CN115977650A - Communication freezing system based on plane skew connection channel and construction method thereof - Google Patents
Communication freezing system based on plane skew connection channel and construction method thereof Download PDFInfo
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Abstract
The invention discloses a communication freezing system based on a plane oblique crossing connection channel and a construction method thereof, wherein the communication freezing system comprises a pair of subway tunnels, the connection channel which is communicated with the subway tunnels and is arranged at an angle of 10-30 degrees with the horizontal direction, and freezing holes which are distributed around the connection channel, wherein freezing pipes are arranged in the freezing holes, the freezing pipes and the vertical line of the subway tunnels are distributed in parallel at a horizontal included angle of 10-30 ℃, and horn-shaped freezing curtains are formed at the periphery of the freezing holes; during construction, freezing design is performed according to construction conditions and soil body properties, a finite element numerical model is built for simulation to obtain an optimal contact channel freezing Vietover freezing effect graph, and then engineering implementation is performed. This freeze the system and adopt plane skew's mode through setting up the contact passageway, be a certain angle with the level promptly, and then can realize freezing the reinforcement to the subway contact passageway of the complicated city underground space in complicated, the groundwater of stratum abundance and the wrong well-being of underground piping, overcome prior art barrier, realized freezing reinforced new breakthrough.
Description
Technical Field
The invention belongs to the technical field of freezing method construction of interconnection channels, and particularly relates to a communication freezing system based on a plane oblique intersection interconnection channel and a construction method thereof.
Background
With the continuous acceleration of the urbanization process of China in recent years, the development and utilization of urban underground space gradually reflect eye curtains of people, and in the construction of most underground engineering, the problems of excavation, support, water prevention and the like of foundation pits are involved, and the problems are influenced by engineering geology, hydrological conditions, surrounding environment and the like. With some variations, accidents are likely to occur. As a result, subway communication channels are becoming more and more prominent in the construction of subway tunnels. The subway communication channel is an underground channel connected with tunnels between two-way adjacent subway sections, has the functions of water collection and drainage, and also has the functions of emergency risk avoidance and passenger evacuation when meeting emergency situations. When the connection channel is constructed under the special working condition with complicated geological conditions, the risk of collapse is very likely to happen. Therefore, the soil around the connecting channel needs to be reinforced before excavation, so that danger is avoided. The currently common reinforcement methods mainly include: grouting, mixing pile reinforcement, horizontal jet grouting pile reinforcement in tunnels and the like, but for urban underground spaces with complex stratums, abundant underground water and complicated underground pipelines, the methods are difficult to achieve the freezing effect required by the design, such as the technology disclosed in the application number of 201910563236.9 entitled "arrangement structure and construction method of freezing holes of subway by-pass in water-rich sand layer geology; the application number is 201910929010.6, the name is the technology disclosed in the connection channel freezing construction method and the freezing system, the application number is 202120926075.8, the name is the technology disclosed in the freezing system for reinforcing the 60-meter-level ultra-long distance connection channel by a freezing method; the freezing effect of the existing contact channel of the underground space of the complex city cannot be met by the technology and the like disclosed in the application number of 202110869902.9 entitled subway tunnel contact channel construction method.
Disclosure of Invention
The invention aims to: the invention aims to provide a freezing system capable of freezing and reinforcing a subway connection channel of an urban underground space with complex stratum, abundant underground water and complex staggered underground pipelines;
the second purpose of the invention is to provide a construction method of the freezing system.
The technical scheme is as follows: the invention relates to a communication freezing system based on a plane oblique crossing communication channel, which comprises a pair of subway tunnels, and further comprises a communication channel which is communicated with the subway tunnels and arranged at an angle of 10-30 degrees with the horizontal direction, pressure relief holes which are arranged in the center of the communication channel and used for releasing freezing pressure, and freezing holes which are distributed around the communication channel, wherein freezing pipes are arranged in the freezing holes, the freezing pipes and the vertical line of the subway tunnels are arranged in parallel at a horizontal included angle of 10-30 ℃, a horn-shaped freezing curtain is formed at the periphery of the freezing holes, the subway tunnels are provided with freezing calandria along the freezing curtain at the periphery of the communication channel, and the communication channel is provided with through holes which are convenient for cooling the freezing pipes and the freezing calandria.
Furthermore, the communication channel of the freezing system of the invention is arranged at 18.1 degrees with the horizontal direction.
Furthermore, the freezing pipes of the freezing system of the invention are distributed in parallel with the vertical line of the subway tunnel at a horizontal included angle of 18.1 degrees.
Furthermore, the freezing system also comprises temperature measuring holes which are arranged around the freezing area and used for monitoring the temperature field of the freezing veiling in real time.
Furthermore, the freezing holes of the communication channel adjacent to the left line of the subway tunnel comprise upper freezing holes with the same hole spacing, lower freezing holes with the same hole spacing and two side freezing holes with the same hole spacing; the upper freezing holes comprise outer domain holes of an upper layer and two layers of inner domain holes of a lower layer, the inner domain holes of the lower layer are arranged in a quincuncial pile shape, and the lower freezing holes comprise outer domain holes of the lower layer and inner domain holes of the upper layer;
the freezing holes of the communication channel adjacent to the right line of the subway tunnel comprise an upper freezing hole, a lower freezing hole and two side freezing holes with the same hole spacing; the upper freezing holes comprise outer domain holes of an upper layer and inner domain holes of a lower layer which are arranged in a quincuncial pile shape, and the hole pitch of the outer domain holes of the upper layer is the same as that of the inner domain holes of the lower layer; the freezing holes at the lower part comprise outer domain holes of the lower layer and inner domain holes of the upper layer, and the hole intervals of the inner domain holes of the upper layer and the outer domain holes of the lower layer are the same.
Furthermore, two pairs of through holes are symmetrically distributed in the middle of each of two sides of a communication channel adjacent to the left line and the right line of the subway tunnel, and the through holes on the same side are arranged up and down.
Furthermore, four groups of temperature measuring holes are symmetrically arranged in the middle of two sides of the connecting channel adjacent to the left line of the subway tunnel, and six groups of temperature measuring holes are symmetrically arranged in the middle of two sides of the connecting channel adjacent to the right line of the subway tunnel.
The construction method of the communication freezing system based on the plane oblique crossing communication channel comprises the following steps:
(1) Freezing design is carried out according to construction conditions and soil body properties, and comprises the steps of determining the angle of a communication channel, the thickness of a freezing wall, the average temperature of the freezing wall, the flow rate of a freezing hole and the temperature of salt water, and designing a freezing pipe, a temperature measuring hole and a pressure relief hole;
(2) Establishing a finite element numerical model according to the design to simulate and obtain an optimal communication channel freezing veiling freezing effect graph;
(3) And carrying out engineering implementation according to the freezing VIEW freezing effect diagram of the optimal communication channel.
Has the advantages that: compared with the prior art, the invention has the remarkable advantages that: this freeze the system and adopt plane skew's mode through setting up the contact passageway, be a certain angle with the level promptly, and then can realize freezing the reinforcement to the subway contact passageway of the complicated city underground space in complicated, the groundwater of stratum abundance and the wrong well-being of underground piping, overcome prior art barrier, realized freezing reinforced new breakthrough. The trumpet-shaped freezing curtain formed by freezing has the advantages of strong water stopping effect, short construction period, high controllability of the freezing effect and capability of reducing the construction cost.
Drawings
FIG. 1 is an elevational view of the communication passage freezing tube and freezing hole arrangement of the present invention;
FIG. 2 is a plan view of the arrangement of the freezing tubes and the freezing holes of the communication channel of the present invention;
FIG. 3 isbase:Sub>A diagram of the arrangement of the holes at A-A (left line of the subway tunnel) and the freezing curtain effect thereof in FIG. 1;
FIG. 4 is a diagram of the arrangement of the holes at B-B (right line of the subway tunnel) and the freezing curtain effect thereof in FIG. 1;
FIG. 5 is a three-dimensional numerical model of a planar diagonal communication channel, wherein (a) is the earth mass; (b) is a communication channel;
FIG. 6 isbase:Sub>A diagram showing the effect of freezing the curtain at the point A-A in FIG. 1 after 5 days of freezing;
FIG. 7 isbase:Sub>A graph showing the effect of freezing the curtain when the place A-A in FIG. 1 is frozen for 15 days;
FIG. 8 isbase:Sub>A diagram showing the effect of freezing the curtain at the point A-A in FIG. 1 when the curtain is frozen for 25 days;
FIG. 9 isbase:Sub>A diagram showing the effect of freezing the curtain when the place A-A in FIG. 1 is frozen for 35 days.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following examples.
As shown in fig. 1 and 2, the communication freezing system based on the plane oblique communication channel of the invention comprises a pair of subway tunnels 1, a communication channel 2, freezing holes 4, through holes 7, pressure relief holes 3, temperature measuring holes 8 and freezing calandria 6. The subway tunnel 1 comprises a subway tunnel 1 left line and a subway tunnel 1 right line, the subway tunnel 1 left line and the subway tunnel 1 right line are communicated through a connection channel 2, the connection channel 2 abandons the existing vertical connection mode, and adopts a plane skew crossing mode which is 10-30 degrees with the horizontal direction, so that the technical problem that the existing freezing mode cannot achieve the freezing effect of complex terrains can be effectively solved.
The periphery of the communication channel 2 is provided with freezing holes 4, freezing pipes 5 are arranged in the freezing holes 4, the freezing pipes 5 and the vertical line of the subway tunnel 1 are distributed in parallel at a horizontal included angle of 10-30 ℃, the whole freezing pipes are arranged in parallel to the communication channel 2, and the freezing pipes 5 and the vertical line of the subway tunnel 1 are distributed in parallel at a horizontal included angle of 10-30 degrees based on the arrangement of the plane oblique crossing mode of the communication channel 2. The freezing holes 3 are divided into inner domain holes and outer domain holes, the inner domain holes are main freezing holes, and the outer domain holes are auxiliary freezing holes. The freezing curtain develops along the arrangement shape of the freezing hole 3, and the whole shape is trumpet-shaped. The subway tunnels 1 on two sides are provided with freezing calandria 6 along the periphery of the connecting channel 2, and the connecting channel 2 is provided with through holes 7 for cooling the calandria 6 and the freezing pipes 5. Two pairs of pressure relief holes 3 are symmetrically distributed in the middle of the communication channel 2 and used for relieving frost heaving pressure generated in the freezing process, and temperature measurement holes 8 distributed around the freezing area are used for monitoring the freezing effect of the freezing curtain in real time.
As shown in fig. 3, the arrangement of the freezing holes 5 of the communication channel 2 adjacent to the left line of the subway tunnel 1 surrounds the communication channel 2 in a rectangular distribution of the upper freezing holes, the lower freezing holes and the freezing holes at both sides. The upper freezing holes are divided into three layers, namely outer domain holes on the upper layer and inner domain holes on the lower layer, the inner domain holes on the lower layer are arranged in a quincuncial pile shape, the hole spacing of the upper freezing holes are the same, the lower freezing holes are divided into outer domain holes on the lower layer and inner domain holes on the upper layer, the hole spacing of the lower freezing holes is the same, and the hole spacing of the freezing holes on the two sides is the same.
Two pairs of through holes 7 are symmetrically distributed in the middle of two sides of the communication channel 2 adjacent to the left line of the subway tunnel 1, and the through holes 7 on the same side are arranged up and down. Four groups of temperature measuring holes 8 are symmetrically distributed in the middle of two sides of the communication channel 2, a group of temperature measuring holes with large span is arranged below the left side, a group of temperature measuring holes with small span is arranged above the right side, and the temperature measuring holes are distributed around the freezing hole 5.
As shown in fig. 4, the arrangement of the freezing holes 5 of the communication passage 2 adjacent to the right line of the subway tunnel 1 is a rectangular distribution of the upper freezing hole, the lower freezing hole and the freezing holes at both sides. The freezing holes at the upper part are divided into two layers, namely outer domain holes at the upper layer and inner domain holes at the lower layer, the hole spacing of the outer domain holes at the upper layer is the same as that of the inner domain holes at the lower layer, the freezing holes are arranged in a quincuncial pile shape, the freezing holes at the lower part are divided into the inner domain holes at the upper layer and the outer domain holes at the lower layer, the hole spacing of the inner domain holes at the upper layer is the same as that of the outer domain holes at the lower layer, and the hole spacing of the freezing holes at the two sides is the same.
Two pairs of through holes 7 are symmetrically distributed in the middle of two sides of the communication channel 2 adjacent to the right line of the subway tunnel 1, and the through holes 7 on the same side are arranged up and down. Six groups of temperature measuring holes are symmetrically distributed on two sides, one group is arranged around the freezing holes on the two sides of the connection channel, the other group is arranged around the freezing hole above the connection channel, the other group is arranged around the freezing hole below the connection channel, and the freezing effect of the freezing curtain is monitored through the temperature measuring holes.
The construction method of the communication freezing system based on the plane oblique crossing communication channel adopts the steps which are all known technologies in the field during the construction of the engineering, for example, the construction technology recorded in the application number of 202120926075.8 entitled 'freezing system for reinforcing 60-meter-level ultra-long distance communication channel by freezing method', and has the core that the optimum communication channel freezing Vickers freezing effect diagram is obtained based on finite element numerical model simulation theoretical analysis by combining the conditions to be constructed and the soil body performance, the construction of the actual engineering is carried out according to the optimum construction parameters, so that the control degree of the freezing effect is more accurate, the cold quantity supply in the actual engineering is saved, and the economy and the safety of the excavation construction are effectively improved. The method comprises the following specific steps:
(1) Freezing design is carried out according to construction conditions and soil body properties, and comprises the steps of determining the angle of a communication channel, the thickness of a freezing wall, the average temperature of the freezing wall, the flow rate of a freezing hole and the temperature of salt water, and designing a freezing pipe, a temperature measuring hole and a pressure relief hole;
(2) Establishing a finite element numerical model according to the design to simulate and obtain an optimal communication channel freezing Vietnamese freezing effect graph;
(3) And carrying out engineering implementation according to the freezing VIEW freezing effect diagram of the optimal communication channel.
Wherein, when the thickness of the frozen wall is designed, only the water stopping function is considered, and then the thickness of the frozen wall is designed according to the water stopping requirement; when the bearing capacity needs to be considered, the requirement of the bearing capacity needs to be considered when the thickness of the freezing wall is designed, the thickness of the freezing wall of the communication channel in the bell mouth opening section is more than 2.15m, and the thickness of the normal section of the channel is more than 2.4m.
The excavation depth of a foundation pit, the influence of frost heaving and thaw collapse on the surrounding environment and the load size of a frozen curtain to be born in the construction process are mainly considered when the average temperature of the frozen wall is designed.
Example 1
The formation in which the communication channel is arranged in the example 1 is mainly from top to bottom: mucky soil, silty clay (containing crushed stones), completely weathered granite porphyry, and strongly weathered granite porphyry (sandy soil). Wherein:
mucky soil: the color is dark gray, flowing plastic and saturated, sticky particles are used as main materials, a small amount of fine sand or thin-layer fine sand is mixed occasionally, the local part of the color contains rotten plant debris, the color has fishy smell, the shaking reaction is slow, the color is glossy, the twisted surface is smooth, and the dry strength and the toughness are moderate. Standard mean =2.5 after rod length correction. Suggested permeability coefficient values Kv =3.5E-07cm/s, KH =5.8E-06cm/s.
Powdery clay: the hard plastic is mainly light grey and gray yellow, is wet, contains a certain amount of broken stones and gravels, has different particle sizes of 2-100mm and uneven distribution, has the average content of more than 2mm of broken stones of about 10 percent, is not smooth enough on a twisted surface, has little luster, has no shake reaction, has relatively poor dry strength and toughness, poor viscosity and uneven soil quality. Standard mean =15.7 after rod length correction. The suggested permeability coefficient value K =3.5E-03cm/s.
Completely weathered granite: the rock core is light yellow, slightly wet and hard, contains feldspar and quartz speck grains, basically destroys the original rock structure, but can be identified, the rock core taking rate is more than 70 percent, the rock core is mainly in a scattered body shape, the content of the grains larger than 2mm is about 8.6 percent, and the rock core is easy to disintegrate when meeting water. It is the invasion of rock vein in later stage of Yanshan mountain. The hardness degree of the rock mass belongs to extremely soft rock, the integrity degree of the rock mass belongs to extremely broken rock, and the basic quality grade of the rock mass belongs to class V. Standard mean =27.3 after rod length correction. The suggested permeability coefficient value K =4.6E-04cm/s.
Strongly weathered granite (sandy soil): the rock core is light flesh color, light yellow and the like, is hard and slightly wet, contains feldspar and quartz porphyry crystals, is strongly weathered, most of the original rock tissue structure is weathered and damaged, the rock core is mostly sandy soil-shaped, the content of particles larger than 2mm is about 0.3%, the rock core is easily softened and disintegrated when meeting water, and the rock core taking rate is larger than 70%. The later stage of Yanshan mountain invades the diji. The hardness degree of the rock mass belongs to extremely soft rock, the integrity degree of the rock mass belongs to extremely broken rock, and the basic quality grade of the rock mass belongs to V class. Standard mean =40.6 after bar length correction. The suggested permeability coefficient value K =4.6E-04cm/s.
The soil body properties of the stratum soil body where the connection channel is located, including soil body freezing temperature, soil body specific heat and soil body heat conductivity coefficient are shown in the following tables 1 to 3.
TABLE 1 soil body freezing temperature
| Soil layer | Mucky soil | Powdery clay | Completely weathered granite | Strongly weathered granite porphyry |
| Freezing temperature/. Degree.C | -0.8 | -1.1 | -0.9 | -1.0 |
TABLE 2 specific heat of soil body
TABLE 3 soil body thermal conductivity
The freezing design is carried out according to the soil body properties, the freezing design comprises the wall thickness, the average freezing wall temperature, the freezing hole flow and the brine temperature, the freezing pipe, the temperature measuring hole and the pressure relief hole, and the obtained results are shown in the following table 4. Wherein the flow rate of the frozen Kong Shankong is more than or equal to 5m 3 H; actively freezing for 7 days at the temperature of saline less than or equal to-18 ℃; freezing for 15 days at the temperature of saline less than or equal to-24 ℃; the temperature of the brine is less than or equal to minus 28 ℃ during excavation, the temperature difference of the brine in the return circuit is not more than 2 ℃, and if the flow and the temperature of the brine cannot meet the requirements of a freezing scheme, the freezing time is prolonged.
The size of the freezing pipe is phi 89 multiplied by 8mm, the freezing pipe is made of low-carbon steel seamless steel pipe (GB 8163), and a butt welding joint with a lining pipe is adopted; after the joint is welded, cooling the welding line for 5-10 min, and then putting the freezing pipe into the stratum; the material of the welding rod is matched with that of the freezing pipe, when the freezing pipe falls into the stratum, the pressure of the freezing pipe needs to be tested, and the test pressure is 2 times of the salt water pressure of the freezing working surface and is more than or equal to 0.80MPa; after the pressure test is carried out for 30min, the pressure is reduced to be less than or equal to 0.05Mpa, and the pressure is not qualified after the pressure test is continued for 15 min. Totally, 12 temperature measuring pipes are arranged, including 4 ascending lines and 8 descending lines, each temperature measuring pipe is provided with 6-12 measuring points with different depths, the deflection angle of the temperature measuring pipe is calibrated when the temperature measuring pipe is arranged, the temperature measuring hole and the freezing hole can be parallel to the greatest extent, and meanwhile, the soil penetration depth of the temperature measuring hole needs to be strictly controlled.
Table 4 freezing parameter design
| Serial number | Parameter name | Unit of | Number of |
| 1 | Effective thickness of frozen earth wall | m | 2.4 |
| 2 | Average temperature of frozen earth wall | ℃ | ≤-13 |
| 3 | Frozen soil curtain circle-crossing time | Sky and sky | 23～28 |
| 4 | Positive freezing time | Sky | 45 |
| 5 | Design minimum brine temperature | ℃ | -28～-30 |
According to the design, a finite element numerical model simulation is established according to the design, and when the contact channel 2 is obtained to be 18.1 degrees with the horizontal direction during simulation, and the freezing pipes 5 are distributed at 18.1 degrees with the vertical line of the subway tunnel 1, the freezing effect of the freezing curtain is the best, as shown in fig. 5 to 9. And finally, carrying out engineering application according to the effect diagram.
Claims (8)
1. The utility model provides a intercommunication system of freezing based on plane skew connection passageway, includes a pair of subway tunnel (1), its characterized in that: the freezing system further comprises a connection channel (2) which is communicated with the subway tunnel (1) and is arranged at 10-30 degrees with the horizontal direction, pressure relief holes (3) which are arranged at the center of the connection channel (2) and used for releasing freezing pressure, and freezing holes (4) which are distributed on the periphery of the connection channel (2), wherein freezing pipes (5) are arranged in the freezing holes (4), the freezing pipes (5) and the vertical line of the subway tunnel (1) are distributed in parallel at a horizontal included angle of 10-30 ℃, a horn-shaped freezing curtain is formed on the periphery of the freezing holes (3), a freezing calandria (6) is arranged on the subway tunnel (1) along a freezing curtain on the periphery of the connection channel (2), and through holes (7) which are convenient for cooling the freezing pipes (5) and the freezing calandria (6) are arranged on the connection channel (2).
2. The planar skew communication channel-based communication freezing system according to claim 1, wherein: the communication channel (2) is arranged at an angle of 18.1 degrees to the horizontal direction.
3. The planar skew communication channel-based communication freezing system according to claim 1, wherein: the freezing pipes (5) and the vertical line of the subway tunnel (1) are distributed in parallel at a horizontal included angle of 18.1 degrees.
4. The planar skew communication channel-based communication freezing system according to claim 1, wherein: the freezing system also comprises temperature measuring holes (8) which are arranged around the freezing area and used for monitoring the temperature field of the freezing veiling in real time.
5. The planar skew communication channel-based communication freezing system according to claim 1, wherein: the freezing holes (3) of the communication channel (2) adjacent to the left line of the subway tunnel (1) comprise upper freezing holes with the same hole spacing, lower freezing holes with the same hole spacing and two side freezing holes with the same hole spacing; the upper freezing hole comprises an outer domain hole on the upper layer and two layers of inner domain holes on the lower layer, the inner domain holes on the lower layer are arranged in a quincuncial pile shape, and the lower freezing hole comprises an outer domain hole on the lower layer and an inner domain hole on the upper layer;
the freezing holes (3) of the communication channel (2) adjacent to the right line of the subway tunnel (1) comprise an upper freezing hole, a lower freezing hole and two side freezing holes with the same hole spacing; the upper freezing holes comprise outer domain holes of an upper layer and inner domain holes of a lower layer which are arranged in a quincuncial pile shape, and the hole spacing of the outer domain holes of the upper layer is the same as that of the inner domain holes of the lower layer; the freezing holes at the lower part comprise outer domain holes of the lower layer and inner domain holes of the upper layer, and the hole intervals of the inner domain holes of the upper layer and the outer domain holes of the lower layer are the same.
6. The planar skew communication channel-based communication freezing system according to claim 1, wherein: two pairs of through holes (7) are symmetrically distributed in the middle of two sides of the communication channel (2) adjacent to the left line and the right line of the subway tunnel (1), and the through holes (7) on the same side are arranged up and down.
7. The interconnected freezing system based on plane skew communication channel as claimed in claim 4, wherein: four groups of temperature measuring holes (8) are symmetrically arranged in the middle of two sides of the connecting channel (2) adjacent to the left line of the subway tunnel (1), and six groups of temperature measuring holes (8) are symmetrically arranged in the middle of two sides of the connecting channel (2) adjacent to the right line of the subway tunnel (1).
8. The construction method of the communication freezing system based on the plane skew connection channel as claimed in claim 1, which is characterized by comprising the following steps:
(1) Freezing design is carried out according to construction conditions and soil body properties, and the freezing design comprises freezing wall thickness, freezing wall average temperature, freezing hole flow and brine temperature, freezing pipes, temperature measuring holes and pressure relief holes;
(2) Establishing a finite element numerical model according to the design to simulate and obtain an optimal communication channel freezing veiling freezing effect graph;
(3) And carrying out engineering implementation according to the freezing VIEW freezing effect diagram of the optimal communication channel.
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