouting material.

[0061] In the embodiment of the present invention, the support bladder 3 is made of soft waterproof material, such as rubber membrane, nylon fabric, Oxford fabric or sheepskin, etc. The support bladder 3 has an interface connecting the inner and outer spaces, so that fluid 31 can be input or discharged through the interface.

[0062] It can be understood that the monitoring system described in the present invention is a prior art, generally including a data acquisition device (not shown), and at least one of the detection instruments such as a strain gauge (not shown), a stress sensor (not shown), and a surface monitor (not shown), and is mainly used to obtain at least one of the horizontal and vertical displacements of the simulated connecting channel 1, and the stress and strain data at the connection between the simulated connecting channel 1 and the simulated main tunnel 2. As for the specific structure, setting method and working principle of the above-mentioned data acquisition device and detection instrument, they are already well known to technicians in the field and will not be repeated here.

[0063] After introducing the embodiment of the connecting channel excavation test system of the present invention, the embodiment of the test method using the connecting channel excavation test system will be introduced. The specific structure of the connecting channel excavation test system is shown in the above embodiment, and the repeated parts are not repeated here.

[0064] like Figures 1 to 7 As shown, the connecting channel excavation test method includes the following steps:

[0065] S1. According to the test conditions and requirements, adjust the axial extension of the telescopic member 121 and the circumferential position of the second inner liner 22a and the third inner liner 22b so that the second inner liner 22a and the third inner liner 22b cooperate with each other and offset against the telescopic member 121 extending into the opening 20, so that the simulated communication channel 1 is at the axial height required for the test and the connection operation of the excavation test device is completed.

[0066] It can be understood that in step S1, when the second inner liner 22a and the third inner liner 22b are matched and abutted against the first inner liner 12 that partially extends into the opening 20, if there is a local gap at the junction of the first inner liner 12 and the second inner liner 22a and the third inner liner 22b or the matching place of the second inner liner 22a and the third inner liner 22b, it also includes a process of filling the local gap to form a sealing support body 100 with higher strength. On the one hand, it can prevent liquid or sand from entering the simulated connecting channel 1 and / or the simulated main tunnel, and on the other hand, it can improve the bonding strength and uniformity of the junction and / or matching place, so that the force between the first inner liner 12, the second inner liner 22a and the third inner liner 22b is relatively uniform.

[0067] Specifically, the sealing support body 100 is mainly formed by filling and solidifying cement slurry, structural adhesive, concrete or crack grouting material.

[0068] S2 . Inject a fluid 31 with a predetermined pressure or a predetermined amount into the support capsule 3 , so that the support capsule 3 supports the simulated communication channel 1 .

[0069] Specifically, the fluid 31 can be a "single-phase flow" such as gas or liquid (e.g., water), or a "two-phase flow" of liquid + solid particles or gas + solid particles. After the fluid 31 is injected at a predetermined pressure or in a predetermined amount, the support bladder 3 can simulate the unexcavated soil above.

[0070] S3. Bury the excavated test device in the test soil and compact it.

[0071] In an embodiment of the present invention, the process of burying the excavation test device in the test soil and compacting it preferably involves pre-adding and compacting a predetermined thickness of test soil, then placing the excavation test device on the predetermined thickness of test soil; and then continuing to add and compact the test soil in layers until the excavation test device is completely buried. It is understood that the preparation of the test soil is conventional and will not be further described here.

[0072] S4. The fluid 31 in the support bag 3 is discharged to simulate the excavation unloading phenomenon when excavating the construction communication channel.

[0073] In the embodiment of the present invention, the support bladder 3 is made of soft waterproof material, such as rubber membrane, nylon fabric, Oxford fabric or sheepskin, etc. The support bladder 3 has an interface connecting the inner and outer spaces, so that fluid 31 can be input or discharged through the interface.

[0074] S5. Obtain deformation and / or displacement data of the simulated communication channel 1 through the monitoring system.

[0075] During the test of the communication channel excavation test method of the present invention, the axial height and length of the simulated communication channel 1 can be changed by adjusting the axial extension of the telescopic member 121 and the circumferential position of the second inner liner 22a and the third inner liner 22b, thereby meeting the simulation requirements of different working conditions, having good versatility, and correspondingly low production and testing costs. In addition, the communication channel excavation test method of the present invention is provided with a support bladder 3 inside the simulated communication channel 1. When the support bladder 3 is filled with a fluid 31 of a predetermined pressure, the support bladder 3 can simulate unexcavated soil and form support for the inner wall of the simulated communication channel 1, and at the same time can compress the soil below through the simulated communication channel 1. After the fluid 31 in the support bag 3 is discharged, the support bag 3 no longer provides support for the simulated communication channel 1, nor does it compress the soil below through the simulated communication channel 1, causing the soil below to have a tendency to recover elastically, thereby simulating the soil rebound phenomenon during the excavation construction process of the communication channel 1, and thus more accurately simulating the excavation construction process of the communication channel 1, providing more accurate reference data for determining the optimal axial height and length of the communication channel under different working conditions during the actual construction process.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The connecting channel excavation test device is characterized by: include: The simulated communication channel includes a tubular channel body, with receiving grooves formed at the two axial end surfaces of the channel body, a first liner movably inserted into the receiving groove, and a plurality of annularly distributed telescopic members, each of which is movable along the axial direction of the receiving groove; a first locking mechanism, for locking the telescopic member to the channel body; Two simulated main tunnels are arranged side by side, and the areas opposite to each other of the two simulated main tunnels are respectively formed with openings for the first inner liner to extend into, the upper wall of the opening is formed with a first receiving groove extending circumferentially, and the lower wall of the opening is formed with a second receiving groove extending circumferentially, the first receiving groove is movably mounted with a second inner liner that can slide circumferentially along the first receiving groove, and the second receiving groove is movably mounted with a third inner liner that cooperates with the second inner liner and can slide circumferentially along the second receiving groove, the second inner liner and the third inner liner can slide between positions against or separated from the first inner liner, and the axial height and length of the simulated communication channel can be changed by adjusting the axial extension of the telescopic member and the circumferential position of the second inner liner and the third inner liner; a second locking mechanism for locking the second liner to the simulated main tunnel; as well as The third locking mechanism is used to lock the third inner liner in the simulated main tunnel.

2. The communication channel excavation test device according to claim 1, characterized in that: The contact surfaces of two circumferentially adjacent telescopic members are provided with a waterproof layer.

3. The communication channel excavation test device according to claim 1, characterized in that: A circumferentially extending tenon is provided on one circumferential side of each telescopic member, and a slot corresponding to the tenon is provided on the other circumferential side. Two circumferentially adjacent telescopic members are mutually clamped through the cooperation of the tenon and the slot.

4. The communication channel excavation test device according to claim 1, characterized in that: A separator is provided between two adjacent telescopic members. The separator is movably inserted into the receiving groove and can move axially along the receiving groove to adjust the extension. The matching surfaces of the telescopic member and the separator are sealed.

5. The communication channel excavation test device according to claim 1, characterized in that: The first locking mechanism includes at least one first screw hole formed on the inner wall and / or outer wall of the channel body corresponding to each telescopic member, and a first screw rod that cooperates with the first screw hole. The first screw rod can be screwed along the first screw hole until it abuts against the telescopic member.

6. The communication channel excavation test device according to claim 1, characterized in that: The second inner liner includes a plurality of axially distributed first pressure members, which can slide annularly along the first receiving groove. The third inner liner includes a plurality of axially distributed second pressure members, which can slide annularly along the second receiving groove.

7. The communication channel excavation test system is characterized by: include: A model box, a support bladder, a monitoring system, and an excavation test device as described in any one of claims 1 to 6, wherein the model box is used to contain the test soil, the excavation test device can be buried in the test soil, the support bladder is arranged in a simulated communication channel, and when a fluid of a predetermined pressure is injected into the interior of the support bladder, it can form support for the inner wall of the simulated communication channel, and the monitoring system is used to obtain the required deformation and / or displacement data of the simulated communication channel.

8. The communication channel excavation test system according to claim 7, characterized in that: It also includes a sealing support body with relatively high strength, which is filled in the local gap between the joints of the first inner liner and the second and third inner liner or the matching places of the second and third inner liner.

9. A test method using the communication channel excavation test system according to claim 7 or 8, characterized in that: The steps include: S1. Adjust the axial extension of the telescopic member and the circumferential positions of the second and third inner liner according to the test conditions and requirements, so that the second and third inner liner fit together and abut against the telescopic member extending into the opening, and complete the connection operation of the excavation test device; S2. Injecting a fluid of predetermined pressure into the support bladder so that the support bladder supports the simulated communication channel; S3. burying the excavated test device in the test soil and compacting it; S4, draining the fluid in the support bag to simulate the excavation unloading phenomenon when excavating the construction communication channel; S5. Acquire deformation and / or displacement data of the simulated communication channel through the monitoring system.

10. The test method according to claim 9, wherein: In step S1, after the second inner liner and the third inner liner are matched and abutted against the first inner liner that partially extends into the opening, if there is a local gap at the junction of the first inner liner and the second inner liner and the third inner liner or at the matching point of the second inner liner and the third inner liner, a sealing support body with higher strength is filled in the local gap.

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