CN105696426A - Construction method for treating adjacent existing railway line soft soil foundation and roadbed structure thereof - Google Patents
Construction method for treating adjacent existing railway line soft soil foundation and roadbed structure thereof Download PDFInfo
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- CN105696426A CN105696426A CN201610208948.5A CN201610208948A CN105696426A CN 105696426 A CN105696426 A CN 105696426A CN 201610208948 A CN201610208948 A CN 201610208948A CN 105696426 A CN105696426 A CN 105696426A
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- Prior art keywords
- stake
- roadbed
- rigidity
- rotary churning
- pile
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention discloses a construction method for treating an adjacent existing railway line soft soil foundation and a roadbed structure thereof. The construction method comprises the steps of leveling the site, and longitudinally constructing a plurality of rows of rigid CFG piles along the line in the slope toe area of the side, away from an existing railway line, from a safety limit part to a designed newly-built roadbed; longitudinally constructing a plurality of rows of flexible jet grouting piles along the line in the slope toe area of the side, close to the existing railway line, from the safety limit part to the designed newly-built roadbed; longitudinally paving a mattress layer along the railway line above the rigid CFG piles and the flexible jet grouting piles and at the top of a soft soil layer; and paving a roadbed above the mattress layer according to the design. According to the construction method and the roadbed structure, the roadbed bearing capacity is effectively improved, the post-construction settlement of the roadbed is reduced, the stability of the soft soil foundation is guaranteed, and the negative impact to the safe operation of the existing railway line is avoided; and the roadbed reinforcement structure is simple in form, good in stratum adaptability, reasonable in technology, and economic in cost, and has relatively high popularization and application value.
Description
Technical field
The present invention relates to Geotechnical Engineering field, close on construction method and the road structure thereof of both wired soft soil foundations in particular to a kind of process。
Background technology
For ensureing high speed traveling safety, post-construction settlement of subgrade is required high by high-speed railway, and ballastless track roadbed settlement after construction is generally not to be exceeded that the relative settlement of 15mm, bridge or tunnel road changeover portion not should be greater than 5mm。High-speed railway is built and because being subject to yard or the restriction of other conditions, it is necessary to when adopting roadbed form to pass through, then need to take rational measures of foundation treatment, so that post-construction settlement of subgrade is within control standard in soft clay area。General soft soil foundation structure from bottom to up includes hard stratum, is positioned at the Soft Soil Layer above hard stratum, Soft Soil Layer end face is earth's surface, rigidity CFG pile composite foundation to treatment measures many employings single type of soft soil foundation at present, the most frequently used is CFG stake pile net structure composite foundation, " net " in " stake net " structure is sand, rubble and direction earthwork grille form certain thickness mattress layer, " stake " is CFG stake, upper load is made to be evenly transferred to lower sleeping soil layer, to meet ground requirement for bearing capacity, effectively control settlement after construction。A kind of long stake of rigidity CFG stake disclosed in Chinese invention patent (publication number is CN101148891A) " the rigid and flexible long-short pile composite foundation in processing for expressway soft foundation ", flexible stub be alternately distributed settings, upper end laying mattress layer structure。
Flourish along with railway construction in China cause, the railway network is day by day flourishing, and newly built railway and existing railway line inevitably produce parallel。When newly built railway soft soil foundation carries out CFG stake stake net basement process, because CFG pile machine equipment height reaches more than 24m, center of gravity is high, self-stability is poor, and needs frequent movement in work progress, it is impossible to effectively protect, having topples invades the possibility of both wired safety clearances, and both wired safe operations are caused danger；After another each construction terminates, construction equipment must be removed beyond safe distance, can be greatly prolonged the duration, increases engineering cost。
Hence for above-mentioned situation, need to develop a kind of consolidation process and close on construction method and the road structure thereof of both wired high-speed railway soft soil foundation, foundation bearing capacity can not only be improved, reduce post-construction settlement of subgrade, to both wired safe operation without having a negative impact during construction。
Summary of the invention
Present invention aim to solve the deficiency of above-mentioned background technology, it is provided that a kind of not only met post-construction settlement of subgrade and bearing capacity requirement, but also both wired safe operation, the construction method closing on both wired high-speed railway soft soil foundation and road structure thereof can be protected。
The technical scheme is that a kind of process closes on the construction method of both wired soft soil foundations, it is characterised in that step is:
A. place is flattened, multiple rows of rigidity CFG stake of longitudinally constructing in from margin of safety to the roadbed toe region away from existing line side of design, along circuit；
B. closing on from margin of safety to the roadbed designed in the toe region of existing line side, along the circuit longitudinally construction flexible rotary churning pile of multiple rows of construction, both pass through Soft Soil Layer to hard stratum at the bottom of described rigidity CFG stake and flexible rotary churning pile stake, stake top is all to Soft Soil Layer end face；
C. after rigidity CFG stake, flexible rotary churning pile concrete reach design strength, above rigidity CFG stake, flexible rotary churning pile, Soft Soil Layer top longitudinally lay mattress layer along circuit；
D. by design roadbed paving above mattress layer, described roadbed toe edge is concordant with mattress layer transverse edge。
Preferably, described rigidity CFG stake is provided with pile cover, and described pile cover top flushes in flexible rotary churning pile top。
Preferably, step a respectively arranges outside the rigidity CFG stake roadbed in the design toe away from existing line side, continue to arrange 1-2 root rigidity CFG stake to away from existing line direction；In step b, the flexible rotary churning pile of each row closes on outside the toe of existing line side at the roadbed of design, continues to existing line direction to arrange 1-2 root flexibility rotary churning pile。
Preferably, described flexible rotary churning pile stake footpath is 0.6-0.7m, and pile spacing is 2-3 times of stake footpath；Described rigidity CFG stake stake footpath is 0.5-0.6m, and pile spacing is 3-5 times of stake footpath。
Preferably, in step b before the flexible rotary churning pile of construction, constructing along the string stress relief hole of circuit longitudinal direction between the roadbed and existing line of design, described stress relief hole hole depth is with the degree of depth, spacing 3-4m at the bottom of flexible rotary churning pile stake。
Preferably, between multiple rows of rigidity CFG stake, the distances between adjacent two row's rigidity CFG stakes are equal, and often between row's rigidity CFG stake, the spacing of adjacent two rigidity CFG stakes side by side is equal；Between multiple rows of flexible rotary churning pile, the distances between the adjacent two flexible rotary churning piles of row are equal, and often between row's flexible rotary churning pile, the spacing of adjacent two flexible rotary churning piles side by side is equal。
Further, between adjacent two row's rigidity CFG stakes, laterally aligned arrangement or laterally staggered arrangement between the adjacent two flexible rotary churning piles of row。
The present invention also provides for a kind of process and closes on the road structure of both wired soft soil foundations, it is characterized in that, including being laid on the mattress layer at Soft Soil Layer top and being laid on above mattress layer, close on the roadbed of existing line, from margin of safety to roadbed away from the toe region of existing line side below described mattress layer, along the longitudinally disposed multiple rows of rigidity CFG stake of circuit, close in the toe region of existing line side below described mattress layer from margin of safety to roadbed, along the longitudinally disposed multiple rows of flexible rotary churning pile of circuit, Soft Soil Layer is both passed through to hard stratum at the bottom of described flexible rotary churning pile and rigidity CFG stake stake, stake top is all to Soft Soil Layer end face。
Preferably, described flexible rotary churning pile stake footpath is 0.6-0.7m, and pile spacing is 2-3 times of stake footpath；Described rigidity CFG stake stake footpath is 0.5-0.6m, and pile spacing is 3-5 times of stake footpath。
Preferably, described mattress layer is laid by blotter, medium coarse sand bed course, direction earthwork grille, the second medium coarse sand bed course and the second blotter successively from bottom to top and is formed。
Advantages of the present invention is:
1. adopting CFG pile machine equipment to arrange rigidity CFG stake outside 23-25m margin of safety, the height of the outer CFG stake machine 25m of margin of safety will not cause danger to both wired, without reducing efficiency of construction；Inner side adopts the rotary churning pile machine equipment of height 3m to arrange rotary churning pile, therefore adopts rotary churning pile to carry out reinforced soft soil ground within safety clearance, has both protected both Wired Security also can improve efficiency of construction。
2. by rigidity CFG stake and flexible rotary churning pile with the use of, gather the crowd in-out effects of the heavy and flexible rotary churning pile of control of rigidity CFG stake, top covers mattress layer can play the bearing capacity of inter-pile soil more fully, had both met the control requirement of settlement after construction, and had greatly reduced again construction costs。
3. being not only effectively increased foundation bearing capacity, the settlement after construction decreasing roadbed ensure that the stability of high-speed railway soft soil subgrade, also will not both wired safe operation be had a negative impact。Foundation reinforcing structure form of the present invention is simple, and ground adaptability is good, and technology is reasonable, cost, has comparatively wide application value。
Accompanying drawing explanation
Fig. 1 is the present invention along roadbed transversary schematic diagram
Fig. 2 is mattress layer along roadbed transversary schematic diagram
Fig. 3 is that rigidity CFG stake equilateral triangle arranges schematic diagram
Fig. 4 is rigidity CFG stake arranged in squares schematic diagram
Wherein: 1. flexible rotary churning pile 6. mattress layer 7. pile cover 8. stress relief hole 9. existing line 10. margin of safety 6.1 blotter 6.2 medium coarse sand bed course 6.3 direction earthwork grille 6.4 second medium coarse sand bed course 6.5 second blotter of roadbed 2. Soft Soil Layer 3. hard stratum 4. rigidity CFG stake 5.。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail。
As shown in Figure 1, offer of the present invention processes the road structure closing on both wired soft soil foundations, soft soil foundation structure from bottom to up includes hard stratum 3, is positioned at the Soft Soil Layer 2 above hard stratum 3, road structure includes the mattress layer 6 being laid on Soft Soil Layer 2 top and is laid on above mattress layer 6, closes on the roadbed 1 of existing line 9, and roadbed 1 side is existing line 9 (for right side in the present embodiment)。When the margin of safety 10 of existing line of the present invention is construction rigidity CFG stake, existing line 9 is not produced the transverse confinement of impact by equipment, the margin of safety 10 of existing line 9 is positioned at roadbed 1 (between two toes), in the present embodiment, roadbed 1 closes on existing line 9 side toe is inner side toe, is outside toe away from existing line 9 side toe。
From toe outside roadbed 1 to margin of safety 10 in Soft Soil Layer 2 below mattress layer 6, multiple rows of rigidity CFG stake 4 is set along circuit longitudinal separation, from toe inside roadbed 1 to margin of safety 10, arrange multiple rows of flexible rotary churning pile 5 along circuit longitudinal separation in the Soft Soil Layer 2 below mattress layer 6。Namely the soft soil foundation outside existing line 9 margin of safety 10 adopts rigidity CFG stake 4, adopts flexible rotary churning pile 5 within safety clearance 10。
Rigidity CFG stake 4 is provided with pile cover 7, and pile cover 7 top flushes in flexible rotary churning pile 5 top to Soft Soil Layer 2 end face。Mattress layer 6 is laid on flexible rotary churning pile 5 and rigidity CFG stake 4 top, at the bottom of flexible rotary churning pile 5 and rigidity CFG stake 4 in Soft Soil Layer 2 to hard stratum 3。As in figure 2 it is shown, mattress layer 6 is made up of blotter 6.1, medium coarse sand bed course 6.2, direction earthwork grille the 6.3, second medium coarse sand bed course 6.4 and the second blotter 6.5 from bottom to top successively。
Between multiple rows of rigidity CFG stake 4, the distances between adjacent two row's rigidity CFG stakes 4 are equal, and often between row's rigidity CFG stake 4, the spacing of adjacent two rigidity CFG stakes 4 side by side is equal；Between multiple rows of flexible rotary churning pile 5, the distances between the adjacent two flexible rotary churning piles 5 of row are equal, and often between row's flexible rotary churning pile 5, the spacing of adjacent two flexible rotary churning piles 5 side by side is equal。In the present invention between adjacent two row's rigidity CFG stakes 4, laterally aligned arrangement or laterally staggered arrangement between the adjacent two flexible rotary churning piles 5 of row, time laterally aligned between adjacent two rows adjacent four form square arrangement；Adjacent three formation equilateral triangles between adjacent two rows time laterally staggered。Rigidity CFG stake 4 equilateral triangle arrangement as it is shown on figure 3, square arrangement as shown in Figure 4, in Fig. 3-4, left and right is to for circuit longitudinally, upward and downward be circuit laterally。No matter being square or equilateral triangle arrangement, between arbitrary neighborhood rigidity CFG stake 4, pilespacing is identical。Flexible rotary churning pile 5 is in like manner arranged with rigidity CFG stake 4, repeats no more。Wherein, flexible 5 footpath d of rotary churning pile2For 0.6-0.7m, pile spacing D2For 2-3 times of stake footpath；4 footpath d of rigidity CFG stake1For 0.5-0.6m, pile spacing D1For 3-5 times of stake footpath。
Being provided with the string stress relief hole 8 along roadbed longitudinal direction inside roadbed 1 between toe and existing line 9, stress relief hole 8 hole depth is with the degree of depth (the deep 5-13m of the present embodiment), pitch of holes 3-4m at the bottom of flexible rotary churning pile 5。Toe is outer inside roadbed 1 for the flexible rotary churning pile 5 of each row, continue to existing line 9 direction to arrange 1-2 root flexibility rotary churning pile 5, and outside roadbed 1, toe is outer in each row rigidity CFG stake 4, continue to arrange 1-2 root rigidity CFG stake 4 to away from existing line 9 direction。
The construction method of said structure of the present invention is:
A. place is flattened before stiffening basic ground, rear surveying setting-out, refer to fixed pile, from margin of safety 10 to the newly-built roadbed of design in toe (now roadbed 1 is not also laid, and determines toe position according to design) region, along the circuit longitudinally multiple rows of rigidity CFG stake 4 of construction, stake footpath d1For 0.5-0.6m, pile spacing D1It is generally adopted 3-5 times of stake footpath, the present embodiment 4 footpath d of preferred rigidity CFG stake1=0.5m, pile spacing D1=5 times of stake footpaths, square or equilateral triangle lay out pile (i.e. pile arrangement in aforementioned road structure, as shown in Figure 3-4), generally arrange from roadbed center line toward both sides toe when scene lays out pile, until outside roadbed outside toe, also continuing to be provided with 1-2 root rigidity CFG stake 4 (the present embodiment preferably 1) to away from existing line 9 direction () respectively row in Fig. 1 to the left, the long Soft Soil Layer that has to penetrate through in principle of stake, to hard formation, specifically need to be determined by settling inspection according to settlement Control standard。Rigidity CFG stake 4 top sets pile cover 7, expands pile cover, pile cover top width 0.9m, high 0.5m, cast in situs C25 concrete for circle。
B. inside the roadbed 1 of design, between toe and existing line 9, offer the string stress relief hole 8 along roadbed 1 longitudinal direction, stress relief hole 8 upper end and Soft Soil Layer 2 either flush, aperture 127mm, spacing 3m。From margin of safety 10 to the roadbed 1 of design in toe region, along the circuit longitudinally construction flexible rotary churning pile 5 of multiple rows of construction, stress relief hole 8 can reduce the flexible rotary churning pile 5 impact on existing line 9 as far as possible, and the degree of depth at the bottom of flexible rotary churning pile 5 is identical with stress relief hole 8 hole depth。Generally arrange from roadbed 1 center line toward both sides toe when scene lays out pile, until inside roadbed 1, toe is outer, also continue to be provided with 1-2 root flexibility rotary churning pile 5 (the present embodiment preferably 2), stake footpath d to closing on existing line 9 direction () respectively row in Fig. 1 to the right2For 0.6-0.7m, pile spacing D2For 2-3 times of stake footpath, the present embodiment is flexible 5 footpath d of rotary churning pile preferably2=0.6m, pile spacing D2=3 times of stake footpaths, square or equilateral triangle lay out pile (i.e. pile arrangement in aforementioned road structure), specifically need to determine by settling inspection according to settlement Control standard。Both pass through Soft Soil Layer to hard stratum at the bottom of rigidity CFG stake 4 and flexible rotary churning pile 5, stake top all to Soft Soil Layer end face, rigidity CFG stake 4 (including pile cover 7), flexible rotary churning pile 5 stake top concordant all in the horizontal direction with at the bottom of stake。
C. after rigidity CFG stake 4 and flexible rotary churning pile 5 concrete strength of pile reach design strength, rigidity CFG stake 4 and flexible rotary churning pile 5 top, Soft Soil Layer 2 top set the mattress layer 6 of 0.6m thickness, one layer of direction earthwork grille 10 of interior laying, two ends inflection is not less than 2.0m, tensile strength is not less than 110kN/m, is that 20cm blotter 6.1,10cm medium coarse sand bed course 6.2, direction earthwork grille 6.3,10cm the second medium coarse sand bed course 6.4 and 20cm the second blotter form by thickness successively from bottom to top。
D. by design roadbed paving 1 above blotter 6 of newly-built roadbed before, roadbed 1 toe edge is concordant with mattress layer transverse edge。
In the present invention, CFG pile machine equipment height reaches more than 24m, and therefore margin of safety 10 is from existing line transverse direction 23-25m, adopts CFG pile machine equipment to arrange rigidity CFG stake outside margin of safety, and CFG stake machine height will not cause danger to both wired；Inner side adopts the rotary churning pile equipment of height 3m to arrange rotary churning pile, has both protected both Wired Security also can improve efficiency of construction。
Claims (10)
1. a process closes on the construction method of both wired soft soil foundations, it is characterised in that step is:
A. place is flattened, in from margin of safety (10) to the roadbed (1) toe region away from existing line (9) side of design, along the circuit longitudinally multiple rows of rigidity CFG stake (4) of construction；
B. close on the flexible rotary churning pile (5) of multiple rows of construction of longitudinally constructing in the toe region of existing line (9) side, along circuit to the roadbed (1) of design from margin of safety (10), both passing through Soft Soil Layer (2) to hard stratum (3) at the bottom of described rigidity CFG stake (4) and flexible rotary churning pile (5) stake, stake top is all to Soft Soil Layer end face；
C., after rigidity CFG stake (4), flexible rotary churning pile (5) concrete reach design strength, longitudinally mattress layer (6) is laid at rigidity CFG stake (4), flexible rotary churning pile (5) top, Soft Soil Layer (2) top along circuit；
D. by design at mattress layer (6) top roadbed paving (1), described roadbed (1) toe edge is concordant with blotter (6) transverse edge。
2. construction method as claimed in claim 1, it is characterised in that described rigidity CFG stake (4) is provided with pile cover (7), described pile cover (7) top flushes in flexible rotary churning pile (5) top。
3. construction method as claimed in claim 1, it is characterized in that, step a respectively arranges outside the rigidity CFG stake (4) roadbed (1) in the design toe away from existing line (9) side, continue to arrange 1-2 root rigidity CFG stake (4) to away from existing line (9) direction；In step b, the flexible rotary churning pile (5) of each row is closed on outside the toe of existing line (9) side at the roadbed (1) of design, is continued to arrange 1-2 root flexibility rotary churning pile (5) to existing line (9) direction。
4. construction method as claimed in claim 1, it is characterised in that described flexible rotary churning pile (5) stake footpath is 0.6-0.7m, and pile spacing is 2-3 times of stake footpath；Described rigidity CFG stake (4) stake footpath is 0.5-0.6m, and pile spacing is 3-5 times of stake footpath。
5. construction method as claimed in claim 1, it is characterized in that, in step b before the flexible rotary churning pile (5) of construction, construct between the roadbed (1) and existing line (9) of design along the string stress relief hole (8) of circuit longitudinal direction, described stress relief hole (8) hole depth is with the degree of depth, spacing 3-4m at the bottom of flexible rotary churning pile (5) stake。
6. construction method as claimed in claim 1, it is characterized in that, between multiple rows of rigidity CFG stake (4), the distances between adjacent two rows rigidity CFG stake (4) are equal, and often between row's rigidity CFG stake (4), the spacing of adjacent two rigidity CFG stakes (4) side by side is equal；Between multiple rows of flexible rotary churning pile (5), the distances between the adjacent two flexible rotary churning piles (5) of row are equal, and often between row's flexible rotary churning pile (5), the spacing of adjacent two flexible rotary churning piles (5) side by side is equal。
7. construction method as claimed in claim 6, it is characterised in that between adjacent two rows' rigidity CFG stake (4), laterally aligned or laterally staggered arrangement between the adjacent two flexible rotary churning piles (5) of row。
8. a process closes on the road structure of both wired soft soil foundations, it is characterized in that, including being laid on the mattress layer (6) at Soft Soil Layer (2) top and being laid on mattress layer (6) top, close on the roadbed (1) of existing line (9), described mattress layer (6) lower section is from margin of safety (10) to roadbed (1) in toe region away from existing line (9) side, along the longitudinally disposed multiple rows of rigidity CFG stake (4) of circuit, described mattress layer (6) lower section is closed in the toe region of existing line (9) side from margin of safety (10) to roadbed (1), along the longitudinally disposed multiple rows of flexible rotary churning pile (5) of circuit, Soft Soil Layer (2) is both passed through to hard stratum (3) at the bottom of described flexible rotary churning pile (5) and rigidity CFG stake (4) stake, stake top is all to Soft Soil Layer end face。
9. road structure as claimed in claim 8, it is characterised in that described flexible rotary churning pile (5) stake footpath is 0.6-0.7m, and pile spacing is 2-3 times of stake footpath；Described rigidity CFG stake (4) stake footpath is 0.5-0.6m, and pile spacing is 3-5 times of stake footpath。
10. road structure as claimed in claim 8, it is characterized in that, described mattress layer (6) is laid by blotter (6.1), medium coarse sand bed course (6.2), direction earthwork grille (6.3), the second medium coarse sand bed course (6.4) and the second blotter (6.5) successively from bottom to top and is formed。
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| CN201610208948.5A CN105696426B (en) | 2016-04-06 | 2016-04-06 | It is a kind of to handle the construction method and its road structure for closing on both wired soft soil foundations |
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| CN201610208948.5A CN105696426B (en) | 2016-04-06 | 2016-04-06 | It is a kind of to handle the construction method and its road structure for closing on both wired soft soil foundations |
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| CN105696426B CN105696426B (en) | 2018-06-12 |
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| CN109853313B (en) * | 2019-01-17 | 2024-04-30 | 浙江绿艺建设有限公司 | Pile foundation side soft soil foundation road friction resistance eliminating structure and construction method |
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| CN113718560B (en) * | 2021-09-30 | 2022-12-27 | 中铁二局集团有限公司 | Intelligent monitoring-based construction method for coordinative settlement control of adjacent existing line retaining wall type high-speed railway foundation |
| CN114320371A (en) * | 2022-01-05 | 2022-04-12 | 中铁二局第一工程有限公司 | Construction method for controlling deformation of operation track by isolated grouting |
| CN114808554A (en) * | 2022-05-07 | 2022-07-29 | 中铁二院贵阳勘察设计研究院有限责任公司 | Ballastless track foundation of high-speed railway and processing method |
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