Tunnel excavation face temperature adjusting device, method and system

Abstract

The invention relates to a tunnel freezing and thawing cycle excavation operation device, method and system. The tunnel freezing and thawing cycle excavation operation device comprises a heating system. A refrigeration system; the U-shaped pipe comprises a melting circulation U-shaped pipe and a freezing circulation U-shaped pipe; the main control system is used for controlling the heating system to heat liquid by issuing a melting control instruction to the heating system, and hot fluid circulation is carried out in the melting circulation U-shaped pipe, so that the surrounding rock is heated and melted; or the control system is used for sending a freezing control instruction to the refrigerating system to control the refrigerating system to carry out liquid cooling, and cold fluid circulation is carried out in the melting circulation U-shaped pipe, so that the surrounding rock is cooled and frozen. In this way, the tunnel excavation face temperature adjustment and surrounding rock degradation can be achieved through the tunnel freezing and thawing cycle excavation operation device, and therefore the tunnel excavation difficulty can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of civil engineering, and in particular to a tunnel excavation face temperature control device, a tunnel excavation face temperature control method and a tunnel excavation face temperature control system. Background Art

[0002] At present, my country's tunnel construction is developing in the direction of deep burial and long length. Deep buried tunnels are generally faced with complex geological environments, which will cause a series of geological disasters such as high geothermal temperature, high geostress, and high-pressure sudden water. For the treatment of high geothermal heat damage, traditional cooling methods such as tunnel ventilation and artificial ice making have obvious shortcomings. Tunnel ventilation in deep and long tunnels requires laying more air ducts, which occupies the space of the tunnel. Artificial ice making and other methods are time-consuming in the ice making and transportation process. The laying of ice blocks interferes with construction and causes environmental pollution. At present, there are no better technical means and equipment innovations for the prevention and control of heat damage and other associated disasters (high-pressure sudden water, etc.) during the construction stage of high geothermal tunnels. Therefore, it is necessary to study a new type of composite device to solve the above problems at the same time. Summary of the invention

[0003] In view of this, the embodiments of the present disclosure are intended to provide a tunnel excavation face temperature control device, a tunnel excavation face temperature control method and a tunnel excavation face temperature control system.

[0004] The technical solution of the present disclosure is achieved as follows:

[0005] In a first aspect, the present disclosure provides a tunnel excavation face temperature control device.

[0006] The tunnel excavation face temperature control device provided by the embodiment of the present disclosure includes:

[0007] A heating system, used for heating the liquid in the heating tank and transmitting the heated hot fluid to the exchange system;

[0008] A refrigeration system is used to refrigerate the liquid in the normal temperature storage tank and transport the refrigerated cold fluid to the exchange system;

[0009] The exchange system includes a hot fluid circulation channel and a cold fluid circulation channel;

[0010] The U-shaped tube includes a melting cycle U-shaped tube and a freezing cycle U-shaped tube; wherein the melting cycle U-shaped tube is connected to the hot fluid circulation channel, and the freezing cycle U-shaped tube is connected to the cold fluid circulation channel;

[0011] A main control system is connected to the heating system and the cooling system, and is used to control the heating system to heat the liquid and circulate the hot fluid in the melting circulation U-tube to achieve heating and melting of the surrounding rock by issuing a melting control instruction to the heating system; or

[0012] It is used to control the refrigeration system to cool the liquid by issuing a freezing control instruction to the refrigeration system, and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock.

[0013] In some embodiments, the heating system is used to transport the heated thermal fluid to the exchange system through the first flow conduit;

[0014] The refrigeration system is used to transport the refrigerated cold fluid to the exchange system through a second guide pipe; the first guide pipe is connected to the first channel opening of the hot fluid circulation channel, and the second guide pipe is connected to the first channel opening of the cold fluid circulation channel;

[0015] The melting circulation U-shaped tube is connected to the second channel opening of the thermal fluid circulation channel, and the first channel opening of the thermal fluid circulation channel is connected to the second channel opening of the thermal fluid circulation channel to form two connected channel openings in the thermal fluid circulation channel;

[0016] The refrigeration cycle U-tube is connected to the second channel opening of the cold fluid circulation channel, and the first channel opening of the cold fluid circulation channel is connected to the second channel opening of the cold fluid circulation channel to form two connected channel openings in the cold fluid circulation channel; wherein,

[0017] The hot fluid generated by the heating system circulates in the melting circulation U-tube through the hot fluid circulation channel of the exchange system;

[0018] The cold fluid generated by the refrigeration system circulates in the refrigeration cycle U-tube through the cold fluid circulation channel of the exchange system.

[0019] In some embodiments, the heat fluid circulation channel of the exchange system includes a heat fluid inflow channel and a heat fluid outflow channel; wherein the outer circulation inlet of the heat fluid inflow channel is connected to the fluid flow inlet of the melting circulation U-shaped tube, and the heat circulation inlet of the heat fluid inflow channel is connected to the first inflow branch pipe of the first guide pipe;

[0020] The outer circulation outlet of the hot fluid outflow channel is communicated with the fluid outflow outlet of the melting circulation U-tube, and the thermal circulation outlet of the hot fluid outflow channel is communicated with the first outflow branch pipe of the first guide pipe.

[0021] In some embodiments, the cold fluid circulation channel of the exchange system includes a cold fluid inflow channel and a cold fluid outflow channel;

[0022] The outer circulation inlet of the cold fluid inflow channel is connected to the fluid inlet of the refrigeration cycle U-tube, and the cold circulation inlet of the cold fluid inflow channel is connected to the second inflow branch pipe of the second guide pipe;

[0023] The outer circulation outlet of the cold fluid outflow channel is communicated with the fluid outflow outlet of the melting circulation U-shaped tube, and the cold circulation outlet of the cold fluid outflow channel is communicated with the second outflow branch pipe of the second guide pipe.

[0024] In some embodiments, the exchange system includes four independently isolated channels separated by partitions in a three-dimensional space; the four independently isolated channels include the hot fluid inlet channel, the hot fluid outflow channel, the cold fluid inlet channel and the cold fluid outflow channel; wherein, the external circulation inlet of the hot fluid inlet channel, the external circulation outlet of the hot fluid outflow channel, the external circulation inlet of the cold fluid inlet channel and the external circulation outlet of the cold fluid outflow channel are respectively composed of 16 channel openings; wherein, the caliber of each of the 16 channel openings is equal to the caliber of the tube opening of the U-shaped tube.

[0025] In some embodiments, a condensation net is provided in the hot fluid outflow channel of the exchange system; a pressure relief channel is provided in the hot fluid outflow channel of the exchange system; the pressure relief channel is connected to the liquid storage tank of the heating system; wherein,

[0026] When the pressure in the heating tank of the exchange system is too high, part of the liquid in the hot fluid outflow channel is cooled by the condensation network of the exchange system and then flows back to the liquid storage tank through the pressure relief channel; wherein, the heating tank of the exchange system is used to heat the liquid in the heating system; the first inflow branch pipe of the first flow guide pipe and the first outflow branch pipe of the first flow guide pipe are both connected to the heating tank.

[0027] In some embodiments, including:

[0028] A temperature sensor, located outside the U-shaped tube, for measuring the outside temperature of the U-shaped tube;

[0029] A temperature detector is electrically connected to the temperature sensor and is used to monitor the outer temperature of the U-shaped tube through the temperature sensor.

[0030] In some embodiments, including:

[0031] An electrode probe, located outside the U-shaped tube, for measuring the resistivity between the two U-shaped tubes;

[0032] A damage detector is connected to the electrode probe and is used to monitor the resistivity between the two U-shaped tubes through the electrode probe.

[0033] In a second aspect, the present disclosure provides a tunnel excavation face temperature control method, which is applied to a tunnel excavation face temperature control device, wherein the tunnel excavation face temperature control device includes a heating system, a cooling system, an exchange system, a U-shaped tube, and a main control system; the main control system is connected to the heating system and the cooling system; the heating system and the cooling system are both connected to the exchange system; the exchange system includes a hot fluid circulation channel and a cold fluid circulation channel; the U-shaped tube includes a melting circulation U-shaped tube and a freezing circulation U-shaped tube; wherein the melting circulation U-shaped tube is connected to the hot fluid circulation channel; the freezing circulation U-shaped tube is connected to the cold fluid circulation channel; the tunnel excavation face temperature control device is placed in a surrounding rock borehole;

[0034] The method comprises:

[0035] monitoring the resistivity of the surrounding rock through the main control system;

[0036] Determining whether the surrounding rock needs to be subjected to freeze-thaw cycle treatment according to the resistivity of the surrounding rock;

[0037] If the surrounding rock needs to be subjected to freeze-thaw cycle treatment, a melting control instruction is sent to the heating system to control the heating system to perform liquid heating and circulate hot fluid in the melting cycle U-tube to achieve heating and melting of the surrounding rock; or,

[0038] A freezing control instruction is issued to the refrigeration system to control the refrigeration system to cool the liquid and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock.

[0039] In a third aspect, the present disclosure provides a tunnel excavation face temperature control system, comprising the tunnel excavation face temperature control device described in the first aspect above.

[0040] The tunnel excavation face temperature control device according to the embodiment of the present disclosure includes a heating system for heating the liquid in the heating tank and conveying the heated hot fluid to the exchange system; a refrigeration system for refrigerating the liquid in the normal temperature storage tank and conveying the refrigerated cold fluid to the exchange system; the exchange system includes a hot fluid circulation channel and a cold fluid circulation channel; a U-tube includes a melting circulation U-tube and a freezing circulation U-tube; wherein the melting circulation U-tube is connected to the hot fluid circulation channel, and the freezing circulation U-tube is connected to the cold fluid circulation channel; a main control system is connected to the heating system and the refrigeration system, and is used to control the heating system to heat the liquid by issuing a melting control instruction to the heating system, and circulate the hot fluid in the melting circulation U-tube to achieve heating and melting of the surrounding rock; or, is used to control the refrigeration system to cool the liquid by issuing a freezing control instruction to the refrigeration system, and circulate the cold fluid in the melting circulation U-tube to achieve cooling and freezing of the surrounding rock. When the surrounding rock needs to be subjected to freeze-thaw cycle treatment, the present application can send a melting control instruction to the heating system through the main control system, control the heating system to heat the liquid, and circulate the hot fluid in the melting cycle U-tube to achieve heating and melting of the surrounding rock; or, it can be used to send a freezing control instruction to the refrigeration system to control the refrigeration system to cool the liquid, and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock. In this way, the tunnel excavation surface temperature adjustment and surrounding rock deterioration can be achieved through the tunnel freeze-thaw cycle excavation operation device, which is conducive to reducing the difficulty of tunnel excavation.

[0041] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic structural diagram of a tunnel excavation face temperature control device according to an exemplary embodiment;

[0043] Figure 2 is a structural diagram of a tunnel excavation face temperature control device according to an exemplary embodiment;

[0044] Figure 3 is a schematic diagram of a switching system structure according to an exemplary embodiment;

[0045] Figure 4 is a schematic diagram of a circulation inlet and outlet of an exchange system according to an exemplary embodiment;

[0046] Figure 5 It is a flow chart of a method for adjusting temperature of a tunnel excavation face according to an exemplary embodiment. DETAILED DESCRIPTION

[0047] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0048] At present, my country's tunnel construction is developing in the direction of deep burial and long length. Deep buried tunnels generally face complex geological environments, which can cause a series of geological disasters such as high geothermal temperature, high geostress, and high-pressure sudden water gushing.

[0049] For the treatment of high geothermal heat damage, traditional cooling methods such as tunnel ventilation and artificial ice making have obvious shortcomings. Tunnel ventilation in long and deep tunnels requires laying more air ducts, which occupies the space of the tunnel. Artificial ice making and other methods are time-consuming in the ice making and transportation process. The laying of ice blocks interferes with construction and causes environmental pollution. At present, there are no better technical means and equipment innovations for the prevention and control of heat damage and other associated disasters (high-pressure sudden water, etc.) during the construction stage of high geothermal tunnels. Therefore, it is necessary to study a new type of composite device to solve the above problems at the same time.

[0050] In view of the above situation, the present invention provides a tunnel excavation face temperature control device. Figure 1 FIG. 1 is a schematic diagram of a temperature control device for a tunnel excavation surface according to an exemplary embodiment. Figure 1 As shown, the tunnel excavation face temperature control device comprises:

[0051] The heating system 02 is used to heat the liquid in the heating tank and transport the heated hot fluid to the exchange system;

[0052] Refrigeration system 03, used to refrigerate the liquid in the normal temperature storage tank and transport the refrigerated cold fluid to the exchange system;

[0053] The exchange system 04 includes a hot fluid circulation channel and a cold fluid circulation channel;

[0054] The U-shaped tube 05 includes a melting cycle U-shaped tube 05 and a freezing cycle U-shaped tube 05; wherein the melting cycle U-shaped tube 05 is connected to the hot fluid circulation channel, and the freezing cycle U-shaped tube 05 is connected to the cold fluid circulation channel;

[0055] The main control system 01 is connected to the heating system and the cooling system, and is used to control the heating system to heat the liquid by issuing a melting control instruction to the heating system, and to circulate the hot fluid in the melting circulation U-tube 05 to achieve heating and melting of the surrounding rock; or

[0056] It is used to control the refrigeration system to cool the liquid by issuing a freezing control instruction to the refrigeration system, and circulate the cold fluid in the melting cycle U-tube 05 to achieve cooling and freezing of the surrounding rock.

[0057] In this exemplary embodiment, Figure 2 FIG. 1 is a structural diagram of a temperature control device for a tunnel excavation surface according to an exemplary embodiment. Figure 2 As shown, the heating system has a heating and stirring network, and the cooling system has a cooling host. The heating system includes a heating tank 023, a liquid storage tank 021 and a heating and stirring network 024; the heating and stirring network 024 is connected to the motor 022. Among them, the heating tank 023 is connected to the exchange system through the first guide tube. The heated liquid in the heating tank 023 flows into the exchange system through the first guide tube. Then it flows into the melting circulation U-tube 05 through the exchange system for hot fluid circulation to achieve heating and melting of the surrounding rock. Among them, the heating tank 023 has a heating and stirring network 024. The liquid in the heating tank 023 can be heated by the heating and stirring network 024. Among them, the heating range of the heating tank 023 in the heating system is 0-100°C, with a built-in motor and a heating stirring net 024. A liquid level measuring device is arranged inside the tank body. When the liquid level is lower than the limit value, the liquid level control system controls the liquid storage tank valve 026 to open and replenish the liquid. If the pressure of the heating tank 023 is too high, the pressure valve 025 of the exchange system opens to allow excess liquid to flow back to the liquid storage tank 021.

[0058] In this exemplary embodiment, the refrigeration system includes a refrigeration main unit, a normal temperature storage tank 031 and a low temperature storage tank 032. The liquid in the normal temperature storage tank 031 flows into the refrigeration main unit for liquid cooling, and the cooled liquid flows into the low temperature storage tank 032, and then flows into the exchange system from the low temperature storage tank 032. Then, it flows into the melting cycle U-tube 05 through the exchange system for cold fluid circulation to achieve cooling and freezing of the surrounding rock. Among them, the refrigeration range of the refrigeration main unit in the refrigeration system is -50℃~0℃, and the normal temperature liquid is converted into frozen liquid and stored in the low temperature storage tank 032. The low temperature storage tank 032 and the normal temperature storage tank 031 are used to store uncirculated fluid and circulated fluid, respectively, and are made of metal, and the outer shell is covered with thermal insulation cotton.

[0059] In this exemplary embodiment, when the tunnel excavation face temperature control device is used, a hole is drilled on the face, the freeze-thaw cycle U-tube 05 is placed in the drilled hole and water is injected, and the hole is sealed with a sealing plate.

[0060] The freeze-thaw cycle excavation operation device for a tunnel according to the embodiment of the present disclosure includes a heating system for heating the liquid in the heating tank 023 and conveying the heated hot fluid to the exchange system; a refrigeration system for refrigerating the liquid in the normal temperature storage tank and conveying the refrigerated cold fluid to the exchange system; the exchange system includes a hot fluid circulation channel and a cold fluid circulation channel; a U-shaped tube 05, including a melting cycle U-shaped tube 05 and a freezing cycle U-shaped tube 05; wherein the melting cycle U-shaped tube 05 is connected to the hot fluid circulation channel, and the freezing cycle U-shaped tube 05 is connected to the cold fluid circulation channel; a main control system connected to the heating system and the refrigeration system, for sending a melting control instruction to the heating system, controlling the heating system to heat the liquid, and circulating the hot fluid in the melting cycle U-shaped tube 05, so as to achieve heating and melting of the surrounding rock; or, for sending a freezing control instruction to the refrigeration system, controlling the refrigeration system to cool the liquid, and circulating the cold fluid in the melting cycle U-shaped tube 05, so as to achieve cooling and freezing of the surrounding rock. When the surrounding rock needs to be subjected to freeze-thaw cycle treatment, the present application can send a melting control instruction to the heating system through the main control system to control the heating system to heat the liquid and circulate the hot fluid in the melting cycle U-tube 05 to achieve heating and melting of the surrounding rock; or, it can send a freezing control instruction to the refrigeration system to control the refrigeration system to cool the liquid and circulate the cold fluid in the melting cycle U-tube 05 to achieve cooling and freezing of the surrounding rock. In this way, the tunnel excavation face temperature adjustment and surrounding rock deterioration can be achieved through the tunnel freeze-thaw cycle excavation operation device, which is conducive to reducing the difficulty of tunnel excavation.

[0061] In some embodiments, the heating system is used to transport the heated thermal fluid to the exchange system through the first flow conduit;

[0062] The refrigeration system is used to transport the refrigerated cold fluid to the exchange system through a second guide pipe; the first guide pipe is connected to the first channel opening of the hot fluid circulation channel, and the second guide pipe is connected to the first channel opening of the cold fluid circulation channel;

[0063] The melting circulation U-shaped tube 05 is connected to the second channel opening of the thermal fluid circulation channel, and the first channel opening of the thermal fluid circulation channel is connected to the second channel opening of the thermal fluid circulation channel to form two connected channel openings in the thermal fluid circulation channel;

[0064] The refrigeration cycle U-tube 05 is connected to the second channel opening of the cold fluid circulation channel, and the first channel opening of the cold fluid circulation channel is connected to the second channel opening of the cold fluid circulation channel to form two connected channel openings in the cold fluid circulation channel; wherein,

[0065] The hot fluid generated by the heating system circulates in the melting circulation U-tube 05 through the hot fluid circulation channel of the exchange system;

[0066] The cold fluid generated by the refrigeration system circulates in the refrigeration cycle U-tube 05 through the cold fluid circulation channel of the exchange system.

[0067] In this exemplary embodiment, the hot fluid circulation channel and the cold fluid circulation channel in the exchange system are two independently isolated fluid circulation channels. The first flow guide pipe is connected to the first channel opening of the hot fluid circulation channel, so that the hot fluid heated by the heating system can flow into the hot fluid circulation channel through the first flow guide pipe, and then flow from the hot fluid circulation channel into the melting circulation U-tube 05 for hot fluid circulation, so as to achieve heating and melting of the surrounding rock. The second flow guide pipe is connected to the first channel opening of the cold fluid circulation channel, so that the cold fluid cooled by the refrigeration system can flow into the cold fluid circulation channel through the second flow guide pipe, and then flow from the cold fluid circulation channel into the freezing circulation U-tube 05 for cold fluid circulation, so as to achieve cooling and freezing of the surrounding rock.

[0068] In some embodiments, the heat fluid circulation channel of the exchange system includes a heat fluid inflow channel and a heat fluid outflow channel; wherein the outer circulation inlet of the heat fluid inflow channel is connected to the fluid inlet of the melting circulation U-tube 05, and the heat circulation inlet of the heat fluid inflow channel is connected to the first inflow branch pipe of the first guide pipe;

[0069] The outer circulation outlet of the hot fluid outflow channel is connected to the fluid outflow outlet of the melting circulation U-tube 05, and the thermal circulation outlet of the hot fluid outflow channel is connected to the first outflow branch pipe of the first guide pipe.

[0070] In this exemplary embodiment, the cold fluid circulation channel of the exchange system includes a cold fluid inflow channel and a cold fluid outflow channel;

[0071] The outer circulation inlet of the cold fluid inflow channel is connected to the fluid inlet of the refrigeration cycle U-tube 05, and the cold circulation inlet of the cold fluid inflow channel is connected to the second inflow branch pipe of the second guide pipe;

[0072] The outer circulation outlet of the cold fluid outflow channel is connected to the fluid outflow outlet of the melting circulation U-tube 05, and the cold circulation outlet of the cold fluid outflow channel is connected to the second outflow branch pipe of the second guide pipe.

[0073] In this exemplary embodiment, the hot fluid circulation channel and the cold fluid circulation channel in the exchange system are two independently isolated fluid circulation channels. The hot fluid circulation channel of the exchange system includes a hot fluid inflow channel and a hot fluid outflow channel. The cold fluid circulation channel of the exchange system includes a cold fluid inflow channel and a cold fluid outflow channel. Figure 3 The diagram is a schematic diagram of a switching system structure according to an exemplary embodiment. Figure 4 FIG. 1 is a schematic diagram of a circulation inlet and outlet of an exchange system according to an exemplary embodiment. Figure 3 , 4 As shown, the hot fluid inflow channel has two channel openings, namely the hot cycle inlet of the hot fluid inflow channel and the external cycle inlet of the hot fluid inflow channel. The hot fluid outflow channel has two channel openings, namely the hot cycle outlet and the external cycle outlet. The cold fluid inflow channel has two channel openings, namely the cold cycle inlet and the external cycle inlet. The cold fluid outflow channel has two channel openings, namely the cold cycle outlet and the external cycle outlet.

[0074] In this exemplary embodiment, the exchange system includes four independently isolated channels separated by partitions in a three-dimensional space; the four independently isolated channels include the hot fluid inlet channel, the hot fluid outflow channel, the cold fluid inlet channel and the cold fluid outflow channel; wherein, the external circulation inlet of the hot fluid inlet channel, the external circulation outlet of the hot fluid outflow channel, the external circulation inlet of the cold fluid inlet channel and the external circulation outlet of the cold fluid outflow channel are respectively composed of 16 channel openings; wherein, the caliber of each of the 16 channel openings is equal to the caliber of the tube opening of the U-shaped tube 05.

[0075] In this exemplary embodiment, the hot fluid can be circulated through the hot fluid inflow channel and the hot fluid outflow channel. The cold fluid can be circulated through the cold fluid inflow channel and the cold fluid outflow channel. At the same time, there are multiple U-shaped tubes 05 between every two channels. Multiple U-shaped tubes 05 can simultaneously flow hot fluid or cold fluid to accelerate the hot fluid circulation or cold fluid circulation.

[0076] In this exemplary embodiment, Figure 3 As shown, the exchange system is divided into 4 storage spaces by the partition, the upper 2 spaces are used for hot circulation, and the lower 2 spaces are used for cold circulation; the external circulation inlet and the external circulation outlet are connected to the freeze-thaw cycle U-tube 05, and a total of 64 electric control valves are set at the external circulation inlet and outlet, which are controlled by the main control system, and can meet the work of 16 freeze-thaw cycle U-tubes 05 at the same time, and multiple exchange systems can be connected in parallel at the same time to expand the number of operations; the upper half of the other side of the exchange system is connected to the hot circulation inlet and outlet, and the lower half is connected to the cold circulation inlet and outlet, which are used to exchange hot and cold circulation liquids respectively; as shown Figure 3As shown, the upper part of the exchange system has a heat cycle exchange, and a condensation network and a pressure relief channel are arranged inside it to release the pressure of the heating tank 023 for the reflux liquid.

[0077] In some embodiments, a condensation net is provided in the hot fluid outflow channel of the exchange system; a pressure relief channel is provided in the hot fluid outflow channel of the exchange system; the pressure relief channel is connected to the liquid storage tank 021 of the heating system; wherein,

[0078] When the pressure in the heating tank 023 of the exchange system is too high, part of the liquid in the hot fluid outflow channel is cooled by the condensation network of the exchange system and then flows back to the liquid storage tank 021 through the pressure relief channel; wherein, the heating tank 023 of the exchange system is used to heat the liquid in the heating system; the first inflow branch pipe of the first flow guide pipe and the first outflow branch pipe of the first flow guide pipe are both connected to the heating tank 023.

[0079] In this exemplary embodiment, during the freezing cycle, the main control system controls the exchange system to open the electric control gate of the cold cycle channel and close the electric gate of the hot cycle. After receiving the instruction from the main control system, the refrigeration system generates frozen liquid into the low-temperature storage tank through the refrigeration host, which is poured into the exchange system through the booster pump 033 and transmitted from the cold cycle inlet of the exchange system to each freeze-thaw cycle U-tube 05. The circulating liquid circulates to the normal temperature storage tank through the cold cycle outlet of the exchange system and then reaches the refrigeration host for re-refrigeration.

[0080] During the thawing cycle, the main control system controls the exchange system to open the electric control gate of the hot cycle channel and close the electric gate of the cold cycle. After the heating system receives the command from the main control system, the hot fluid generated by the heating tank 023 is poured into the exchange system through the booster pump 033, and is transmitted from the heat cycle inlet of the exchange system to each freeze-thaw cycle U-tube 05. The circulating liquid circulates to the heating tank 023 through the heat cycle outlet of the exchange system.

[0081] When the pressure in the heating tank 023 is too high, part of the liquid is cooled by the condensation net of the exchange system and then flows back to the liquid storage tank 021 through the pressure relief channel. When the liquid level in the heating tank 023 is too low or the pressure is insufficient, the liquid level control system controls the valve of the liquid storage tank 021 to open and start replenishing the liquid. The condensation net can increase the channel length, so that the hot fluid condenses into liquid during the migration process, preventing the phenomenon of excessive pressure caused by excessive gas.

[0082] In some embodiments, including:

[0083] The temperature sensor 036 is located outside the U-shaped tube 05 and is used to measure the temperature outside the U-shaped tube 05;

[0084] The temperature detector is electrically connected to the temperature sensor 036 and is used to monitor the outside temperature of the U-shaped tube 05 through the temperature sensor 036. The temperature detector is connected to the temperature sensor 036 on the freeze-thaw cycle U-shaped tube 05, with a measurement range of -60 to 150°C and a measurement interval of 0.2h.

[0085] In this exemplary embodiment, it includes:

[0086] The electrode probe 035 is located outside the U-shaped tube 05 and is used to measure the resistivity between the two U-shaped tubes 05;

[0087] The damage detector is connected to the electrode probe 035 and is used to monitor the resistivity between the two U-shaped tubes 05 through the electrode probe 035. The damage detector is connected to the electrode probe 035 on the freeze-thaw cycle U-shaped tube 05 to measure the conductivity between every two freeze-thaw cycle U-shaped tubes 05, and the measurement interval is 0.2h.

[0088] In this exemplary embodiment, the temperature sensor in this application measures the surrounding rock temperature through the temperature sensor 036 on the freeze-thaw cycle U-tube 05, and uploads the surrounding rock temperature to the main control system. At the same time, the resistivity of the medium is directly measured by the electrode probe 035. The outer temperature of the U-tube 05, that is, the medium temperature, is measured by the temperature sensor 036. Among them, the main control system receives the damage monitor and the temperature monitor signals, and controls the number of cold and hot cycles of the freeze-thaw cycle system and the freezing and melting temperatures. In this application, after the temperature is measured, the influence of temperature on the resistivity can be eliminated, and only the resistivity of the medium is calculated. Among them, multiple temperature sensors 036 and multiple electrode probes 035 can be arranged on the U-tube 05. For example, 6 temperature sensors 036 and 6 electrode probes 035 are arranged on the freeze-thaw cycle U-tube 05. In this application, the freeze-thaw cycle U-tube 05 is a closed tube, and its end has a total of 4 inlets and outlets, 2 cold flow and hot flow cycle inlets and outlets, and the material is a metal tube with good thermal conductivity.

[0089] In this exemplary embodiment, the freeze-thaw cycle system (refrigeration system, heating system) includes two parts: a refrigeration system and a heating system; the refrigeration system mainly includes 6 parts including a refrigeration main unit, a low-temperature storage tank, a normal temperature storage tank, a booster pump, and a fluid conduit; the heating system mainly includes 5 parts including a heating tank 023, a liquid storage tank 021, a booster pump, a motor and a valve.

[0090] In this exemplary embodiment, the damage monitor measures the resistivity of the surrounding rock between the two boreholes through the electrode probe 035 on the freeze-thaw cycle U-tube 05, thereby evaluating the surrounding rock damage and the degree of crack penetration. When the resistivity remains unchanged, the freeze-thaw cycle operation is terminated, and a signal is sent to the main control system, which stops the system operation. Among them, the resistivity of the surrounding rock is usually affected by the degree of crack development. In the presence of water, the more cracks there are, the lower the resistivity of the surrounding rock is, so as to evaluate the damage of the surrounding rock and the degree of crack penetration. During the freeze-thaw cycle, the freezing temperature, the melting temperature and the cycle time are set in the main control system, and the main control system controls the heating system, the cooling system and the exchange system to start working.

[0091] In this exemplary embodiment, when it is necessary to continuously freeze the groundwater seepage location and the fault exposure location, the regional refrigeration system is individually set by the main control system to maintain a continuous working state.

[0092] In the present application, compared with the traditional ice making and cooling technology, the temperature regulating device utilizes the freeze-thaw cycle U-tube 05 to circulate the freeze-thaw medium, thereby reducing environmental pollution.

[0093] In the present application, the temperature control device occupies a smaller space in underground projects compared to traditional ventilation and cooling technologies, especially reducing the laying of ventilation pipes in long tunnels.

[0094] In the present application, the refrigeration system achieves the purpose of reinforcing the surrounding rock and sealing the groundwater by freezing the surrounding rock and groundwater. The cyclic operation of the refrigeration and heating system further deteriorates the surrounding rock parameters, which is beneficial to improving the rock breaking effect. The present device utilizes the influence of the freeze-thaw cycle on the rock and groundwater, which not only achieves the purpose of reducing the heat damage caused by high geothermal temperature, but also further improves the excavation effect.

[0095] The temperature detector is connected to the temperature sensor 036 on the freeze-thaw cycle U-tube 05, the measuring range is -60 to 150° C., and the measuring interval is 0.2 h.

[0096] The present disclosure provides a tunnel excavation face temperature control method, which is applied to a tunnel excavation face temperature control device, wherein the tunnel excavation face temperature control device includes a heating system, a refrigeration system, an exchange system, a U-shaped tube, and a main control system; the main control system is connected to the heating system and the refrigeration system; the heating system and the refrigeration system are both connected to the exchange system; the exchange system includes a hot fluid circulation channel and a cold fluid circulation channel; the U-shaped tube includes a melting circulation U-shaped tube and a freezing circulation U-shaped tube; wherein the melting circulation U-shaped tube is connected to the hot fluid circulation channel; the freezing circulation U-shaped tube is connected to the cold fluid circulation channel; the tunnel excavation face temperature control device is placed in a surrounding rock borehole;

[0097] Figure 5FIG. 1 is a flow chart of a method for adjusting the temperature of a tunnel excavation face according to an exemplary embodiment. Figure 5 As shown, the tunnel excavation face temperature control method includes:

[0098] Step 10: monitoring the resistivity of the surrounding rock through the main control system;

[0099] Step 11: Determine whether the surrounding rock needs to be subjected to freeze-thaw cycle treatment according to the resistivity of the surrounding rock;

[0100] Step 12: if the surrounding rock needs to be subjected to freeze-thaw cycle treatment, a melting control instruction is sent to the heating system to control the heating system to perform liquid heating and circulate hot fluid in the melting cycle U-tube to achieve heating and melting of the surrounding rock; or,

[0101] A freezing control instruction is issued to the refrigeration system to control the refrigeration system to cool the liquid and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock.

[0102] In this exemplary embodiment, the heating system has a heating and stirring network, and the refrigeration system has a refrigeration host. The heating system includes a heating tank, a liquid storage tank and a heating and stirring network; wherein the heating tank is connected to the exchange system through a first flow guide pipe. The heated liquid in the heating tank flows into the exchange system through the first flow guide pipe. Then it flows into the melting circulation U-tube through the exchange system for hot fluid circulation to achieve heating and melting of the surrounding rock. wherein the heating tank has a heating and stirring network. The liquid in the heating tank can be heated by the heating and stirring network.

[0103] In this exemplary embodiment, the refrigeration system includes a refrigeration main unit, a normal temperature storage tank, and a low temperature storage tank. The liquid in the normal temperature storage tank flows into the refrigeration main unit for liquid cooling, and the cooled liquid flows into the low temperature storage tank, and then flows from the low temperature storage tank into the exchange system. Then, the liquid flows into the melting cycle U-tube through the exchange system for cold fluid circulation, so as to achieve cooling and freezing of the surrounding rock.

[0104] In this exemplary embodiment, when the tunnel excavation face temperature control device is used, a hole is drilled on the face, a freeze-thaw cycle U-tube is placed in the drilled hole and water is injected, and the hole is sealed with a sealing plate 034.

[0105] The method for adjusting the temperature of a tunnel excavation face according to an embodiment of the present disclosure includes monitoring the resistivity of the surrounding rock through the main control system;

[0106] Determining whether the surrounding rock needs to be subjected to freeze-thaw cycle treatment according to the resistivity of the surrounding rock;

[0107] If the surrounding rock needs to be subjected to freeze-thaw cycle treatment, a melting control instruction is sent to the heating system to control the heating system to perform liquid heating and circulate hot fluid in the melting cycle U-tube to achieve heating and melting of the surrounding rock; or,

[0108] A freezing control instruction is issued to the refrigeration system to control the refrigeration system to cool the liquid, and a cold fluid is circulated in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock. When the surrounding rock needs to be subjected to freeze-thaw cycle treatment, the present application can issue a melting control instruction to the heating system through the main control system to control the heating system to heat the liquid, and circulate the hot fluid in the melting cycle U-tube to achieve heating and melting of the surrounding rock; or, it is used to issue a freezing control instruction to the refrigeration system to control the refrigeration system to cool the liquid, and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock. In this way, the tunnel excavation surface temperature adjustment and surrounding rock deterioration can be achieved through the tunnel freeze-thaw cycle excavation operation device, which is conducive to reducing the difficulty of tunnel excavation.

[0109] The determining whether the surrounding rock needs to be subjected to freeze-thaw cycle treatment according to the resistivity of the surrounding rock comprises:

[0110] The damage monitor measures the resistivity of the surrounding rock between the two boreholes through the electrode probe on the freeze-thaw cycle U-tube, thereby evaluating the surrounding rock damage and the degree of crack penetration. When the resistivity remains unchanged, the freeze-thaw cycle operation is ended and a signal is sent to the main control system, which stops the system.

[0111] In some embodiments, the heating system is used to transport the heated thermal fluid to the exchange system through the first flow conduit;

[0112] The refrigeration system is used to transport the refrigerated cold fluid to the exchange system through a second guide pipe; the first guide pipe is connected to the first channel opening of the hot fluid circulation channel, and the second guide pipe is connected to the first channel opening of the cold fluid circulation channel;

[0113] The melting circulation U-shaped tube is connected to the second channel opening of the thermal fluid circulation channel, and the first channel opening of the thermal fluid circulation channel is connected to the second channel opening of the thermal fluid circulation channel to form two connected channel openings in the thermal fluid circulation channel;

[0114] The refrigeration cycle U-tube is connected to the second channel opening of the cold fluid circulation channel, and the first channel opening of the cold fluid circulation channel is connected to the second channel opening of the cold fluid circulation channel to form two connected channel openings in the cold fluid circulation channel; wherein,

[0115] The hot fluid generated by the heating system circulates in the melting circulation U-tube through the hot fluid circulation channel of the exchange system;

[0116] The cold fluid generated by the refrigeration system circulates in the refrigeration cycle U-tube through the cold fluid circulation channel of the exchange system.

[0117] In this exemplary embodiment, the hot fluid circulation channel and the cold fluid circulation channel in the exchange system are two independently isolated fluid circulation channels. The first flow guide pipe is connected to the first channel opening of the hot fluid circulation channel, so that the hot fluid heated by the heating system can flow into the hot fluid circulation channel through the first flow guide pipe, and then flow from the hot fluid circulation channel into the melting circulation U-tube for hot fluid circulation, so as to achieve heating and melting of the surrounding rock. The second flow guide pipe is connected to the first channel opening of the cold fluid circulation channel, so that the cold fluid cooled by the refrigeration system can flow into the cold fluid circulation channel through the second flow guide pipe, and then flow from the cold fluid circulation channel into the freezing circulation U-tube for cold fluid circulation, so as to achieve cooling and freezing of the surrounding rock.

[0118] In some embodiments, the heat fluid circulation channel of the exchange system includes a heat fluid inflow channel and a heat fluid outflow channel; wherein the outer circulation inlet of the heat fluid inflow channel is connected to the fluid flow inlet of the melting circulation U-shaped tube, and the heat circulation inlet of the heat fluid inflow channel is connected to the first inflow branch pipe of the first guide pipe;

[0119] The outer circulation outlet of the hot fluid outflow channel is communicated with the fluid outflow outlet of the melting circulation U-tube, and the thermal circulation outlet of the hot fluid outflow channel is communicated with the first outflow branch pipe of the first guide pipe.

[0120] In this exemplary embodiment, the cold fluid circulation channel of the exchange system includes a cold fluid inflow channel and a cold fluid outflow channel;

[0121] The outer circulation inlet of the cold fluid inflow channel is connected to the fluid inlet of the refrigeration cycle U-tube, and the cold circulation inlet of the cold fluid inflow channel is connected to the second inflow branch pipe of the second guide pipe;

[0122] The outer circulation outlet of the cold fluid outflow channel is communicated with the fluid outflow outlet of the melting circulation U-shaped tube, and the cold circulation outlet of the cold fluid outflow channel is communicated with the second outflow branch pipe of the second guide pipe.

[0123] In this exemplary embodiment, the hot fluid circulation channel and the cold fluid circulation channel in the exchange system are two independently isolated fluid circulation channels. The hot fluid circulation channel of the exchange system includes a hot fluid inflow channel and a hot fluid outflow channel. The cold fluid circulation channel of the exchange system includes a cold fluid inflow channel and a cold fluid outflow channel. The hot fluid inflow channel has two channel openings, which are the hot circulation inlet of the hot fluid inflow channel and the external circulation inlet of the hot fluid inflow channel. The hot fluid outflow channel has two channel openings, which are the hot circulation outlet and the external circulation outlet. The cold fluid inflow channel has two channel openings, which are the cold circulation inlet and the external circulation inlet. The cold fluid outflow channel has two channel openings, which are the cold circulation outlet and the external circulation outlet.

[0124] In this exemplary embodiment, Figure 3 As shown, the exchange system includes four independently isolated channels separated by partitions in a three-dimensional space; the four independently isolated channels include the hot fluid inlet channel, the hot fluid outflow channel, the cold fluid inlet channel and the cold fluid outflow channel; wherein, the external circulation inlet of the hot fluid inlet channel, the external circulation outlet of the hot fluid outflow channel, the external circulation inlet of the cold fluid inlet channel and the external circulation outlet of the cold fluid outflow channel are respectively composed of 16 channel openings; wherein, the caliber of each of the 16 channel openings is equal to the caliber of the tube opening of the U-shaped tube.

[0125] In this exemplary embodiment, the hot fluid can be circulated through the hot fluid inflow channel and the hot fluid outflow channel. The cold fluid can be circulated through the cold fluid inflow channel and the cold fluid outflow channel. At the same time, there are multiple U-shaped tubes between every two channels. Multiple U-shaped tubes can simultaneously flow hot fluid or cold fluid to accelerate the hot fluid circulation or cold fluid circulation.

[0126] The present disclosure provides a tunnel excavation face temperature control system, comprising the tunnel excavation face temperature control device described in the above embodiments.

[0127] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0128] It should be understood that the various parts of the present disclosure can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0129] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0130] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0131] In addition, the terms "first", "second", etc. used in the embodiments of the present disclosure are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present disclosure may explicitly or implicitly indicate that at least one of the features is included in the embodiment. In the description of the present disclosure, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0132] In the present disclosure, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific implementation situation.

[0133] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0134] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A tunnel excavation face temperature control device, characterized in that: include: A heating system, used for heating the liquid in the heating tank and transmitting the heated hot fluid to the exchange system; A refrigeration system is used to refrigerate the liquid in the normal temperature storage tank and transport the refrigerated cold fluid to the exchange system; The exchange system includes a hot fluid circulation channel and a cold fluid circulation channel; The U-shaped tube includes a melting cycle U-shaped tube and a freezing cycle U-shaped tube; wherein the melting cycle U-shaped tube is connected to the hot fluid circulation channel, and the freezing cycle U-shaped tube is connected to the cold fluid circulation channel; A main control system connected to the heating system and the cooling system, for controlling the heating system to heat the liquid and circulate the hot fluid in the melting circulation U-tube to achieve heating and melting of the surrounding rock by issuing a melting control instruction to the heating system; or, It is used to control the refrigeration system to cool the liquid by issuing a freezing control instruction to the refrigeration system, and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock.

2. The tunnel excavation face temperature control device according to claim 1, characterized in that: The heating system is used to transport the heated thermal fluid to the exchange system through the first flow guide pipe; The refrigeration system is used to transport the refrigerated cold fluid to the exchange system through a second guide pipe; the first guide pipe is connected to the first channel opening of the hot fluid circulation channel, and the second guide pipe is connected to the first channel opening of the cold fluid circulation channel; The melting circulation U-shaped tube is connected to the second channel opening of the thermal fluid circulation channel, and the first channel opening of the thermal fluid circulation channel is connected to the second channel opening of the thermal fluid circulation channel to form two connected channel openings in the thermal fluid circulation channel; The refrigeration cycle U-tube is connected to the second channel opening of the cold fluid circulation channel, and the first channel opening of the cold fluid circulation channel is connected to the second channel opening of the cold fluid circulation channel to form two connected channel openings in the cold fluid circulation channel; wherein, The hot fluid generated by the heating system circulates in the melting circulation U-tube through the hot fluid circulation channel of the exchange system; The cold fluid generated by the refrigeration system circulates in the refrigeration cycle U-tube through the cold fluid circulation channel of the exchange system.

3. The tunnel excavation face temperature control device according to claim 2, characterized in that: The heat fluid circulation channel of the exchange system includes a heat fluid inflow channel and a heat fluid outflow channel; wherein the outer circulation inlet of the heat fluid inflow channel is connected to the fluid flow inlet of the melting circulation U-shaped tube, and the heat circulation inlet of the heat fluid inflow channel is connected to the first inflow branch pipe of the first guide pipe; The outer circulation outlet of the hot fluid outflow channel is communicated with the fluid outflow outlet of the melting circulation U-tube, and the thermal circulation outlet of the hot fluid outflow channel is communicated with the first outflow branch pipe of the first guide pipe.

4. The tunnel excavation face temperature control device according to claim 3, characterized in that: The cold fluid circulation channel of the exchange system includes a cold fluid inflow channel and a cold fluid outflow channel; The outer circulation inlet of the cold fluid inflow channel is connected to the fluid inlet of the refrigeration cycle U-tube, and the cold circulation inlet of the cold fluid inflow channel is connected to the second inflow branch pipe of the second guide pipe; The outer circulation outlet of the cold fluid outflow channel is communicated with the fluid outflow outlet of the melting circulation U-shaped tube, and the cold circulation outlet of the cold fluid outflow channel is communicated with the second outflow branch pipe of the second guide pipe.

5. The tunnel excavation face temperature control device according to claim 4, characterized in that: The exchange system includes four independently isolated channels separated by partitions in a three-dimensional space; the four independently isolated channels include the hot fluid inlet channel, the hot fluid outflow channel, the cold fluid inlet channel and the cold fluid outflow channel; wherein the external circulation inlet of the hot fluid inlet channel, the external circulation outlet of the hot fluid outflow channel, the external circulation inlet of the cold fluid inlet channel and the external circulation outlet of the cold fluid outflow channel are respectively composed of 16 channel openings; wherein the caliber of each of the 16 channel openings is equal to the caliber of the tube opening of the U-shaped tube.

6. The tunnel excavation face temperature control device according to claim 4, characterized in that: A condensation net is arranged in the hot fluid outflow channel of the exchange system; a pressure relief channel is opened in the hot fluid outflow channel of the exchange system; the pressure relief channel is connected to the liquid storage tank of the heating system; wherein, When the pressure in the heating tank of the exchange system is too high, part of the liquid in the hot fluid outflow channel is cooled by the condensation network of the exchange system and then flows back to the liquid storage tank through the pressure relief channel; wherein, the heating tank of the exchange system is used to heat the liquid in the heating system; the first inflow branch pipe of the first flow guide pipe and the first outflow branch pipe of the first flow guide pipe are both connected to the heating tank.

7. The tunnel excavation face temperature control device according to any one of claims 1 to 6, characterized in that: include: A temperature sensor, located outside the U-shaped tube, for measuring the outside temperature of the U-shaped tube; A temperature detector is electrically connected to the temperature sensor and is used to monitor the outer temperature of the U-shaped tube through the temperature sensor.

8. The tunnel excavation face temperature control device according to any one of claims 1 to 6, characterized in that: include: An electrode probe, located outside the U-shaped tube, for measuring the resistivity between the two U-shaped tubes; A damage detector is connected to the electrode probe and is used to monitor the resistivity between the two U-shaped tubes through the electrode probe.

9. A method for regulating the temperature of a tunnel excavation face, characterized in that: Applicable to a temperature control device for a tunnel excavation face, wherein the temperature control device for the tunnel excavation face comprises a heating system, a cooling system, an exchange system, a U-shaped tube, and a main control system; the main control system is connected to the heating system and the cooling system; the heating system and the cooling system are both connected to the exchange system; the exchange system comprises a hot fluid circulation channel and a cold fluid circulation channel; the U-shaped tube comprises a melting circulation U-shaped tube and a freezing circulation U-shaped tube; wherein the melting circulation U-shaped tube is connected to the hot fluid circulation channel; the freezing circulation U-shaped tube is connected to the cold fluid circulation channel; the temperature control device for the tunnel excavation face is placed in a surrounding rock borehole; The method comprises: monitoring the resistivity of the surrounding rock through the main control system; Determining whether the surrounding rock needs to be subjected to freeze-thaw cycle treatment according to the resistivity of the surrounding rock; If the surrounding rock needs to be subjected to freeze-thaw cycle treatment, a melting control instruction is sent to the heating system to control the heating system to perform liquid heating and circulate hot fluid in the melting cycle U-tube to achieve heating and melting of the surrounding rock; or, A freezing control instruction is issued to the refrigeration system to control the refrigeration system to cool the liquid and circulate the cold fluid in the melting cycle U-tube to achieve cooling and freezing of the surrounding rock.

10. A tunnel excavation face temperature control system, characterized in that: The invention comprises the tunnel excavation face temperature regulating device as described in any one of claims 1 to 8.

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