CN111794756A - Construction method for multi-arch connection small-static-distance tunnel of mountain highway - Google Patents
Construction method for multi-arch connection small-static-distance tunnel of mountain highway Download PDFInfo
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- CN111794756A CN111794756A CN202010685766.3A CN202010685766A CN111794756A CN 111794756 A CN111794756 A CN 111794756A CN 202010685766 A CN202010685766 A CN 202010685766A CN 111794756 A CN111794756 A CN 111794756A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
Abstract
The invention discloses a construction method of a multi-arch small-static-distance tunnel for a mountain highway, belonging to the technical field of highway tunnels and comprising the following steps; constructing an area A, constructing auxiliary tunnel construction branch holes, excavating an area E, timely constructing primary support after excavation, then sealing the tunnel face of the area E, and suspending excavation of the area E; then excavating an area B, constructing a large pile number section of a right hole, constructing an area C while constructing the area B, excavating a construction branch hole between the left hole and the right hole, constructing a secondary lining of an intersection of the area A, B, C, E, completing a locking notch of the intersection, excavating an area H by 50m, timely constructing primary support after excavating, then closing the tunnel face of the area H, and suspending excavation of the area H; constructing a D area, and constructing a left-hole large pile size section; and (3) performing two-lining trolley assembly in the excavated cavern in the H region while constructing the D region.
Description
Technical Field
The invention belongs to the technical field of expressway tunnels, and particularly relates to a construction method of a mountain expressway multi-arch small static distance tunnel.
Background
In recent years, more and more mountain highways have been planned and constructed. The highway brings great convenience to the mountain traffic. However, since the highway belongs to a high-grade highway, the requirement on linear indexes is high, the terrain in mountainous areas is steep and has large fluctuation, more and more tunnels and bridges are generated, more and more bridges are connected with the tunnels, and the design and construction difficulty is increased. More and more bridges of the mountain highway are connected with tunnels, particularly, holes are connected with whole bridge sections, construction sites are not provided for the holes, auxiliary tunnel construction is needed, wherein the tunnels are in a combined form that a multi-arch hole is connected with a small-clear-distance hole section and then connected with a separated hole section, and construction difficulty is high.
Disclosure of Invention
The invention aims to solve the technical problems of more bridge-connected tunnels and higher design and construction difficulty in the prior art, and aims to provide a construction method for a mountain highway multi-arch small-static-distance tunnel, which has the characteristics of simple construction process and lower cost.
The invention is realized by the following technical scheme:
a method for constructing a small-static-distance tunnel for multi-arch connection of a highway in a mountain area comprises the following steps that an area A is a first construction branch tunnel, an area B is a tunnel body section for connecting a construction branch tunnel and a right-tunnel separated section tunnel portal, an area C is a second construction branch tunnel, an area D is a tunnel body section for connecting a second construction branch tunnel and a left-tunnel separated section portal, an area E is an ultra-small-clear-distance section and a small-clear-distance section for connecting a construction branch tunnel and a right-tunnel multi-arch section, an area F is a pilot tunnel in the multi-arch section, an area G is a right-tunnel multi-arch section, and an area H is an ultra-small-clear-distance section and a small-clear-distance section for connecting the construction branch tunnel and the left-tunnel multi-arch section;
s1, constructing an area A, and constructing auxiliary tunnel construction branch holes;
s2, firstly excavating the E area, timely constructing primary support after excavation, then sealing the tunnel face of the E area, and suspending excavation of the E area; then excavating a B area, constructing a large pile number section of the right hole, and assembling a second lining trolley in the excavated cavity of the E area while constructing the B area;
s3, constructing a C area, and excavating a construction branch tunnel between the left tunnel and the right tunnel;
s4, performing construction on a second lining of the intersection in the A, B, C, E area to finish locking of the intersection;
s5, excavating an H area for 50m, timely constructing primary support after excavation, then closing the tunnel face of the H area, and suspending excavation of the H area; constructing a D area, and constructing a left-hole large pile size section; assembling a second liner trolley in the excavated cavity of the H area while constructing the D area;
s6, performing construction on a second lining of the intersection in the C, D, H area to finish locking of the intersection;
and S7, constructing an E area, and in a small clear distance range and a middle rock wall range, adopting yielding anchor rods as system anchor rods to reinforce the middle rock wall, wherein the weakest part of the multi-arch tunnel is a middle wall, so that the middle wall is the key point for monitoring and measuring the small clear distance tunnel. The method mainly comprises the following steps that the middle wall of the multi-arch tunnel is mainly used for testing the base pressure of the middle wall and the stress of the middle part of the middle wall, if the two monitoring projects have abnormal stress curves of one project and have no obvious convergence tendency or the middle wall has micro cracks, the monitoring on the middle wall is strengthened, meanwhile, engineering measures are taken according to actual conditions, and construction is stopped if necessary; if the stress change curves of the two terms are abnormal and have no obvious convergence trend or the middle wall has obvious cracks, the construction should be stopped, and engineering measures are taken to adjust the original support parameters or excavation methods;
s8, constructing an F area, excavating the pilot tunnel in the multi-arch section, firstly penetrating through the middle pilot tunnel, excavating the main tunnel after the construction of the middle wall is finished, and excavating the upper step of the main tunnel after the main tunnel is excavated after the construction of the inverted arch of the previous tunnel is finished; excavating from top to bottom, and constructing a lining from bottom to top;
s9, constructing a G area, and excavating a right tunnel of the multi-arch paragraph;
and S10, constructing an H area, and excavating within the range of the left hole small pile number.
The tunnel body lining of the small clear distance tunnel is mainly combined with western subject research results, and is constructed according to the new Olympic method by adopting an engineering similarity method, and tunnel lining support parameters are determined by combining the concrete setting condition and the geological condition of the clear distance of the tunnel in the road section. Meanwhile, the monitoring measurement is also enhanced:
the weakest part of the small-clearance tunnel is a middle rock wall, and the damage of the middle rock wall starts from the position of the arch waist at one side close to the front tunnel, so that the middle rock wall is the key point of the monitoring and measuring of the small-clearance tunnel, and the middle rock wall is the position of the arch waist at one side close to the front tunnel.
And secondly, immediately checking whether longitudinal cracks appear at the arch waist position of one side of the middle rock wall close to the preceding tunnel after blasting excavation of the following tunnel, and immediately stopping construction and reinforcing the middle rock wall if the width of the cracks exceeds 3mm or the length of the cracks exceeds 3 m.
Monitoring the blasting vibration speed of the position of the second lining of the first tunnel during the blasting of the surrounding rock of the backward tunnel, and controlling the blasting vibration speed within the following range: the initial setting time is less than 2.5cm/s for 3 days, the secondary lining time is less than 5.0cm/s for 3 days to 7 days, and the secondary lining time is less than 10cm/s for 7 days to 28 days.
Fourthly, monitoring and measuring the pilot holes are divided into two stages: the stage of digging the hole and the stage of digging the hole behind. The monitoring and measuring of the hole excavation stage is the same as that of a separated tunnel, and the peripheral relative displacement value of the stably excavated advanced hole does not exceed 90 percent of the allowable relative displacement value of the periphery of the tunnel; the backward hole excavation stage may cause the increase of the peripheral displacement of the forward hole, and after the tunnel face of the backward hole passes through the forward hole monitoring section 1B (B — single hole excavation width), the peripheral relative displacement value of the forward hole should not exceed the allowable relative displacement value of the tunnel periphery.
The monitoring measurement of the rear tunnel is the same as that of the separated tunnel
According to the further optimization of the invention, the separated section adopts a separated lining structure, the small clear distance section adopts a small clear distance lining structure, and the multiple arch section adopts a multiple arch lining structure;
in a further preferred embodiment of the present invention, in the ultra-small clear-distance non-linked arch section with a clear distance smaller than 6m in the left line H region, excavation is performed by using a milling and excavating machine or a boom-type tunneling machine, the weakest part of the small clear-distance tunnel is a middle rock wall, and the middle rock wall is damaged at the arch waist position on the side close to the front tunnel, so that the middle rock wall is the key point of the monitoring and measuring of the small clear-distance tunnel, and the key point of the monitoring and measuring of the middle rock wall is the arch waist position on the side close to the front tunnel.
According to the invention, further optimization is carried out, in the ultra-small clear distance non-arch-connected paragraph with the clear distance smaller than 6m in the left line H area, the blasting speed is controlled during blasting excavation, the disturbance to the right hole is reduced, after blasting excavation of the backward hole, whether longitudinal cracks appear at the arch waist position of the middle rock wall close to the side of the forward hole is immediately checked, if the width of the cracks exceeds 3mm or the length exceeds 3m, construction is immediately stopped, and meanwhile, the middle rock wall is reinforced.
In a further preferred embodiment of the present invention, the tunnel excavation method is selected according to geological conditions, and the excavation method is adjusted according to a deformation convergence condition.
In order to facilitate assembly of the secondary lining trolley, excavation clearance of an assembled section in a main tunnel of the secondary lining trolley is enlarged by 50cm, and secondary lining same-level concrete is backfilled.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention is suitable for connecting the tunnel portal to the whole bridge, the tunnel has no construction site outside, the tunnel is a combined form of connecting the multi-arch portal to the small clear distance portal section and then connecting the separated type portal body section, a construction branch tunnel is required to enter the small clear distance section, and then the construction method is respectively carried out towards two ends.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The present invention will be described in detail with reference to fig. 1.
The first embodiment is as follows: a method for constructing a small-static-distance tunnel for multi-arch connection of a highway in a mountain area comprises the following steps that an area A is a first construction branch tunnel, an area B is a tunnel body section for connecting a construction branch tunnel and a right-tunnel separated section tunnel portal, an area C is a second construction branch tunnel, an area D is a tunnel body section for connecting a second construction branch tunnel and a left-tunnel separated section portal, an area E is an ultra-small-clear-distance section and a small-clear-distance section for connecting a construction branch tunnel and a right-tunnel multi-arch section, an area F is a pilot tunnel in the multi-arch section, an area G is a right-tunnel multi-arch section, and an area H is an ultra-small-clear-distance section and a small-clear-distance section for connecting the construction branch tunnel and the left-tunnel multi-arch section;
s1, constructing an area A, and constructing auxiliary tunnel construction branch holes;
s2, firstly excavating the E area, timely constructing primary support after excavation, then sealing the tunnel face of the E area, and suspending excavation of the E area; then excavating a B area, constructing a large pile number section of the right hole, and assembling a second lining trolley in the excavated cavity of the E area while constructing the B area;
s3, constructing a C area, and excavating a construction branch tunnel between the left tunnel and the right tunnel;
s4, performing construction on a second lining of the intersection in the A, B, C, E area to finish locking of the intersection;
s5, excavating an H area for 50m, timely constructing primary support after excavation, then closing the tunnel face of the H area, and suspending excavation of the H area; constructing a D area, and constructing a left-hole large pile size section; assembling a second liner trolley in the excavated cavity of the H area while constructing the D area;
s6, performing construction on a second lining of the intersection in the C, D, H area to finish locking of the intersection;
and S7, constructing an E area, and in a small clear distance range and a middle rock wall range, adopting yielding anchor rods as system anchor rods to reinforce the middle rock wall, wherein the weakest part of the multi-arch tunnel is a middle wall, so that the middle wall is the key point for monitoring and measuring the small clear distance tunnel. The method mainly comprises the following steps that the middle wall of the multi-arch tunnel is mainly used for testing the base pressure of the middle wall and the stress of the middle part of the middle wall, if the two monitoring projects have abnormal stress curves of one project and have no obvious convergence tendency or the middle wall has micro cracks, the monitoring on the middle wall is strengthened, meanwhile, engineering measures are taken according to actual conditions, and construction is stopped if necessary; if the stress change curves of the two terms are abnormal and have no obvious convergence trend or the middle wall has obvious cracks, the construction should be stopped, and engineering measures are taken to adjust the original support parameters or excavation methods;
s8, constructing an F area, excavating the pilot tunnel in the multi-arch section, firstly penetrating through the middle pilot tunnel, excavating the main tunnel after the construction of the middle wall is finished, and excavating the upper step of the main tunnel after the main tunnel is excavated after the construction of the inverted arch of the previous tunnel is finished; excavating from top to bottom, and constructing a lining from bottom to top;
s9, constructing a G area, and excavating a right tunnel of the multi-arch paragraph;
and S10, constructing an H area, and excavating within the range of the left hole small pile number.
The tunnel body lining of the small clear distance tunnel mainly combines western subject research results and adopts an engineering similarity method to construct according to a new Olympic method, the tunnel lining support parameters are determined by combining the concrete setting condition and the geological condition of the clear distance of the tunnel of the road section, and meanwhile, the monitoring measurement is also strengthened:
the weakest part of the small-clearance tunnel is a middle rock wall, and the damage of the middle rock wall starts from the position of the arch waist at one side close to the front tunnel, so that the middle rock wall is the key point of the monitoring and measuring of the small-clearance tunnel, and the middle rock wall is the position of the arch waist at one side close to the front tunnel.
And secondly, immediately checking whether longitudinal cracks appear at the arch waist position of one side of the middle rock wall close to the preceding tunnel after blasting excavation of the following tunnel, and immediately stopping construction and reinforcing the middle rock wall if the width of the cracks exceeds 3mm or the length of the cracks exceeds 3 m.
Monitoring the blasting vibration speed of the position of the second lining of the first tunnel during the blasting of the surrounding rock of the backward tunnel, and controlling the blasting vibration speed within the following range: the initial setting time is less than 2.5cm/s for 3 days, the secondary lining time is less than 5.0cm/s for 3 days to 7 days, and the secondary lining time is less than 10cm/s for 7 days to 28 days.
Fourthly, monitoring and measuring the pilot holes are divided into two stages: the stage of digging the hole and the stage of digging the hole behind. The monitoring and measuring of the hole excavation stage is the same as that of a separated tunnel, and the peripheral relative displacement value of the stably excavated advanced hole does not exceed 90 percent of the allowable relative displacement value of the periphery of the tunnel; the backward hole excavation stage may cause the increase of the peripheral displacement of the forward hole, and after the tunnel face of the backward hole passes through the forward hole monitoring section 1B (B — single hole excavation width), the peripheral relative displacement value of the forward hole should not exceed the allowable relative displacement value of the tunnel periphery.
And fifthly, the monitoring measurement of the rear tunnel is the same as that of the separated tunnel.
The working principle is as follows: the construction method comprises the steps of entering a small clear distance section through a construction branch tunnel, and then respectively excavating towards two ends, is clear in excavation method thought, less in disturbance and very suitable for construction of connecting a highway multi-arch (tunnel portal) to a small clear distance tunnel under the complex underground condition of a mountain area.
The second embodiment: the separated section adopts a separated lining structure, the small clear distance section adopts a small clear distance lining structure, the multi-arch section adopts a multi-arch lining structure, the ultra-small clear distance non-multi-arch section with the clear distance smaller than 6m in the left line H area is excavated by adopting a milling excavator or a cantilever type tunneling machine, the weakest part of the small clear distance tunnel is a middle rock wall, and the middle rock wall is damaged at the arch waist position at one side close to the pilot tunnel, so the middle rock wall is the key point of monitoring and measuring the small clear distance tunnel, and the key point of monitoring and measuring the middle rock wall is the arch waist position at one side close to the pilot tunnel.
And in the ultra-small clear distance non-linked arch paragraph with the clear distance smaller than 6m in the left line H area, the blasting speed is controlled during blasting excavation, the disturbance to the right hole is reduced, after blasting excavation of a backward hole, whether longitudinal cracks appear at the arch waist position of one side of the middle rock wall close to the forward hole is immediately checked, if the width of the cracks exceeds 3mm or the length exceeds 3m, construction is immediately stopped, and meanwhile, the middle rock wall is reinforced.
The third embodiment is as follows: the tunnel excavation method is selected according to geological conditions, and the excavation method is adjusted according to the deformation convergence condition.
In order to facilitate the assembly of the secondary lining trolley, the excavation clearance of the assembled section in the main tunnel of the secondary lining trolley is enlarged by 50cm, and concrete at the same level of the secondary lining is backfilled.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for constructing a small-static-distance tunnel for multi-arch connection of a highway in a mountain area is characterized by comprising the following steps of (1) enabling an area A to be a first construction branch tunnel, enabling an area B to be a tunnel body section for connecting a construction branch tunnel and a right-tunnel separated section tunnel portal, enabling an area C to be a second construction branch tunnel, enabling an area D to be a tunnel body section for connecting a second construction branch tunnel and a left-tunnel separated section tunnel portal, enabling an area E to be an ultra-small-clear-distance section and a small-clear-distance section for connecting a construction branch tunnel and a right-tunnel multi-arch section, enabling an area F to be a pilot tunnel in the multi-arch section, enabling an area G to be a right-tunnel multi-arch section, and enabling an area H to be an ultra-small-clear-distance section and a small-clear-distance section for connecting the;
s1, constructing an area A, and constructing auxiliary tunnel construction branch holes;
s2, firstly excavating the E area, timely constructing primary support after excavation, then sealing the tunnel face of the E area, and suspending excavation of the E area; then excavating a B area, constructing a large pile number section of the right hole, and assembling a second lining trolley in the excavated cavity of the E area while constructing the B area;
s3, constructing a C area, and excavating a construction branch tunnel between the left tunnel and the right tunnel;
s4, performing construction on a second lining of the intersection in the A, B, C, E area to finish locking of the intersection;
s5, excavating an H area, timely constructing primary support after excavation, then closing the tunnel face of the H area, and suspending excavation of the H area; constructing a D area, and constructing a left-hole large pile size section; assembling a second liner trolley in the excavated cavity of the H area while constructing the D area;
s6, performing construction on a second lining of the intersection in the C, D, H area to finish locking of the intersection;
s7, constructing an E area, and reinforcing the medium rock wall by adopting yielding anchor rods as system anchor rods in a small clear distance range and a medium rock wall range;
s8, constructing an F area, and excavating the pilot tunnel in the multi-arch paragraph;
s9, constructing a G area, and excavating a right tunnel of the multi-arch paragraph;
and S10, constructing an H area, and excavating within the range of the left hole small pile number.
2. The method as claimed in claim 1, wherein the tunnel is a combination of an arch-connected entrance section with a small clear distance and a separate entrance section, the separate section is a separate lining structure, the small clear distance section is a small clear distance lining structure, and the arch-connected section is a multi-arch lining structure.
3. The method as claimed in claim 1, wherein the excavation is performed by a milling machine or a cantilever type tunneling machine in the ultra-small clear distance non-arch section with the clear distance less than 6m in the left line H region.
4. The method as claimed in claim 1, wherein blasting excavation is performed by controlling blasting rate to reduce disturbance to the right tunnel in ultra-small clear distance non-arch-connected segments with clear distance less than 6m in the left line H region.
5. The method as claimed in claim 1, wherein the tunnel excavation method is selected according to geological conditions and adjusted according to the convergence of deformation.
6. The method of claim 1, wherein the excavation clearance of the assembled section in the main tunnel of the secondary lining trolley is enlarged by 50cm, and the secondary lining is backfilled with the same level of concrete.
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| CN113482630A (en) * | 2021-08-06 | 2021-10-08 | 中铁二局第四工程有限公司 | Pilot construction method applied to small-clear-distance double-hole tunnel |
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