CN111676989A - Expansive soil cutting slope reinforcing structure and construction method - Google Patents

Expansive soil cutting slope reinforcing structure and construction method Download PDF

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Publication number
CN111676989A
CN111676989A CN202010599749.8A CN202010599749A CN111676989A CN 111676989 A CN111676989 A CN 111676989A CN 202010599749 A CN202010599749 A CN 202010599749A CN 111676989 A CN111676989 A CN 111676989A
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CN
China
Prior art keywords
slope
reinforcing
longitudinal
anchor
constructing
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Pending
Application number
CN202010599749.8A
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Chinese (zh)
Inventor
刘培玉
张占荣
罗旭
张军军
刘坡拉
潘永华
李伟
范瑞祥
高威
刘峰
邢海岩
骆斌
刘同安
王伦
杨闯
张翔玮
刘凯锐
王日
李波
吴培培
王亚飞
黄耀成
赵延端
李明延
王飞
王月超
于小龙
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China Railway Siyuan Survey and Design Group Co Ltd
Sinohydro Engineering Bureau 4 Co Ltd
Original Assignee
China Railway Siyuan Survey and Design Group Co Ltd
Sinohydro Engineering Bureau 4 Co Ltd
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Application filed by China Railway Siyuan Survey and Design Group Co Ltd, Sinohydro Engineering Bureau 4 Co Ltd filed Critical China Railway Siyuan Survey and Design Group Co Ltd
Priority to CN202010599749.8A priority Critical patent/CN111676989A/en
Publication of CN111676989A publication Critical patent/CN111676989A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protecting plants
    • A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
    • A01G13/0256—Ground coverings
    • A01G13/0268—Mats or sheets, e.g. nets or fabrics
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00—Cultivation of specific crops or plants not otherwise provided for
    • 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
    • E02D17/202—Securing of slopes or inclines with flexible securing means
    • 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
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • 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
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/02—Arrangement of sewer pipe-lines or pipe-line systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0004—Synthetics
    • E02D2300/0018—Cement used as binder
    • E02D2300/002—Concrete
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0085—Geotextiles
    • E02D2300/0089—Geotextiles non-woven
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/30—Miscellaneous comprising anchoring details

Abstract

The invention discloses an expansive soil cutting slope reinforcing structure which comprises a slope surface scour prevention part arranged on a slope surface of a slope and a plurality of reinforcing longitudinal beams arranged on the slope surface of the slope and transversely distributed, wherein the bottom of each reinforcing longitudinal beam is in a sawtooth shape, the part of each reinforcing longitudinal beam positioned at the top of the slope is connected with a slope top anchor body, a slope top anchor member is anchored in the slope top and connected with the slope top anchor body, and the part of each reinforcing longitudinal beam positioned at a slope foot is connected with a reinforcing longitudinal beam foundation. The invention also discloses a construction method of the expansive soil cutting slope reinforcing structure, the invention adopts a reinforcing and protecting structure combining the slope top anchoring part, the reinforcing longitudinal beam and the reinforcing longitudinal beam foundation, avoids the situation that the slope toe of the conventional expansive soil slope is provided with a retaining wall or an anti-slide pile high-rigidity retaining system, not only ensures the effective stress of the expansive soil slope surface protecting system, but also improves the stability of the expansive soil slope, saves a large amount of retaining engineering concrete, and has reasonable stress and more economic cost.

Description

Expansive soil cutting slope reinforcing structure and construction method
Technical Field
The invention relates to the field of slope engineering, in particular to an expansive soil road cutting slope reinforcement structure and a construction method of the expansive soil road cutting slope reinforcement structure.
Background
The soil mainly comprises montmorillonite and illite which are strong hydrophilic minerals, is special soil with the functions of water absorption expansion, softening, disintegration and water loss shrinkage cracking, and is easy to cause engineering diseases such as slope instability, foundation deformation and the like due to the repeated expansion and shrinkage deformation characteristics; expansive soil is widely distributed in the north, the northeast, the southwest, the China, the south and other places of China, serious harm and a large amount of economic loss are brought in the engineering construction process, slope engineering in the expansive soil area is usually characterized in that excavation is carried out and sliding is carried out and filling is carried out and collapse is carried out, the destructive effect of the expansive soil also has the characteristics of repeatability and long-term property, and people often call the expansive soil slope as engineering cancer. At present, for slope engineering in expansive soil areas, protective measures such as skeleton slope protection, masonry full-spread slope protection and the like are mostly adopted, and because the protection is only built on a slope surface, concrete cracking is easy to occur under the influence of expansion and shrinkage deformation of expansive soil, the long-term stability of the slope protection is influenced, and even instability damage occurs to the slope within the service life period.
The utility model provides a surperficial inoxidizing coating structure of inflation soil side slope is proposed to stratiform inflation soil side slope protective structure (CN 206873464U), sets up three-layer inoxidizing coating structure on the slope engineering surface, and every layer of inoxidizing coating structure comprises protection stone sublayer, stone protection network and inflation soil layer, has a plurality of interfaces between each inoxidizing coating in this patent, has influenced the stability of side slope, is called the key that restricts its engineering application. The utility model provides an inflation dirt road cutting side slope adds muscle formula and trades fills integrated configuration (CN 208293588U) has provided an inflation dirt road cutting side slope and adds muscle formula and trades and fills integrated configuration, divide the side slope to expand to dig two parts from top to bottom and form the side slope step, set up the platform between two parts side slope steps, fill the filler of water permeability A group in the side slope step outside and form slope protection structure, it is domatic to correspond two parts side slope step formation two parts, set up platform and catch water ditch between the domatic two parts, the water permeability A group filler on the top layer can aggravate the surface water infiltration slope body and cause the inflation soil to expand and contract and warp in this patent, the interface slip deformation between A group filler and the inflation soil original soil influences the side slope stability in addition.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an expansive soil cutting slope reinforcing structure and a construction method of the expansive soil cutting slope reinforcing structure, solves the technical problems of easy deformation and damage of the expansive soil cutting slope, high engineering risk and the like,
in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides an inflation dirt cutting side slope reinforced structure, is including setting up the domatic scour prevention portion on the side slope is domatic, still including setting up a plurality of reinforcement longerons that just transverse distribution was domatic on the side slope, and the bottom of each reinforcement longeron is the cockscomb structure, and the part that the reinforcement longeron is located the top of side slope is connected with hillside top anchor, and hillside top anchor assembly anchor is just connected with hillside top anchor body in the hillside top, and the part that the reinforcement longeron is located the toe is connected with reinforcement longeron basis.
The side slope is in multiple stages, the transition part of the top of the side slope at the uppermost stage is transversely provided with a top transverse sealing layer, the transition part of the side slope at the adjacent stage is transversely provided with a side slope platform transverse sealing layer, the slope bottom of the side slope at the lowermost stage is provided with a slope toe transverse sealing layer,
the reinforced longitudinal beams in the same longitudinal direction of the adjacent slope surfaces are connected through a slope anchor body platform,
the slope top anchor body is connected with the reinforcing longitudinal beam on the slope surface of the side slope at the uppermost level, the reinforcing longitudinal beam foundation is connected with the reinforcing longitudinal beam on the slope surface of the side slope at the lowermost level, the anchor in the slope is anchored at the transition part of the side slope at the adjacent level, and the anchor in the slope is connected with the slope anchor body platform.
The slope top transverse sealing layer is connected with each slope top anchor body which corresponds to the slope top in the transverse direction,
the lateral sealing layer of the side slope platform is connected with each lateral corresponding side slope anchor body platform,
the slope toe transverse sealing layer is connected with each transversely corresponding reinforcing longitudinal beam foundation.
The top of the side slope of the uppermost stage as described above is laterally provided with a top gutter,
a side slope platform drainage ditch is transversely arranged on the side slope platform transverse sealing layer,
and a slope bottom drainage ditch is transversely arranged on the side, far away from the side slope, of the slope toe transverse sealing layer.
The bottom of each grade of side slope is provided with a slope body drainage hole.
The drainage holes of the slope body are drainage steel pipes, the pipe walls of the drainage steel pipes are provided with round holes, and the outer ends of the drainage steel pipes extending out of the side slope are wrapped with non-woven fabrics.
The slope surface scour prevention part comprises planting soil paved on the slope surface, green plants planted on the planting soil and a slope surface protective net covering the planting soil and the green plants.
A construction method of an expansive soil cutting slope reinforcing structure comprises the following steps:
step 1, before filling the expansive soil side slope, firstly leveling the field, building a slope bottom drainage ditch,
step 2, filling a side slope, excavating a foundation pit for reinforcing the longitudinal beam foundation after filling a primary side slope, binding reinforcing steel bars, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam, and pouring concrete for reinforcing the longitudinal beam foundation; pouring a transverse sealing layer of the toe of the slope,
step 3, digging a placing groove on the slope surface of the primary side slope, constructing a reinforcing longitudinal beam, after the placing groove is dug, firstly laying a slope surface protective net, burying the edge of the slope surface protective net which is not less than 10cm in the placing groove of the reinforcing longitudinal beam, then binding reinforcing steel bars, reserving connecting reinforcing steel bars of a side slope anchor body platform, pouring concrete for reinforcing the longitudinal beam,
step 4, filling a secondary side slope, constructing anchor parts in the slope, and reserving reinforcing steel bars connected with a side slope anchor body platform; then pouring a slope anchor body platform; constructing a side slope platform transverse sealing layer and a side slope platform drainage ditch between the reinforced longitudinal beams;
constructing a placing groove for placing a reinforcing longitudinal beam on the slope surface of the secondary side slope, constructing the reinforcing longitudinal beam, after the placing groove is excavated, firstly laying a slope surface protective net, burying the edge of the slope surface protective net which is not less than 10cm in the placing groove of the reinforcing longitudinal beam, then binding reinforcing steel bars, reserving connecting reinforcing steel bars of a slope top anchor body, pouring concrete for reinforcing the longitudinal beam,
step 5, constructing a slope top anchoring part, and reserving a steel bar connected with a slope top anchoring body; then pouring a slope top anchor body; constructing a slope top transverse sealing layer between the reinforced longitudinal beams; constructing a drainage ditch at the top of the slope,
step 6, constructing a drainage part of the slope body,
and 7, constructing planting soil on the slope of the expansive soil slope, and constructing green plants, wherein the maintenance period of the green plants is not less than 3 months.
A construction method of an expansive soil cutting slope reinforcing structure comprises the following steps:
step 1, before excavating the expansive soil side slope, firstly leveling the field, building a slope roof drainage ditch,
step 2, side slope excavation is carried out, after the excavation is finished on the first-level side slope, the anchor parts in the slope at the side slope anchor body platform are constructed, reinforcing steel bars connected with the side slope anchor body platform are reserved,
step 3, binding reinforcing steel bars of the slope anchor body platform, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam, and pouring the slope anchor body platform; constructing a side slope platform transverse sealing layer and a side slope platform drainage ditch between the reinforcing longitudinal beams; digging a placing groove on the slope surface of the primary side slope, constructing a reinforcing longitudinal beam, laying a slope surface protective net firstly after the digging of the placing groove is finished, burying the edge of the slope surface protective net which is not less than 10cm in the placing groove of the reinforcing longitudinal beam, binding reinforcing steel bars, reserving connecting reinforcing steel bars of a slope top anchor body, pouring concrete of the reinforcing longitudinal beam,
step 4, constructing a slope top anchoring part, and reserving a steel bar connected with a slope top anchoring body; then pouring a slope top anchor body; constructing a slope top transverse sealing layer between the reinforcing longitudinal beams,
step 5, continuing to perform slope excavation, and constructing a slope toe drainage ditch after the excavation is finished with the second-level slope; then, excavating a foundation pit for reinforcing the longitudinal beam foundation, binding reinforcing steel bars, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam, and pouring concrete for reinforcing the longitudinal beam foundation; pouring a slope toe transverse sealing layer, digging a placing groove on the slope surface of the secondary side slope, constructing a reinforcing longitudinal beam, laying a slope surface protective net after the digging of the placing groove is finished, burying at least 10cm of edge of the slope surface protective net in the placing groove of the reinforcing longitudinal beam, binding reinforcing steel bars, pouring concrete for reinforcing the longitudinal beam,
step 6, constructing a drainage part of the slope body,
and 7, constructing planting soil on the expansive soil slope, and constructing green plants, wherein the green plant maintenance period is not less than 3.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the reinforced protection structure combining the slope top anchoring part, the reinforced longitudinal beam and the reinforced longitudinal beam foundation, avoids the situation that the slope toe of the conventional expansive soil slope is provided with a retaining wall or a high-rigidity retaining system of an anti-slide pile, not only ensures the effective stress of the expansive soil slope surface protection system, but also improves the stability of the expansive soil slope, saves a large amount of retaining engineering concrete, and has reasonable stress and more economic cost.
2. According to the invention, the drainage system and the slope anti-scouring part of the system are arranged in the construction process, so that the stability of the temporary slope is ensured, and after the construction is finished, the drainage system and the green protection system in the slope are arranged, so that the stability of the permanent slope is ensured. From the perspective of the whole life cycle of the expansive soil side slope, the safety and stability of the side slope are comprehensively ensured.
3. In conclusion, the invention has the advantages of low engineering cost, safety, reliability, environmental protection, convenient construction and reliable quality, and is suitable for excavation and filling expansive soil slope engineering of various projects in an expansive land area.
Drawings
FIG. 1 is a schematic structural view of an expansive soil cut slope reinforcement structure (slope elevation);
FIG. 2 is a schematic view of the structure of section A-A in FIG. 1;
FIG. 3 is a schematic view of the cross section B-B in FIG. 1;
FIG. 4 is a schematic view of the structure of section C-C in FIG. 1;
in the figure, the reinforcing portion: 1-reinforcing longitudinal beam, 1-2-slope top anchoring piece, 1-3-slope top anchoring body, 1-4-slope anchoring body platform, 1-6-reinforcing longitudinal beam foundation and 1-7-slope middle anchoring piece.
Surface drainage part: 2-1-slope top drainage ditch, 2-slope bottom drainage ditch, 2-3-slope top transverse sealing layer, 2-4-side slope platform transverse sealing layer, 2-5-side slope platform drainage ditch and 2-6-slope foot transverse sealing layer.
Slope drainage portion: 3-1-drainage hole of slope body.
Slope surface scour prevention part: 4-1-green plants, 4-2-planting soil and 4-3-slope protection nets.
Detailed description of the preferred embodiments
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
An inflation dirt road cutting slope reinforced structure, includes reinforcing portion, earth's surface drainage portion, slope body drainage portion, domatic scour prevention portion.
The reinforcing part can guarantee the slope stability, is influenced by the retaining effect of the reinforcing part on the one hand, and the soil body behind the reinforcing part will not deform and destroy, and is influenced by the soil arch effect on the other hand, the stability of the expansive soil slope body between the transversely adjacent reinforcing longitudinal beams 1-1 can be obviously enhanced, and the slope stability is gradually enhanced along with the reduction of the distance between the transversely adjacent reinforcing longitudinal beams 1-1.
The reinforcing part comprises reinforcing longitudinal beams 1-1, slope top anchoring pieces 1-2, slope top anchoring pieces 1-3, side slope anchoring piece platforms 1-4, reinforcing longitudinal beam foundations 1-6 and slope middle anchoring pieces 1-7.
The reinforcing longitudinal beams 1-1 are longitudinally arranged along the slope surface of the side slope, the transverse distance between the reinforcing longitudinal beams 1-1 can be 3-8 m, and the common distance is 4-5 m.
When the side slope is in multiple stages, for example, when the side slope is in two stages, the form shown in fig. 2 is adopted, namely the side slope sequentially comprises the following steps from the top of the side slope to the bottom of the side slope: 1-2 parts of slope top anchoring pieces, 1-3 parts of slope top anchoring bodies, 1-1 parts of reinforcing longitudinal beams, 1-7 parts of slope middle anchoring pieces, 1-4 parts of slope anchoring body platforms, 2-5 parts of slope platform drainage ditches, 1-1 parts of reinforcing longitudinal beams and 1-6 parts of reinforcing longitudinal beam foundations.
When only one grade of side slope exists, the steps from the top of the slope to the bottom of the slope are as follows in sequence: 1-2 parts of slope top anchoring pieces, 1-3 parts of slope top anchoring bodies, 1-1 parts of reinforcing longitudinal beams and 1-6 parts of reinforcing longitudinal beam foundations; the reinforcing part is arranged on the side slope with other grades, and the like.
The reinforced longitudinal beam 1-1 is a main body part of the reinforced part and has the following functions: firstly, soil mass behind the reinforced longitudinal beams 1-1 is supported and blocked, and secondly, soil mass stability between the reinforced longitudinal beams 1-1 is ensured by soil arch effect. The reinforcing longitudinal beam 1-1 is generally a beam body structure with a rectangular cross section, is longitudinally and horizontally arranged on a slope surface, the width of the reinforcing longitudinal beam 1-1 is generally 0.5-1.0 m, the thickness of the reinforcing longitudinal beam is generally 0.6-1.2 m, and the inclined length is consistent with the length of the slope. The reinforced longitudinal beam 1-1 is of a reinforced concrete structure. As shown in FIG. 2, the bottom surface of the reinforcing longitudinal beam 1-1 generally adopts a saw-toothed structure to ensure that the reinforcing longitudinal beam 1-1 is tightly connected with the bottom expansive soil foundation, and the sliding deformation of the reinforcing longitudinal beam 1-1 along the section between the reinforcing longitudinal beam and the expansive soil foundation is avoided.
The slope top anchoring piece 1-2 is positioned on the slope top of the side slope at the uppermost stage and is connected with the reinforcing longitudinal beam 1-1 through a slope top anchoring body 1-3.
And the slope middle anchor part 1-7 is positioned at the top of the middle-stage side slope and is connected with the reinforcing longitudinal beam 1-1 through a side slope anchor body platform 1-4.
The slope top anchoring piece 1-2 and the slope middle anchoring piece 1-7 mainly play a role in ensuring that the reinforcing longitudinal beam 1-1 keeps safe and stable under the load effects of the sliding force, the expansion and contraction deformation force and the like under the side slope. The slope top anchoring parts 1-2 and the slope middle anchoring parts 1-7 can adopt an anchor rod structure form, and can also adopt anchor cables, miniature piles, tree root piles and other structure forms. The slope top anchoring part 1-2 and the slope middle anchoring part 1-7 are generally required to be provided with 3-4 anchoring bodies, and as shown in figure 2, all the anchoring bodies are generally inserted into the slope radially to ensure that enough anchoring force is provided; the slope top anchoring piece 1-2, the slope middle anchoring piece 1-7 and the steel bars, or steel strands or steel pipes exposed at the upper parts need to be anchored in the slope top anchoring body 1-3 and the side slope anchoring body platform 1-4 and provide tensile stress not less than 10kN, so that anchoring force is provided for the slope top anchoring body 1-3, the side slope anchoring body platform 1-4 and the reinforcing longitudinal beam 1-1, and the safety and stability of the reinforcing part are guaranteed.
The slope top anchor body 1-3 is used for connecting the slope top anchor piece 1-2 with the reinforcing longitudinal beam 1-1 and effectively transmitting the anchoring force provided by the slope top anchor piece 1-2 to the reinforcing longitudinal beam 1-1. The slope top anchor body 1-3 is of a reinforced concrete structure, is generally a beam body structure with a rectangular cross section, is transversely arranged on the slope top, is generally 2-3 m long, and is basically the same as the reinforcing longitudinal beam 1-1 in other structural forms and technical parameters. The stressed steel bars of the slope top anchor body 1-3 are welded with the stressed steel bars of the reinforcing longitudinal beam 1-1, or the same steel bar is adopted.
The slope anchor body platform 1-4 is used for connecting the slope anchoring parts 1-7 and the reinforcing longitudinal beam 1-1 and effectively transmitting the anchoring force provided by the slope anchoring parts 1-7 to the reinforcing longitudinal beam 1-1. The side slope anchor platform 1-4 is made of reinforced concrete structure, generally is a beam structure with rectangular cross section, and is transversely arranged at the joint of adjacent side slopes, and the rest structural forms and technical parameters are basically the same as those of the reinforcing longitudinal beam 1-1. The stressed steel bars of the slope anchor body platform 1-4 are welded with the stressed steel bars of the reinforcing longitudinal beam 1-1, or the same steel bar is adopted.
And the side slope platform drainage ditch 2-5 has the function of ensuring that surface water and rainfall on the slope surface of the superior side slope can be intensively drained out of the side slope range, and avoiding the influence of surface water infiltration on the stability of the expansive soil slope body.
The side slope platform drainage ditch 2-5 is generally of a reinforced concrete structure, and the stressed steel bars are connected with the stressed steel bars of the side slope anchor body platform 1-4 so as to ensure the stability of the side slope platform drainage ditch. The side slope platform drainage ditch 2-5 is generally of a trapezoidal groove structure, is generally cast in situ on a side slope platform transverse sealing layer 2-4 by adopting reinforced concrete, is generally 0.3-0.5 m higher than the side slope platform transverse sealing layer, and is generally required to be provided with a drainage slope not less than 2 per thousand in the transverse direction so as to ensure smooth drainage.
And the reinforcing longitudinal beam foundation 1-6 is arranged at the toe of the slope and can provide support for the reinforcing longitudinal beam 1-1, so that the stability of the whole reinforcing part is ensured. The reinforcing longitudinal beam foundation 1-6 is generally a vertically arranged cuboid reinforced concrete structure, is completely embedded below the ground of a toe, has the width consistent with that of the reinforcing longitudinal beam 1-1, has the thickness of 0.5-0.8 m, and has the height generally larger than the depth of an atmospheric sharp influence zone in an expansive soil area. And for reinforcing the longitudinal beam foundation 1-6, the internal reinforcing steel bars are welded together by using the stressed reinforcing steel bars for reinforcing the longitudinal beam foundation 1-1, or the same reinforcing steel bar is adopted.
And the surface water drainage part is used for draining surface water and rainfall in the expansive soil slope range and intercepting the surface water and the rainfall outside the expansive soil slope range to form a smooth surface water drainage system, so that surface water infiltration is weakened, and the stability of the expansive soil slope is ensured.
The surface drainage part comprises a slope top drainage ditch 2-1, a slope bottom drainage ditch 2-2, a slope top transverse sealing layer 2-3, a side slope platform transverse sealing layer 2-4, a side slope platform drainage ditch 2-5, a slope foot transverse sealing layer 2-6 and the like.
And the slope top drainage ditch 2-1 is used for draining surface water on the slope top and preventing the surface water on the slope top from permeating into the slope to influence the stability of the expansive soil slope body.
And the slope bottom drainage ditch 2-2 is used for draining surface water flowing down from a slope surface and preventing the surface water from gathering near a slope toe to soften the slope toe and influence the stability of the expansive soil slope body.
And the side slope platform drainage ditch 2-5 is used for draining surface water flowing down from a slope surface and preventing the surface water from gathering near a slope toe to soften the slope toe and influence the stability of the expansive soil slope body.
The slope top drainage ditch 2-1, the slope bottom drainage ditch 2-2 and the side slope platform drainage ditch 2-5 can be of a plain concrete structure or a reinforced concrete structure. The drainage slopes of the slope top drainage ditch 2-1, the slope bottom drainage ditch 2-2 and the side slope platform drainage ditch 2-5 are required to be not less than 2 thousandths along the transverse direction so as to ensure smooth drainage in the ditch body.
The slope top transverse sealing layer 2-3 is arranged at the intersection of the slope top ground line and the slope surface line of the slope at the uppermost level, and the slope foot transverse sealing layer 2-6 is arranged between the slope foot of the slope at the lowermost level and the slope bottom drainage ditch 2-2. The side slope platform transverse sealing layer 2-4 is arranged at the transition position of the side slope of the adjacent stage, surface water and rainfall are easy to accumulate and wash at the broken line position of the side slope, and the influence of the surface water and the rainfall on the side slope can be weakened by arranging the slope top transverse sealing layer 2-3, the side slope platform transverse sealing layer 2-4 and the slope foot transverse sealing layer 2-6. The slope top transverse sealing layer 2-3, the side slope platform transverse sealing layer 2-4 and the slope foot transverse sealing layer 2-6 are generally of a plain concrete structure, and can also be of a reinforced concrete structure or a grouted rubble structure.
The slope drainage part is used for draining a small amount of underground water inside the slope body of the side slope and plays a role in draining the side slope, so that the strength of the slope body of the side slope is improved, and the stability of the side slope is ensured.
The slope drainage part can adopt a slope drainage hole 3-1 alone, a supporting infiltration ditch or a blind ditch alone, or a combination of the slope drainage hole 3-1 and the supporting infiltration ditch or the blind ditch.
The slope body drain hole 3-1 generally adopts a drainage steel pipe with the diameter of 10-20 cm, the pipe wall of the drainage steel pipe is provided with round holes with the diameter of 1-2 cm, 3-4 round holes are arranged along the circumferential direction of the pipe wall of the drainage steel pipe, the distance between the round holes along the axial direction of the drainage steel pipe is generally 20-30 cm, and the outer side of the drainage steel pipe is wrapped with 2-3 layers of non-woven fabrics to serve as an inverted filter layer. The water outlet direction of the slope body water outlet hole 3-1 is inclined downwards, the inclination angle is 8-10 degrees, and the length is generally 6-12 m.
And the slope surface scour prevention parts are arranged between the reinforcing longitudinal beams 1-1 and are used for ensuring the stability of the expansive soil slope surface and avoiding the scour erosion of surface water and rainfall.
The slope drainage part is used for draining a small amount of underground water inside the slope body of the side slope and plays a role in draining the side slope, so that the strength of the slope body of the side slope is improved, and the stability of the side slope is ensured.
The slope scour prevention part comprises 4-1 parts of green plants, 4-2 parts of planting soil and 4-3 parts of slope protection nets.
The green plant 4-1 is a permanent anti-scour system. The green plant 4-1 is mainly shrubs with developed root systems suitable for local climatic environments, such as thorns, bicolor lespedeza, amorpha fruticosa, acacia, shazhangwang and the like, and can be used for simultaneously planting grasses with developed root systems suitable for local climatic environments, such as bermuda koenigii, broadleaf grasses, paspalum natatum and the like. The green plant 4-1 is planted quickly after the slope construction is formed, and a green protection system is formed as soon as possible.
And 4-2 parts of planting soil, which is arranged on the slope surface, is generally 10-20 cm thick and can provide nutrients required for the growth of the green plants 4-1. The planting soil 4-2 is rich in organic matters and nutrients required by plants, can be surface soil of a vegetation growing area, and can also be prepared by mixing common cohesive soil, organic fertilizers and the like in a mixing station.
The slope surface protective net 4-3 is a temporary anti-scouring system and is used for anti-scouring of slope surface soil of the slope surface after the expansive soil slope is formed until the green plant 4-1 grows and forms, and is used for stably fixing the planting soil 4-2. The slope surface protective net 4-3 can adopt net-shaped or reticulate-pattern objects such as geogrids, geocells, plant fiber blankets, steel wire meshes and the like, the size of each net is less than 5cm, and the surface of each net has certain roughness. The two sides of the slope protection net 4-3 are not less than 10cm in length and are embedded in the placing grooves of the reinforcing longitudinal beams 1-1, so that the slope protection net 4-3 is fixed with the slope of the expansive soil slope. A certain number of bamboo sticks, short anchor rods and the like are arranged between the slope surface protective net 4-3 and the swelling soil side slope surface to anchor the slope surface protective net 4-3 to the swelling soil side slope surface.
The method comprises the following steps of 1-1 reinforcing longitudinal beam, 1-2 slope top anchoring parts, 1-3 slope top anchoring parts, 1-4 slope anchor body platforms, 2-5 slope platform drainage ditches, 1-6 reinforcing longitudinal beam foundations, 2-3 slope top transverse sealing layers, 2-4 slope platform transverse sealing layers, 2-5 slope platform drainage ditches and 2-6 slope toe transverse sealing layers, wherein expansion joints are arranged at contact positions between the reinforcing longitudinal beam foundations and the slope top transverse sealing layers, the width of the expansion joints is generally 1-2 cm, and the expansion joints are filled and compacted by asphalt reinforcement or acetone plugs.
A construction method of an expansive soil cut slope reinforcement structure is characterized in that for a fill slope, a first-level slope is a lower-level slope of a second-level slope and is located below the second-level slope, and the construction method comprises the following steps:
step 1, before filling the expansive soil side slope, firstly leveling the field, avoiding local water accumulation, and building a slope bottom drainage ditch 2-2.
Step 2, filling the side slope according to design requirements, excavating a foundation pit for reinforcing the longitudinal beam foundation 1-6 after filling the primary side slope, binding reinforcing steel bars, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam foundation 1-1, and pouring concrete for reinforcing the longitudinal beam foundation 1-6; and (5) pouring transverse sealing layers 2-6 of the toe.
And 3, digging a placing groove on the slope surface of the first-level side slope, constructing a reinforcing longitudinal beam 1-1, after the digging is finished, firstly laying a slope surface protective net 4-3, burying the edge of the slope surface protective net 4-3, which is not less than 10cm, in the placing groove of the reinforcing longitudinal beam 1-1, binding reinforcing steel bars, reserving connecting reinforcing steel bars of the side slope anchor platform 1-4, and pouring concrete for reinforcing the longitudinal beam 1-1.
Step 4, filling a secondary side slope according to design requirements, constructing anchor parts 1-7 in the slope, and reserving reinforcing steel bars connected with the side slope anchor body platform 1-4; then pouring a slope anchor body platform 1-4; constructing a lateral slope platform sealing layer 2-4 and a lateral slope platform drainage ditch 2-5 between the reinforcing longitudinal beams 1-1;
the method comprises the steps of constructing a placing groove for placing a reinforcing longitudinal beam 1-1 on the slope surface of a secondary side slope, constructing the reinforcing longitudinal beam 1-1, after the placing groove is excavated, firstly laying a slope surface protective net 4-3, burying the slope surface protective net 4-3 with the edge not less than 10cm in the placing groove of the reinforcing longitudinal beam 1-1, binding reinforcing steel bars, reserving connecting reinforcing steel bars of slope top anchor bodies 1-3, and pouring concrete of the reinforcing longitudinal beam 1-1.
Step 5, constructing a slope top anchoring piece 1-2, and reserving a steel bar connected with a slope top anchoring body 1-3; then pouring 1-3 slope top anchor bodies; constructing and reinforcing a slope top transverse sealing layer 2-3 between the longitudinal beams 1-1; and constructing a slope top drainage ditch 2-1.
And 6, constructing a slope drainage part.
And 7, constructing planting soil 4-2 on the swelling soil slope, constructing green plants 4-1, and maintaining the green plants 4-1 for at least 3 months. The expansive soil cutting slope reinforcing structure under the condition of filling the slope is completed.
A construction method of an expansive soil cut slope reinforcement structure is provided, for an excavation slope, a first-level slope is a higher-level slope of a second-level slope and is positioned above the second-level slope, and the construction method comprises the following steps:
step 1, before excavating the expansive soil side slope, firstly leveling the field, avoiding local water accumulation, and constructing a slope roof drainage ditch 2-1.
And 2, excavating the side slope according to design requirements, constructing the in-slope anchor parts 1-7 at the positions of the side slope anchor body platforms 1-4 after the excavation is finished on the first-level side slope, and reserving reinforcing steel bars connected with the side slope anchor body platforms 1-4.
Step 3, binding reinforcing steel bars of the slope anchor platform 1-4, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam 1-1, and pouring the slope anchor platform 1-4; constructing a lateral slope platform sealing layer 2-4 and a slope platform drainage ditch 2-5 between the reinforcing longitudinal beams 1-1; digging a placing groove on the slope surface of a first-level side slope, constructing a reinforcing longitudinal beam 1-1, after the digging groove is finished, firstly laying a slope surface protective net 4-3, burying the edge of the slope surface protective net 4-3 which is not less than 10cm in the placing groove of the reinforcing longitudinal beam 1-1, then binding reinforcing steel bars, reserving connecting reinforcing steel bars of a slope top anchor body 1-3, and pouring concrete for reinforcing the longitudinal beam 1-1.
Step 4, constructing a slope top anchoring piece 1-2, and reserving a steel bar connected with a slope top anchoring body 1-3; then pouring 1-3 slope top anchor bodies; and constructing a slope top transverse sealing layer 2-3 between the reinforced longitudinal beams 1-1.
Step 5, continuing to perform slope excavation according to design requirements, and constructing a slope toe drainage ditch 2-2 after finishing the second-level slope excavation; then, excavating a foundation pit for reinforcing the longitudinal beam foundation 1-6, binding reinforcing steel bars, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam foundation 1-1, and pouring concrete for reinforcing the longitudinal beam foundation 1-6; and (5) pouring transverse sealing layers 2-6 of the toe. Digging a placing groove on the slope surface of a secondary side slope, constructing a reinforcing longitudinal beam 1-1, after the digging of the placing groove is finished, firstly laying a slope surface protective net 4-3, burying the edge of the slope surface protective net 4-3 which is not less than 10cm in the placing groove of the reinforcing longitudinal beam 1-1, and then binding reinforcing steel bars and pouring concrete for reinforcing the longitudinal beam 1-1.
And 6, constructing a slope drainage part.
And 7, constructing planting soil 4-2 on the swelling soil slope, constructing green plants 4-1, and maintaining the green plants 4-1 for at least 3 months. The expansive soil cutting slope reinforcing structure under the condition of the excavation slope is completed.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (9)

1. The expansive soil cut slope reinforcing structure comprises a slope anti-scouring portion arranged on the slope surface of a slope, and is characterized by further comprising a plurality of reinforcing longitudinal beams (1-1) which are arranged on the slope surface of the slope and transversely distributed, the bottom of each reinforcing longitudinal beam (1-1) is in a sawtooth shape, the part, located at the top of the slope, of each reinforcing longitudinal beam (1-1) is connected with a slope top anchor body (1-3), a slope top anchor member (1-2) is anchored in the slope top and connected with the slope top anchor body (1-3), and the part, located at the slope toe, of each reinforcing longitudinal beam (1-1) is connected with a reinforcing longitudinal beam foundation (1-6).
2. The expansive soil road cutting slope reinforcement structure as claimed in claim 1, wherein the slope is multi-stage, the transition of the top of the uppermost slope is transversely provided with a top transverse sealing layer (2-3), the transition of the adjacent slope is transversely provided with a slope platform transverse sealing layer (2-4), the bottom of the lowermost slope is provided with a toe transverse sealing layer (2-6),
the reinforcing longitudinal beams (1-1) in the same longitudinal direction of the adjacent grade slopes are connected through side slope anchor body platforms (1-4),
the slope top anchor body (1-3) is connected with a reinforcing longitudinal beam (1-1) on the slope surface of the side slope at the uppermost stage, a reinforcing longitudinal beam foundation (1-6) is connected with a reinforcing longitudinal beam (1-1) on the slope surface of the side slope at the lowermost stage, the anchor part (1-7) in the slope is anchored at the transition part of the side slope at the adjacent stage, and the anchor part (1-7) in the slope is connected with the anchor part platform (1-4) of the side slope.
3. The expansive soil trench slope reinforcement structure as claimed in claim 2, wherein the top transverse sealing layer (2-3) is connected with each top anchor body (1-3) in transverse correspondence,
the lateral sealing layers (2-4) of the slope platforms are connected with the lateral corresponding slope anchor body platforms (1-4), and the lateral sealing layers (2-6) of the slope feet are connected with the lateral corresponding reinforcing longitudinal beam foundations (1-6).
4. An expansive soil trench slope reinforcement structure according to claim 3, wherein a slope top drainage ditch (2-1) is transversely arranged at the top of the uppermost stage slope,
a side slope platform drainage ditch (2-5) is transversely arranged on the side slope platform transverse sealing layer (2-4),
the side of the slope foot transverse sealing layer (2-6) far away from the side slope is transversely provided with a slope bottom drainage ditch (2-2).
5. The expansive soil road cutting slope reinforcement structure as claimed in claim 2, wherein the bottom of each level of slope is provided with a slope body drainage hole (3-1).
6. The expansive soil road cutting slope reinforcement structure as claimed in claim 5, wherein the slope body drain hole (3-1) is a drainage steel pipe, the pipe wall of the drainage steel pipe is provided with a circular hole, and the outer end of the drainage steel pipe extending out of the slope is wrapped with non-woven fabrics.
7. An expansive soil trench slope reinforcement structure as claimed in claim 1, wherein the slope surface scour prevention part comprises planting soil (4-2) laid on the slope surface, green plants (4-1) planted on the planting soil, and a slope surface protective net (4-3) covering the planting soil and the green plants (4-1).
8. A construction method of an expansive soil road cutting slope reinforcing structure is characterized by comprising the following steps:
step 1, before filling the expansive soil side slope, firstly leveling the field, building a slope bottom drainage ditch (2-2),
step 2, filling a side slope, excavating a foundation pit of the reinforced longitudinal beam foundation (1-6) after filling a primary side slope, binding reinforcing steel bars, reserving connecting reinforcing steel bars of the reinforced longitudinal beam foundation (1-1), and pouring concrete of the reinforced longitudinal beam foundation (1-6); pouring a transverse sealing layer (2-6) of the toe,
step 3, digging a placing groove on the slope surface of the first-level slope, constructing a reinforcing longitudinal beam (1-1), laying a slope surface protective net (4-3) after the placing groove is dug, burying the edge of the slope surface protective net (4-3) into the placing groove of the reinforcing longitudinal beam (1-1) by not less than 10cm, binding reinforcing steel bars, reserving connecting reinforcing steel bars of a slope anchor platform (1-4), pouring concrete of the reinforcing longitudinal beam (1-1),
step 4, filling a secondary side slope, constructing anchor parts (1-7) in the slope, and reserving reinforcing steel bars connected with a side slope anchor body platform (1-4); then pouring a slope anchor body platform (1-4); constructing lateral slope platform sealing layers (2-4) and lateral slope platform drainage ditches (2-5) between the reinforcing longitudinal beams (1-1);
constructing a placing groove for placing a reinforcing longitudinal beam (1-1) on the slope surface of a secondary side slope, constructing the reinforcing longitudinal beam (1-1), after the placing groove is excavated, firstly laying a slope surface protective net (4-3), burying the edge of the slope surface protective net (4-3) into the placing groove of the reinforcing longitudinal beam (1-1) by not less than 10cm, then binding reinforcing steel bars, reserving connecting reinforcing steel bars of a slope top anchor body (1-3), pouring concrete of the reinforcing longitudinal beam (1-1),
step 5, constructing a slope top anchoring piece (1-2), and reserving a steel bar connected with a slope top anchoring body (1-3); then pouring a slope top anchor body (1-3); constructing and reinforcing a slope top transverse sealing layer (2-3) between the longitudinal beams (1-1); constructing a slope roof drainage ditch (2-1),
step 6, constructing a drainage part of the slope body,
and 7, constructing planting soil (4-2) on the slope surface of the expansive soil slope, and constructing green plants (4-1), wherein the maintenance period of the green plants (4-1) is not less than 3 months.
9. A construction method of an expansive soil road cutting slope reinforcing structure is characterized by comprising the following steps:
step 1, before excavating the expansive soil side slope, firstly leveling the field, building a slope roof drainage ditch (2-1),
step 2, side slope excavation is carried out, after the excavation is finished on the first-level side slope, the anchor parts (1-7) in the slope at the positions of the side slope anchor body platforms (1-4) are constructed, reinforcing steel bars connected with the side slope anchor body platforms (1-4) are reserved,
step 3, binding reinforcing steel bars of the slope anchor body platform (1-4), reserving connecting reinforcing steel bars for reinforcing the longitudinal beam (1-1), and pouring the slope anchor body platform (1-4); constructing a lateral slope platform sealing layer (2-4) and a slope platform drainage ditch (2-5) between the reinforcing longitudinal beams (1-1); digging a placing groove on the slope surface of a first-level slope, constructing a reinforcing longitudinal beam (1-1), after the digging of the placing groove is finished, firstly laying a slope surface protective net (4-3), burying the edge of the slope surface protective net (4-3) which is not less than 10cm in the placing groove of the reinforcing longitudinal beam (1-1), then binding reinforcing steel bars, reserving connecting reinforcing steel bars of a slope top anchor body (1-3), pouring concrete of the reinforcing longitudinal beam (1-1),
step 4, constructing a slope top anchoring part (1-2), and reserving a steel bar connected with a slope top anchoring body (1-3); then pouring a slope top anchor body (1-3); constructing a slope top transverse sealing layer (2-3) between the reinforcing longitudinal beams (1-1),
step 5, continuing to excavate the side slope, and constructing a toe drainage ditch (2-2) after the excavation is finished with the second-level side slope; then, excavating a foundation pit for reinforcing the longitudinal beam foundation (1-6), binding reinforcing steel bars, reserving connecting reinforcing steel bars for reinforcing the longitudinal beam foundation (1-1), and pouring concrete for reinforcing the longitudinal beam foundation (1-6); pouring a slope toe transverse sealing layer (2-6), digging a placing groove on the slope surface of the secondary side slope, constructing a reinforcing longitudinal beam (1-1), after the placing groove is dug, firstly laying a slope surface protective net (4-3), burying the edge of the slope surface protective net (4-3) into the placing groove of the reinforcing longitudinal beam (1-1) by no less than 10cm, then binding reinforcing steel bars, pouring concrete of the reinforcing longitudinal beam (1-1),
step 6, constructing a drainage part of the slope body,
and 7, constructing planting soil (4-2) on the swelling soil slope surface, and constructing green plants (4-1), wherein the maintenance period of the green plants (4-1) is not less than 3.
CN202010599749.8A 2020-06-28 2020-06-28 Expansive soil cutting slope reinforcing structure and construction method Pending CN111676989A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112681348A (en) * 2020-12-28 2021-04-20 中水北方勘测设计研究有限责任公司 Slope treatment method
CN113073680A (en) * 2021-04-25 2021-07-06 中铁二院工程集团有限责任公司 Slag disposal site retaining wall structure of plateau high-cold area and construction method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112681348A (en) * 2020-12-28 2021-04-20 中水北方勘测设计研究有限责任公司 Slope treatment method
CN113073680A (en) * 2021-04-25 2021-07-06 中铁二院工程集团有限责任公司 Slag disposal site retaining wall structure of plateau high-cold area and construction method thereof

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