CN109137660B - A kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof - Google Patents
A kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof Download PDFInfo
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- CN109137660B CN109137660B CN201811073218.4A CN201811073218A CN109137660B CN 109137660 B CN109137660 B CN 109137660B CN 201811073218 A CN201811073218 A CN 201811073218A CN 109137660 B CN109137660 B CN 109137660B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
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Abstract
The invention discloses a kind of backfilled roadbed supported sedimentation preloading methods of tunnel bottom based on large-scale Karst roof, before branch at the beginning of tunnel structure and two linings bind, pre-pressing system is established by components such as steel pipe post, jack, steel pipe post is arranged on backfill surface layer roadbed concrete slab, jack is installed thereon, jack is supported in Upper Plate of Karst Cave, it is loaded by jack and obtains precompressed counter-force, to increase steel pipe post stability, in steel casing pack fine sand, thus ground preloading, accelerated sedimentation are carried out to backfill ground in solution cavity.This technology is that ground precompressed applies counter-force using tunnel stabilization top plate, the components such as jack, which are connected, by installation steel pipe post realizes that top plate acts on the counter-force of ground, change prefabricating load size by adjusting jack, realizes non-uniformly distributed precompressed, the stage by stage loading methods such as precompressed by establishing pre-pressing system.
Description
Technical field
The invention belongs to foundation construction fields, and in particular to a kind of tunnel bottom backfill body based on large-scale Karst roof is pre-
Pressure method.
Background technique
With the development of foundation treatment technology, diversification is presented in the form of construction work for coping with sedimentation and deformation.Wherein, piling prepressing
The features such as method has construction is simple, and material easily takes.Existing construction technology include traditional piling prepressing, classification piling prepressing with
And vacuum preloading.As railway construction mileage increases, railway tunnel quantity is also continuously increased, and the tunnel for passing through soluble rock mass is got over
Come the tunnel more, southwest is built particularly in China, large-scale solution cavity is often disclosed, for high-order crossing-river tunnel, roadbed
Backfill processing is the processing method of relatively simple economy.After roadbed backfill construction, roadbed backfill faces larger settlement after construction, needs
In construction time accelerated sedimentation, stablize to run phase tunnel subsidence.It is backfilled roadbed supported common settlement treatment using piling prepressing
It is limited that measure, but due to the limitation in space in tunnel, traditional piling prepressing and classification piling prepressing implement effect, past
Toward the precompressed value that cannot reach demand, and heap unloading implements relatively difficult.The other methods such as vacuum preloading are also not easy to implement.
Summary of the invention
The object of the present invention is to provide a kind of ground precompressed modes in stability of cavern roof tunnel, make it can not only be in limited sky
It is interior accurately to reach prefabricating load design value, and a variety of precompressed loading forms can be provided according to field demand, realize precisely, it is high
Effect, multiplicity load.
The technical solution adopted by the invention is as follows:
A kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof, is arranged on tunnel base board
Fine sand is perfused in each steel pipe post in steel pipe post in a row, and jack is installed at the top of the steel pipe post, described
Jack with Upper Plate of Karst Cave be stablize support obtain precompressed counter-force, base board is filled out next time roadbed carry out precompressed load, finally
Achieve the purpose that subgrade settlement accelerates settlement stability after completion and tunnel operation.
Further, all jack system is controlled by a control system, can not only be loaded simultaneously, but also can divide
Step, hierarchical loading；Both pressure-loadeds can be waited, can also be loaded with unequal pressure.
Further, it the anisobaric loading method: by precompressed load in conjunction with settling data, settles small place and adopts
With big on-load pressure, big place is settled using small pressure-loaded；Accomplish on-demand precompressed, to adjust the uneven heavy of base board
Drop makes base board bulk settling meet requirement, and each section sedimentation variation is identical result.
Further, the substep, hierarchical loading mode, according to Tunnel Design calculate tunnel just prop up, two lining faces upward
It is heavy in the process to be equivalent to simulation constructing tunnel completely according to working procedure hierarchical loading for arch, two loads for serving as a contrast arch walls, track plates
Drop helps to find the technical problems such as uncertain sedimentation in advance；It can calculate in tunnel and set according to Tunnel Design simultaneously
Standby gross weight, train full load gross weight, are loaded stage by stage using pre-pressing system, the sedimentation shape during the operation of simulation tunnel
Condition helps to find issuable settlement issues after tunnel is open to traffic in advance.
Further, in tunnel, a steel pipe post is arranged within the scope of every 2m × 2m；After unwrapping wire is layouted, in roadbed
Column chassis is installed as prefabricating load plate on plate, steel pipe post is fixedly mounted on the prefabricating load plate.
Further, the steel pipe post includes multistage, wherein each section of steel pipe post is connected by connector.
Further, sand mouth is filled in the steel pipe post upper end setting, sand removing hole is arranged in lower end；Pre-pressing system has connected
Fine sand is perfused into steel pipe post from sand mouth is filled, to enhance Column stability, promotes column overall stiffness, facilitates very heavy by Cheng Hou
Precompressed is pushed up, while fine sand can be used as a part of prefabricating load；Sand removing hole is opened after precompressed and releases fine sand, can facilitate recycling steel
Pipe.
Further, actuator is installed additional on the jack, thus realize vibration precompressed, simulation bullet train vibration
Load settles the disturbance of ground.
Further, the prefabricating condition of the jack are as follows: large-scale solution cavity forms stable top during long term development
Plate forms servostabilization top plate in the construction process；After roadbed is backfilling into certain altitude, the spacing of body and Upper Plate of Karst Cave is backfilled
From Ying Shiyi.
Further, it installs cushion block between the jack and tunnel roof additional, and cushion block is fixed.
Further, specific construction method is as follows:
The first step, unwrapping wire is layouted on base board after having been cured, and primarily determines steel pipe post riding position；
Second step installs steel pipe post chassis, i.e. prefabricating load plate, fixed steel column；
Third step, installs steel pipe post, and column rigidity needs spreading column when inadequate；
4th step installs jack using elevator at the top of steel pipe post, connects jack and steel column, jack with
Install backing plate, fixed backing plate between tunnel roof additional；
Fine sand is perfused into steel pipe post for 5th step, and jack is first once preloaded, and eliminates construction gap, verifies
Steel pipe sand column, jack and cushion block stability prepare precompressed.
6th step controls prefabricating load and preloading speed using jack loading procedure, progressively reaches precompressed design
Load, synchro measure preloading feed back pre-compressed effect and pay attention to bulk settling stability.
7th step, after precompressed in place, is kept for the prefabricating load a few days, is gradually liberated jack according to pre-compressed effect, is removed pad
Plate, jack release column fine sand, recycle steel pipe post, complete precompressed.
Beneficial effects of the present invention are as follows:
It (1), can be in stability of cavern roof the invention proposes the ground prestressing technology in a kind of novel stability of cavern roof tunnel
It completes to achieve the purpose that ground preloading, stable settlement to the loading effect of ground in tunnel.
(2) the invention proposes a kind of loading method of precompressed accurate in stability of cavern roof tunnel, prefabricating load is accurately controlled
Size, control precision can reach 1kN, can effectively reduce construction error.
(3) present invention can apply about 100t/m to ground under the premise of space is limited in tunnel2Loading.
If needing 50m height preloading with the common hole tiny fragments of stone, coal, etc. or spoir preloading, to save preloading materials, precompressed effect is greatly improved
Fruit.
(4) non-uniformly distributed precompressed load can be achieved in the present invention, so can really realize pre- on demand in conjunction with settling data
Pressure, making bulk settling variation is identical result, realizes that bulk settling is stablized.
(5) present invention on jack install additional actuator after, it can be achieved that vibration precompressed, simulate bullet train oscillatory load pair
The disturbance of ground settles.
(6) present invention can realize precompressed stage by stage according to preloading demand, apply the corresponding payload values being calculated.First rank
Section can first apply the load with tunnel lining structure equal sizes, situation when simulation tunnel-liner is bound；Second stage can
Situation to apply the load with fixation means in tunnel, equipment equal sizes again, after the completion of simulation tunnel；Phase III can be with
Apply the load that equal sizes are fully loaded with train, situation when simulation tunnel is open to traffic again.And pass through the sedimentation after precompressed stage by stage
As a result sedimentation change curve is drawn, with this Predicted settlement development trend and final settlement.
(7) unequal pressure load may be implemented, the differential settlement of base board is adjusted, it is full to reach base board bulk settling
Sufficient requirement.
(8) components such as steel pipe and jack of the present invention after one use, can be recycled to secondary benefit
With thus save the cost.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is overall plan structure chart；
Fig. 2 is component connection schematic diagram；
Fig. 3 is precompressed sectional view；
In figure: 1-stablizes top plate, 2-cushion blocks, 3-jack, 4-steel pipe posts, 5-prefabricating load plates, 6-roadbeds
Plate, the graded broken stone layer of 7-water mixing mud, 8-backfill bodies, 10-fine sands, 11-fill sand mouth, 12-sand removing holes, and 13-steel pipes are stood
Column joint.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination；
In order to facilitate narration, if there is "upper", "lower", " left side " " right side " printed words in the present invention, only expression and attached drawing itself
Upper and lower, left and right direction it is consistent, not to structure rise restriction effect, it is only for convenient for description the present invention and simplification retouch
It states, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, and be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
As background technique is introduced, deficiency exists in the prior art, since large-scale solution cavity is during long term development
It gradually forms stable top plate or forms servostabilization top plate in the construction process, after roadbed is backfilling into certain altitude, can use
Supporting point of the Upper Plate of Karst Cave as precompressed counter-force provides precompressed counter-force for backfill ground, improves preloading effect.For this purpose, this
Invention proposes a kind of backfilled roadbed supported sedimentation prestressing technology of the tunnel bottom based on large-scale Karst roof, in branch and two at the beginning of tunnel structure
Before lining binds, pre-pressing system is established by components such as steel pipe post, jack, it is mixed that steel pipe post is arranged in backfill surface layer roadbed
On concrete board, jack is installed thereon, jack is supported in Upper Plate of Karst Cave, is loaded by jack and is obtained precompressed counter-force, is
Increase steel pipe post stability, in steel casing pack fine sand, thus to ground progress ground preloading is backfilled in solution cavity, it is heavy to accelerate
Drop.
The present invention is directed to the roadbed backfill type tunnel for passing through large-scale karst space, proposes the stabilization for making full use of Karst roof
Property, steel pipe post in a row is arranged on tunnel base board, the components such as jack are installed at the top of column, is to stablize with Upper Plate of Karst Cave
Support obtains precompressed counter-force, fills out roadbed next time to base board and carries out precompressed load, is finally reached subgrade settlement and accelerates to complete, tunnel
The purpose of settlement stability after operation.
In a kind of typical embodiment of the application, as shown in Figure 1-3, the invention proposes a kind of novel based on large size
The backfilled roadbed supported sedimentation preloading method of the tunnel bottom of Karst roof makes full use of rock before branch at the beginning of tunnel structure and two linings bind
The stability of molten top plate 1 establishes pre-pressing system by components such as steel pipe post 4, jack 3, is to stablize support with Upper Plate of Karst Cave
Precompressed counter-force is obtained, roadbed is filled out next time to base board and carries out precompressed load, subgrade settlement is finally reached and accelerates completion and tunnel fortune
The purpose of settlement stability after row.
It is the prepressing structure connection type that support obtains precompressed counter-force using Karst roof；It is arranged within the scope of i.e. every 2m × 2m
One steel pipe post 4；After unwrapping wire is layouted, column chassis is installed on base board 6 as prefabricating load plate 5, fixed steel pipe is vertical
Column 4, wherein each section of steel pipe post is connected by steel pipe post connector 13, the upper end of the column setting fills sand mouth 11, and sediment outflow is arranged in lower end
Mouth 12；Jack 3 is connected in the upper end of the column, connection type is to be bolted；Install cushion block 2 between jack and tunnel roof additional,
And it is cushion block 2 is fixed；Fine sand 10 is perfused into steel pipe post to improve column bearing capacity and stability from sand mouth 11 is filled；It will be very heavy
Unified programming Control is pushed up, makes it that can not only be evenly distributed with load simultaneously, but also can load step by step；Jack first carries out one after the completion of connection
Secondary preloading, eliminates construction gap, and specific connection type is as shown in Figure 2.
The prefabricating condition of pre-pressing system proposed by the present invention, i.e., large-scale solution cavity form stable top during long term development
Plate forms servostabilization top plate in the construction process；After roadbed is backfilling into certain altitude, the spacing of body and Upper Plate of Karst Cave is backfilled
From Ying Shiyi, it is usually no more than 15m.
The pre-pressing system is further applied load by the way that fine sand is perfused into steel pipe post and adjusts jack.It can accurately control
Prefabricating load size processed, control precision can reach 1kN.Each steel pipe post joint jack can produce the work of 200~400t
Firmly, can so about 50~100t/m be applied to ground2Loading.If with the common hole tiny fragments of stone, coal, etc. or spoir preloading, it is assumed that bulk density
20kN/m3, then the preloading of 25~50m height is needed, this cannot achieve in practical projects.
The loading method of the non-uniformly distributed unequal pressure of counter-force precompressed proposed by the present invention.Jack can be unified in pre-pressing system
Control, can also individually control, and each jack different pressures load may be implemented.By precompressed load in conjunction with settling data,
It settles small place and uses bigger on-load pressure, accomplish on-demand precompressed, control precision can reach 1kN, to adjust base board
Differential settlement, so that base board bulk settling is met requirement, each section sedimentation variation is identical result.
The loading method of counter-force precompressed classification precompressed proposed by the present invention calculates tunnel just branch, two according to Tunnel Design
The loads such as inverted arch, two lining arch walls, track plates are served as a contrast, according to working procedure hierarchical loading, are equivalent to simulation constructing tunnel process completely
Middle sedimentation helps to find the technical problems such as uncertain sedimentation in advance.Simultaneously tunnel can be calculated according to Tunnel Design
Interior equipment gross weight, train full load gross weight etc., are loaded stage by stage using pre-pressing system, heavy during the operation of simulation tunnel
Drop situation helps to find issuable settlement issues after tunnel is open to traffic in advance.
Actuator can be installed in the present invention on jack additional, to realize vibration precompressed, simulate bullet train oscillatory load pair
The disturbance of ground settles.Bullet train vibration so, which can be realized, in engineering site influences simulation, can obtain a large number of experiments and grind
Study carefully achievement, the research of assistant experiment room, while helping to find the technical problems such as uncertain sedimentation in advance.
Specific construction method is as follows:
The first step, unwrapping wire is layouted on base board after having been cured, and primarily determines steel pipe post riding position；
Second step installs steel pipe post chassis, i.e. prefabricating load plate, fixed steel column；
Third step, installs steel pipe post, and column rigidity needs spreading column when inadequate；
4th step installs jack using elevator at the top of steel pipe post, connects jack and steel column, jack with
Install backing plate, fixed backing plate between tunnel roof additional；
Fine sand is perfused into steel pipe post for 5th step, and jack is first once preloaded, and eliminates construction gap, verifies
Steel pipe sand column, jack and cushion block stability prepare precompressed.
6th step controls prefabricating load and preloading speed using jack loading procedure, progressively reaches precompressed design
Load, synchro measure preloading feed back pre-compressed effect and pay attention to bulk settling stability.
7th step, after precompressed in place, is kept for the prefabricating load a few days, is gradually liberated jack according to pre-compressed effect, is removed pad
Plate, jack release column fine sand, recycle steel pipe post, complete precompressed.
Technical characteristics of the invention have: before branch at the beginning of tunnel structure and two linings bind, passing through steel pipe post, jack
Equal components establish pre-pressing system, and steel pipe post is arranged on backfill surface layer roadbed concrete slab, installs jack thereon, very heavy
Top support is loaded by jack in Upper Plate of Karst Cave and obtains precompressed counter-force, to increase steel pipe post stability, is filled in steel pipe
Fine sand is filled out, ground preloading, accelerated sedimentation thus are carried out to backfill ground in solution cavity.This technology is ground using tunnel stabilization top plate
Precompressed applies counter-force, connects the components such as jack by installation steel pipe post and realizes that top plate acts on the counter-force of ground, passes through
It adjusts jack and changes prefabricating load size, realize non-uniformly distributed precompressed, stage by stage the loads side such as precompressed by establishing pre-pressing system
Formula.
The effect that the present invention generates is as follows:
The present invention can complete to reach ground preloading, stable settlement to the loading effect of ground in the tunnel of stability of cavern roof
Purpose.
The loading method of accurate precompressed in stability of cavern roof tunnel proposed by the present invention is accurate to control prefabricating load size, control
Precision processed can reach 1kN, can effectively reduce construction error.
The present invention can apply about 100t/m to ground under the premise of space is limited in tunnel2Loading.If with
The common hole tiny fragments of stone, coal, etc. or spoir preloading, then need 50m height preloading to greatly improve pre-compressed effect to save preloading materials.
Non- uniformly distributed precompressed load can be achieved in the present invention, so can really realize on-demand precompressed in conjunction with settling data, make
Bulk settling variation is identical result, realizes that bulk settling is stablized.
The present invention is installed additional after actuator on jack, it can be achieved that vibration precompressed, simulation bullet train oscillatory load is over the ground
The disturbance of base settles.
The present invention can realize precompressed stage by stage according to preloading demand, apply the corresponding payload values being calculated.First stage
The load with tunnel lining structure equal sizes, situation when simulation tunnel-liner is bound can first be applied；Second stage can be with
Apply the load with fixation means in tunnel, equipment equal sizes, the situation after the completion of simulation tunnel again；Phase III can be again
Apply the load that equal sizes are fully loaded with train, situation when simulation tunnel is open to traffic.And pass through the sedimentation knot after precompressed stage by stage
Fruit draws sedimentation change curve, with this Predicted settlement development trend and final settlement.
Unequal pressure load may be implemented, the differential settlement of base board is adjusted, reach base board bulk settling satisfaction
Requirement.
The components such as steel pipe and jack of the present invention after one use, can be recycled to secondary use,
To save the cost.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (8)
1. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof, which is characterized in that on tunnel road
Steel pipe post in a row is arranged on substrate, and fine sand is perfused in each steel pipe post, installs at the top of the steel pipe post
Jack, the jack are to stablize support to obtain precompressed counter-force with Upper Plate of Karst Cave, and it is pre- to fill out roadbed progress next time to base board
Pressure load is finally reached the purpose that subgrade settlement accelerates settlement stability after completion and tunnel operation；
Specific step is as follows:
The first step, unwrapping wire is layouted on base board after having been cured, and primarily determines steel pipe post riding position；
Second step installs steel pipe post chassis, i.e. prefabricating load plate, fixed steel pipe post；
Third step, installs steel pipe post, and column rigidity needs spreading column when inadequate；
4th step installs jack using elevator at the top of steel pipe post, connects jack and steel pipe post, jack and tunnel
Install backing plate, fixed backing plate between road top plate additional；
Fine sand is perfused into steel pipe post for 5th step, and jack is first once preloaded, and eliminates construction gap, verifies steel pipe
Column, jack and backing plate stability prepare precompressed；
6th step controls prefabricating load and preloading speed using jack loading procedure, progressively reaches precompressed design load,
Synchro measure preloading feeds back pre-compressed effect and pays attention to bulk settling stability；
7th step, after precompressed in place, is kept for the prefabricating load a few days, is gradually liberated jack according to pre-compressed effect, is removed backing plate, thousand
Jin top, releases column fine sand, recycles steel pipe post, completes precompressed.
2. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as described in claim 1,
Be characterized in that, all jack systems are controlled by a control system, can load simultaneously but step by step, hierarchical loading；
Pressure-loadeds can be waited, it also can unequal pressure load.
3. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as claimed in claim 2,
It is characterized in that, the unequal pressure loading method: by precompressed load in conjunction with settling data, settling small place using greatly
Pressure is carried, settles big place using small pressure-loaded；Accomplish on-demand precompressed, to adjust the differential settlement of base board, makes
Base board bulk settling meets requirement, and each section sedimentation variation is identical result.
4. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as claimed in claim 2,
It is characterized in that, the substep, graded loading way, calculating tunnel according to Tunnel Design, just branch, two lining inverted arch, two linings encircle
The load of wall, track plates, according to working procedure hierarchical loading；Simultaneously again according to Tunnel Design calculate equipment gross weight in tunnel,
Train full load gross weight is loaded stage by stage using pre-pressing system, the Deposition Situation during the operation of simulation tunnel.
5. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as described in claim 1,
It is characterized in that, in tunnel, a steel pipe post is arranged within the scope of every 2m × 2m；After unwrapping wire is layouted, installed on base board
Steel pipe post is fixedly mounted on the prefabricating load plate as prefabricating load plate in column chassis；
Further, the steel pipe post includes multistage, wherein each section of steel pipe post is connected by connector.
6. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as described in claim 1,
It is characterized in that, fills sand mouth in the steel pipe post upper end setting, sand removing hole is arranged in lower end；After the completion of pre-pressing system connection, from
It fills sand mouth and fine sand is perfused into steel pipe post, to enhance Column stability, promote column overall stiffness, facilitate jack precompressed,
Fine sand can be used as a part of prefabricating load simultaneously；Sand removing hole is opened after precompressed and releases fine sand, facilitates recycling steel pipe.
7. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as described in claim 1,
It is characterized in that, installs actuator additional on the jack, to realize vibration precompressed, simulation bullet train oscillatory load is over the ground
The disturbance of base settles.
8. a kind of backfilled roadbed supported sedimentation preloading method of tunnel bottom based on large-scale Karst roof as described in claim 1,
It is characterized in that, the prefabricating condition of the jack are as follows: large-scale solution cavity forms stable top plate or applied during long term development
Servostabilization top plate is formed during work；After roadbed is backfilling into certain altitude, backfilling distance between body and Upper Plate of Karst Cave should be suitable for.
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| DE3107788C2 (en) * | 1981-02-28 | 1982-11-25 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Method and apparatus for producing explosive devices with a main charge and a transfer charge in a casing |
| CN101270582B (en) * | 2007-06-01 | 2010-09-01 | 中铁西北科学研究院有限公司 | Method for setting bracing column in underground cavity |
| CN102844523B (en) * | 2010-02-19 | 2014-09-24 | 科学与工业研究会 | A device for roof support of underground mine/tunnel |
| CN103995097B (en) * | 2014-06-06 | 2016-03-02 | 中国科学院武汉岩土力学研究所 | A kind of test method and device of simulating jacking construction initiation stratum deformation |
| CN106677157A (en) * | 2017-02-17 | 2017-05-17 | 厦门中平公路勘察设计院有限公司 | Construction technology for deep soft foundation treatment |
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