A method for line and site selection of urban long-distance deep-buried water transfer tunnel projects

Abstract

The present invention discloses a method for selecting a route and site for a long-distance, deeply buried urban water tunnel project. The method establishes a three-dimensional database of location information of underground and surface buildings in the project area and location information of government management and protection areas, and determines optional and non-optional areas for the project in the three-dimensional database. The management and protection areas designated by government departments and locations with geological hazards are non-optional areas. According to the starting point and end point of the water tunnel, a preliminary route for laying the water tunnel connecting the starting point and the end point is designed in the optional areas of the three databases. The water tunnel is laid in a rock layer 50m below the ground. The burial depth or direction of a local position of the water tunnel is adjusted according to a safe distance L between the water tunnel and intersecting buildings. The present invention solves the problem of spatial conflict between the water tunnel and existing underground pipelines, municipal transportation, surface buildings, etc. by deeply burying the water tunnel, reduces the difficulty of project approval and construction application, and pipeline relocation, and releases valuable surface and shallow underground space.

Description

Technical Field

[0001] The present invention relates to the field of urban long-distance deep-buried water supply tunnel engineering survey and design, and in particular to a method for urban long-distance deep-buried water supply tunnel engineering line selection and site selection based on multivariate spatiotemporal data collaboration. Background Art

[0002] With the rapid development of urbanization and a sharp increase in population, urban water demand for production and domestic use is increasing, and the spatial and temporal imbalance of water resources is becoming increasingly prominent. New water transfer projects have become a key measure to address the imbalance between urban water supply and demand and improve the water resource allocation system. Existing urban water transfer projects mostly use open channels or shallow buried pipelines. These projects require a significant amount of valuable surface and shallow space, inevitably creating spatial conflicts with existing underground pipelines for water, electricity, gas, and communications, as well as municipal transportation and surface buildings and structures. This makes approval, construction, and land acquisition coordination challenging.

[0003] Furthermore, due to the length of their routes, long-distance urban water transfer projects must draw water from specific supply areas, such as reservoirs, and deliver water to specific receiving areas, such as water plants. These projects inevitably traverse areas with complex hydrogeology, high exploration risks, stringent environmental requirements, and strong acoustic, magnetic, and electrical interference. This presents significant challenges in the route selection, site selection, and survey and design of these projects. The "three zones and three lines" (ecological space, agricultural space, urban space, permanent basic farmland control lines, ecological protection red lines, and urban development boundaries) have been largely delineated and approved by the Ministry of Natural Resources in all provinces and regions nationwide. The national land use control zoning has been largely finalized, and the national government has clearly defined the use of each space. These zones cannot be arbitrarily altered or violate planning regulations. Failure to carefully consider the survey and design process, such as encroaching on ecological red lines or sensitive areas, could slow project progress or even stall the project. Therefore, the boundary conditions faced in the route selection, site selection, and survey and design of long-distance urban water transfer projects are extremely complex.

[0004] At the same time, the route and site selection of long-distance urban water transmission projects often rely on a single survey and design approach. Traditional survey and design methods often require extensive on-site work, requiring significant manpower and material resources. This results in long and inefficient survey and design cycles for water transmission lines, hindering the construction and development of water transmission projects. Existing methods for water transmission project route and site selection fail to effectively and accurately consider complex boundary conditions and sensitive factors. They struggle to balance the complex hydrogeological conditions and interference from various intersecting buildings or structures encountered during the route and site selection process, making it difficult to determine the most economically reasonable and efficient project layout. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for selecting the route and site of a long-distance, deeply buried urban water tunnel project, so as to solve the problems that the laying of existing water tunnels requires a large amount of valuable surface and shallow space resources, and that the laying of existing water tunnels conflicts with existing underground pipelines such as water supply, power supply, gas, and communications, as well as municipal transportation, surface buildings or structures, and that the approval, construction, and land acquisition coordination are difficult.

[0006] To achieve the above objectives, the technical solution of the present invention is:

[0007] A method for selecting a route and site for a long-distance, deep-buried urban water diversion tunnel project comprises the following steps:

[0008] S1: Obtaining topographic data of the project area and location data of underground and surface buildings in the project area, and establishing a three-dimensional database of the project area based on the data. The three-dimensional database includes location information of underground and surface buildings in the project area, location information of government management areas, and geological and geomorphological information. The location information includes elevation data and three-dimensional coordinate data recorded by a three-dimensional coordinate system;

[0009] S2: Determine the project selectable area and the project non-selectable area in the three-dimensional coordinate system based on the management and protection scope of the government department. The management and protection scope designated by the government department and the location with geological hazards are the project non-selectable areas;

[0010] S3: Based on the starting point and the end point of the water tunnel, design a preliminary route for laying the water tunnel connecting the starting point and the end point in the optional project area in the three-dimensional coordinate system, wherein the preliminary route is the shortest route connecting the starting point and the end point in the optional project area, and the water tunnel is laid in the rock layer 50 m below the ground;

[0011] S4: S4: Adjust the preliminary route to obtain the engineering route for laying the water transfer tunnel. Adjusting the preliminary route means adjusting the burial depth or direction of the local position of the water transfer tunnel according to the safety distance L between the water transfer tunnel and the intersecting building. The safety distance L refers to the minimum distance between the water transfer tunnel and the intersecting building, and the local position refers to the part of the water transfer tunnel closest to the intersecting building.

[0012] Furthermore, the safety distance L between the water tunnel and the intersecting buildings should be greater than the damage area r0 caused by tunnel construction and the minimum safety distance L required by the regulations and rules for the protection of intersecting buildings. g ,Right now:

[0013] L≥max(r0,L g )

[0014] By comparing the plastic damage zone r0 of the water transfer tunnel and the minimum value L required by the regulations and rules for the protection of cross-buildingsg , the safety distance L should be greater than or equal to the larger value of r0 and L g in, and then determine the burial depth of the space intersection part of the water conveyance tunnel and the building.

[0015] Further, the determination method of the damage failure zone r0 caused by the tunnel construction is calculated according to formula (14),

[0016]

[0017] where: r a is the excavation radius of the tunnel; m b and s are Hoek-Brown empirical parameters; q is the initial stress; σ ci is the uniaxial compressive strength of the rock mass.

[0018] Further, the method for obtaining the topographic and geomorphic features of the project area and the position data of underground and surface buildings in the project area in the S1 step includes obtaining the topographic and geomorphic features, water bodies, vegetation distribution, underground pipelines, and geographical location data of surface municipal transportation, high-speed railways, and housing buildings in the project area through microtremor detection, UAV three-dimensional oblique photography, ground-penetrating radar detection, and three-dimensional laser scanning, and recording the position data in a three-dimensional coordinate system.

[0019] Further, the economic flow velocity range of the water conveyance tunnel pipeline is 0.6~1.5m / s. When 100mm < d < 400mm, V = 0.6~0.9m / s; when d > 400mm, V = 0.9~1.4m / s, where:

[0020]

[0021] In the formula: d is the inner diameter of the pipeline; Q is the calculated flow rate of the water conveyance pipe, m 3 / s; V is the economic flow velocity of the pipeline, m / s.

[0022] The beneficial effects of the present invention are:

[0023] 1. By adopting the water conveyance method of a deep-buried tunnel and arranging the water conveyance line in the rock stratum below 50m, it can effectively reduce and avoid spatial conflicts with existing underground pipelines such as water supply, power supply, gas, and communication, as well as municipal transportation and surface buildings, greatly reducing the difficulties of approval, pipeline relocation, and approval coordination, and effectively releasing valuable surface and shallow underground spaces.

[0024] 2. With the help of technical means such as micro-motion detection, drone 3D oblique photography, geological radar detection, and 3D laser scanning, relevant information of the project area can be efficiently obtained, avoiding the problems of traditional manual survey and design methods that require a lot of manpower and material resources, long work cycle, and low efficiency. It can also effectively deal with problems such as complex hydrogeology along the water transfer project, high exploration operation risks, high environmental requirements, and strong acoustic, magnetic and electrical interference.

[0025] 3. The integration and collaborative processing of multivariate spatiotemporal data within the project scope effectively resolves the various complex boundary conditions encountered in the line selection and site selection process, facilitating the determination of the optimal line selection and site selection plan.

[0026] 4. The safety of the water diversion tunnel itself and the intersecting buildings (structures) are comprehensively considered, which is conducive to the efficient and stable operation of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Flowchart of collaborative integration of multi-dimensional spatiotemporal data for route and site selection of urban long-distance water diversion tunnel projects.

[0028] Figure 2 Flowchart of the preliminary proposed route and site selection plan for the urban long-distance water diversion tunnel project.

[0029] Figure 3 Flowchart of the optimal comprehensive investment and benefit plan for line and site selection of urban long-distance water diversion tunnel projects.

[0030] Figure 4 Schematic diagram of a 3D database considering multivariate spatiotemporal data for long-distance urban water diversion tunnel projects.

[0031] Among them: 1 intersection building; 2 hydrogeological information; 3 sensitive area red lines; 4 water diversion tunnels. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the invention clearer, the present invention is further described below with reference to the accompanying drawings.

[0033] The relevant terms of the present invention are described as follows:

[0034] Urban deep tunnels: Generally, underground depths of 0-10m are considered shallow, 10-30m are considered sub-shallow, 30-50m are considered sub-deep, and depths greater than 50m are considered deep underground space. To preserve surface and shallow underground space resources, the urban deep water transmission tunnels covered in this application generally refer to tunnel projects greater than 50m.

[0035] Three zones and three lines: refers to the three control lines corresponding to the three areas of agricultural space, ecological space, and urban space, namely the cultivated land and permanent basic farmland protection red line, the urban development boundary, and the ecological protection red line.

[0036] Constitutive model: also known as the mechanical constitutive equation of the material, or the stress-strain model of the material, is a mathematical expression that describes the stress-strain-strength-time relationship of the mechanical properties of the material.

[0037] Economic flow rate: the minimum flow rate of the sum of the construction cost and operation and maintenance costs of the tunnel pipeline within a certain number of years.

[0038] like Figure 1 As shown, the present invention is a method for line and site selection of urban long-distance deep-buried water tunnel projects based on the collaboration of multivariate spatiotemporal data. Specifically, the traditional open channel water supply and shallow buried pipeline water supply design concepts are changed, and the water supply method of deep buried tunnels is adopted. The water tunnels are arranged in rock layers below 50m. With the help of micro-motion detection, drone three-dimensional oblique photography, geological radar detection, three-dimensional laser scanning and other technical means, the topography, water bodies, vegetation distribution, water supply, power supply, gas, communication and other underground pipelines and surface municipal transportation, high-speed rail, housing construction and other data of the project area are efficiently obtained. At the same time, the "three zones and three lines" provided by the relevant departments of land and resources, as well as the building (structure) protection range lines provided by various administrative departments are used to determine environmentally sensitive areas, planning red lines, etc., and limit the boundaries of construction approval, land use planning, line and site selection engineering planning and design. By processing and integrating the data, it can be obtained through human The system makes judgments, eliminates erroneous information and invalid data, converts spatial geographic data from various sources and projections into the 2000 National Geodetic Coordinate System and the 1985 National Elevation System for storage, quickly establishes the three-dimensional environment of the water transmission line area, comprehensively and accurately obtains the plane information, elevation information and real-life status of the topography and landforms in the water transmission line area, and constructs a three-dimensional database. The three-dimensional database is a multivariate spatiotemporal database and a three-dimensional geographic environment information database. The three-dimensional database includes the location information of underground and surface buildings in the project area, the location information of the government management area, and geological and geomorphological information. The location information includes three-dimensional coordinate data and elevation data. Regarding geological and geomorphological information, for example, river information includes the coordinate position, geological information, depth, soil layer, etc. of the river.

[0039] The three-dimensional database is used to carry out route and site selection comparison and economic analysis of water transfer projects, preliminarily formulate line layout plans, and construct a three-dimensional analysis structure model of the water transfer project considering multivariate spatiotemporal data. The safety of the water transfer project itself and the intersecting buildings (structures) along the line are analyzed to determine the final route and site selection plan for the water transfer project.

[0040] The layout concept of deep-buried water transfer tunnels facilitates the reservation of safe space, fully releasing valuable surface and shallow underground resources, reducing and avoiding spatial conflicts with existing underground pipelines such as water supply, power supply, gas, and communications, as well as municipal transportation and surface buildings, and reducing the difficulty of application for approval, pipeline relocation, and approval coordination.

[0041] The layout of the water diversion tunnel is based on the minimum environmental impact of the project setting, including avoiding environmentally sensitive areas, building complexes, and approval within the validity period of the land use; good land use coordination includes avoiding planning red lines and no property rights disputes; fewer approval and construction procedures include pipeline relocation, traffic diversion, road occupation approval, safe crossing of intersecting buildings, and meeting safety distance and management scope requirements.

[0042] See Figure 2 It can be seen that after the multivariate spatiotemporal data are acquired, data processing is performed to eliminate erroneous and useless information, the multivariate spatiotemporal data are fused, and a multivariate spatiotemporal database is constructed to obtain a three-dimensional database of the project area based on the multivariate spatiotemporal data.

[0043] The three-dimensional database is established based on the 2000 National Geodetic Coordinate System. The three-dimensional database includes the topography of the project area, the three-dimensional coordinate system of each building in the project area and elevation data.

[0044] Determine the optional and non-optional areas for the project, and then preliminarily formulate the line and site selection plan in the optional areas for the project.

[0045] See Figure 3 and Figure 4 It can be seen that using the multivariate spatiotemporal database and the preliminary proposed line and site selection scheme, a three-dimensional database of the water transfer project was constructed, which took into account hydrogeological information 2, intersecting buildings 1, and sensitive area red lines 3 (such as underground pipelines, subways, roads, ground bridge pile foundations, houses, etc.). Structural stability analysis was carried out, and the line layout of the water transfer tunnel 4 was adjusted based on the structural analysis results to determine the scheme with the least environmental impact, good land use coordination, fewer approval and construction procedures, safe intersecting buildings, and the best overall investment benefits.

[0046] In order to make up for the fact that traditional open channel water supply projects and shallow buried water supply pipeline projects need to occupy a large amount of precious surface and shallow space resources, the approval and construction, and land acquisition coordination are difficult, the traditional urban water supply project survey and design methods require a lot of manpower and material resources, the survey and design cycle is long, the efficiency is low, the line selection and site selection methods cannot efficiently and accurately consider the complex boundary conditions and sensitive factors of the project, and it is difficult to coordinate the various cross-building (structure) interferences faced in the line selection and site selection process. A series of defects and deficiencies, the present invention provides a line selection and site selection method for urban long-distance deep buried water supply tunnel projects based on multivariate spatiotemporal data collaboration, adopts the water supply method of deep buried tunnels, arranges the water supply line in the rock layer below 50m, and uses micro-motion detection, UAV three-dimensional oblique photography, geological radar detection, and three-dimensional radar detection to detect the water supply line. By using technical means such as 3D laser scanning, we can efficiently obtain data on the topography, water bodies, vegetation distribution, underground pipelines such as water supply, power supply, gas, and communications in the project area, as well as surface municipal transportation, high-speed rail, and housing construction. At the same time, we use the "three zones and three lines" provided by the relevant land and resources departments, as well as the building (structure) protection scope lines provided by various administrative units, to process and integrate the data, eliminate erroneous information and invalid data, and convert spatial geographic data from various sources and projections into the 2000 National Geodetic Coordinate System and the 1985 National Elevation System for storage. We can quickly establish a three-dimensional environment for the water transmission line area, comprehensively and accurately obtain the plane information, elevation information, and real-life status of the topography and land features in the water transmission line area, and build a multi-dimensional spatiotemporal database and a three-dimensional geographic environment information database. The multivariate spatiotemporal database and three-dimensional geographic environment information database are used to carry out water transfer project route and site selection comparison and economic analysis, preliminarily formulate a water transfer project line layout plan, and construct a three-dimensional stability analysis structural model of the water transfer project considering multivariate spatiotemporal data. The safety of the water transfer project and the intersecting buildings (structures) along the line are analyzed to determine the final water transfer project route and site selection plan.

[0047] This method, based on the collaborative use of multivariate spatiotemporal data, addresses the route and site selection of long-distance, deep-buried urban water supply tunnel projects. This method addresses long-distance urban water supply projects typically located at depths greater than 50 meters, where the rock mass has relatively uniform hydrogeological characteristics, facilitating project safety and excavation progress. Furthermore, deep-buried water supply tunnels are designed to maintain a sufficient safety distance (L) from intersecting structures by adjusting their depth and layout.

[0048] The safety distance L between the water conveyance tunnel and the intersecting buildings should be greater than the damage zone r0 caused by tunnel construction and the minimum safety distance L required by the regulations and rules for the protection of intersecting buildings (structures). g ,Right now:

[0049] L≥max(r0,L g ) (1)

[0050] The safety distance L value is set to ensure that a sufficient safety distance is reserved between the water conveyance tunnel and existing and planned intersecting buildings, so as to ensure the safe passage of the water conveyance tunnel underground.

[0051] The damage zone r0 of long-distance tunnel is determined as follows:

[0052] When excavating a long tunnel in rock mass, the stress in the elastic zone of the surrounding rock refers to the plane strain axisymmetric result:

[0053]

[0054]

[0055] Where: q is the initial stress;

[0056] σ re ,σ te It is the radial normal stress and circumferential normal stress in the elastic zone of the surrounding rock after excavation;

[0057] is the radial normal stress at radius r0.

[0058] r a and r0 are respectively the tunnel excavation radius and the damage zone radius. a <r<r0), obtained by the Hoek-Brown empirical criterion

[0059]

[0060] Where: σ rp ,σ tp They are radial normal stress and circumferential normal stress in the damaged area of ​​surrounding rock after excavation;

[0061] σ ci is the uniaxial compressive strength of rock mass;

[0062] m b , α and s are Hoek-Brown empirical parameters.

[0063] The stress equilibrium equation in the plastic damage zone can be expressed as

[0064]

[0065] Where d is the derivative, r is the radius; r is the radius

[0066] Substituting formula (3) into formula (4) we can get

[0067]

[0068] Integrate equation (5) and introduce boundary conditions. When r = r aWhen σ rp =0, then

[0069]

[0070]

[0071] At the interface between the elastic zone and the plastic damage zone (r = r0):

[0072] σ re +σ re =σ rp +σ tp ;

[0073]

[0074] Combining equations (3) and (7), we can get

[0075] Wherein the Hoek-Brown empirical parameter is:

[0076]

[0077]

[0078]

[0079] Where G is the geological strength index GSI value, which represents the degree of rock fragmentation; m i It is an empirical constant that characterizes the degree of weakness of the rock mass and can be obtained through reference books.

[0080] D is a parameter that characterizes the degree of disturbance during rock excavation, and 0≤D≤1. The larger the disturbance parameter, the more severe the excavation disturbance and the larger the plastic damage zone of the surrounding rock. exp is an exponential function with the natural constant e as the base.

[0081] The strength parameter α≈0.5, and the combined equations (7) and (8) give the radius of the plastic damage zone:

[0082]

[0083] By comparing the plastic damage zone r0 of the water diversion tunnel and the minimum value L required by the regulations and rules for the protection of cross-buildings (structures), g , preliminarily determine the tunnel burial depth.

[0084] Minimum value L required by regulations and rules for the protection of crossing buildings (structures) g The values ​​for different structures are different. The minimum clearance between water tunnels and buildings, railways and other pipelines is L gIt should be determined based on the building foundation structure, road type, sanitary and safety conditions, buried depth of cross pipes, pipe diameter, pipe material, construction conditions, working pressure inside the pipe, and the size of auxiliary structures on the pipeline. Generally, it can be 2 to 3 times the diameter of the water diversion tunnel.

[0085] With the help of technical means such as micro-motion detection, three-dimensional oblique photography by drones, geological radar detection, and three-dimensional laser scanning, the present invention can efficiently obtain data on the topography, water bodies, vegetation distribution, underground pipelines such as water supply, power supply, gas, and communications, as well as surface municipal transportation, high-speed railways, and housing construction in the project area, quickly establish the three-dimensional environment of the water transmission line area, and comprehensively and accurately obtain the plane information, elevation information, and real-scene status of the topography and landforms in the water transmission line area. By integrating these data with the "three zones and three lines" provided by the relevant land and resources departments, and the building (structure) maintenance scope lines provided by various administrative departments, a multi-dimensional spatiotemporal database and a multi-dimensional spatiotemporal database with a unified coordinate and elevation system and a three-dimensional geographic information database are formed.

[0086] Technical means such as micro-motion detection, drone 3D oblique photography, geological radar detection, and 3D laser scanning can effectively solve and respond to problems faced by the survey and design of urban long-distance water transfer tunnel projects, such as complex hydrogeology, high exploration operation risks, high environmental requirements, and strong acoustic, magnetic and electrical interference.

[0087] Microseismic detection, rather than using artificial seismic sources, utilizes the natural, weak vibrations present in the Earth's surface, such as those from moving vehicles and machinery, to collect data. Microseismic exploration can be adapted to different exploration depths, requiring different instrument placements for different site conditions. Prior to large-scale application, this technology was tested near the Yulü Fault Zone in the Luotie Project area, effectively identifying the distribution of hidden faults and deep weathering troughs. This led to its widespread application in long-distance tunnel surveys.

[0088] Using UAV three-dimensional oblique photogrammetry technology, the three-dimensional environment of the water transmission line area is quickly established, and the plane information, elevation information and real-scene status of the terrain and objects in the water transmission line area are comprehensively and accurately obtained to establish a three-dimensional coordinate system including geographic information.

[0089] The multivariate spatiotemporal database and three-dimensional geographic information database need to be preprocessed to eliminate erroneous and useless information, unify spatial data from various sources and projections, and determine the optional and unoptional areas for the project. The optional areas for the project are target areas where line selection and site selection can be set, and the unoptional areas are target areas where line selection and site selection cannot be arranged.

[0090] Carry out route comparison and economic benefit analysis for the optional project area (target area), and preliminarily formulate the route selection and layout plan for the water transfer project.

[0091] According to the preliminary routing layout plan of the water conveyance project, a three-dimensional stability analysis model of the water conveyance project considering multi-source spatio-temporal data is constructed to study and analyze the safety of cross-structures and the water conveyance tunnel itself, and adjust the preliminary project layout.

[0092] Using the three-dimensional stability analysis model of the water conveyance project, analyze the stability of the water conveyance project structure and various cross-influence factors (such as underground pipelines, subways, roads, pile foundations of ground bridges, houses, etc.), and refine the optional area into an unstable area and a stable area according to the structural safety and stability of the optional area (target area).

[0093] Optimize and adjust the route selection and site selection plan of the water conveyance project according to the structural safety and stability zoning of the optional area (target area).

[0094] The division of the stable area in the three-dimensional structural safety and stability analysis should also consider the safety distance L between the water conveyance tunnel and the cross-structure, ensuring that the layout of the water conveyance line complies with relevant regulations, laws and theoretical calculation results.

[0095] For the route selection and site selection plan of the urban deep-buried water conveyance tunnel project, the selection of the tunnel diameter of the water conveyance tunnel needs to consider the economic flow velocity. The range of the pipeline economic flow velocity set in this invention is 0.6 - 1.5 m / s. When it exceeds the above range, it should be determined through technical and economic comparison or redesigned. The selection of the economic flow velocity can refer to the following empirical values:

[0096] When 100mm < d < 400mm, V = 0.6 - 0.9 m / s;

[0097] When d > 400mm, V = 0.9 - 1.4 m / s

[0098]

[0099] In the formula:

[0100] d is the inner diameter of the pipeline, m. The nominal diameter of the metal pipe is the inner diameter, and the nominal diameter of the plastic pipe is the outer diameter (including the wall thickness);

[0101] Q is the calculated flow rate of a water conveyance pipe, m 3 / s;

[0102] V is the economic flow velocity of the pipeline, m / s.

[0103] For the route selection and site selection plan of the water conveyance project, the plane turning radius and longitudinal slope ratio of the tunnel need to meet the requirements of equipment construction during the construction period, water conveyance during the operation period, and drainage during the maintenance period, and avoid excessive undulation of the longitudinal slope of the tunnel as much as possible. The plane turning radius of the tunnel is generally taken as 300m, and the longitudinal slope ratio of the tunnel is generally not less than 1%.

[0104] Finally, it should be noted that the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A method for selecting a route and site for a long-distance, deep-buried urban water diversion tunnel project, characterized in that: It includes the following steps: S1: Obtain the topographic and geomorphic data of the project area and the location data of underground and surface buildings in the project area, and establish a three-dimensional database of the project area through the data. The three-dimensional database includes the location information of underground and surface buildings in the project area, the location information of the government management scope, and the geological and geomorphic information. The location information includes elevation data and three-dimensional coordinate data recorded by a three-dimensional coordinate system; S2: Combine the management scope of the government department to determine the project optional area and the project non-optional area in the three-dimensional coordinate system. The management scope delimited by the government department and the locations with geological hazards are the project non-optional areas; S3: According to the starting point and the ending point of the water conveyance tunnel, design a preliminary route for laying the water conveyance tunnel connecting the starting point and the ending point in the project optional area in the three-dimensional coordinate system. The preliminary route is the shortest route connecting the starting point and the ending point in the project optional area. The water conveyance tunnel is laid in the rock stratum below 50 m of the ground; S4: Adjust the preliminary route to obtain the project route for laying the water conveyance tunnel. Adjusting the preliminary route means adjusting the burial depth or the trend of the local position of the water conveyance tunnel according to the safety distance L between the water conveyance tunnel and the cross-building. The safety distance L refers to the minimum distance between the water conveyance tunnel and the cross-building. The local position refers to the part of the water conveyance tunnel closest to the cross-building; The safety distance L between the water tunnel and the intersecting buildings should be greater than the damage area r0 caused by tunnel construction and the minimum safety distance L required by the regulations and rules for the protection of intersecting buildings. g ,Right now: L≥max(r0,L g ) (1) By comparing the plastic damage zone r0 of the water transfer tunnel and the minimum value L required by the regulations and rules for the protection of cross-buildings g , the safety distance L should be greater than or equal to r0 and L g The larger value of is used to determine the buried depth of the intersection between the water diversion tunnel and the building space.

2. The method for selecting a route and site for a long-distance, deep-buried urban water diversion tunnel project according to claim 1, characterized in that: The determination method of the damage and failure area r0 caused by the tunnel construction is calculated according to formula (14); Where: r a is the tunnel excavation radius; m b and s are Hoek-Brown empirical parameters; q is the initial stress; σ ci is the uniaxial compressive strength of rock mass.

3. The method for selecting a route and site for a long-distance, deep-buried urban water diversion tunnel project according to claim 1, characterized in that: The method for obtaining the topographic and geomorphic data of the project area and the location data of underground and surface buildings in the project area in step S1 includes obtaining the topographic and geomorphic data of the project area, the distribution of water bodies and vegetation, the geographical location data of underground pipelines and surface municipal transportation, high-speed railways, and housing buildings through microtremor detection, UAV three-dimensional oblique photography, ground-penetrating radar detection, and three-dimensional laser scanning, and recording the location data in a three-dimensional coordinate system; 4. The method for selecting a route and site for a long-distance, deep-buried urban water diversion tunnel project according to claim 1, characterized in that: The economic flow velocity range of the water conveyance tunnel pipeline is 0.6 - 1.5 m / s. When 100 mm < d < 400 mm, V = 0.6 - 0.9 m / s; when d > 400 mm, V = 0.9 - 1.4 m / s, where: Where: d is the inner diameter of the pipe; Q is the calculated flow rate of the water pipe, m 3 / s; V is the economic flow velocity of the pipeline, m / s.

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