CN109098203A

CN109098203A - Plateau Permafrost Regions reinforced earth retaining wall and its construction method

Info

Publication number: CN109098203A
Application number: CN201810876573.9A
Authority: CN
Inventors: 王多青; 高志伟; 王向阳; 李成; 田世军; 孙良鑫; 张广丰; 胡金山; 高平军; 黄学杰
Original assignee: China Railway First Survey and Design Institute Group Ltd
Current assignee: China Railway First Survey and Design Institute Group Ltd
Priority date: 2018-08-03
Filing date: 2018-08-03
Publication date: 2018-12-28

Abstract

The invention relates to a reinforced soil retaining wall in a plateau permafrost region and a construction method thereof. The wall structure is a multi-layer filling structure formed by filling layer by layer from bottom to top, and the bottom surface of each layer of filling structure is provided with pulleys. The geogrid composed of ribs; the lateral sides of the multi-layer filling structure are inclined planes, and the concrete modules are built from bottom to top to cover the surface of the inclined plane, and the tension bars in the filling structure extend into the gap between the upper and lower concrete modules and Secured by bolts. The base of the retaining wall of the present invention is provided with a layer of flakes, which is beneficial to increase the cold storage capacity of the foundation of the retaining wall, actively reduce the ground temperature, protect the permafrost, and control the thawing of the foundation within the limit of the overall deformation coordination ability of the reinforced earth retaining wall; The base flake layer is a flexible structure, which can attenuate the frost heave force of the foundation, so that the frost heave of the foundation can be controlled within the overall deformation coordination limit of the reinforced soil retaining wall; The failure of the tie bars leads to the instability of the retaining wall.

Description

Plateau Permafrost Regions reinforced earth retaining wall and its construction method

Technical field

The present invention relates to traffic engineering construction technique fields, and in particular to a kind of Plateau Permafrost Regions reinforced earth retaining wall And its construction method.

Background technique

Plateau Permafrost Regions land used width is occupied to reduce railway bed, setting reinforced earth bulkhead is one important Environmental protection measure.Reinforced earth retaining wall major advantage be easy construction, it is cheap, account for soil less, have attractive appearance, be adapted to compared with Big foundation deformation, and compared with other types of soil-baffling structure, there is good anti-seismic performance.

But in Permafrost Area, due to multifactor impacts such as climate, ecology, microrelief, hydrologic condition, human activities, Biggish thaw collapse, frost-heaving deformation can occur for permanent frozen soil foundation, directly built on this ground reinforced earth retaining wall be can not Capable.

Summary of the invention

The object of the present invention is to provide a kind of Plateau Permafrost Regions reinforced earth retaining wall and its construction methods, suitable for melting The heavy biggish permanent frozen soil foundation of frost heave.

The technical scheme adopted by the invention is as follows:

Plateau Permafrost Regions reinforced earth retaining wall, it is characterised in that:

The wall body structure of the reinforced earth retaining wall is successively to fill the multilayer earthfill structure to be formed from bottom to top, the every layer of knot that bankets Structure bottom surface is provided with the TGXG being made of lacing wire；

The both lateral sides of multilayer earthfill structure are inclined-plane, and the surface on the inclined-plane of code building concrete module covering from bottom to top, banket knot Lacing wire in structure is extended in the gap of upper layer and lower layer concrete modular and is fixed by bolt.

By the TGXG that lacing wire forms include two parts in wall multilayer earthfill structure:

A part is construction lacing wire, is located at earthfill structure both lateral sides, and extend in the gap of upper layer and lower layer concrete modular And it is fixed by bolt；

Another part is stress main reinforcement, and tunneling boring is arranged in earthfill structure.

Stress main reinforcement includes left and right two parts, and middle part overlaps up and down.

Stress main reinforcement end is folded upward at, and is formed back and is wrapped up in lacing wire.

Be provided with the biggish cap stone of area of section at the top of concrete modular, concrete modular bottom be provided with area of section compared with Big concrete foundation.

The bottom of the wall of reinforced earth retaining wall is argillic horizon and ragstone layer from bottom to top, and top surface is from middle line to both lateral sides It is arranged to slope surface, outside the wall of both lateral sides making to reinforced earth retaining wall；

Slabstone layer surface is provided with one layer of rubber synthetic fibers geotextiles.

Multilayer earthfill structure top surface is arranged to slope surface from middle line to both lateral sides, and fills surface layer of subgrade bed filler and form bedding Surface layer, surface layer of subgrade bed bottom surface are provided with one layer of rubber synthetic fibers geotextiles.

Loaded filter is provided between concrete modular and multilayer earthfill structure.

The vertical pin hole for being prefabricated with perforation on concrete modular and not penetrating through is drawn by the way that the bolt in pin hole is fixed Muscle.

The construction method of Plateau Permafrost Regions reinforced earth retaining wall, it is characterised in that:

The following steps are included:

Step 1: one layer of waterproof soil layer is filled in substrate, filler is cohesive soil, dirt or Cement Soil, thickness 0.3m, top surface It is made into outside 4% draining horizontal slope；Cooperate the washer stone that inclines to construct using bull-dozer or excavator, is once poured onto design thickness, side slope Slabstone is suitably regular；With the fritter stone of 0.1~0.2m partial size on the levelling surface layer of washer stone overall with range of inclining, using heavy type vibration pressure Road machine, which rolls, to incline washer stone 6~8 times；Intermediate longitudinal progress behind elder generation two sides, is rolled, the capable be overlapped 0.4m between row repeatedly when rolling More than, front and back abutting lot is overlapped 2.0m or more, and number of rolling is determined by test, and measurement, which is subject to, to roll rear absolute altitude and stablize；Piece Rock layers top surface is laid with rubber synthetic fibers geotextiles；

Step 2: batch production dry wall surface concrete module reserves drain hole and pin hole, and precast reinforced bolt cuts structure It makes lacing wire, stress lacing wire and returns and wrap up in both lacing wires and be integrated；

Step 3: the construction line-putting, every 10m are one section, and pay attention to reserved expansion joint, width 0.2m；

Step 4: cast-in-place strip concrete foundation, every segment length control is within 2m；

Step 5: it is laid with construction lacing wire, forms TGXG, dry masonry first layer concrete modular；

Step 6: paving stress lacing wire forms TGXG, and when overlapping is separated with filler；

Filler: being poured in the TGXG completed by step 7 with loading machine, suitable with spilling after excavation or the smooth filler of bull-dozer The water of amount, with road roller by filling compaction；It is tamped in away from 1 meter of concrete modular barricade with light-duty machinery；

Step 8: returning and wrap up in filler, and sand folder cobble loaded filter of constructing；

Step 9: dry masonry second layer concrete modular, upper and lower module are fixed with bolt；

Step 10: upper and lower module is staggered, and avoids the occurrence of vertical straight joint；

Step 11: after the completion of concrete modular construction, cast-in-place cap stone and wall top railing of constructing；Cap stone length control 2m with It is interior；

Step 12: surface layer of subgrade bed bottom surface is laid with rubber synthetic fibers geotextiles；

Step 13: surface layer of subgrade bed filler is filled.

The invention has the following advantages that

1, a synusia rock layers are arranged in retaining wall substrate of the present invention, be conducive to increase the cold reserves of retaining wall ground, actively reduce ground temperature, Ever-frozen ground is protected, makes foundation thaw collapse control in reinforced earth retaining wall overall deformation coordination ability limit.

2, substrate ragstone layer category flexible structure of the present invention, can decay ground frost-heave force, make foundation frost heaving control in reinforced earth In retaining wall overall deformation coordination ability limit.

3, present invention setting construction lacing wire connection wall face mould block and reinforcing body, it may be assumed that construction lacing wire one end is placed in up and down two Between layer module, module and reinforcing body are linked together using the frictional force between upper and lower module and lacing wire, can effectively avoid because adding The phenomenon that lacing wire fracture causes retaining wall unstability generation.

Detailed description of the invention

Fig. 1 is structure of the invention figure；

Fig. 2 is that lacing wire is laid with schematic diagram；

Fig. 3 is lacing wire and module connection diagram；

Fig. 4 is A pattern block elevation；

Fig. 5 is A pattern block plan view；

Fig. 6 is A pattern block side view；

Fig. 7 is Type B module elevation；

Fig. 8 is Type B module flat figure；

Fig. 9 is Type B module side view.

In figure, 1- rubber synthetic fibers geotextiles, 2- surface layer of subgrade bed, 3- cap stone, 4- concrete modular, 5- loaded filter, 6- Bolt, 7- lacing wire, 8- concrete foundation, 9- ragstone layer, 10- banket, 11- argillic horizon, 12- seasonally thaw layer, and 13- frozen soil is natural The upper limit, 14- ever-frozen ground, 15-, which is returned, wraps up in lacing wire, and 16- constructs lacing wire, 17- stress main reinforcement, 18- pin hole.

Specific embodiment

The present invention will be described in detail With reference to embodiment.

The present invention relates to a kind of Plateau Permafrost Regions reinforced earth retaining wall, the wall body structure of the reinforced earth retaining wall is The multilayer earthfill structure to be formed successively is filled from bottom to top, and every layer of earthfill structure bottom surface is provided with the geotechnique being made of lacing wire 7 Grid；The both lateral sides of multilayer earthfill structure are inclined-plane, and code building concrete module 4 covers the surface on inclined-plane from bottom to top, are banketed Lacing wire 7 in structure extends in the gap of upper layer and lower layer concrete modular 4 and fixed by bolt 6.Concrete modular 4 and more Loaded filter 5 is provided between layer earthfill structure.

By the TGXG that lacing wire 7 forms include two parts in wall multilayer earthfill structure: a part is construction lacing wire 16, Positioned at earthfill structure both lateral sides, and extend in the gap of upper layer and lower layer concrete modular 4 and fixed by bolt 6；It is another Part is stress main reinforcement 17, and tunneling boring is arranged in earthfill structure.Stress main reinforcement 17 includes left and right two parts, and middle part is taken up and down It connects.17 end of stress main reinforcement is folded upward at, and is formed back and is wrapped up in lacing wire 15, is returned and is wrapped up in lacing wire 15 and be entirely located in this layer of earthfill structure.

The biggish cap stone 3 of area of section is provided at the top of concrete modular 4,4 bottom of concrete modular is provided with section face The biggish concrete foundation 8 of product.The vertical pin hole 18 for being prefabricated with perforation on concrete modular 4 and not penetrating through, passes through bolt The fixed lacing wire 7 of bolt 6 in hole 18.Drain hole is also prefabricated on concrete modular 4, drain hole is micro- downwards from inside to outside to incline.It is mixed Solidifying clay model block 4 can be prefabricated into A, B two types, of different size, be adjusted flexibly when building convenient for fissure of displacement code, thereon prefabricated pin hole 18 quantity, position and depth is flexibly determined all in accordance with practice of construction situation.

The bottom of the wall of reinforced earth retaining wall is argillic horizon 11 and ragstone layer 9 from bottom to top, and top surface is from middle line to transverse direction Two sides are arranged to slope surface, outside the wall of both lateral sides making to reinforced earth retaining wall；9 surface of ragstone layer is provided with one layer of rubber and closes At fiber earthwork cloth 1.Multilayer earthfill structure top surface is arranged to slope surface from middle line to both lateral sides, and fills surface layer of subgrade bed filler shape At surface layer of subgrade bed 2,2 bottom surface of surface layer of subgrade bed is provided with one layer of rubber synthetic fibers geotextiles 1.

The construction method of above-mentioned Plateau Permafrost Regions reinforced earth retaining wall, comprising the following steps:

Step 1: one layer of waterproof soil layer is filled in substrate, filler is cohesive soil, dirt or Cement Soil, thickness 0.3m, top surface It is made into outside 4% draining horizontal slope；Cooperate the washer stone that inclines to construct using bull-dozer or excavator, is once poured onto design thickness, side slope Slabstone is suitably regular；With the fritter stone of 0.1~0.2m partial size on the levelling surface layer of washer stone overall with range of inclining, using heavy type vibration pressure Road machine, which rolls, to incline washer stone 6~8 times；Intermediate longitudinal progress behind elder generation two sides, is rolled, the capable be overlapped 0.4m between row repeatedly when rolling More than, front and back abutting lot is overlapped 2.0m or more, and number of rolling is determined by test, and measurement, which is subject to, to roll rear absolute altitude and stablize；Piece Rock layers top surface is laid with rubber synthetic fibers geotextiles 1；

Step 2: batch production dry wall surface concrete module 4 reserves drain hole and pin hole 18, and precast reinforced bolt 6 is cut out It cuts construction lacing wire 16, stress lacing wire 17 and returns and wrap up in both lacing wires 15 and be integrated；

Step 4: cast-in-place strip concrete foundation 8, every segment length control is within 2m；

Step 5: it is laid with construction lacing wire 16, forms TGXG, dry masonry first layer concrete modular 4；

Step 6: paving stress lacing wire 17 forms TGXG, and when overlapping is separated with filler；

Filler: being poured in the TGXG completed by step 7 with loading machine, suitable with spilling after excavation or the smooth filler of bull-dozer The water of amount, with road roller by filling compaction；Using light-duty machines such as frog rammer or plate compactors in 1 meter away from 4 barricade of concrete modular Tool compacting.Light-duty machinery gross mass is not more than 1 ton；

Step 9: dry masonry second layer concrete modular 4, upper and lower module are fixed with bolt 6；

Step 10: upper and lower module is staggered, and avoids the occurrence of vertical straight joint；It should be noted that A, the collocation of Type B module are used when laid dry module；

Step 11: after the completion of concrete modular 4 is constructed, cast-in-place cap stone 3 and wall top railing of constructing；Cap stone length control 2m with It is interior；

Step 12: surface layer of subgrade bed bottom surface is laid with rubber synthetic fibers geotextiles 1；

Step 13: 2 filler of surface layer of subgrade bed is filled.

The contents of the present invention are not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention And to any equivalent transformation that technical solution of the present invention is taken, all are covered by the claims of the invention.

Claims

1. Reinforced earth retaining wall in plateau permafrost region, characterized by:

The wall structure of the reinforced soil retaining wall is a multi-layer filling structure formed by filling layer by layer from bottom to top, and the bottom surface of each layer of filling structure is provided with a geogrid composed of tie bars (7);

The horizontal sides of the multi-layer fill structure are inclined surfaces, and the concrete modules (4) are built from bottom to top to cover the surface of the inclined surface, and the tie bars (7) in the fill structure extend to the gap between the upper and lower layers of concrete modules (4) center and secure with the pin (6).

2. The plateau permafrost region reinforced earth retaining wall according to claim 1, characterized in that:

The geogrid composed of tie bars (7) in the wall multi-layer fill structure consists of two parts:

One part is the structural tie (16), which is located on the lateral sides of the filling structure, and extends into the gap between the upper and lower concrete modules (4) and is fixed by the bolt (6);

The other part is the stressed main reinforcement (17), which is set in full section in the filling structure.

3. The plateau permafrost region reinforced earth retaining wall according to claim 2, characterized in that:

Stressed main tendon (17) comprises left and right two parts, and middle part overlaps up and down.

4. The plateau permafrost region reinforced earth retaining wall according to claim 2, characterized in that:

The ends of the stressed main tendons (17) are bent upwards to form back-wrapped tendons (15).

5. The plateau permafrost region reinforced soil retaining wall according to claim 1, characterized in that:

The top of the concrete module (4) is provided with a capstone (3) with a large cross-sectional area, and the bottom of the concrete module (4) is provided with a concrete foundation (8) with a large cross-sectional area.

6. The plateau permafrost region reinforced earth retaining wall according to claim 1, characterized in that:

The bottom of the reinforced soil retaining wall consists of a clay layer (11) and a flake layer (9) from bottom to top. outside the wall of the retaining wall;

A layer of rubber synthetic fiber geotextile (1) is arranged on the surface of the flake layer (9).

7. The plateau permafrost region reinforced earth retaining wall according to claim 1, characterized in that:

The top surface of the multi-layer soil filling structure is set as a slope from the center line to the lateral sides, and the surface layer of the subgrade bed is filled with fillers to form the surface layer of the subgrade bed (2), and a layer of rubber synthetic fiber geotextile (1 ).

8. The plateau permafrost region reinforced soil retaining wall according to claim 1, characterized in that:

A reverse filter layer (5) is arranged between the concrete module (4) and the multi-layer earth filling structure.

9. The plateau permafrost region reinforced soil retaining wall according to claim 1, characterized in that:

The concrete module (4) is prefabricated with through and non-through vertical pin holes (18), and the tie bars (7) are fixed through the pins (6) in the pin holes (18).

10. The construction method of the reinforced earth retaining wall in the plateau permafrost region, characterized in that:

Include the following steps:

Step 1: Fill a layer of waterproof soil on the base, the filler is cohesive soil, lime soil or cement-improved soil, the thickness is 0.3m, and the top surface is made into a 4% drainage horizontal slope; use bulldozers or excavators to cooperate with pouring rubble for construction , dumped to the design thickness at one time, and the slope rubble is properly regular; use small stones with a particle size of 0.1 to 0.2m to level the surface layer over the full width of the rubble, and use a heavy-duty vibratory roller to roll the rubble for 6 to 8 times; Carry out longitudinally on both sides first and then in the middle, repeatedly rolling, overlapping between rows by more than 0.4m, and overlapping by more than 2.0m between front and rear adjacent sections, the number of rolling times is determined by the test, and the measurement is based on the stability of the elevation after rolling ; The top surface of the flake layer is laid with rubber synthetic fiber geotextile (1);

Step 2: Factory prefabricated wall concrete modules (4), reserved drain holes and pin holes (18), prefabricated steel bar pins (6), cut structural ties (16), stressed ties (17) and Back-wrapping and stretching (15) the two are integrated;

Step 3: Construction setting out, every 10m is a section, and pay attention to reserve expansion joints, the width is 0.2m;

Step 4: cast-in-place strip concrete foundation (8), the length of each section is controlled within 2m;

Step 5: laying structural reinforcement (16), forming a geogrid, and dry-building the first layer of concrete modules (4);

Step 6: Laying tension bars (17) to form a geogrid, and separating them with fillers when overlapping;

Step 7: Use a loader to dump the filler on the paved geogrid, use an excavator or a bulldozer to level the filler and sprinkle an appropriate amount of water, and use a road roller to compact the filler; within 1 meter from the retaining wall of the concrete module (4) Use light mechanical compaction;

Step 8: Wrap the filler back, and construct the sand and pebble reverse filter layer;

Step 9: dry-build the second layer of concrete modules (4), and fix the upper and lower modules with bolts (6);

Step 10: Stagger the upper and lower modules to avoid vertical joints;

Step 11: After the construction of the concrete module (4) is completed, cast the capstone (3) and construct the railing on the top of the wall; the length of the capstone should be controlled within 2m;

Step 12: Lay rubber synthetic fiber geotextile (1) on the surface and bottom of the foundation bed;

Step 13: Fill the surface layer of the foundation bed (2) filler.