Soft foundation levee slope reinforcing structure based on timber piles and geogrids

Abstract

The utility model provides a soft foundation levee slope reinforcing structure based on timber piles and geogrids. The soft foundation levee slope reinforcing structure comprises a soil levee body, a reinforcing levee slope, a soft soil levee foundation, the timber piles, a gravel soil backfilling layer, a ballast platform and the geogrids. An embankment top road is arranged at the upper part of the earth embankment body, and the side surface is an original embankment slope; the reinforced levee slope is located outside the original levee slope; the soft soil embankment foundation is located on the lower side of the soil embankment body. The lower ends of the timber piles are vertically inserted into the soft soil embankment foundation, and steel wire meshes are arranged at the tops; the gravel soil backfill layer is laid on the timber piles; the ballast platform is located on the upper side of the original levee slope and connected with the reinforced levee slope. The geogrids are located between the gravel soil backfill layer and the ballast platform and laid layer by layer along with filling of the ballast platform. The timber piles are used as the slide-resistant piles, so that the bearing capacity of the soft soil embankment foundation is improved; the stability and integrity of the levee slope are enhanced by adopting the ballast platform and the geogrid, the instability of the levee slope is prevented, the safety of the levee slope in the construction period and the operation period is guaranteed, and the engineering effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy embankment engineering, and more specifically, relates to a soft foundation embankment slope reinforcement structure based on wooden piles and geogrids. Background Art

[0002] The soft foundation of the embankment generally refers to the silty soft soil below the embankment, which generally has the characteristics of high natural water content, large porosity, high compressibility, poor strength and bearing capacity, etc., which poses a great threat to the anti-sliding stability of the embankment slope. Especially during the construction of old embankments, overweight or high-frequency vibration machinery often causes soft soil disturbance when constructing on silty soft soil, reducing its strength, which can easily lead to landslides and collapses of the embankment slopes.

[0003] In the reinforcement of old embankments, in order to prevent the soft foundation slope from becoming unstable, methods such as ballast platforms, mixing piles, anti-slip piles, and plastic drainage boards combined with controlled filling rate are generally used. The ballast platform method may increase a lot of earthwork; the mixing pile method can effectively improve the strength of the embankment foundation, but the construction time is long and the cost is high; concrete or prefabricated anti-slip piles have good effects, but the cost is high; wooden piles are low in cost and fast in construction, but they are not as strong as concrete or prefabricated piles; plastic drainage boards are fast in construction, but are prone to clogging, and the filling rate needs to be controlled, which prolongs the construction period.

[0004] The existing methods have their own advantages, but also have many limitations. Due to multiple restrictions such as treatment effect, project investment, and construction period, especially during flood prevention and rescue, a single soft foundation slope reinforcement measure is difficult to meet the requirements. Utility Model Content

[0005] The utility model aims to provide a soft foundation embankment slope reinforcement structure based on wooden piles and geogrids, which can improve the bearing capacity of the soft foundation and the integrity of the embankment fill, prevent the embankment slope from becoming unstable, and has the advantages of short construction period and low engineering cost.

[0006] To achieve the above-mentioned purpose, the utility model provides a soft foundation embankment slope reinforcement structure based on wood piles and geogrids, including an earth embankment body, a reinforced embankment slope, a soft soil embankment foundation, wood piles, a sand and gravel backfill layer, a ballast platform, and a geogrid;

[0007] The upper part of the earth embankment is provided with a embankment top road, and the side is the original embankment slope;

[0008] The reinforced embankment slope is located outside the original embankment slope;

[0009] The soft soil embankment foundation is located at the lower side of the embankment body;

[0010] The lower end of the wooden pile is vertically inserted into the soft soil embankment foundation, and a steel wire mesh is provided on the top;

[0011] The sand and gravel backfill layer is laid on the wooden piles;

[0012] The ballast platform is located on the upper side of the original embankment slope and is connected to the reinforced embankment slope;

[0013] The geogrid is located between the sand and gravel backfill layer and the ballast platform, and is laid layer by layer as the ballast platform is filled.

[0014] Furthermore, the slope ratio of the reinforced embankment slope is not steeper than 1:2.5.

[0015] Furthermore, the ballast platform is any one of a precast concrete block slope protection, an ecological concrete slope protection or a turf slope protection.

[0016] Furthermore, the reinforced embankment slope is any one of a precast concrete block slope protection, an ecological concrete slope protection or a turf slope protection.

[0017] Furthermore, the thickness of the sand and gravel soil backfill layer is 20 to 30 cm.

[0018] Furthermore, the elevation of the top of the wooden pile changes with the height of the original embankment slope from the slope foot to the original embankment slope.

[0019] Furthermore, the wooden piles are arranged in a plum blossom shape, and the wooden piles are provided in no less than three rows.

[0020] Furthermore, the spacing between the wooden piles near the slope foot is smaller than the spacing between the wooden piles near the original embankment slope.

[0021] Furthermore, the diameter of the wooden pile is not less than 14 centimeters and the length of the pile is not less than four meters.

[0022] Furthermore, the width of the ballast platform is not less than two meters, the slope ratio below the ballast platform is not steeper than the slope ratio of the reinforced embankment slope, and the slope ratio below the ballast platform is not steeper than 1:2.5.

[0023] Furthermore, the geogrid is provided with multiple layers, and the multiple layers of the geogrid are overlapped with the original embankment slope in a step-like manner.

[0024] Compared with the prior art, the utility model has the following technical effects:

[0025] The utility model discloses a soft foundation embankment slope reinforcement structure based on wooden piles and geogrids, which adopts wooden piles as anti-slip piles, plays an anti-slip, side-limiting and load-bearing role, and improves the bearing capacity of the soft soil embankment foundation; adopts a ballast platform and geogrids to enhance the stability and integrity of the embankment slope, prevents the embankment slope from becoming unstable, ensures the safety of the embankment slope during the construction period and the operation period, and has a good engineering effect.

[0026] In addition, the structure adopted by the utility model is convenient to obtain materials, has low engineering cost, simple construction process and short construction period, achieving the multi-faceted effects of structural safety, economical cost and short construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 A schematic structural diagram of a soft foundation slope reinforcement structure based on wooden piles and geogrids provided in an embodiment of the utility model.

[0029] Among them, the reference numerals in the figure are:

[0030] 1-road on top of embankment, 2-embankment body, 3-original embankment slope, 4-reinforced embankment slope, 5-soft soil embankment foundation, 6-ballast platform, 7-wooden piles, 8-wire mesh, 9-sand and gravel backfill layer, 10-geogrid DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0033] See also Figure 1 Now, a soft foundation embankment slope reinforcement structure based on wooden piles and geogrids provided in an embodiment of the utility model is described.

[0034] In one embodiment, a soft foundation embankment slope reinforcement structure based on wood piles and geogrids in an embodiment of the utility model comprises: an earth embankment body 2, a reinforced embankment slope 4, a soft soil embankment foundation 5, wood piles 7, a gravel backfill layer 9, a ballast platform 6 and a geogrid 10. A embankment top road 1 is provided on the upper part of the earth embankment body 2, and the side is the original embankment slope 3; the reinforced embankment slope 4 is located on the outer side of the original embankment slope 2; the soft soil embankment foundation 5 is located on the lower side of the earth embankment body 2; a plurality of wood piles 7 form a wood pile array, and the lower end of each wood pile 7 is vertically inserted in the soft soil embankment foundation 5, and a steel wire mesh 8 is provided on the top; the gravel backfill layer 9 is laid on the wood piles 7; the ballast platform 6 is located on the upper side of the original embankment slope 2 and connected to the reinforced embankment slope 4; the geogrid 10 is located between the gravel backfill layer 9 and the ballast platform 6, and is laid layer by layer as the ballast platform 6 is filled.

[0035] In this embodiment, the trapezoidal section formed by the embankment top road 1, the earth embankment body 2, the original embankment slope 3 and the reinforced embankment slope 4 is the basic structure of the embankment reinforcement. The ballast platform 6, the wooden piles 7, the wire mesh 8, the gravel soil backfill layer 9 and the geogrid 10 constitute the soft foundation embankment slope reinforcement structure, which can be used on the water-facing side of the embankment body or on the backwater side of the embankment body. The soft soil embankment foundation 5 is generally silty soft soil, which has the characteristics of high natural water content, large porosity, high compressibility and low shear strength. The wooden piles 7 can be made of pine wood with strong bearing capacity. The wire mesh 8 can be formed by steel wires intertwined at the upper ends of the wooden piles 7 and connected to the pile tops of the wooden piles 7, so that the array composed of the wooden piles 7 has better integrity and forms a composite force-bearing structure.

[0036] A soft foundation embankment slope reinforcement structure based on wooden piles and geogrids in an embodiment of the utility model adopts wooden piles 7 as anti-slip piles, which play an anti-slip, side limit and load-bearing role, and improves the bearing capacity of the soft soil embankment foundation 5; the ballast platform 6 and the geogrid 10 are adopted to enhance the stability and integrity of the embankment slope, prevent the embankment slope from becoming unstable, ensure the safety of the embankment slope during the construction period and the operation period, and achieve good engineering effect.

[0037] In addition, the structure adopted in the embodiment of the utility model is convenient to obtain materials, has low engineering cost, simple construction process and short construction period, achieving the multi-faceted effects of structural safety, economical cost and short construction period.

[0038] Furthermore, the slope ratio of the reinforced embankment slope 4 of this embodiment is not steeper than 1:2.5 to prevent the embankment slope from sliding or collapsing.

[0039] Further, when the reinforced embankment slope 4 and the ballast platform 6 are located on the water-facing side of the embankment, the reinforced embankment slope 4 and the ballast platform 6 can be any one of prefabricated concrete block slope protection, ecological concrete slope protection or turf slope protection. When the reinforced embankment slope 4 and the ballast platform 6 are located on the water-retaining side of the embankment, the reinforced embankment slope 4 and the ballast platform 6 can be turf slope protection.

[0040] Furthermore, the wood piles 7 of this embodiment are located in the soft soil embankment foundation 5, and are arranged in a plum blossom shape, constituting a part of the embankment foundation. Specifically, the slope foot position is determined according to the cross section of the designed ballast platform 6, and the wood piles 7 are inserted in the soft soil embankment foundation 5 from the slope foot to the embankment body, and are arranged in a plum blossom shape. The elevation of the pile top can change from the slope foot to the original embankment slope 3 in the direction of the original embankment slope 3, so as to avoid the slope instability caused by digging the slope foot as much as possible.

[0041] Furthermore, in the present embodiment, the wooden piles 7 are arranged in no less than 3 rows, the diameter of the wooden piles 7 is not less than 14 centimeters, the pile length is not less than four meters, and the spacing between the wooden piles 7 near the toe of the slope is smaller than the spacing between the wooden piles 7 near the original embankment slope 3, that is, the spacing between the wooden piles 7 near the toe of the slope is denser than the wooden piles 7 near the embankment body, so as to achieve a better reinforcement effect.

[0042] Furthermore, the gravel backfill layer 9 of this embodiment is located on the top of the wooden pile 7 and serves as a cushion layer. The backfill range is 0.5 meters outward from the top of the pile, the sand content is about 30%, and the thickness is generally 20 to 30 cm. The gravel backfill layer 9 is beneficial to foundation drainage and can also improve the integrity of the wooden pile 7 array.

[0043] Furthermore, the width of the ballast platform 6 of this embodiment is not less than two meters, the slope ratio below the ballast platform 6 is not steeper than the slope ratio of the reinforced embankment slope 4, and the slope ratio below the ballast platform 6 is not steeper than 1:2.5 to prevent landslide or collapse of the embankment slope.

[0044] Furthermore, the geogrid of this embodiment is provided with multiple layers, and the multiple layers of geogrids are overlapped with the original embankment slope 3 in a step-like manner. The geogrid 10 is located between the ballast platform 6 and the gravel backfill layer 9. When the embankment is reinforced, the original embankment slope 3 is excavated into a step-like shape, and the multiple layers of geogrids are placed on the excavated steps. They are laid layer by layer according to a certain thickness as the embankment is filled, which can improve the strength of the fill and reduce uneven settlement. The step-like overlap at the connection can strengthen the combination between the old embankment and the new embankment soil, so that the reinforcement effect of the soft foundation embankment slope reinforcement structure is better.

[0045] The overall construction sequence of a soft foundation embankment slope reinforcement structure based on wooden piles and geogrids in an embodiment of the utility model is from bottom to top. First, an array of wooden piles 7 is inserted into the soft soil embankment foundation 5; then, a steel wire mesh 8 is formed by winding and connecting the upper ends of the wooden piles 7, and a sand and gravel backfill layer 9 is laid on the top of the piles; finally, according to the designed section of the ballast platform 6, the embankment body soil is filled layer by layer and the geogrid 10 is laid until the designed elevation and width of the ballast platform 6 are reached.

[0046] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A soft foundation slope reinforcement structure based on wood piles and geogrids, characterized in that: Including earth embankment, reinforced embankment slope, soft soil embankment foundation, wooden piles, gravel backfill layer, ballast platform, geogrid; The upper part of the earth embankment is provided with a embankment top road, and the side is the original embankment slope; The reinforced embankment slope is located outside the original embankment slope; The soft soil embankment foundation is located at the lower side of the embankment body; The lower end of the wooden pile is vertically inserted into the soft soil embankment foundation, and a steel wire mesh is provided on the top; The sand and gravel backfill layer is laid on the wooden piles; The ballast platform is located on the upper side of the original embankment slope and is connected to the reinforced embankment slope; The geogrid is located between the sand and gravel backfill layer and the ballast platform, and is laid layer by layer as the ballast platform is filled.

2. A soft foundation slope reinforcement structure based on wood piles and geogrids as claimed in claim 1, characterized in that: The slope ratio of the reinforced embankment slope is not steeper than 1:2.

5.

3. The soft foundation slope reinforcement structure based on wood piles and geogrids according to claim 1, characterized in that: The ballast platform is any one of a precast concrete block slope protection, an ecological concrete slope protection or a turf slope protection; and / or the reinforced embankment slope is any one of a precast concrete block slope protection, an ecological concrete slope protection or a turf slope protection.

4. The soft foundation slope reinforcement structure based on wood piles and geogrids according to claim 1, characterized in that: The thickness of the sand and gravel soil backfill layer is 20 to 30 cm.

5. The soft foundation slope reinforcement structure based on wood piles and geogrids according to claim 1, characterized in that: The elevation of the top of the wooden pile changes with the height of the original embankment slope from the slope foot to the original embankment slope.

6. A soft foundation slope reinforcement structure based on wood piles and geogrids as claimed in claim 5, characterized in that: The wooden piles are arranged in a plum blossom shape, and the wooden piles are arranged in no less than three rows.

7. A soft foundation slope reinforcement structure based on wood piles and geogrids as claimed in claim 6, characterized in that: The spacing between the wood piles near the slope foot is smaller than the spacing between the wood piles near the original embankment slope.

8. The soft foundation embankment slope reinforcement structure based on wood piles and geogrids as claimed in claim 7, characterized in that: The diameter of the wooden stakes shall not be less than 14 centimeters and the length shall not be less than four meters.

9. The soft foundation slope reinforcement structure based on wood piles and geogrids according to claim 1, characterized in that: The width of the ballast platform is not less than two meters, the slope ratio below the ballast platform is not steeper than the slope ratio of the reinforced embankment slope, and the slope ratio below the ballast platform is not steeper than 1:2.

5.

10. A soft foundation slope reinforcement structure based on wood piles and geogrids as claimed in any one of claims 1 to 9, characterized in that: The geogrid is provided with multiple layers, and the multiple layers of geogrid are overlapped with the original embankment slope in a step-like manner.

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