Permanent and temporary combined rapid comprehensive safety treatment method for shallow tunnel in deep polluted soil area

Abstract

The invention discloses a permanent and temporary combined deep polluted soil area shallow tunnel rapid comprehensive safety treatment method which comprises the following steps: 1, defining a polluted soil plane treatment boundary in a polluted soil area, and defining a horizontal tunnel structure boundary of an enclosure structure of a to-be-built tunnel; 2, the vertical treatment range of the polluted soil area and the excavation bottom boundary of a foundation pit of the tunnel to be built are determined; 3, the foundation pit is excavated, and a supporting structure comprising a convex structural beam is built in the excavation process; 4, a cushion layer, a waterproof layer and a tunnel structure bottom plate of the to-be-built tunnel are sequentially constructed upwards in a layered mode from the pit bottom where soil backfilling is completed; all the convex structural beams are embedded below the tunnel structure bottom plate. According to the method, more effective utilization of resources is achieved, the construction efficiency can be improved, the construction risk can be reduced, meanwhile, the construction process of the deep pollution area is effectively managed, and remarkable economic benefits and social values are achieved.

Description

Technical Field

[0001] The invention relates to the technical fields of civil engineering and environmental engineering, and in particular to a comprehensive safety management method for rapid shallow tunneling in a deep contaminated soil area combined with permanent and temporary facilities. Background Art

[0002] In the process of urbanization and industrialization, land resources have become increasingly scarce, and many engineering projects have to be carried out in seriously polluted land areas. These areas are often deeply affected by pollutants such as industrial waste, heavy metals, and organic compounds. Especially for shallow tunnel projects, the environmental and safety issues faced during construction are particularly prominent.

[0003] Traditional shallow tunnel construction technology often has many challenges and shortcomings when dealing with deeply contaminated soil. Generally, treatment methods can be divided into two categories: one is permanent measures, which can provide long-term and stable treatment effects, but their construction is complex, costly and time-consuming; the other is temporary measures, which are convenient to construct and low in cost, but cannot provide long-term safety guarantees and are prone to secondary pollution and environmental risks.

[0004] The shortcomings of these methods often lead to problems such as the spread of environmental pollution, extended construction periods, increased occupational health risks, and insufficient engineering stability when constructing shallow tunnels in deeply polluted land areas. In addition, traditional governance methods do not adequately balance construction safety and environmental protection, and lack comprehensive and systematic solutions.

[0005] In view of this, how to effectively deal with the complexity of deeply contaminated soil while speeding up the construction progress, improving the treatment efficiency, and ensuring the safety and stability of construction and long-term use has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a comprehensive safety management method for rapid shallow tunnels in deeply contaminated soil areas that combines permanent and temporary management methods. The purpose of the method is to effectively improve the construction speed of tunnels and underground engineering projects in deeply contaminated soil areas such as industrial waste land, heavy metal pollution areas, and former chemical plant sites by combining permanent and temporary management measures, and to ensure safety and stability during construction and subsequent use.

[0007] To achieve the above-mentioned purpose, the present invention discloses a comprehensive safety management method for rapid shallow tunnel construction in deep contaminated soil areas, which is combined with permanent and temporary construction, and is used for rapid construction of shallow tunnels in deep contaminated areas, and comprises the following steps:

[0008] Step 1: Define the horizontal boundary of the contaminated soil treatment in the contaminated soil area and define the horizontal boundary of the tunnel structure of the retaining structure of the tunnel to be built;

[0009] Step 2: determining the vertical treatment range of the contaminated soil area and the bottom boundary of the foundation pit excavation of the tunnel to be built; the bottom boundary of the foundation pit excavation is determined according to the treatment boundary of the contaminated soil depth and the unfavorable value of the bottom boundary of the foundation pit excavation of the tunnel to be built;

[0010] Step 3, digging the foundation pit, and building a supporting structure during the excavation process, and then digging to the foundation step 3, digging the foundation pit, and building a supporting structure during the excavation process;

[0011] The support structure is provided with convex structural beams which are evenly distributed in the width direction and the length direction below the tunnel structure bottom plate and cross-shaped in a grid shape at a position corresponding to the tunnel structure bottom plate which has not been built yet;

[0012] The elevations of all the convex structural beams uniformly distributed along the width direction of the tunnel structure floor are grouped in groups and sequentially lowered or raised, and each of the convex structural beams is provided with a plurality of circular protruding structures along the length direction on the upper side of the tunnel structure floor;

[0013] Step 4: After excavating to the bottom of the foundation pit, conduct a contaminated soil compliance test. If the soil is qualified, backfill the soil to an elevation that meets the requirements for building the tunnel structure floor, and simultaneously remove the support structure except for the convex structural beam;

[0014] If the soil fails the compliance test, it is necessary to continue digging to the qualified soil boundary;

[0015] Step 5, constructing a cushion layer, a waterproof layer and a tunnel structure bottom plate of the tunnel to be built in layers from the bottom of the pit where the backfill soil is completed upward;

[0016] All the convex structural beams are buried under the tunnel structure bottom plate, and the bottom is in a stepped shape that matches all the convex structural beams evenly distributed along its width direction, forming a sawtooth bottom edge in the cross section, forming a concrete layer with a thickness that meets the minimum waterproofing requirement with all the convex structural beams that cross vertically and horizontally in a grid shape below.

[0017] Preferably, step 1 is as follows:

[0018] Step 1.1, if the contaminated soil area crosses under the road and the tunnel is located in the middle of the road, the road red line is set as the boundary of the enclosure structure, that is, the envelope value of the tunnel plane contour boundary and the contaminated soil plane treatment boundary is taken to determine the contaminated soil plane treatment boundary, and at the same time, according to the construction plan of the tunnel to be built, the tunnel structure boundary of the corresponding enclosure structure is set;

[0019] Step 1.2: The plane treatment boundary of the contaminated soil and the retaining structure of the tunnel to be built are defined in plane layout according to the envelope values ​​of the two.

[0020] More preferably, in step 1.2, if the tunnel to be built is located in the middle area of ​​a road and the contaminated soil area spans under the road, the red line boundary of the road is used as the tunnel structure boundary of the enclosure structure.

[0021] Preferably, in step 2, the vertical treatment range, that is, the bottom boundary of the contaminated soil treatment, is determined according to the treatment requirements of the contaminated soil area.

[0022] Preferably, the tunnel structure floor and all the convex structural beams below that are crisscrossed in a grid-like pattern form a waterproof concrete layer with a thickness of more than 250 mm at the thinnest point.

[0023] Preferably, cement-based materials are added to the tunnel structure floor during manufacture.

[0024] Beneficial effects of the present invention:

[0025] The present invention is an efficient, economical and sustainable solution, which makes up for the shortcomings of the existing technology, realizes more efficient use of resources, can improve construction efficiency, reduce construction risks, and effectively manage the construction process in deeply polluted areas, with significant economic benefits and social value.

[0026] The present invention effectively improves the construction speed of tunnels and underground engineering projects in deeply polluted soil areas such as industrial waste land, heavy metal pollution areas, and old chemical plant sites, and ensures safety and stability during construction and subsequent use.

[0027] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic plan view showing an embodiment of the present invention.

[0029] Figure 2 A cross-sectional schematic diagram showing an embodiment of the present invention.

[0030] Figure 3 A schematic cross-sectional view of an enclosure structure is shown according to an embodiment of the present invention.

[0031] Figure 4 A schematic diagram of the construction process below the tunnel structure floor in one embodiment of the present invention is shown.

[0032] Figure 5 A partially enlarged cross-sectional schematic diagram of a tunnel structure bottom plate in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] Example

[0034] like Figures 1 to 5 As shown, the permanent and temporary combined comprehensive safety management method for rapid shallow tunnel construction in deep contaminated soil areas is used for rapid construction of shallow tunnels in deep contaminated areas, including the following steps:

[0035] Rapid construction of shallow tunnels in deep contaminated areas means: in deep contaminated areas, it is usually required to set an observation period of 1-2 years after treatment to evaluate soil stability and environmental impact. However, with the acceleration of urbanization, the demand for shallow buried tunnel construction is becoming more urgent. Therefore, it is necessary to quickly promote tunnel construction under the premise of ensuring safety and environmental protection. Therefore, rapid construction of shallow tunnels in deep contaminated areas requires both to be taken into account and save construction time.

[0036] Step 1: defining the horizontal boundary 1 of the contaminated soil treatment in the contaminated soil area and defining the horizontal tunnel structure boundary 2 of the retaining structure of the tunnel to be built;

[0037] Step 2: Determine the vertical treatment scope of the contaminated soil area and the bottom boundary of the foundation pit excavation of the tunnel to be built; the bottom boundary of the foundation pit excavation is determined according to the treatment boundary of the contaminated soil depth and the unfavorable value of the bottom boundary of the foundation pit excavation of the tunnel to be built;

[0038] Step 3, digging a foundation pit and building a support structure 5 during the digging process;

[0039] The support structure 5 is provided with convex structural beams 6 which are evenly distributed in the width direction and the length direction below the tunnel structure bottom plate 4 and cross-shaped in a grid shape at a position corresponding to the tunnel structure bottom plate 4 which has not been built yet;

[0040] Among them, the elevations of all convex structural beams 6 uniformly distributed along the width direction of the tunnel structure bottom plate 4 are grouped in groups and lowered or raised in sequence, and each convex structural beam 6 is provided with a plurality of circular protruding structures along the length direction on the upper side of the tunnel structure bottom plate 4;

[0041] Step 4: After excavating to the bottom of the foundation pit, conduct a contaminated soil compliance test. If the soil is qualified, backfill the soil to an elevation that meets the requirements for building the tunnel structure bottom plate 4, and at the same time remove the support structure 5 except for the convex structural beam 6;

[0042] If the soil fails the compliance test, it is necessary to continue digging to the qualified soil boundary;

[0043] Step 5, constructing the cushion layer, waterproof layer and tunnel structure bottom plate 4 of the tunnel to be built in layers from the bottom of the pit where the backfill soil is completed upward;

[0044] All convex structural beams 6 are buried under the tunnel structure bottom plate 4, and the bottom is in a stepped shape that matches all the convex structural beams 6 evenly distributed along its width direction, forming a serrated bottom edge in the cross section, forming a concrete layer with a thickness that meets the minimum waterproofing requirement with all the convex structural beams 6 that cross vertically and horizontally in a grid shape below.

[0045] The invention aims to solve the support problem in the rapid construction of shallow tunnels in deep polluted areas.

[0046] The present invention does not set up a traditional temporary support system for deep underground contaminated areas, but uses a support structure 5 including convex structural beams 6 that cross vertically and horizontally in a grid shape as a tunnel excavation support system, and directly combines the convex structural beams 6 that cross vertically and horizontally in a grid shape with the permanent tunnel structure bottom plate 4 as one.

[0047] Specifically, the support structure 5 of the present invention can provide necessary support force during foundation pit excavation, and after the tunnel structure is completed, the convex structural beams 6 that cross vertically and horizontally in a grid shape are embedded in the tunnel structure bottom plate 4 as part of the permanent structure.

[0048] Through the above-mentioned technical means, not only the cost of dismantling and handling the supporting structure 5 can be reduced, but also more efficient use of resources can be achieved, construction efficiency can be improved, construction risks can be reduced, and the construction process in deep pollution areas can be effectively managed, which has significant economic benefits and social value.

[0049] When the tunnel structure bottom plate 4 is shallower than the bottom boundary 3 of the contaminated soil treatment, there is a difference in elevation between the tunnel structure bottom plate 4 and the bottom of the foundation pit. During the excavation of the foundation pit to the bottom of the pit, the tunnel structure bottom plate 4 cannot serve as an effective support system. The tunnel bottom plate boundary is shallower than the contaminated soil boundary. The foundation pit needs to be dug to the contaminated soil boundary. Therefore, the foundation pit needs to continue to be excavated. This is different from the situation in other normal circumstances where the bottom plate can be used as the internal support of the bottom foundation pit support, which is an objective factor in the occasion cited by the present invention.

[0050] In some embodiments, step 1 is as follows:

[0051] Step 1.1, if the contaminated soil area crosses under the road and the tunnel is located in the middle of the road, the road red line is set as the boundary of the enclosure structure, that is, the envelope value of the tunnel plane contour boundary and the contaminated soil plane treatment boundary is taken to determine the contaminated soil plane treatment boundary 1, and at the same time, according to the construction plan of the tunnel to be built, the tunnel structure boundary 2 of the corresponding enclosure structure is set;

[0052] Step 1.2: The contaminated soil plane treatment boundary 1 and the retaining structure of the tunnel to be built are defined in plane layout according to their envelope values.

[0053] In some embodiments, in step 1.2, if the tunnel to be built is located in the middle area of ​​a road and the contaminated soil area crosses under the road, the red line boundary of the road is used as the tunnel structure boundary 2 of the enclosure structure.

[0054] In practical applications, the above-mentioned technical means can ensure the effective treatment of contaminated soil areas.

[0055] In some embodiments, in step 2, the vertical treatment range, that is, the contaminated soil treatment bottom boundary 3, is determined according to the treatment requirements of the contaminated soil area.

[0056] In some embodiments, the tunnel structure bottom plate 4 and all the convex structural beams 6 below that cross each other in a grid-like manner form a waterproof concrete layer with a thickness of more than 250 mm at the thinnest point.

[0057] In some embodiments, the tunnel structure floor 4 is manufactured by adding cement-based materials.

[0058] In actual applications, when manufacturing the tunnel structure floor 4, in addition to the conventional waterproof layer, in order to ensure the primary waterproof requirements of the floor, cement-based materials are also added to improve the density and waterproof performance of the tunnel structure floor 4 structure, thereby effectively ensuring the water-stopping effect at the junction of the support beam and the floor.

[0059] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A comprehensive safety management method for rapid shallow tunnel construction in deep contaminated soil areas that combines permanent and temporary construction, which is used for rapid construction of shallow tunnels in deep contaminated soil areas; it is characterized by: The steps include: Step 1: defining the horizontal boundary of the contaminated soil treatment in the contaminated soil area (1), and defining the horizontal boundary of the tunnel structure of the retaining structure of the tunnel to be built (2); Step 2: determining the vertical treatment range of the contaminated soil area and the bottom boundary of the foundation pit excavation of the tunnel to be built; the bottom boundary of the foundation pit excavation is determined according to the treatment boundary of the contaminated soil depth and the unfavorable value of the bottom boundary of the foundation pit excavation of the tunnel to be built; Step 3, excavating the foundation pit and building a support structure (5) during the excavation process; The support structure (5) is provided with convex structural beams (6) which are evenly distributed in the width direction and the length direction below the tunnel structure bottom plate (4) and cross-shaped in a grid shape at a position corresponding to the tunnel structure bottom plate (4) which has not yet been built; The elevations of all the convex structural beams (6) uniformly distributed along the width direction of the tunnel structure bottom plate (4) are grouped in groups and sequentially lowered or raised, and each of the convex structural beams (6) is provided with a plurality of circular protruding structures along the length direction on the upper side facing the tunnel structure bottom plate (4); Step 4, after excavating to the bottom of the foundation pit, conduct a contaminated soil compliance test, and if qualified, backfill the soil to an elevation that meets the requirements for building the tunnel structure bottom plate (4), and at the same time remove the support structure (5) except for the convex structural beam (6); If the soil fails the compliance test, it is necessary to continue digging to the qualified soil boundary; Step 5, constructing a cushion layer, a waterproof layer and a tunnel structure bottom plate (4) of the tunnel to be built in order from the bottom of the pit where the backfill soil is completed upwards; All the convex structural beams (6) are buried under the tunnel structure bottom plate (4), and the bottom is in a stepped shape matching all the convex structural beams (6) uniformly distributed along its width direction, forming a sawtooth bottom edge in the cross section, and forming a concrete layer with a thickness that meets the minimum waterproof requirement with all the convex structural beams (6) intersecting vertically and horizontally in a grid shape below.

2. The method for rapid comprehensive safety management of shallow tunnels in deep contaminated soil areas combined with permanent and temporary treatment according to claim 1 is characterized in that: Step 1 is as follows: Step 1.1, if the contaminated soil area crosses under the road and the tunnel is located in the middle of the road, the road red line is set as the boundary of the enclosure structure, that is, the envelope value of the tunnel plane contour boundary and the contaminated soil plane treatment boundary is taken to determine the contaminated soil plane treatment boundary (1), and at the same time, according to the construction plan of the tunnel to be built, the tunnel structure boundary of the corresponding enclosure structure is set (2); Step 1.2: The contaminated soil plane treatment boundary (1) and the retaining structure of the tunnel to be built are defined in plane layout according to the envelope values ​​of the two.

3. The method for rapid comprehensive safety management of shallow tunnels in deep contaminated soil areas combined with permanent and temporary treatment according to claim 2 is characterized in that: In step 1.2, if the tunnel to be built is located in the middle area of ​​a road and the contaminated soil area spans under the road, the red line boundary of the road is used as the tunnel structure boundary (2) of the enclosure structure.

4. The method for rapid comprehensive safety management of shallow tunnels in deep contaminated soil areas combined with permanent and temporary treatment according to claim 1 is characterized in that: In step 2, the vertical treatment range, i.e., the bottom boundary of the contaminated soil treatment, is determined according to the treatment requirements of the contaminated soil area (3).

5. The method for rapid comprehensive safety management of shallow tunnels in deep contaminated soil areas combined with permanent and temporary construction according to claim 1 is characterized in that: The tunnel structure bottom plate (4) and all the convex structural beams (6) below that cross each other in a grid-like manner form a waterproof concrete layer with a thickness of more than 250 mm at the thinnest point.

6. The method for rapid comprehensive safety management of shallow tunnels in deep contaminated soil areas combined with permanent and temporary treatment according to claim 1 is characterized in that: The tunnel structure bottom plate (4) is added with cement-based materials during manufacturing.

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