CN111560808A - Deep covering layer landslide section filling roadbed retaining structure and construction method - Google Patents
Deep covering layer landslide section filling roadbed retaining structure and construction method Download PDFInfo
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- CN111560808A CN111560808A CN202010454457.5A CN202010454457A CN111560808A CN 111560808 A CN111560808 A CN 111560808A CN 202010454457 A CN202010454457 A CN 202010454457A CN 111560808 A CN111560808 A CN 111560808A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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Abstract
The invention discloses a supporting and retaining structure for a filling roadbed in a deep covering layer landslide section, which comprises front row of anti-slide piles and rear row of anti-slide piles, wherein the front row of anti-slide piles and the rear row of anti-slide piles are respectively arranged on two sides of the filling roadbed; the top of the pile top longitudinal joist is respectively and longitudinally provided with foundation widening type reinforced concrete thin-wall retaining walls, and split thread reinforcing steel bars used for fixing the retaining walls are arranged between the thin-wall retaining walls. The method has the characteristics of economy, reasonableness, convenience in construction, clear structural stress, effective control of subgrade settlement and horizontal displacement, reduction of construction cost and the like, ensures the safety of filling subgrades in deep landslide sections, and provides reference for design and construction of filling subgrades in deep landslide sections.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a supporting and retaining structure of a filling roadbed in a landslide section with a deep covering layer and a construction method.
Background
In the prior art, part of the anti-slide pile adopts a prestressed anchor cable to control the horizontal displacement of the pile top of the anti-slide pile, but when the prestressed anchor cable is adopted in a landslide section with a deep covering layer, an anchoring section is positioned in the covering layer, and the prestressed anchor cable is easy to generate a stress relaxation phenomenon, so that the anti-slide pile is failed. When the miniature slide-resistant piles are adopted, pile group effect is easy to generate due to small pile spacing, the slide-resistant capacity of a single pile is reduced to some extent, and waste phenomenon to a certain extent is generated. The variable cross-section slide-resistant pile has better stress performance, but is difficult to construct on site. The anti-slide pile rows are simple in structure, good in treatment effect, long in construction period and relatively high in construction cost. The scheme of the anti-slide pile and the pile top reinforced concrete retaining wall is characterized in that the partial section of the foundation of the reinforced concrete retaining wall is suspended, the stress concentration phenomenon of the foundation of the reinforced concrete retaining wall is obvious, the horizontal displacement of the wall top of the retaining wall is relatively large, the settlement deformation phenomenon of a roadbed is obvious, and the potential safety hazard of a certain degree exists.
Relevant research data show that when the front row of anti-slide piles and the rear row of anti-slide piles are arranged in parallel, bending moment, shearing force and displacement are larger than those of the front row of anti-slide piles and the rear row of anti-slide piles arranged in a shape like a Chinese character 'pin', so that the pile diameter size and the steel bar consumption of the door type double-row anti-slide piles (namely the front row of anti-slide piles and the rear row of anti-slide piles are arranged in parallel) are larger than those of the door type double-row anti-.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, anti-slide piles in a deep overburden landslide section fail to work, pile group effect is generated, single-pile anti-slide capability is weak, construction period is long and construction cost is high when a plurality of anti-slide pile rows are adopted, horizontal displacement of the top of a retaining wall is relatively large, subgrade settlement deformation is obvious, and potential safety hazards exist to a certain extent.
The invention is realized by the following technical scheme:
a supporting and retaining structure for a filling roadbed at a deep covering layer landslide section comprises front row anti-slide piles and rear row anti-slide piles which are arranged on two sides of the filling roadbed respectively, wherein the front row anti-slide piles and the rear row anti-slide piles penetrate through a sliding surface of the covering layer landslide and are extended out of the ground, the front row anti-slide piles and the rear row anti-slide piles are arranged in a staggered mode along the central line direction of a road of the filling roadbed, front row pile top longitudinal supporting beams connected with the front row anti-slide piles are longitudinally arranged at the tops of the front row anti-slide piles, rear row pile top longitudinal supporting beams connected with the rear row anti-slide piles are longitudinally arranged at the tops of the rear row anti-slide piles, and transverse connecting beams and oblique connecting beams are arranged between the front row pile top longitudinal supporting beams and the rear row pile top longitudinal supporting beams; the front row of thin-wall retaining walls and the rear row of thin-wall retaining walls are both foundation-widened reinforced concrete thin-wall retaining walls, counter-pulling thread reinforcing steel bars are arranged between the front row of thin-wall retaining walls and the rear row of thin-wall retaining walls, and the counter-pulling thread reinforcing steel bars are used for fixing the front row of thin-wall retaining walls and the rear row of thin-wall retaining walls.
The front row of anti-slide pile top longitudinal joist and the rear row of anti-slide pile top longitudinal joist respectively connect the front row of anti-slide piles and the rear row of anti-slide piles together, the anti-slide pile top longitudinal joist is stressed together, and the front row of anti-slide pile top longitudinal joist and the rear row of anti-slide pile top longitudinal joist form an hyperstatic structure through the transverse connecting beam and the oblique connecting beam.
The front row of anti-slide piles and the rear row of anti-slide piles are arranged at intervals, so that the two rows of piles bear landslide thrust more reasonably, and the bending moment of the single row of anti-slide piles is reduced; meanwhile, the longitudinal joists of the pile tops of the front row of anti-slide piles and the rear row of anti-slide piles and the N-shaped connecting beams (comprising the transverse connecting beams and the oblique connecting beams) between the two longitudinal joists enable the two rows of anti-slide piles to form an integral anti-slide and load-bearing structure, and horizontal displacement of the pile tops is reduced; and the top of the longitudinal joist of the front row of anti-slide piles and the top of the longitudinal joist of the rear row of anti-slide piles are provided with split thread steel bars and a foundation widened type reinforced concrete retaining wall, so that the length of cantilever sections of the anti-slide piles can be effectively reduced, the length and the size of the anti-slide piles are reduced, and the subgrade settlement and the horizontal displacement are effectively controlled.
Furthermore, the front row thin-wall retaining wall with the back row thin-wall retaining wall all is provided with a plurality of anchor rod holes, to drawing the twisted steel and passing the anchor rod hole, to drawing the twisted steel and passing the tip in anchor rod hole sets gradually steel backing plate and nut, to drawing the twisted steel the steel backing plate with the nut is used for fixing the front row thin-wall retaining wall with the relative position of back row thin-wall retaining wall.
Further, the front row of anti-slide piles and the rear row of anti-slide piles are sequentially arranged according to the moving direction of the slide body.
Furthermore, the positions of the transverse connecting beam and the oblique connecting beam are in an N shape.
Further, one end of the transverse connecting beam is located at the position of the longitudinal joist corresponding to the slide-resistant piles, and the other end of the transverse connecting beam is located at the position of the middle point between the two slide-resistant piles corresponding to the longitudinal joist; one end of the oblique connecting beam is located at the position, corresponding to the slide-resistant piles, of the front row pile top longitudinal joist, and one end of the oblique connecting beam is located at the position, corresponding to the slide-resistant piles, of the rear row pile top longitudinal joist.
Furthermore, the side wall of the foundation widening type reinforced concrete thin-wall retaining wall is provided with a plurality of drainage holes which are arranged at intervals.
Further, the front row of slide-resistant piles and the rear row of slide-resistant piles are square piles and/or columns. Round piles are used when the overburden is loose or groundwater is present.
Further, the construction method of the supporting and retaining structure of the filling roadbed in the landslide section with the deep covering layer comprises the following steps:
s01: calculating the landslide thrust of the covering layer of the deep covering layer landslide section;
s02: according to the landslide thrust data of the covering layer, respectively arranging front row anti-slide piles and rear row anti-slide piles on the outer side and the inner side of the filling roadbed, wherein the front row anti-slide piles and the rear row anti-slide piles are arranged in a staggered mode according to the center line direction of the road, and jumping piles from two sides of a deep covering layer landslide section to the middle of the deep covering layer landslide section;
s03: binding an anti-slide pile reinforcement cage, hoisting the anti-slide pile reinforcement cage, and pouring concrete, wherein the concrete is not poured within the range of 1.5m below the pile top of the anti-slide pile;
s04: arranging a longitudinal reinforced concrete joist on the pile top of the slide-resistant pile along the road line in the longitudinal direction, wherein the size of the bottom surface of the longitudinal reinforced concrete joist is matched with that of the top surface of the slide-resistant pile, and the thickness of the longitudinal reinforced concrete joist is 1.0-2.0 m;
s05: a transverse connecting beam and an oblique connecting beam are arranged between the two rows of longitudinal reinforced concrete joists, and reinforcing steel bars of the transverse connecting beam and reinforcing steel bars of the oblique connecting beam are bound; the thickness of the transverse connecting beam and the oblique connecting beam is smaller than that of the longitudinal reinforced concrete joist;
s06: pouring concrete of front-row longitudinal reinforced concrete joists, rear-row longitudinal reinforced concrete joists, transverse connecting beams and oblique connecting beams within the range of 1.5m at the top of the anti-slide pile;
s07: binding reinforcing steel bars of the foundation widened type reinforced concrete thin-wall retaining wall on the tops of the two longitudinal joists, solidifying the foundation widened type reinforced concrete retaining wall and the longitudinal joists by adopting connecting reinforcing steel bars, and arranging an anchor rod hole and a drain hole in the foundation widened type reinforced concrete thin-wall retaining wall;
s08: pouring concrete of the foundation widening type reinforced concrete retaining wall;
s09: filling and rolling the filled roadbed layer by layer, constructing split thread reinforcing steel bars according to the filling height, respectively penetrating the anchor rod holes at two ends of the split thread reinforcing steel bars, arranging steel backing plates and nuts at the end parts of two sides of the split thread reinforcing steel bars, and fixing the thread reinforcing steel bars on the foundation widened reinforced concrete retaining wall body by the steel backing plates and the nuts;
s10: monitoring the settlement deformation and horizontal displacement of the road surface of the filling roadbed at any time;
s11: and adjusting the positions of nuts at two ends of the split thread reinforcing steel bars according to the monitoring results of the settlement deformation and the horizontal displacement of the road surface of the filling roadbed.
Further, the height of the foundation widening type reinforced concrete retaining wall is 1.0-2.0m, and the wall thickness is 0.3-0.5 m.
Furthermore, when the covering layer is loose or underground water exists, namely potential safety hazards exist in manual hole digging pile construction, mechanical hole drilling piles or mechanical hole digging piles are adopted.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method has the characteristics of economy, reasonableness, convenience in construction, clear structural stress, effective control of subgrade settlement and horizontal displacement, reduction of construction cost and the like, ensures the safety of filling subgrades in deep landslide sections, and provides reference for design and construction of filling subgrades in deep landslide sections.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic plan view of a supporting and retaining structure of a filling roadbed in a deep overburden landslide section;
FIG. 2 is a schematic cross-sectional view of a supporting structure of a filling roadbed in a deep overburden landslide section;
fig. 3 is a schematic longitudinal section view of a supporting structure of a filling roadbed in a landslide section with a deep covering layer.
Reference numbers and corresponding part names in the drawings:
1-road center line, 2-front row anti-slide piles, 3-rear row anti-slide piles, 4-front row pile top longitudinal joist, 5-rear row pile top longitudinal joist, 6-transverse connecting beam, 7-oblique connecting beam, 8-split thread steel bar, 9-steel backing plate, 10-nut, 11-foundation widening type reinforced concrete thin-wall retaining wall, 12-drainage hole, 13-road surface and 14-overburden landslide sliding surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1 and fig. 2, this embodiment 1 is a supporting and retaining structure for a filled roadbed in a deep overburden landslide section, and includes front row of anti-slide piles 2 and rear row of anti-slide piles 3 respectively disposed on both sides of the filled roadbed, the front row of anti-slide piles 2 and the rear row of anti-slide piles 3 are sequentially arranged according to the moving direction of a sliding body, the front row of anti-slide piles 2 and the rear row of anti-slide piles 3 both pass through a landslide sliding surface of the overburden, and extend out of the ground, the front row of anti-slide piles 2 and the rear row of anti-slide piles 3 are staggered along a central line 1 direction of the fill road, a front row of pile top longitudinal joists 4 connected with the front row of anti-slide piles 2 are longitudinally disposed on the top of the front row of anti-slide piles 2, a rear row of pile top longitudinal joists 5 connected with the rear row of anti-slide piles 3 are longitudinally disposed on the top of the rear row of anti-slide piles, a transverse connecting tie beam 6 and an oblique connecting tie beam 7 are disposed between the front row of pile top longitudinal joists 4 and the rear row of.
The top of the front row of pile top longitudinal joist 4 and the top of the rear row of pile top longitudinal joist 5 are respectively and longitudinally provided with a front row thin-wall retaining wall and a rear row thin-wall retaining wall, the front row thin-wall retaining wall and the rear row thin-wall retaining wall are both foundation widening type reinforced concrete thin-wall retaining walls 11, a counter-pulling thread steel bar 8 is arranged between the front row thin-wall retaining wall and the rear row thin-wall retaining wall, and the counter-pulling thread steel bar 8 is used for fixing the front row thin-wall retaining wall and the rear row thin-wall retaining wall.
The front row thin-wall retaining wall and the rear row thin-wall retaining wall are provided with a plurality of anchor rod holes, the opposite-pulling thread steel bars 8 penetrate through the anchor rod holes, the end parts, penetrating through the anchor rod holes, of the opposite-pulling thread steel bars 8 are sequentially provided with the steel backing plate 9 and the nuts 10, and the opposite-pulling thread steel bars, the steel backing plate 9 and the nuts 10 are used for fixing the relative positions of the front row thin-wall retaining wall and the rear row thin-wall retaining wall.
One end of the transverse connecting beam 6 is positioned at the position of the longitudinal joist corresponding to the slide-resistant piles, and the other end is positioned at the position of the middle point between the longitudinal joist corresponding to the two slide-resistant piles; one end of the oblique connecting beam 7 is positioned at the position of the front row pile top longitudinal joist 4 corresponding to the slide-resistant pile, and one end of the oblique connecting beam 7 is positioned at the position of the rear row pile top longitudinal joist 5 corresponding to the slide-resistant pile.
As shown in fig. 3, the sidewall of the foundation widening type reinforced concrete thin-walled retaining wall 11 is provided with a plurality of drainage holes 12 and anchor rod holes, which are not shown in the drawing, arranged at intervals, and the anchor rod holes are blocked by the steel backing plate 9 and the nuts 10.
Example 2
s01: calculating the landslide thrust of the covering layer of the deep covering layer landslide section;
s02: according to the landslide thrust data of the covering layer, respectively arranging front row anti-slide piles 2 and rear row anti-slide piles 3 on the outer side and the inner side of the filled roadbed, wherein the front row anti-slide piles 2 and the rear row anti-slide piles 3 are arranged in a staggered mode according to the direction of a road center line 1, and pile jumping construction is conducted from two sides of a deep covering layer landslide section to the middle part;
s03: binding an anti-slide pile reinforcement cage, hoisting the anti-slide pile reinforcement cage, and pouring concrete, wherein the concrete is not poured within a range of 2m below the pile top of the anti-slide pile;
s04: arranging a longitudinal reinforced concrete joist on the pile top of the slide-resistant pile along the road line in the longitudinal direction, wherein the size of the bottom surface of the longitudinal reinforced concrete joist is matched with that of the top surface of the slide-resistant pile, and the thickness of the longitudinal reinforced concrete joist is 2.0 m;
s05: a transverse connecting beam 6 and an oblique connecting beam 7 are arranged between the two rows of longitudinal reinforced concrete joists, and reinforcing steel bars of the transverse connecting beam 6 and reinforcing steel bars of the oblique connecting beam 7 are bound; the thickness of the transverse connecting beam 6 and the oblique connecting beam 7 is less than that of the longitudinal reinforced concrete joist;
s06: pouring concrete of front-row longitudinal reinforced concrete joists, rear-row longitudinal reinforced concrete joists, transverse connecting beams 6 and oblique connecting beams 7 within 2m of the top of the anti-slide pile;
s07: binding reinforcing steel bars of a foundation widening reinforced concrete thin-wall retaining wall 11 at the tops of the two longitudinal joists, solidifying the foundation widening reinforced concrete retaining wall and the longitudinal joists by adopting connecting reinforcing steel bars, and arranging an anchor rod hole and a drain hole 12 in the foundation widening reinforced concrete thin-wall retaining wall 11;
s08: pouring concrete of the foundation widening type reinforced concrete retaining wall;
s09: filling and rolling the filled roadbed layer by layer, constructing split thread steel bars 8 according to the filling height, respectively penetrating the anchor rod holes at two ends of the split thread steel bars 8, arranging steel backing plates 9 and nuts 10 at the end parts of two sides of the split thread steel bars 8, and fixing the thread steel bars on the foundation widened reinforced concrete retaining wall body through the steel backing plates 9 and the nuts 10;
s10: monitoring the settlement deformation and horizontal displacement of the filling roadbed and road surface 13 at any time;
s11: and adjusting the positions of the nuts 10 at the two ends of the split thread steel bar 8 according to the monitoring results of the settlement deformation and the horizontal displacement of the filling roadbed pavement 13.
The height of the foundation widening type reinforced concrete retaining wall is 2.0m, and the wall thickness is 0.5 m.
When the covering layer is loose or underground water exists, namely potential safety hazards exist in manual hole digging pile construction, mechanical hole drilling piles or mechanical hole digging piles are adopted.
Example 3
The embodiment 2 is a construction method of a supporting and retaining structure of a filling roadbed in a landslide section with a deep covering layer, which comprises the following steps:
s01: calculating the landslide thrust of the covering layer of the deep covering layer landslide section;
s02: according to the landslide thrust data of the covering layer, respectively arranging front row anti-slide piles 2 and rear row anti-slide piles 3 on the outer side and the inner side of the filled roadbed, wherein the front row anti-slide piles 2 and the rear row anti-slide piles 3 are arranged in a staggered mode according to the direction of a road center line 1, and pile jumping construction is conducted from two sides of a deep covering layer landslide section to the middle part;
s03: binding an anti-slide pile reinforcement cage, hoisting the anti-slide pile reinforcement cage, and pouring concrete, wherein the concrete is not poured within the range of 1.0m below the pile top of the anti-slide pile;
s04: arranging a longitudinal reinforced concrete joist on the pile top of the slide-resistant pile along the road line in the longitudinal direction, wherein the size of the bottom surface of the longitudinal reinforced concrete joist is matched with that of the top surface of the slide-resistant pile, and the thickness of the longitudinal reinforced concrete joist is 1.0 m;
s05: a transverse connecting beam 6 and an oblique connecting beam 7 are arranged between the two rows of longitudinal reinforced concrete joists, and reinforcing steel bars of the transverse connecting beam 6 and reinforcing steel bars of the oblique connecting beam 7 are bound; the thickness of the transverse connecting beam 6 and the oblique connecting beam 7 is less than that of the longitudinal reinforced concrete joist;
s06: pouring concrete of front-row longitudinal reinforced concrete joists, rear-row longitudinal reinforced concrete joists, transverse connecting beams 6 and oblique connecting beams 7 within the range of 1.0m at the top of the anti-slide pile;
s07: binding reinforcing steel bars of a foundation widening reinforced concrete thin-wall retaining wall 11 at the tops of the two longitudinal joists, solidifying the foundation widening reinforced concrete retaining wall and the longitudinal joists by adopting connecting reinforcing steel bars, and arranging an anchor rod hole and a drain hole 12 in the foundation widening reinforced concrete thin-wall retaining wall 11;
s08: pouring concrete of the foundation widening type reinforced concrete retaining wall;
s09: filling and rolling the filled roadbed layer by layer, constructing split thread steel bars 8 according to the filling height, respectively penetrating the anchor rod holes at two ends of the split thread steel bars 8, arranging steel backing plates 9 and nuts 10 at the end parts of two sides of the split thread steel bars 8, and fixing the thread steel bars on the foundation widened reinforced concrete retaining wall body through the steel backing plates 9 and the nuts 10;
s10: monitoring the settlement deformation and horizontal displacement of the filling roadbed and road surface 13 at any time;
s11: and adjusting the positions of the nuts 10 at the two ends of the split thread steel bar 8 according to the monitoring results of the settlement deformation and the horizontal displacement of the filling roadbed pavement 13.
The height of the foundation widening type reinforced concrete retaining wall is 1.0m, and the wall thickness is 0.3 m.
When the covering layer is loose or underground water exists, namely potential safety hazards exist in manual hole digging pile construction, mechanical hole drilling piles or mechanical hole digging piles are adopted.
Example 4
The current regulation specification does not have detailed comprehensive utilization methods of double-row anti-slide piles, pile top joists, half-meter-shaped connecting beams between two rows of anti-slide piles, split thread steel bars 8 and reinforced concrete retaining walls.
Relevant research data show that when the front and rear rows of anti-slide piles are arranged in a shape like a Chinese character 'pin', the bending moment, the shearing force and the displacement of the front and rear rows of anti-slide piles are smaller than those of the front and rear rows of anti-slide piles arranged in a parallel mode, so that the pile diameter size and the steel bar consumption of the double rows of anti-slide piles arranged in a shape like a Chinese character 'pin' are smaller than those of the double rows of anti-slide piles in a door type structure, the manufacturing cost of. The front row anti-slide pile 2 pile top longitudinal joist and the rear row anti-slide pile 3 pile top longitudinal joist respectively connect the front row anti-slide pile 2 and the rear row anti-slide pile 3 together, the anti-slide pile top longitudinal joist is stressed together, and the front row anti-slide pile 3 pile top longitudinal joist and the rear row anti-slide pile 3 pile top longitudinal joist form an hyperstatic structure through a transverse connecting beam 6 and an oblique connecting beam 7, compared with the door type structure, the oblique connecting beam 7 is added to the double row anti-slide pile, the horizontal downward sliding force of the deep overburden layer landslide section is transmitted to the rear row anti-slide pile 3 through the front row anti-slide pile 2 pile top longitudinal joist, the transverse connecting beam 6, the oblique connecting beam 7 and the rear row anti-slide pile 3 pile top longitudinal joist, the front row anti-slide pile 2 and the rear row anti-slide pile 3 are ensured to reasonably distribute the horizontal downward sliding force, and the failure of individual anti-slide pile caused by overlarge horizontal shearing force or overlarge bending moment, displacement.
A deep overburden landslide section fill subgrade retaining structure includes landslide section fill subgrade both sides front row slide-resistant pile 2 and back row slide-resistant pile 3 (front row slide-resistant pile 2 and back row slide-resistant pile 3 "article" font interval arrangement), front row slide-resistant pile 2 pile top longitudinal joist and back row slide-resistant pile 3 pile top longitudinal joist, half a meter style of calligraphy tie beam (including horizontal tie beam 6 and slant tie beam 7) between two longitudinal joist, joist top counter-pull thread reinforcing bar 8 and foundation widen type reinforced concrete retaining wall. The anti-slide pile is generally a square pile, and if the covering layer is loose or underground water exists, a round pile is adopted. The front row of anti-slide piles 2 and the rear row of anti-slide piles 3 are arranged at intervals, so that the two rows of piles bear landslide thrust more reasonably, and the bending moment of the single row of anti-slide piles is reduced; meanwhile, the longitudinal joists of the pile tops of the front row of anti-slide piles 2 and the rear row of anti-slide piles 3 and the half-meter-shaped connecting beams (comprising the transverse connecting beams 6 and the oblique connecting beams 7) between the two longitudinal joists enable the two rows of anti-slide piles to form an integral anti-slide and load-bearing structure, and the horizontal displacement of the pile tops is reduced; and the top of the longitudinal joist of the front row of anti-slide piles 2 and the back row of anti-slide piles 3 is provided with the counter-pulling thread steel bars 8 and the foundation widened reinforced concrete retaining wall, so that the length of the cantilever section of the anti-slide pile can be effectively reduced, the length and the size of the anti-slide pile are reduced, and the subgrade settlement and the horizontal displacement are effectively controlled.
Therefore, the supporting and retaining structure has the characteristics of economy, reasonableness, convenience in construction, clear structural stress, effective control of subgrade settlement and horizontal displacement, reduction of engineering cost and the like, ensures the safety of the filling subgrade in the deep landslide section, and provides reference for the design and construction of the filling subgrade in the deep landslide section.
The relevant operation steps for this example 4 are as follows:
1. according to the calculation result of the landslide thrust of the covering layer, front row anti-slide piles 2 and rear row anti-slide piles 3 are respectively arranged on the outer side and the inner side of the roadbed, and the front row anti-slide piles 2 and the rear row anti-slide piles 3 are arranged at intervals in a shape like Chinese character 'pin'. The anti-slide pile generally adopts a square pile, and if a covering layer is loose or underground water exists, namely, a mechanical drilled pile or a mechanical bored pile (round pile) is adopted when potential safety hazards exist in manual bored pile construction. And (3) jumping piles from the two sides of the landslide section to the middle part of the landslide, and reducing disturbance of mechanical excavation on the landslide of the covering layer as much as possible.
2. Binding an anti-slide pile reinforcement cage, hoisting the anti-slide pile reinforcement cage on site by adopting a crane, pouring concrete, and temporarily not pouring the concrete within the range of 1.5m below the pile top.
3. The front row of anti-slide piles 2 are provided with front row of longitudinal reinforced concrete joists on pile tops along the longitudinal direction of a route, the width of each joist is equal to the length or the diameter of each anti-slide pile, and the thickness of each joist is 1.5 m. And the back row of anti-slide piles 3 are longitudinally provided with back row of longitudinal reinforced concrete joists on the pile tops along the route. And binding front row longitudinal joist steel bars and rear row longitudinal joist steel bars on site.
4. And (3) binding the reinforcing steel bars of the transverse connecting beam 6 and the reinforcing steel bars of the oblique connecting beam 7 between the two longitudinal joists on site. The width of the transverse connecting beam 6 and the oblique connecting beam 7 is 0.67m, and the thickness is 0.5 m.
5. And pouring concrete in the range of 1.5m at the top of the anti-slide pile, the front row of longitudinal reinforced concrete joists, the rear row of longitudinal reinforced concrete joists, the transverse connecting beam 6 and the oblique connecting beam 7.
6. And binding reinforcing steel bars of the foundation widening reinforced concrete thin-wall retaining wall 11 at the tops of the two longitudinal joists, solidifying the foundation widening reinforced concrete retaining wall and the longitudinal joists by adopting connecting reinforcing steel bars, and arranging an anchor rod hole and a drain hole 12. And then pouring concrete of the foundation widened retaining wall. The width of the widened reinforced concrete thin-wall retaining wall foundation is 1.5m, and the wall thickness of the retaining wall is 0.4 m.
7. Filling and rolling a filling road layer by layer on site according to design requirements, constructing split thread steel bars 8(HRB400, diameter 32mm) according to filling height, and arranging steel backing plates 9(10cm multiplied by 10cm, thickness 2cm) and nuts 10 at the end parts of the thread steel bars on two sides.
8. According to the monitoring results of the settlement deformation and the horizontal displacement of the filling roadbed pavement 13, the positions of the nuts 10 at the two ends of the split thread reinforcing steel bars 8 are adjusted, and the safety of the filling roadbed at the deep landslide section is ensured.
The rebar of examples 1-4 can be other equally effective rebar.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A supporting and retaining structure for a filling roadbed at a deep covering layer landslide section is characterized by comprising front row anti-slide piles (2) and rear row anti-slide piles (3) which are respectively arranged at two sides of the filling roadbed, the front row of anti-slide piles (2) and the rear row of anti-slide piles (3) penetrate through the covering layer landslide sliding surface (14) and extend out of the ground, the front row of anti-slide piles (2) and the rear row of anti-slide piles (3) are arranged in a staggered manner along the direction of the filling road center line (1), the top of the front row of anti-slide piles (2) is longitudinally provided with a front row of pile top longitudinal joist (4) connected with the front row of anti-slide piles (2), the top of the back row of anti-slide piles (3) is longitudinally provided with a back row of pile top longitudinal joist (5) connected with the back row of anti-slide piles (3), a transverse connecting beam (6) and an oblique connecting beam (7) are arranged between the front row pile top longitudinal joist (4) and the rear row pile top longitudinal joist (5);
the top of the front row of pile top longitudinal supporting beam (4) and the top of the rear row of pile top longitudinal supporting beam (5) are respectively and longitudinally provided with a front row thin-wall retaining wall and a rear row thin-wall retaining wall, the front row thin-wall retaining wall and the rear row thin-wall retaining wall are both basic widened reinforced concrete thin-wall retaining walls (11), opposite-pulling thread reinforcements (8) are arranged between the front row thin-wall retaining wall and the rear row thin-wall retaining wall, and the opposite-pulling thread reinforcements (8) are used for fixing the front row thin-wall retaining wall and the rear row thin-wall retaining wall.
2. The deep overburden landslide section fill subgrade retaining structure as claimed in claim 1, wherein said front row thin-wall retaining wall and said back row thin-wall retaining wall are both provided with a plurality of anchor rod holes, said tie-thread steel bars (8) pass through said anchor rod holes, said tie-thread steel bars (8) pass through the end of said anchor rod holes and are sequentially provided with a steel backing plate (9) and a nut (10), said tie-thread steel bars (8), said steel backing plate (9) and said nut (10) are used for fixing the relative positions of said front row thin-wall retaining wall and said back row thin-wall retaining wall.
3. The deep overburden landslide section fill subgrade retaining structure of claim 1, wherein said front row of anti-slide piles (2) and said rear row of anti-slide piles (3) are arranged in sequence according to a sliding body moving direction.
4. The deep overburden landslide section fill subgrade retaining structure of claim 1, wherein the position of said transverse tie beams (6) and said diagonal tie beams (7) are N-shaped.
5. The deep overburden landslide section fill subgrade retaining structure according to claim 1, wherein said transverse tie beams (6) are located at one end of said longitudinal joist corresponding to the anti-skid piles and at the other end of said longitudinal joist corresponding to the midpoint between two anti-skid piles; one end of the oblique connecting beam (7) is located at the position of the front row pile top longitudinal joist (4) corresponding to the slide-resistant pile, and one end of the oblique connecting beam (7) is located at the position of the rear row pile top longitudinal joist (5) corresponding to the slide-resistant pile.
6. The deep overburden landslide section fill subgrade retaining structure of claim 1, wherein said foundation widening reinforced concrete thin wall retaining wall (11) side wall is provided with a plurality of drainage holes (12) arranged at intervals.
7. The deep overburden landslide section fill subgrade retaining structure of claim 1, wherein said front row of anti-skid piles (2) and said rear row of anti-skid piles (3) are square piles and/or cylindrical.
8. A construction method for a supporting and retaining structure of a filling roadbed in a deep covering layer landslide section is characterized by comprising the following steps:
s01: calculating the landslide thrust of the covering layer of the deep covering layer landslide section;
s02: according to the landslide thrust data of the covering layer, front row anti-slide piles (2) and rear row anti-slide piles (3) are respectively arranged on the outer side and the inner side of the filled roadbed, the front row anti-slide piles (2) and the rear row anti-slide piles (3) are arranged in a staggered mode according to the direction of a road center line (1), and pile jumping construction is conducted from two sides of a deep covering layer landslide section to the middle part;
s03: binding an anti-slide pile reinforcement cage, hoisting the anti-slide pile reinforcement cage, and pouring concrete, wherein the concrete is not poured within the range of 1.5m below the pile top of the anti-slide pile;
s04: arranging a longitudinal reinforced concrete joist on the pile top of the slide-resistant pile along the road line in the longitudinal direction, wherein the size of the bottom surface of the longitudinal reinforced concrete joist is matched with that of the top surface of the slide-resistant pile, and the thickness of the longitudinal reinforced concrete joist is 1.0-2.0 m;
s05: a transverse connecting beam (6) and an oblique connecting beam (7) are arranged between the two rows of longitudinal reinforced concrete joists, and reinforcing steel bars of the transverse connecting beam (6) and reinforcing steel bars of the oblique connecting beam (7) are bound; the thickness of the transverse connecting beam (6) and the oblique connecting beam (7) is lower than that of the longitudinal reinforced concrete joist;
s06: pouring concrete of front-row longitudinal reinforced concrete joists, rear-row longitudinal reinforced concrete joists, transverse connecting beams (6) and oblique connecting beams (7) within the range of 1.5m at the top of the anti-slide pile;
s07: binding reinforcing steel bars of a foundation widened type reinforced concrete thin-wall retaining wall (11) at the tops of the two longitudinal joists, adopting connecting reinforcing steel bars to consolidate the foundation widened type reinforced concrete retaining wall and the longitudinal joists, and arranging an anchor rod hole and a drain hole (12) in the foundation widened type reinforced concrete thin-wall retaining wall (11);
s08: pouring concrete of the foundation widening type reinforced concrete retaining wall;
s09: filling and rolling a filling roadbed layer by layer, constructing split thread reinforcements (8) according to the filling height, respectively penetrating the anchor rod holes at two ends of the split thread reinforcements (8), arranging steel base plates (9) and nuts (10) at the end parts of two sides of the split thread reinforcements (8), and fixing the thread reinforcements on the foundation widened reinforced concrete retaining wall body through the steel base plates (9) and the nuts (10);
s10: monitoring the settlement deformation and horizontal displacement of the filling roadbed pavement (13) at any time;
s11: and adjusting the positions of the nuts (10) at the two ends of the split thread steel bar (8) according to the monitoring results of the settlement deformation and the horizontal displacement of the filling roadbed pavement (13).
9. The method for constructing a supporting and retaining structure of a roadbed at a landslide section with a deep overburden according to claim 8, wherein the foundation widening type reinforced concrete retaining wall has a height of 1.0 to 2.0m and a wall thickness of 0.3 to 0.5 m.
10. The method for constructing the supporting and retaining structure of the filling roadbed in the deep overburden landslide section according to claim 8, wherein when the overburden is loose or underground water exists, namely, safety hazards exist in manual hole digging pile construction, a mechanical drilled pile or a mechanical hole digging pile is adopted.
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