CN113389555A - Construction protection method suitable for high-risk pipeline penetrating under underground excavation tunnel - Google Patents
Construction protection method suitable for high-risk pipeline penetrating under underground excavation tunnel Download PDFInfo
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- CN113389555A CN113389555A CN202110872151.6A CN202110872151A CN113389555A CN 113389555 A CN113389555 A CN 113389555A CN 202110872151 A CN202110872151 A CN 202110872151A CN 113389555 A CN113389555 A CN 113389555A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 title claims abstract description 59
- 230000000149 penetrating effect Effects 0.000 title claims abstract description 22
- 238000009412 basement excavation Methods 0.000 title claims description 23
- 230000002787 reinforcement Effects 0.000 claims abstract description 41
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 239000002689 soil Substances 0.000 claims description 49
- 239000011435 rock Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 17
- 238000004062 sedimentation Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims 3
- 239000003673 groundwater Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 241000372132 Hydrometridae Species 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The construction protection method is a construction protection technology which is formed by pre-reinforcing the bottom area of the high-risk pipeline by the underground tunnel with the high-risk pipeline, pre-reinforcing the bottom area of the high-risk pipeline by the ground, carrying out tracking grouting reinforcement on the bottom stratum of the high-risk pipeline by combining an informationized construction means and carrying out groundwater recharge measures to control the deformation of the pipeline in an all-round and whole process mode. The invention has mature process and simple and convenient operation, and has very important reference value and practical significance for the construction of high-risk pipelines penetrating under similar subway tunnels.
Description
Technical Field
The invention relates to the technical field of tunnel proximity construction, in particular to a construction protection method suitable for deformation control of a high-risk pipeline penetrating under a large-section underground excavated tunnel.
Background
Due to the special environment of urban tunnel construction, the situation that high-risk pipelines penetrate through the tunnel is often encountered, in order to reduce the influence of tunnel construction on pipelines, the common measures mainly include strengthening advanced support, selecting a proper excavation method, increasing the pre-reinforcement measure of an excavated tunnel, enhancing the primary support strength of the excavated tunnel, accelerating the primary support ring formation, primary support back post-grouting process and the like, all of which are deployed around a newly-built tunnel, aiming at inhibiting the displacement change of ground pipelines and the like by controlling the self-settlement deformation, and being a passive protection scheme, once high-risk pipelines and the like have continuous deformation tendency, the deformation development of the newly-built tunnel is stabilized by adopting the measures of stopping excavation, temporarily supporting the roof, reinforcing the interior of the tunnel and the like, so that the deformation trend of pipelines is delayed, the process is complex, long in duration and uncontrollable in consequence, and may seriously affect the safety of the pipeline. Therefore, how to safely and reliably pass important pipelines under tunnel construction, especially the construction of passing high-risk pipelines under large-section underground excavation tunnels under urban sensitive environments, is undoubtedly a great technical problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a construction protection method suitable for deformation control of a high-risk pipeline penetrating under a large-section underground excavated tunnel, which is additionally provided with a series of active protection measures besides the adoption of the passive protection scheme. Before entering a possible construction influence range of the underground excavated tunnel, the high-risk pipeline performs shallow pre-grouting on the bottom of the pipeline through the ground, so that the performance (compressibility) of the rock and soil is improved, the deformation resistance of the rock and soil is improved, and the vertical displacement of the pipeline in the construction process is limited; before the high-risk pipeline is penetrated under the underground excavated tunnel, deep pre-grouting is carried out on the arch part of the tunnel through the underground excavated tunnel, so that the homogeneity of rock soil is improved, the anti-sinking tensile shear stress of the rock soil is improved, and the sedimentation deformation of the underground excavated tunnel and the high-risk pipeline is further limited; in the process of penetrating a high-risk pipeline under a subsurface tunnel, an informatization construction means is adopted, and the displacement change of the pipeline is actively controlled by adopting a sleeve valve pipe tracking grouting process from the ground to a certain plane and depth range stratum of the pipeline. Meanwhile, a pressurizing and recharging technology is adopted in the construction process, the underground water level around the pipeline is maintained, and the compression deformation caused by water loss and solidification of a weak stratum is reduced, so that the pipeline is rapidly settled.
In order to achieve the purpose, the invention adopts the technical scheme that:
the construction protection method suitable for the high-risk pipeline penetrating through the underground tunnel comprises the construction protection technology which is formed by pre-reinforcing the bottom area of the high-risk pipeline by the underground tunnel penetrating through the high-risk pipeline and the ground, tracking grouting reinforcement on the bottom stratum of the high-risk pipeline by combining with an informationized construction means, and controlling the deformation of the pipeline in an all-round and whole process mode and is characterized by comprising the following steps of:
1) before the section of the high-risk pipeline (I) does not enter the construction influence range of the underground excavation tunnel (II), shallow layer pre-grouting reinforcement is carried out on the high-risk pipeline (I) through the ground (II) in advance, so that the homogeneity and compressibility of rock soil are improved, the anti-sinking tensile and shear stress of the rock soil is improved, and the vertical deformation of the pipeline in the construction process is limited;
2) after shallow layer pre-grouting reinforcement is completed on the high risk pipeline section, recharging wells are arranged in a certain range on two sides of the high risk pipeline section through the ground;
3) before the underground excavated tunnel is penetrated, after shallow layer pre-grouting reinforcement is completed, deep layer pre-grouting reinforcement of the stratum at the bottom of the pipeline is performed through the tunnel face of the underground excavated tunnel, so that the homogeneity of rock soil is improved, the anti-sinking tensile and shear stress of the rock soil is improved, and the sedimentation deformation of the underground excavated tunnel and the high-risk pipeline is limited;
4) in the process of undermining the tunnel, (c) carrying out slant sleeve valve pipe tracking grouting on the bottom stratum of the high-risk pipeline (i) through the ground (ii) by adopting an informatization construction means, and (c) timely reinforcing the rock soil with displacement deformation so as to control the vertical displacement of the high-risk pipeline (i).
And pre-grouting reinforcement is carried out on the stratum with a certain plane and depth range outside the high risk pipeline from the ground.
And the deep pre-reinforcement of the bottom of the high-risk pipeline comprises the steps of pre-grouting a stratum in a certain range of the arch part of the tunnel through a concealed tunnel, and injecting single-liquid slurry or double-liquid slurry through a horizontal drilling grouting process.
And the high risk pipeline tracking grouting reinforcement is performed by tracking grouting reinforcement on the stratum with a certain plane at the bottom and a depth range by adopting an oblique sleeve valve pipe tracking grouting process from the ground.
The pressurizing recharging technology is that recharging wells are arranged in a certain plane range on two sides of a high-risk pipeline from the ground to maintain the underground water level around the pipeline.
Before the high-risk pipeline (I) does not enter the underground excavation tunnel (II), the distance between the plane of the tunnel face of the underground excavation tunnel (II) and the plane of the high-risk pipeline (II) is more than 2d (diameter of the underground excavation tunnel (II)).
The high risk pipeline firstly has a shallow hole at the bottom for pre-grouting reinforcement secondly, the reinforcement depth is required to penetrate through a high compressibility soft soil layer and a residual soil layer and a completely weathered layer (R) which are sensitive to water loss. In the reinforcing process, the grouting pressure and the grouting amount are strictly controlled by combining the monitoring data.
The recharging wells are arranged on two sides of the high-risk pipeline, the distance between the plane of the recharging well and the plane of the shallow layer pre-grouting reinforcement is not less than 3-5 m, and therefore the situation that the recharging wells cannot be pressurized and recharged due to entering a reinforcement body is avoided; the vertical high-compressibility soft soil layer is penetrated into the water permeable residual soil layer and the completely weathered layer (R); the total water level change amplitude is maintained within 1m and is positioned above the high-compressibility soft soil layer.
The method comprises the following steps of (1) performing oblique sleeve valve pipe tracking grouting on a bottom stratum of a high-risk pipeline (I) through the ground, (7) before a hidden excavated tunnel (II) is penetrated, arranging sleeve valve pipes in advance, combining the pipe arrangement plane position with the actual situation of the high-risk pipeline (II), generally enabling the distance between the outer side of the high-risk pipeline (II) to be more than 3m, performing sleeve valve pipe tracking grouting in the hidden excavated tunnel (II) penetrating process, and enabling the grouting depth range to be from the bottom of the high-risk pipeline (II) to penetrate through a high-compressibility soft soil layer (III) and enter a residual soil layer and a completely weathered layer (III). In the reinforcing process, the grouting pressure and the grouting amount are strictly controlled by combining the monitoring data.
The informatization construction means comprises monitoring items of stress monitoring and displacement monitoring of a high-risk pipeline, ground settlement of an underground excavated tunnel, underground water level, settlement in the tunnel, convergence and the like.
Compared with the prior art, the invention has the following advantages:
the invention provides a construction protection method suitable for a high-risk pipeline penetrating under an underground excavation tunnel, which is characterized in that a series of active protection measures are added on the basis of passive protection measures of a conventional design scheme, and before the high-risk pipeline enters a possible construction influence range of the underground excavation tunnel, shallow pre-grouting is carried out on the bottom of the pipeline through the ground, so that the vertical displacement of the pipeline in the construction process is limited; before the high-risk pipeline is penetrated under the underground excavated tunnel, deep pre-grouting is carried out on the arch part of the tunnel through the underground excavated tunnel, so that the sedimentation deformation of the underground excavated tunnel and the high-risk pipeline is limited; in the process of penetrating a high-risk pipeline under a subsurface tunnel, an informatization construction means is adopted, and the displacement change of the pipeline is actively controlled by adopting a sleeve valve pipe tracking grouting process from the ground to a certain plane and depth range stratum of the pipeline. Meanwhile, a pressurizing and recharging technology is adopted in the construction process, the underground water level around the pipeline is maintained, and the compression deformation caused by water loss and solidification of a weak stratum is reduced, so that the pipeline is rapidly settled.
Drawings
FIG. 1 is a schematic view of the construction process of the present invention.
Wherein, in the figure: firstly, a high risk pipeline; ② ground; ③ recharging the well; fourthly, pre-grouting and reinforcing the stratum shallow layer at the bottom of the high risk pipeline; fifthly, tracking and grouting the high-risk pipeline oblique sleeve valve pipe; sixthly, tunneling; seventhly, pre-grouting and reinforcing the deep stratum of the vault of the underground excavated tunnel; eighthly, filling a soil layer; ninthly, a high-compressibility soft soil layer; the red (r) -the layer of residual soil and regolith sensitive to dehydration; low compressibility, strong, medium compressibility layer; water pumping-underground water level.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a construction protection method suitable for undermining high-risk pipelines in an undermining tunnel comprises the construction protection technology of comprehensively controlling pipeline deformation in the whole process, wherein the construction protection technology comprises the following steps of undermining high-risk pipelines, pre-reinforcing the bottom area of the high-risk pipelines by the ground, tracking grouting reinforcement on the bottom stratum of the high-risk pipelines by combining an information construction means, and recharging underground water measures, and is characterized by comprising the following steps:
1) before the section of the high-risk pipeline (I) does not enter the construction influence range of the underground excavation tunnel (II), shallow layer pre-grouting reinforcement is carried out on the high-risk pipeline (I) through the ground (II) in advance, so that the homogeneity and compressibility of rock soil are improved, the anti-sinking tensile and shear stress of the rock soil is improved, and the vertical deformation of the pipeline in the construction process is limited;
2) after shallow layer pre-grouting reinforcement is completed on the high risk pipeline section, recharging wells are arranged in a certain range on two sides of the high risk pipeline section through the ground;
3) before the underground excavated tunnel is penetrated, after shallow layer pre-grouting reinforcement is completed, deep layer pre-grouting reinforcement of the stratum at the bottom of the pipeline is performed through the tunnel face of the underground excavated tunnel, so that the homogeneity of rock soil is improved, the anti-sinking tensile and shear stress of the rock soil is improved, and the sedimentation deformation of the underground excavated tunnel and the high-risk pipeline is limited;
4) in the process of undermining the tunnel, (c) carrying out slant sleeve valve pipe tracking grouting on the bottom stratum of the high-risk pipeline (i) through the ground (ii) by adopting an informatization construction means, and (c) timely reinforcing the rock soil with displacement deformation so as to control the vertical displacement of the high-risk pipeline (i).
And pre-grouting reinforcement is carried out on the stratum with a certain plane and depth range outside the high risk pipeline from the ground.
And the deep pre-reinforcement of the bottom of the high-risk pipeline comprises the steps of pre-grouting a stratum in a certain range of the arch part of the tunnel through a concealed tunnel, and injecting single-liquid slurry or double-liquid slurry through a horizontal drilling grouting process.
And the high risk pipeline tracking grouting reinforcement is performed by tracking grouting reinforcement on the stratum with a certain plane at the bottom and a depth range by adopting an oblique sleeve valve pipe tracking grouting process from the ground.
The pressurizing recharging technology is that recharging wells are arranged in a certain plane range on two sides of a high-risk pipeline from the ground to maintain the underground water level around the pipeline.
Before the high-risk pipeline (I) does not enter the underground excavation tunnel (II), the distance between the plane of the tunnel face of the underground excavation tunnel (II) and the plane of the high-risk pipeline (II) is more than 2d (diameter of the underground excavation tunnel (II)).
The high risk pipeline firstly has a shallow hole at the bottom for pre-grouting reinforcement secondly, the reinforcement depth is required to penetrate through a high compressibility soft soil layer and a residual soil layer and a completely weathered layer (R) which are sensitive to water loss. In the reinforcing process, the grouting pressure and the grouting amount are strictly controlled by combining the monitoring data.
The recharging wells are arranged on two sides of the high-risk pipeline, the distance between the plane of the recharging well and the plane of the shallow layer pre-grouting reinforcement is not less than 3-5 m, and therefore the situation that the recharging wells cannot be pressurized and recharged due to entering a reinforcement body is avoided; the vertical high-compressibility soft soil layer is penetrated into the water permeable residual soil layer and the completely weathered layer (R); the total water level change amplitude is maintained within 1m and is positioned above the high-compressibility soft soil layer.
The method comprises the following steps of (1) performing oblique sleeve valve pipe tracking grouting on a bottom stratum of a high-risk pipeline (I) through the ground, (7) before a hidden excavated tunnel (II) is penetrated, arranging sleeve valve pipes in advance, combining the pipe arrangement plane position with the actual situation of the high-risk pipeline (II), generally enabling the distance between the outer side of the high-risk pipeline (II) to be more than 3m, performing sleeve valve pipe tracking grouting in the hidden excavated tunnel (II) penetrating process, and enabling the grouting depth range to be from the bottom of the high-risk pipeline (II) to penetrate through a high-compressibility soft soil layer (III) and enter a residual soil layer and a completely weathered layer (III). In the reinforcing process, the grouting pressure and the grouting amount are strictly controlled by combining the monitoring data.
The informatization construction means comprises monitoring items of stress monitoring and displacement monitoring of a high-risk pipeline, ground settlement of an underground excavated tunnel, underground water level, settlement in the tunnel, convergence and the like.
Before the section of high-risk pipeline does not enter the construction influence range of the underground excavated tunnel, shallow pre-grouting reinforcement is carried out on a certain plane of the high-risk pipeline and a stratum within a depth range by adopting a vertical sleeve valve pipe grouting process from the ground, so that the performance of rock soil is improved, the deformation resistance of the rock soil is improved, and the vertical displacement of the pipeline in the construction process is limited; before the high-risk pipeline is penetrated under the underground excavation tunnel, deep pre-grouting is carried out on the tunnel arch part through the underground excavation tunnel, and cement-water-glass double-liquid slurry is injected through a forward or backward grouting process, so that the homogeneity of rock soil is improved, the anti-sinking tensile shear stress of the rock soil is improved, and the sinking deformation of the underground excavation tunnel and the high-risk pipeline is limited; in the process of penetrating a high-risk pipeline under a subsurface tunnel, an information construction means (pipeline displacement point monitoring and stress monitoring) is adopted, and an oblique sleeve valve pipe tracking grouting process is adopted for strata in a certain plane and depth range between two lines of the pipeline from the ground, so that the rock and soil which are subjected to displacement deformation are reinforced in time, and the vertical displacement of the pipeline is controlled; meanwhile, a pressurizing recharge technology is adopted in a matching mode, recharge wells are arranged in a certain range on two sides of the high-risk pipeline, the underground water level around the pipeline is maintained, underground water level change caused by water loss in underground excavation construction is reduced, and the pipeline is rapidly settled due to consolidation compression deformation of a weak stratum. The invention has mature process and simple and convenient operation, and has very important reference value and practical significance for the construction of high-risk pipelines penetrating under similar subway tunnels.
Claims (10)
1. The construction protection method suitable for the high-risk pipeline penetrating through the underground tunnel comprises the construction protection technology which is formed by pre-reinforcing the bottom area of the high-risk pipeline by the underground tunnel penetrating through the high-risk pipeline and the ground, tracking grouting reinforcement on the bottom stratum of the high-risk pipeline by combining with an informationized construction means, and controlling the deformation of the pipeline in an all-round and whole process mode and is characterized by comprising the following steps of:
1) before the section of the high-risk pipeline (I) does not enter the construction influence range of the underground excavation tunnel (II), shallow layer pre-grouting reinforcement is carried out on the high-risk pipeline (I) through the ground (II) in advance, so that the homogeneity and compressibility of rock soil are improved, the anti-sinking tensile and shear stress of the rock soil is improved, and the vertical deformation of the pipeline in the construction process is limited;
2) after shallow layer pre-grouting reinforcement is completed on the high risk pipeline section, recharging wells are arranged in a certain range on two sides of the high risk pipeline section through the ground;
3) before the underground excavated tunnel is penetrated, after shallow layer pre-grouting reinforcement is completed, deep layer pre-grouting reinforcement of the stratum at the bottom of the pipeline is performed through the tunnel face of the underground excavated tunnel, so that the homogeneity of rock soil is improved, the anti-sinking tensile and shear stress of the rock soil is improved, and the sedimentation deformation of the underground excavated tunnel and the high-risk pipeline is limited;
4) in the process of undermining the tunnel, (c) carrying out slant sleeve valve pipe tracking grouting on the bottom stratum of the high-risk pipeline (i) through the ground (ii) by adopting an informatization construction means, and (c) timely reinforcing the rock soil with displacement deformation so as to control the vertical displacement of the high-risk pipeline (i).
2. The construction protection method suitable for the high-risk pipeline penetrating through the underground excavated tunnel according to claim 1, wherein the pre-grouting reinforcement is performed on the stratum with a certain plane and depth range outside the high-risk pipeline (i) from the ground (ii).
3. The construction protection method suitable for the underrun high risk pipeline of the underground excavated tunnel according to claim 1, wherein the deep pre-reinforcement at the bottom of the high risk pipeline is to pre-grout the stratum of a certain range of the arch of the tunnel through the underground excavated tunnel, and to inject single grout or double grout through a horizontal drilling grouting process.
4. The construction protection method suitable for the high-risk pipeline penetrating through the underground tunnel according to claim 1, wherein the high-risk pipeline tracking grouting reinforcement is performed by tracking grouting reinforcement on a stratum with a certain plane and depth range at the bottom of the high-risk pipeline (i) from the ground (ii).
5. The construction protection method suitable for the underground excavation tunnel to pass through the high-risk pipeline is characterized in that the pressurizing and recharging technology is to arrange a recharging well in a certain plane range on two sides of the high-risk pipeline (r) from the ground (c) so as to maintain the underground water level around the pipeline.
6. The construction protection method suitable for the high-risk pipeline penetrating through the underground excavated tunnel according to claim 1, wherein the distance between the plane of the tunnel face of the underground excavated tunnel and the high-risk pipeline is more than 2d (diameter of the underground excavated tunnel) before the high-risk pipeline enters the underground excavated tunnel.
7. The construction protection method suitable for the high-risk pipeline penetrating through the underground excavated tunnel according to claim 1, wherein the high-risk pipeline (r) is pre-grouted and reinforced by shallow holes at the bottom (r), and the reinforcement depth (c) is required to penetrate through a high-compressibility soft soil layer (c) and a residual soil layer (c) and a completely weathered layer (c) which are sensitive to water loss;
in the reinforcing process, the grouting pressure and the grouting amount are strictly controlled by combining the monitoring data.
8. The construction protection method suitable for the high-risk pipeline penetrating through the underground excavated tunnel according to claim 1, wherein the recharge wells are arranged on two sides of the high-risk pipeline (i), and the distance between the plane of the recharge well (iii) and the outer side of the shallow layer pre-grouting reinforcement (iv) is not less than 3-5 m, so that the recharge wells cannot be pressurized and recharged due to entering a reinforcement body; the vertical high-compressibility soft soil layer is penetrated into the water permeable residual soil layer and the completely weathered layer (R); the total water level change amplitude is maintained within 1m and is positioned above the high-compressibility soft soil layer.
9. The construction protection method suitable for the undermining tunnel to pass through the high-risk pipeline is characterized in that the high-risk pipeline (I) is subjected to oblique sleeve valve pipe tracking grouting through the ground (II), sleeve valve pipes are arranged in advance before the undermining tunnel (III) passes through, the pipe arrangement plane position is combined with the actual situation of the high-risk pipeline (I) on site and at a distance of more than 3m from the outer side of the high-risk pipeline (I), sleeve valve pipe tracking grouting is carried out in the undermining tunnel (III) passing process, and the grouting depth range is that the high-risk pipeline (I) penetrates through the high-compressibility soft soil layer (III) from the bottom to the residual soil layer and the whole-layer weathered soil layer (III);
in the reinforcing process, the grouting pressure and the grouting amount are strictly controlled by combining the monitoring data.
10. The construction protection method suitable for the high-risk pipeline penetrating under the underground excavation tunnel as claimed in claim 1, wherein the informatization construction means comprises monitoring items of stress monitoring and displacement monitoring of the high-risk pipeline, ground settlement of the underground excavation tunnel, underground water level, settlement in the tunnel, convergence and the like.
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| CN202110872151.6A CN113389555B (en) | 2021-07-30 | 2021-07-30 | Construction protection method suitable for high-risk pipeline under undercut tunnel |
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| CN202110872151.6A CN113389555B (en) | 2021-07-30 | 2021-07-30 | Construction protection method suitable for high-risk pipeline under undercut tunnel |
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2021
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