Energy-saving type filling roadbed drainage structure and construction method

Abstract

The application discloses an energy-saving type filling roadbed drainage structure and a construction method, which comprises a plurality of layers of roadbed fillings and a plurality of layers of geogrids which are alternately laid to form a roadbed, until the filling roadbed filling reaches the designed roadbed elevation, and the transverse two end points of each layer of geogrids are respectively provided with strip fixed plates, the top surface of the topmost roadbed filling is horizontally arranged, and a base layer and a pavement are laid on the top surface, and a drainage pipe is embedded in the second layer of roadbed filling and used for draining the infiltrated water into a left ditch or a right ditch at the bottom of a roadbed slope; therefore, the geogrid structure with low price and superior performance is arranged to strengthen the integrity of the roadbed filling, especially the geogrid is a concave quadratic parabola type, can play a tensile performance, reduce uneven settlement and avoid damage of the drainage pipe, and has the advantages of simple structure, convenient construction, low cost, safety and reliability, and the application has higher economic benefits, energy-saving and environmental protection benefits and social benefits in combination with the corresponding construction method.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of energy-saving road construction field, specifically refers to a kind of energy-saving fill roadbed drainage structure and construction method. BACKGROUND

[0002] Roadbed is the basis of track or pavement, and is a geotechnical structure formed by excavation or filling, which plays an important role in engineering quantity, land area and investment. The main role of roadbed is to provide necessary conditions for pavement laying and vehicle operation, and to bear the static load and dynamic load of pavement and traffic load, while transmitting and diffusing the load to the deep foundation. Fill roadbed is a form of roadbed, and the post-construction settlement of roadbed is generally larger in the center than in the edge, and the influence of environment, especially precipitation, makes the settlement in the center more prominent. In order to improve the bearing capacity of embankment and reduce uneven settlement, in addition to strengthening the treatment of roadbed foundation, geogrid is commonly used to strengthen roadbed structure and transversely set drainage pipes in roadbed to discharge seepage water. The common geogrid is laid horizontally and linearly along the same roadbed elevation, and theoretical analysis and actual engineering test results show that the tensile performance and vertical support of geogrid are not fully utilized, which is not strong in overcoming the characteristics of fill roadbed post-construction settlement, i.e. the settlement in the center is larger than in the edge. At the same time, the transversely set drainage pipes in roadbed lose drainage function or break due to uneven settlement, so it is necessary to improve the laying method of geogrid and drainage structure, reduce or avoid the influence of uneven settlement of roadbed on drainage structure, improve durability, save engineering investment and maintenance cost. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of the prior art and provide an energy-saving fill roadbed drainage structure and construction method which is simple in structure, convenient in construction, low in cost, safe and reliable.

[0004] The technical problem of the present application is solved by the following technical scheme:

[0005] The utility model relates to an energy-saving type filling roadbed drainage structure, characterized in that the filling roadbed drainage structure is with the lowest point of the foundation bottom center of the filling roadbed trapezoidal cross section, and the filling roadbed filler is filled in layers in the shape of the quadratic concave parabola to the roadbed two side edges, the first layer roadbed filler at the bottom is laid along the roadbed longitudinal direction after compaction, and then the second layer roadbed filler is filled on the first layer geogrid, and the filling shape of the second layer roadbed filler after compaction is also the quadratic concave parabola, the second layer geogrid is laid along the roadbed longitudinal direction on the second layer roadbed filler, and the filling roadbed filler and the geogrid are alternately laid in layers, and the filling roadbed filler reaches the designed roadbed elevation, the horizontal distance of the two end points of each layer geogrid is provided with the strip fixed plate, the top surface of the last layer roadbed filler is horizontally arranged, and the base layer and the pavement are laid on the last layer roadbed, the second layer roadbed filler is embedded with the drainage pipe, and the infiltration water in the pavement, the base layer and the roadbed is drained into the left ditch or the right ditch at the roadbed slope bottom through the drainage pipe, the geogrid is taken as the calculation layer with the layer geogrid embedded above the drainage pipe, the pavement top width is B, the horizontal distance between the two side slopes and the two end fixed plates is C1 and C2 respectively, the length between the two end fixed plates of the layer geogrid is C1+B+C2, the vertical uniform load intensity of the base layer and the pavement, the roadbed filler and the vehicle load in the B width is B l , the vertical load intensity of the two end fixed plates O and A to the roadbed top edge is linearly distributed l= , , , the friction coefficient between the geogrid and the roadbed filler is , and the counterforce of the geogrid is .

[0006] The symbols in the formula are defined as follows:

[0007] B, C1 and C2 are the width of the base layer and the pavement top, the distance from the left side road shoulder edge to the left side fixed plate of the calculation layer geogrid, and the distance from the right side road shoulder edge to the right side fixed plate of the calculation layer geogrid respectively, .

[0008] The parabola equation after the maximum differential settlement of the calculation layer linear geogrid , and the horizontal coordinate with the midpoint of the connecting line of the two end fixed plates of the calculation layer geogrid as the coordinate origin, .

[0009] The linear parameters of the parabola after the maximum differential settlement of the linear geogrid at the roadbed edge and the center, .​ ;

[0010] the horizontal length of the vertical midline of the fixed plate at the two ends of the layer of geogrid, ;

[0011] the strength of the roadbed and pavement filler and vehicle load on the layer of geogrid per unit longitudinal length of the roadbed, the strength of the roadbed and pavement filler and vehicle load on the layer of geogrid per unit longitudinal length of the roadbed, the strength of the roadbed and pavement filler and vehicle load on the layer of geogrid per unit longitudinal length of the roadbed, , ;

[0012] the coefficient of ground reaction, dimensionless, ;

[0013] the ratio of the total vertical component of frictional resistance of the linear and parabolic arrangements of geogrid, dimensionless.

[0014] The geogrid is a two-way steel-plastic geogrid, and is arranged in a concave shape. The geogrid is lengthened by ultrasonic welding or lapping, and the lapping length is not less than 50 cm. The height of the multiple layers of geogrids in the roadbed filler is 50-100 cm, and the number of layers is determined according to the height of the roadbed.

[0015] The fixed plate is a plastic sheet with a cross-section of (20-30) cm x (100-200) cm and a thickness of 1-2 cm. The length of the fixed plate extends along the longitudinal direction of the roadbed. The two ends of each layer of geogrid are welded to one side of each fixed plate, and the welding angle between each layer of geogrid and each fixed plate is a right angle.

[0016] The drainage pipe is a transverse drainage pipe embedded in the roadbed, which drains the infiltrated water in the roadbed into the left or right ditch at the bottom of the road slope. The drainage pipe is a soft permeable pipe.

[0017] The infiltrated water is the infiltrated water of natural precipitation into the pavement, base and roadbed, and the infiltrated water forms a wetting curve in the roadbed.

[0018] The wetting curve is a distribution curve of the saturated water surface formed by the natural precipitation through the pavement and base into the roadbed along the cross-section of the roadbed. The intersection point of the wetting curve and the left slope to the height of the ditch bottom of the left ditch forms the left water level, and the intersection point of the wetting curve and the right slope to the height of the ditch bottom of the right ditch forms the right water level.

[0019] A construction method of an energy-saving embankment roadbed drainage structure, comprising the following steps:

[0020] Step one, selecting raw materials

[0021] 1. According to the design drawings, initially determine the type, specification and main technical indicators of the geogrid and drainage pipe raw materials, and detect the technical indicators of the roadbed filler, base and pavement, including water permeability and drainage;

[0022] 2. According to the height of the roadbed filler, the thickness of the base and pavement, the vehicle load, the concave amount of the secondary parabola of each layer of geogrid , estimate the differential settlement amount and the diameter of the drainage pipe, and calculate and check the stress of each layer of geogrid and the diameter of the drainage pipe by formula, and determine the welding process of the geogrid and the fixing plate;

[0023] 3. Sample the geogrid and the fixing plate, and perform welding test detection. The welding of the geogrid and the fixing plate meets the stress requirement;

[0024] Step two, processing the foundation

[0025] 1. Measure and lay out, and process the foundation base according to the design requirements;

[0026] 2. Test and detect the processed foundation base, which meets the design requirements;

[0027] Step three, burying the drainage pipe and laying the geogrid and filling layer by layer

[0028] 1. Fill the first layer of roadbed filler on the foundation, compact it with a road roller, remove the sharp-edged stones in the roadbed filler, lay the drainage pipe, and the cross slope of the drainage pipe meets the design requirements;

[0029] 2. Fill the roadbed filler, and trim the concave amount of the secondary parabola and the curve shape to meet the design requirements;

[0030] 3. Lay the first layer of geogrid, and pull the geogrid tight and flat;

[0031] 4. Weld the two ends of the tight geogrid to the fixing plate;

[0032] 5. Embed the fixing plate with a half height on both sides of the roadbed filler, and the embedding angle of the fixing plate meets the design requirements;

[0033] 6. Fill the second layer of roadbed filler on the top surface of the first layer of geogrid, compact it with a road roller without touching the geogrid and the fixing plate, and set the concave amount of the parabola and the curve according to the calculated value of the second layer of geogrid;

[0034] 7. In this way, until the completion of all layers of geogrid and embankment fill;

[0035] Step three, base and pavement construction

[0036] 1. Construction of base and pavement according to design requirements:

[0037] 2. The quality meets the design requirements.

[0038] Compared with the prior art, the present application mainly provides an energy-saving embankment drainage structure, which is characterized in that the low-cost and superior-performance geogrid structure is arranged to strengthen the integrity of the embankment fill, reduce uneven settlement, and avoid damage to the drainage pipe. The present application has the following advantages: 1. The concave parabolic geogrid is laid in the embankment fill, which can play the tensile performance of the geogrid, effectively overcome the differential settlement of the pavement, base and embankment fill, and make the drainage pipe normally play the drainage function; 2. The concave amount of the concave parabolic geogrid is generally 3% to 5% of the width of the base and pavement, which has little influence on the embankment construction, but the use effect is very significant; 3. The provided design calculation method is clear in principle, scientific and reasonable, practical and easy to implement, which can guide the design and construction of the embankment structure to reduce uneven settlement, improve the strength and stability of the embankment, save the maintenance cost of the differential settlement of the embankment after construction, and improve the safety and quality performance. Therefore, the present application is an energy-saving embankment drainage structure which is simple in structure, convenient in construction, low in cost, safe and reliable, and has high economic, energy-saving and environmental protection, and social benefits in combination with the corresponding construction method. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a structural elevation schematic view of the present application.

[0040] Figure 2 It is a stress analysis diagram of the geogrid. DETAILED DESCRIPTION

[0041] The embodiment of the present application will be described in detail below according to the above drawings.

[0042] As shown in Figure 1 , Figure 2 , 1. foundation, 2. embankment, 21. slope, 3. base, 4. pavement, 51. left ditch, 52. right ditch, 53. left water level, 54. right water level, 6. drainage pipe, 61. infiltration water, 62. wetting curve, 71. geogrid, 72. fixing plate.

[0043] An energy-saving embankment drainage structure and construction method, as shown in Figure 1As shown, it relates to the field of energy-saving road construction. The embankment roadbed drainage structure takes the bottom center of the foundation 1 of the trapezoidal cross-section of the embankment roadbed as the lowest point, and fills multiple layers of roadbed fillers in the shape of a quadratic concave parabola towards the edges of both sides of the roadbed 2.

[0044] After the first layer of subgrade filler at the bottom of the multi-layer subgrade filler is compacted, the first layer of geogrid 71 is laid along the longitudinal direction of the subgrade, and then the second layer of subgrade filler is filled on the first layer of geogrid. The filling shape of the second layer of subgrade filler after compaction is also a quadratic concave parabola. The second layer of geogrid 71 is laid along the longitudinal direction of the subgrade on the second layer of subgrade filler, and multiple layers of subgrade filler and multiple layers of geogrid are laid alternately in this cycle until the filled subgrade filler reaches the designed subgrade 2 elevation. Strip fixing plates 72 are respectively set at the two transverse end points of each layer of geogrid 71. The top surface of the last layer of subgrade filler at the top is set horizontally, and the base layer 3 and pavement 4 are paved on the last layer of subgrade.

[0045] The foundation 1 is a soft soil foundation or a treated foundation that meets the design requirements; the roadbed 2 is the bearing structure layer of the base layer 3 and the pavement 4, which is filled and compacted with materials that meet the design requirements, and the roadbed and embankment are filled into a slope with a certain slope. The inside and outside of the roadbed 2 need to be drained smoothly. Too high a water content can reduce the strength and stability of the roadbed; the base layer 3 is the bearing structure layer of the pavement, which is filled and compacted with materials that meet the design requirements and requires smooth drainage; the pavement 4 is the direct bearing structure layer of the vehicle and requires smooth drainage. Under the load and action of the vehicle, the center and edge of the pavement produce a concave difference and settlement after construction.

[0046] The geogrid 71 is a bidirectional steel-plastic geogrid with strong tensile properties. The geogrid can be extended by ultrasonic welding or overlapping, and the overlapping length is not less than 50 cm. The vertical spacing height of each layer of geogrid 71 in the roadbed filler is 50 cm to 100 cm, and the number of layers depends on the roadbed height. The concave geogrid 71 can be laid out to effectively reduce the post-construction differential settlement of the road surface, base layer and roadbed.

[0047] The fixing plate 72 is a plastic thin plate with a cross-section height × length of (20cm~30cm) × (100cm~200cm), a thickness of 1cm~2cm, and a length extending longitudinally along the roadbed 2. The transverse end points of each layer of geogrid 71 are respectively welded to one side of each fixing plate 72, and the welding angles of each layer of geogrid 71 and each fixing plate 72 are right angles.

[0048] A drainage pipe 6 is embedded in the second layer of roadbed filler, and the drainage pipe drains the infiltrated water 61 in the road surface 4, base layer 3 and roadbed 2 into the left ditch 51 or the right ditch 52 at the bottom of the roadbed slope 21.

[0049] The drainage pipe 6 is a transverse drainage pipe embedded in the roadbed 2, draining infiltrated water 61 into the left and right ditches 51 and 52 on either side. To overcome uneven settlement of the roadbed, a flexible permeable hose (FH) is used. This flexible permeable hose is a composite geosynthetic pipe with a spring wire coil that has been treated for corrosion and coated with polyvinyl chloride (PVC) or other materials as a protective layer, and a permeable geotextile and polymer fiber braid as the pipe wall material. This pipe has strong deformation resistance. Other higher-strength pipes can also be used as drainage pipes.

[0050] The left ditch 51 and the right ditch 52 are drainage facilities on both sides of the bottom of the roadbed slope 21. The design sections of the left ditch 51 and the right ditch 52 must meet the requirements of discharging precipitation and infiltration water 61 inside and outside the roadbed to ensure the strength and stability of the roadbed 2.

[0051] The infiltration water 61 is the infiltration water that penetrates into the road surface, base layer and roadbed from natural precipitation, and forms an infiltration curve 62 in the roadbed due to the infiltration water.

[0052] The infiltration curve 62 is a distribution curve of the saturated water surface formed by natural precipitation penetrating into the roadbed 2 through the pavement 4 and the base layer 3 along the cross section of the roadbed. The lower the height of the infiltration curve 62, the higher the roadbed strength and stability, and the smaller the post-construction differential settlement. The left water level 53 is the height from the intersection of the infiltration curve 62 and the left slope to the bottom of the left ditch 51, and the right water level 54 is the height from the intersection of the infiltration curve 62 and the right slope 52 to the bottom of the right ditch.

[0053] The geogrid 71 mentioned above is taken as the calculation layer of the geogrid buried above the drainage pipe 6. The top width of the road surface 4 is B, and the horizontal distances between the slopes 21 on both sides and the fixed plates 72 at both ends are C1 and C2 respectively. Then the length between the fixed plates 72 at both ends of the geogrid 71 is l ,Right now l= C1+B+C2, so the vertical uniform load strength of the base 3 and pavement 4, roadbed filler and vehicle load within the width of B The vertical load strength from the fixed plates O and A at both ends to the top edge of the roadbed is linearly distributed. 、 The friction coefficient between the geogrid 71 and the roadbed filler is , the reaction force of geogrid is Take the longitudinal unit length of roadbed 2 for stress analysis, and analyze the geogrid 71 in two laying situations: one is the straight horizontal layout between the fixed plates O and A at both ends. When the roadbed settles unevenly, the geogrid curve is , the settlement of the midpoint D at the maximum settlement is ; second, the concave parabolic distribution between the two end fixed plate O, A , the maximum concave amount of the midpoint D is , when the uneven settlement of the geogrid curve is , the maximum settlement of the midpoint D is , the concave amount and settlement of the midpoint D are , the straight and parabolic geogrids are analyzed and the calculation formula is:

[0054] Formula one,

[0055]

[0056] Formula two,

[0057] According to the soil mechanics, elastic mechanics and force balance principle, the moment and horizontal force of the midpoint D of the left half geogrid are calculated, and the result is

[0058]

[0059] In the formula

[0060]

[0061] The vertical component of the frictional resistance of the straight and parabolic geogrids is

[0062]

[0063] The maximum concave amount of the parabolic geogrid is Generally greater than the maximum settlement of the straight geogrid It can be seen that the concave parabolic The geogrid is more than the straight geogrid, which can provide greater vertical support, that is, the tensile properties and vertical support of the geogrid can be better utilized, so the differential settlement of the roadbed and pavement can be effectively reduced; it can be seen that the greater the maximum concave amount of the concave parabolic geogrid The greater the vertical support provided is more significant;

[0064] The above analysis method is also applicable to the stress analysis of the remaining layers of geogrids, and the multi-layer geogrid can provide greater vertical support, effectively reducing the uneven settlement of the roadbed and pavement, and maintaining the normal drainage of the drainage pipe in the roadbed. Infiltration water in the subgrade and pavement;

[0065] The definitions of the symbols in formula one and formula two are as follows:

[0066] —respectively, the width of the base 3 and the top of the pavement 4, the distance from the left edge of the shoulder to the left fixed plate of the geogrid of the calculation layer, the distance from the right edge of the shoulder to the right fixed plate of the geogrid of the calculation layer, ;

[0067] —respectively, the parabolic equation of the maximum differential settlement of the linear geogrid of the calculation layer after the generation of the maximum differential settlement, the parabolic equation of the maximum sag of the curved geogrid, the parabolic equation of the maximum differential settlement of the curved geogrid after the generation of the maximum differential settlement, the abscissa with the midpoint of the line connecting the two fixed plates of the geogrid of the calculation layer as the coordinate origin, ;

[0068] —respectively, the maximum sag of the curved geogrid, the maximum differential settlement of the linear geogrid or the curved geogrid under the action of the vehicle load; in order to facilitate the filling and rolling construction of the subgrade filling, the maximum sag of the curved geogrid, the sag of each geogrid 71 is 3% to 5% of the width of the base and the top surface of the pavement 4; the sum of the multiple geogrids is limited within the maximum post-construction settlement, generally ≤ 30 cm; it is required that , ;

[0069] —respectively, the linear parameters of the parabola of the linear geogrid 71 after the generation of the maximum differential settlement at the edge and the center of the subgrade, ; ;

[0070] —respectively, the linear coefficients of the parabola of the curved geogrid 71 after the generation of the maximum sag at the edge and the center of the subgrade, ; ;

[0071] —respectively, the linear coefficients of the parabola of the curved geogrid 71 after the generation of the maximum differential settlement at the edge and the center of the subgrade, ; ;

[0072] —the horizontal length of the vertical center line of the two fixed plates of the geogrid 71 of the calculation layer, ;

[0073] —respectively, the horizontal length of the vertical center line of the two fixed plates of the geogrid 71 of the calculation layer, The strength of the embankment pavement filler and vehicle load, the geogrid of the calculated layer per unit longitudinal length of the embankment 2 The strength of the embankment pavement filler and vehicle load, the geogrid of the calculated layer per unit longitudinal length of the embankment 2 The strength of the embankment pavement filler and vehicle load, , ;

[0074] The frictional resistance coefficient between the geogrid 71 and the embankment filler, the ground reaction force coefficient, dimensionless, ;

[0075] The frictional resistance per unit area between the geogrid and the embankment filler after the maximum differential settlement of the linear geogrid 71 at the edge and the center of the embankment The frictional resistance per unit area between the geogrid and the embankment filler after the maximum differential settlement of the linear geogrid 71 at the edge and the center of the embankment , , ;

[0076] The angle between the concave parabolic end fixed plate O and the horizontal plane of the calculated layer geogrid, the angle between the fixed plate A and the horizontal plane, the angle between any place of the parabola generated by the differential settlement of the linear geogrid The angle between any place of the parabola generated by the differential settlement of the curved geogrid and the horizontal plane, , ;

[0077] The tensile force at the fixed plate O after the differential settlement of the calculated layer curved geogrid per unit longitudinal length, The tensile force at the center D of the embankment, the allowable tensile force of the geogrid, ;

[0078] The ratio of the vertical component sum of the frictional resistance of the linear geogrid and the parabolic geogrid, dimensionless;

[0079] The coefficient, .

[0080] The construction method of the energy-saving filled embankment drainage structure mainly includes the following steps:

[0081] Step one, select raw materials

[0082] 1. According to the design drawings, the initial model and specifications of the geogrid 71 and the drain pipe 6 are determined, and the technical indicators of the roadbed filler, the base 3 and the pavement 4, and the drain pipe 6, including water permeability and drainage, are detected;

[0083] 2. According to the height of the roadbed filler, the thickness of the base 3 and the pavement 4, the vehicle load, and the concave amount of the secondary parabola under each layer of geogrid, the differential settlement amount is estimated, and the diameter of the drain pipe is calculated and reviewed by formula, and the welding process of the geogrid and the fixing plate is determined;

[0084] 3. The geogrid 71 and the fixing plate 72 are sampled and tested for welding, and the welding of the geogrid and the fixing plate meets the force requirement;

[0085] Step 2, processing the foundation

[0086] 1. Measure and lay out the foundation according to the design requirements;

[0087] 2. Test the processed foundation and ensure that it meets the design requirements;

[0088] Step 3, burying the drain pipe and laying the geogrid and filling layer by layer

[0089] 1. Fill the first layer of roadbed filler on the foundation and compact it with a road roller. Remove the sharp-edged stones from the roadbed filler. Lay the drain pipe 6, and the cross slope of the drain pipe meets the design requirements;

[0090] 2. Fill the roadbed filler and trim the secondary parabolic concave amount and curve shape to meet the design requirements:

[0091] 3. Lay the first layer of geogrid 71, and the geogrid is stretched and laid flat;

[0092] 4. Weld the two ends of the stretched geogrid to the fixing plate 72;

[0093] 5. Embed half the height of the fixing plate 72 on both sides of the roadbed filler, and the embedding angle of the fixing plate meets the design requirements;

[0094] 6. Fill the second layer of roadbed filler on the top surface of the first layer of geogrid, and compact it with a road roller without touching the geogrid and the fixing plate. The parabolic concave amount and curve shape are set according to the calculated value of the second layer of geogrid;

[0095] 7. Repeat the above steps until all layers of geogrid and roadbed filler are completed;

[0096] Step 3, base and pavement construction

[0097] 1. Construct the base 3 and the pavement 4 according to the design requirements:

[0098] 2. The quality of the detection meets the design requirements.

[0099] The above is only a specific embodiment of the present application, and those skilled in the art should understand that any equivalent structural design of the embodiment should be included in the protection scope of the present application.

Claims

1. An energy-saving embankment subgrade drainage structure, characterized by The filling embankment drainage structure is with the bottom center of the filling embankment trapezoidal cross-section foundation (1) as the lowest point, and the multiple layers of embankment fillers are filled in the shape of the quadratic concave parabola to the two side edges of the embankment (2) in turn, the first layer of embankment filler at the bottom is laid along the longitudinal direction of the embankment after compaction to form the first layer of geogrid (71), then the second layer of embankment filler is filled on the first layer of geogrid, the filling shape of the second layer of embankment filler after compaction is also the quadratic concave parabola, the second layer of geogrid (71) is laid along the longitudinal direction of the embankment on the second layer of embankment filler, and the multiple layers of embankment fillers and the multiple layers of geogrids (71) are alternately laid in turn according to the cycle, until the filling embankment filler reaches the design embankment elevation, the horizontal two end points of each layer of geogrid (71) are respectively provided with the strip-shaped fixed plate (72), the top surface of the last layer of embankment filler at the top is horizontally arranged, and the base layer (3) and the pavement (4) are laid on the last layer of embankment; the second layer of embankment filler is embedded with the drainage pipe (6), and the infiltration water (61) in the pavement (4), the base layer (3) and the embankment (2) is drained into the left ditch (51) or the right ditch (52) at the bottom of the embankment slope by the drainage pipe; the geogrid (71) takes the layer of geogrid embedded above the drainage pipe as the calculation layer, the top width of the pavement (4) is B, the horizontal distance between the two side slopes (21) to the two end fixed plates (72) is C1 and C2 respectively, then the length between the two end fixed plates of the layer of geogrid is C1+B+C2, so the vertical uniformly distributed load strength of the base layer and the pavement, the embankment filler and the vehicle load in the B width is l , that is l= C1+B+C2, so the vertical uniformly distributed load strength of the base layer and the pavement, the embankment filler and the vehicle load in the B width is The vertical load strength from the two end fixed plates O and A to the top edge of the embankment is linearly distributed , The friction coefficient between the geogrid (71) and the embankment filler is , and the counterforce of the geogrid (71) is ; The symbols in the formula are defined as follows: - the width of the base (3) and the top of the road surface (4), respectively, the distance from the left edge of the shoulder to the left fixing plate of the geogrid of the calculation layer, the distance from the right edge of the shoulder to the right fixing plate of the geogrid of the calculation layer, ; - the parabolic equation after calculating the maximum differential settlement of the straight geogrid of the layer the horizontal coordinate of the midpoint of the connecting line of the fixed plates at both ends of the geogrid of the layer as the coordinate origin, ; - straight geogrids (71) respectively at the edges and in the center of the embankment producing the maximum differential settlement linear parameters of the parabola, ; - calculating the horizontal length of the vertical midline of the end plate (72) of the geogrid (71), ; — the geogrid for the subgrade unit longitudinal length calculation layer — the geogrid for the subgrade unit longitudinal length calculation layer — the geogrid for the subgrade unit longitudinal length calculation layer — the geogrid for the subgrade unit longitudinal length calculation layer , ; - coefficient of ground reaction forces, dimensionless, ; Ratio of the sum of the vertical components of the frictional forces of the straight and parabolic layouts of the geogrids, dimensionless.

2. The energy-saving embankment subgrade drainage structure according to claim 1, characterized in that The geogrid (71) is a two-way steel plastic geogrid, and a concave geogrid arrangement is adopted. The geogrid (71) is formed by ultrasonic welding or lapping, and the lapping length is not less than 50 cm. The height of the geogrid (71) in the roadbed filler is 50-100 cm, and the number of layers is determined according to the height of the roadbed (2).

3. The energy-saving embankment subgrade drainage structure according to claim 1, characterized in that The fixing plate (72) is a plastic sheet with a cross-section of (20-30 cm) x (100-200 cm) and a thickness of 1-2 cm. The length extends along the longitudinal direction of the roadbed. The two ends of each layer of geogrid (71) are welded to one side of each fixing plate (72), and the welding angle of each layer of geogrid (71) and each fixing plate (72) is a right angle.

4. The energy-saving embankment subgrade drainage structure according to claim 1, characterized in that The drainage pipe (6) is a horizontal drainage pipe embedded in the roadbed (2) to drain the infiltration water (61) in the roadbed into the left ditch (51) or the right ditch (52) at the bottom of the road slope. The drainage pipe (6) is a soft permeable pipe.

5. The energy-saving embankment subgrade drainage structure according to claim 1, characterized in that The infiltration water (61) is the infiltration water of natural precipitation into the pavement (4), the base (3), and the roadbed (2), and the infiltration curve (62) is formed in the roadbed.

6. The energy-saving embankment subgrade drainage structure according to claim 5, characterized in that The infiltration curve (62) is the distribution curve of the saturated water surface formed by the natural precipitation through the pavement (4), the base (3), and into the roadbed (2). The intersection point of the infiltration curve (62) and the left slope to the height of the ditch bottom of the left ditch (51) forms the left water level (53), and the intersection point of the infiltration curve (62) and the right slope to the height of the ditch bottom of the right ditch (52) forms the right water level (54).

7. The construction method of an energy-saving type filled roadbed drainage structure according to any one of claims 1-6, characterized in that The construction method comprises the following steps: Step one, selecting raw materials 1. According to the design drawings, initially determine the type, specification, and main technical indicators of the geogrid and the drainage pipe. Test the technical indicators of the roadbed filler, the base (3), the pavement (4), and the drainage pipe (6), including water infiltration and drainage.

2. According to the height of the subgrade filler, the thickness of the base layer (3) and the pavement (4), the vehicle load, the concave amount of the parabola of each layer of geogrid , the estimated differential settlement amount and the diameter of the drain pipe, the stress of each layer of geogrid, the diameter of the drain pipe (6) are calculated and reviewed by the formula, and the welding process of the geogrid (71) and the fixing plate (72) is determined; 3. Sample the geogrid (71) and the fixing plate (72) for welding test. The welding of the geogrid and the fixing plate meets the force requirement. Step two, processing the foundation 1. Measure and lay out the foundation according to the design requirements.

2. Test the processed foundation and ensure that it meets the design requirements. Step three, embedding the drainage pipe and laying the geogrid and filling layer by layer 1. Fill the first layer of roadbed filler on the foundation (1) and compact it with a road roller. Remove the stones with sharp edges and corners from the roadbed filler. Lay the drainage pipe (6), and the horizontal slope of the drainage pipe meets the design requirements.

2. Fill the roadbed filler and trim the concave amount and the curve shape of the second parabola to meet the design requirements.

3. Lay the first layer of geogrid (71) and stretch it flat.

4. Weld the two ends of the stretched geogrid to the fixing plate (72).

5. Embed the fixing plate (72) to half the height on both sides of the roadbed filler. The embedding angle of the fixing plate (72) meets the design requirements. 6、In the first layer of geogrid top surface filling second layer of subgrade filling, the road roller compaction does not touch the geogrid (71) and the fixed plate (72), the parabolic concave amount and the curve shape are set according to the second layer of geogrid calculation value; 7、By analogy, until all the layers of geogrid (71) and subgrade filling are completed; Step three, base and pavement construction 1、According to the design requirements, the base (3) and pavement (4) are constructed; 2、The detection quality meets the design requirements.

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