CN115652717A - High-fill roadbed construction method - Google Patents

Abstract

The invention provides a high fill roadbed construction method, which belongs to the technical field of roadbed construction processes and comprises the following steps: pre-treating the soil body of the pre-filled square road section; filling phyllite on the pretreated soil body to a first preset height, and then carrying out general tamping treatment; when the soil body settlement after the general tamping treatment meets an allowable value, filling and leveling a tamping pit and leveling a embankment; arranging a geogrid on the embankment; and repeatedly filling phyllite on the geogrid to the designed height, and building the embankment slope and the side slope protection body. The construction method of the high fill subgrade provided by the invention takes local materials and uses phyllite of expressways, tunnel curbs and mountain body extension lines as filling materials, so that the engineering investment of transferring metamorphic rocks in the related technology can be reduced, and the land occupation and the adverse effect on the environment are reduced. And shorten the soil by ramming the soilThe time required by natural sedimentation of the body can be prolonged, the working efficiency can be improved, and the time consumed by filling engineering can be shortened _。

Description

High-fill roadbed construction method

Technical Field

The invention relates to the technical field of roadbed construction processes, in particular to a high fill roadbed construction method.

Background

The highway as a modern traffic sign greatly improves the traffic conditions in regions along the line, has obvious optimization and promotion effects on the structures of population, economy, industry and the like in peripheral regions, and provides convenience for traveling. Due to the fact that metamorphic rocks are widely distributed in tunnel holes excavated along mountains and constructed along expressways, the landform on the side of a backer is steep, the valley stage is narrow, and the house, land acquisition and liberation are extremely difficult.

In the related art, metamorphic rocks are widely distributed in China and are mostly distributed in a connected mode, and most of the modes for processing the metamorphic rocks are that the collected metamorphic rocks are transported to an open field through vehicles.

In the practical application process, the processing method adopted by the related technology has the following technical defects:

a large number of abandoned parties and borrowed parties have great influence on the agriculture and ecological environment along the line, and the treatment method of abandoning a large number of metamorphic rocks after transportation increases the engineering investment and can not recycle the metamorphic rocks, thereby causing the waste of natural resources.

Disclosure of Invention

In view of the above, the present invention aims to provide a method for constructing a high fill roadbed, which uses local materials and uses abandoned phyllite as roadbed filler, thereby reducing the engineering investment and bringing economic, social and environmental benefits.

In a first aspect, an embodiment of the present invention provides a high fill subgrade construction method, where the method includes:

pre-treating the soil body of the pre-filled square road section;

filling phyllite on the pretreated soil body to a first preset height, and then carrying out general tamping treatment;

when the soil body settlement after the general tamping treatment meets an allowable value, filling and leveling a tamping pit and leveling a embankment;

arranging a geogrid on the embankment;

repeatedly filling phyllite on the geogrid to a designed height, and building a embankment slope and a side slope protection body;

coarse particles are paved on the top surface of the embankment to reduce deformation of the roadbed and improve the strength and rigidity of the embankment.

Optionally, the step of preprocessing the soil body of the pre-filled road section includes:

paving coarse grains on the pre-filling road section along the roadbed waterline to a first preset height;

cleaning the surface of the coarse particles; leveling the surface of the cleaned coarse particles;

and drainage channels are arranged on two sides of the coarse particles after leveling treatment.

Optionally, the step of leveling the surface of the pre-filled road section to be cleaned comprises:

and filling up the depressions on the surface of the pre-filled road section by gravel materials, or replacing and filling up the soft soil layer.

Optionally, before the step of performing the general tamping treatment after filling phyllite to a first preset height on the pretreated soil body, the method includes:

calibrating a plurality of universal ramming positioning points according to a preset calibration rule;

hoisting a rammer to tamp the soil body at the general ramming positioning point;

and after a preset time interval, repeatedly tamping until the soil body settlement meets an allowable value.

Optionally, the step of performing tamper processing after filling phyllite to a first preset height on the pretreated soil body includes:

and (4) performing general tamping according to the principle that the middle line faces to two sides.

Optionally, the slope protection body is of a multi-stage structure.

Optionally, the method further comprises:

and a side slope drainage system is arranged on the side slope protection body.

Optionally, the side slope protection body includes first order side slope, second level side slope and third level side slope from top to bottom in proper order, the slope ratio of first order side slope is 1:1.5; the slope ratio of the second-stage side slope is 1:1.75; the slope ratio of the third-stage slope is 1:2.

optionally, the method further comprises:

and constructing a side slope platform between the two adjacent side slope protection bodies.

Optionally, the width of the slope platform is greater than or equal to 2m.

The embodiment of the invention has the following beneficial effects: the invention provides a high fill roadbed construction method, which comprises the following steps: pre-treating the soil body of the pre-filled square road section; filling phyllite on the pretreated soil body to a first preset height, and then carrying out general tamping treatment; when the soil body settlement after the general tamping treatment meets an allowable value, filling and leveling a tamping pit and leveling a embankment; arranging a geogrid on the embankment; repeatedly filling phyllite on the geogrid to a designed height, and building a embankment slope and a side slope protection body; coarse particles are paved on the top surface of the embankment to reduce deformation of the roadbed and improve the strength and rigidity of the embankment.

The construction method of the high fill subgrade provided by the invention takes local materials and uses phyllite of expressways, tunnel curbs and mountain body extension lines as filling materials, so that the engineering investment of the transfer curbs in the related technology can be reduced, and the land occupation and the adverse effect on the environment are reduced. And the time required by the natural settlement of the soil body is shortened by the operation of the general tamping, so that the working efficiency can be improved, and the time consumed by the filling engineering is shortened.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic flow chart of a high fill roadbed construction method provided by embodiment 1 of the invention;

fig. 2 is a schematic flow chart of another high fill roadbed construction method provided in embodiment 2 of the invention;

fig. 3 is a schematic flow chart of another high fill roadbed construction method provided by the embodiment 3 of the invention;

fig. 4 is a schematic cross-sectional view of a general ramming embankment in an example construction scheme provided in embodiment 3 of the present invention.

The reference numbers are as follows:

1-a first-stage side slope, 2-a second-stage side slope, 3-a third-stage side slope, 4-a side slope platform, 5-geogrids, 6-a phyllite filling layer and 7-a general ramming layer.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For the convenience of understanding the present embodiment, the technical terms designed in the present application will be briefly described below.

Phyllite is an oxide containing quartz, feldspar, chlorite, black, muscovite and iron as main mineral components, and has a lamellar structure, so that the phyllite has a high-strength joint characteristic. Under various confining pressures, the rock mass is sheared along the weak surface, and under high confining pressure, the shearing action of crossing the weak surface is usually generated; and has tensile fracture characteristic under low confining pressure. The phyllite on the section of the highway contains more mica components, has soft property, belongs to medium metamorphic rocks, is mostly in a lamellar structure, has extremely developed joint cracks and is mostly cut into pieces or slices. Almost all phyllite rock bodies and parent rocks are phyllite collapse slope and broken and block rock soil distribution along the line. The stratum time is related to metamorphic rock series of ancient mud basin (D), like system (S), ordovician system (O), stone charcoal and di-iterative system (C + P), middle-birth three-iterative system Xikang group and new-birth fourth system. The lithology is mainly schist, slate, phyllite and the like, under the influence of later tectonic movement, reticular quartz is commonly seen in rock mass, and the compressive strength of weakly weathered rock is mostly lower than 5MPa, so that the rock mass belongs to extremely soft rock.

The roadbed is a foundation of a track or a road surface and is an earth structure formed by excavation or filling. The roadbed mainly has the functions of providing necessary conditions for track or road surface laying and train or traveling operation, bearing static load and dynamic load of track and locomotive vehicle or road surface and traffic load, and transmitting and diffusing the load to the deep part of the foundation.

The roadbed is a roadbed part within 80cm below the ground of the road surface and bears the load transmitted by the road surface.

After introducing the technical terms related to the present application, the following briefly introduces the application scenarios and design ideas of the embodiments of the present application.

At present, with the rapid development of social economy, roads are built and told to accelerate transportation or improve the convenience of travel. The highway as a modern traffic sign can drive traffic conditions, economic benefits and the like in regions along the line. Due to the fact that metamorphic rocks are widely distributed in tunnels excavated along mountains and built along the extension line of the expressway, the terrain close to the mountains is steep, and the metamorphic rocks are accumulated to block the expressway, so that vehicle running is affected.

In the related art, a large amount of phyllite exists in metamorphic rocks, and the metamorphic rocks are removed at present in a mode of collecting and transporting the metamorphic rocks to an open field, so that borrowing and land occupation are needed, and land occupation for a long time can generate great influence on the ecological environment.

Therefore, the embodiment provides a high-fill roadbed construction method, which uses local materials and abandon metamorphic rocks as roadbed fillers, can reduce engineering investment and bring economic, social and environmental benefits.

Example 1

Referring to fig. 1, the present embodiment provides a method for constructing a high fill subgrade, including the following steps:

and S110, preprocessing the soil body of the pre-filled road section.

And S120, filling phyllite on the pretreated soil body to a first preset height, and then performing general tamping treatment.

And S130, filling and leveling a tamping pit and leveling an embankment when the soil body settlement after the common tamping treatment meets the allowable value.

And S140, arranging a geogrid on the embankment.

And S150, repeatedly filling phyllite on the geogrid, carrying out general tamping treatment to the designed set height, and building the embankment slope surface and the side slope protection body.

And S160, paving coarse particles on the top surface of the embankment to reduce the deformation amount of the roadbed and improve the strength and the rigidity of the embankment.

In the embodiment, local materials are used for constructing the phyllite in the metamorphic rock along the mountain and in the tunnel of the highway as filling materials, so that the engineering investment, the labor amount for manual transportation and cleaning, the land occupation and the adverse effect on the ecological environment can be reduced; and after pretreatment, the phyllite is filled and then is subjected to general tamping reinforcement until soil body settlement meets an allowable value, so that the soil body settlement is accelerated, the time required by natural settlement of the soil body is shortened, the filling efficiency is improved, and the economic, social and environmental benefits are improved.

In step S110 of this embodiment, the step of preprocessing the soil body of the pre-filled road section is used to clean the site to be filled to meet the requirement of the filling surface.

In step S120 of this embodiment, phyllite is filled on the pretreated soil body to a first preset height, and then ramming is performed to accelerate soil body settlement and supplement soil body strength. In this embodiment, in order to improve the soil stability, a layered filling manner is adopted, the filling height of each layer is not greater than 30cm, and after filling to 6m height each time, the general tamping treatment is performed to accelerate the soil settlement and supplement the soil strength.

In step S130 of this embodiment, when the soil body settlement meets the allowable value, the tamping pit is filled and the embankment is filled, so that the time required for natural settlement of the soil body is shortened by using the general tamping method, the efficiency of the filling engineering can be improved, and the engineering investment can be reduced.

In step S140 of this embodiment, a geogrid is disposed on the soil body, and the geogrid is used to increase the overall strength and stability of the embankment. As an implementable mode, the bidirectional polypropylene geogrid is adopted, and the tensile strength of the bidirectional polypropylene geogrid is more than or equal to 80KN. As another practical mode, 1 group of geogrids are additionally arranged in the steep slope embankment, and the embankment is used for entity slope protection or flat protection engineering to avoid rainwater from scouring the side slope.

In step S150 of this embodiment, phyllite is continuously filled on the geogrid to the designed height, and the embankment slope and the side slope protection body are constructed. The design height is 1.0-1.2 m at the bottom of the roadbed. In this embodiment, the set height is 1.2m from the bottom of the roadbed. According to the requirement of roadbed filling, the roadbed filling has certain strength. And (4) according to the experiment result of the phyllite indoor unit, configuring the experiment according to the optimal moisture content, and carrying out a bearing ratio (CBR) experiment. The test results of the materials of each group are shown in Table 1-1 when the penetration amount is 5.0 mm:

TABLE 1-1

From table 1-1, it can be seen that the sampled phyllite does not satisfy the requirement of 8% of the strength of the filling material of the upper roadbed, but satisfies the requirement of the CBR value of the filling material of the lower roadbed in the specification, the CBR value of the phyllite in the road section is generally low, and although the CBR value of the filling material of the lower roadbed in the specification can be satisfied, the CBR value of the phyllite in the road section is close to the lower limit of the specification value, which shows that the stability of the phyllite is extremely poor, so that the phyllite can meet the filling requirement when being used for embankment filling material, the distance is 1.2m lower than the binding surface of the upper roadbed.

The experimental analysis shows that most phyllite containing more mica components is of a single-grain structure, the self cohesive force is very small, the shear resistance received in the compaction process is mainly the inter-grain friction force, and the shear resistance mainly comprises the sliding friction, the occlusion friction, the grain crushing effect and the rearrangement effect among grains. The phyllite as the embankment filler is easy to break and compact to reach the required compactness. However, the phyllite has poor stability after being soaked in water, so that the roadbed is easy to be unstable, and therefore the preset height is set within 1.2m of the bottom of the roadbed.

In step S160 of this embodiment, the embankment slope and the side slope protection body are constructed to block damage of external water sources such as rainwater to the phyllite filling layer, so as to improve stability.

Optionally, the step of preprocessing the soil body of the pre-filled road section includes:

and paving coarse granules to a first preset height on the pre-filled road section along the water level line of the roadbed.

Cleaning the surface of the coarse granules; and leveling the surface of the cleaned coarse particles. And drainage channels are arranged on two sides of the coarse particles after leveling treatment.

In this embodiment, the road surface of the prefilled section is cleaned, loose paving is performed on the road surface of the prefilled section, the loose paving layer is rolled by a bulldozer or a road roller, and the filled coarse granules are leveled, in this embodiment, the thickness of the loose paving layer is less than or equal to 30cm, and in this embodiment, the thickness of the loose paving layer is 30cm. The loose laying of the coarse particle cushion layer of the coarse particles can prevent capillary water from rising to influence the phyllite filler.

The filling material is pushed and leveled by a bulldozer, and the soil layer with high strength in the hollow or soft soil layer is leveled or replaced and filled, so that the machine passage and tamping are facilitated.

Optionally, the step of leveling the surface of the cleared pre-filled road segment comprises: and filling the depressions on the surface of the pre-filled road section by adopting coarse particles, or replacing and filling the soft soil layer. The high fill embankment is recommended to be filled to 50cm above the original ground.

In this example, coarse grains such as gravel sand are used to prevent capillary water from rising and affecting the phyllite packing.

Example 2

With reference to fig. 2, this embodiment provides another high fill roadbed construction method, which includes the following steps:

and S210, preprocessing the soil body of the pre-filled road section.

And S220, after phyllite is filled in the pretreated soil body, calibrating a plurality of common tamping positioning points according to a preset calibration rule.

And S230, hoisting a rammer to tamp the soil body at the general ramming positioning point.

And S240, after a preset time interval, repeatedly compacting until the soil settlement meets an allowable value.

And S250, filling the tamping pit and filling the embankment when the soil body settlement after the general tamping treatment meets the allowable value.

And S260, arranging a geogrid on the embankment.

And S270, repeatedly filling phyllite on the geogrid, carrying out general tamping treatment to the designed height, and building the embankment slope and the side slope protection body.

And S280, paving coarse particles on the top surface of the embankment to reduce the deformation amount of the roadbed and improve the strength and the rigidity of the embankment.

In the embodiment, the general tamping positioning points are marked on the filled soil layer, and the general tamping operation is repeated, so that the soil body is tamped for multiple times to accelerate the settlement of the soil body, the time required by the natural settlement of the soil body is shortened, and the engineering period is shortened.

In this embodiment, before the general tamping treatment, the construction site needs to be cleaned and leveled firstly, and the construction site can bear the tamping mechanical load, and all underground obstacles and underground pipelines need to be clear and filled in advance to the height of 1.5m before construction. And temporary drainage ditches are dug at two sides of the general tamping area. And then calibrating the plurality of universal ramming positioning points according to a preset calibration rule, wherein in this embodiment, the preset calibration rule can be set according to actual engineering requirements, the preset calibration rule is arranged in a quincunx manner in this embodiment, and the distance between two adjacent universal ramming positioning points is 1.5m.

After that, the crane is in place to hoist the rammer to tamp the soil body at the position of the general rammer positioning point, specifically, the center of the rammer is aligned with the general rammer positioning point, the elevation of the top of the rammer before ramming is measured, the rammer is hoisted to a preset height, the unhooking device is started, after the unhooking of the rammer freely falls down, the lifting hook is put down, the elevation of the top of the rammer is measured, if the rammer is inclined due to the inclination of the pit bottom, the pit bottom is leveled in time, weathered stones with high strength are adopted as the fillers, the amount of the fillers is recorded until the specified ramming times and the control standard are met to complete the ramming of a pier body. When the construction is influenced by extruding soft soil around the general tamping positioning point, the excavator is used for digging out and cleaning at any time. And then, repeating the general tamping operation corresponding to different general tamping positioning points in sequence. And (4) leveling the field again after the first general tamping treatment is finished, fully tamping for two times after preset time, loosening the soil on the surface layer and tamping, and measuring the elevation of the field after tamping. Wherein the preset time is determined by the dissipation time of the hyperstatic pore water pressure in the soil. When actual measurement data is lacked, the permeability of the foundation soil can be determined, and the preset time for the cohesive soil foundation with poor permeability is not less than 3-7 days; the foundation with good permeability can be continuously rammed. For sandy soil, due to good water permeability, the tamping pore pressure is quickly dissipated, and the sand can be continuously tamped. For cohesive soil, the ramming can be continuously carried out only after 2 weeks.

In the process, the average subsidence of the field is measured after each tamping, and then the tamping pit is leveled by soil and stones so as to carry out the next tamping. In addition, during general tamping, certain vibration can be generated on the foundation and surrounding buildings, tamping points are more than 15m away from the existing buildings, if the distance is insufficient, a damping ditch is dug between a general tamping positioning point and the buildings, the depth of the damping ditch exceeds the depth of the foundation of the buildings, enough length is needed, and the influence degree on the adjacent buildings is observed.

The tamping times of the general tamping positioning points are determined according to a relationship curve between the tamping times and the tamping settlement obtained by field trial tamping, and the following conditions are satisfied simultaneously: the average ramming amount of the last two strokes is not more than 50mm; the bottom surface around the tamping pit should not be excessively raised; the hammer lifting difficulty caused by too deep tamping pit does not occur.

Optionally, the step of performing tamper processing after filling phyllite on the pretreated soil body includes: and (4) performing general tamping according to the principle that the middle line faces to two sides.

Example 3

With reference to fig. 3, this embodiment further provides a method for constructing a high fill subgrade, where the method includes the following steps:

and S310, preprocessing the soil body of the pre-filled road section.

S320, filling phyllite on the pretreated soil body to a first preset height, and then carrying out general tamping treatment;

s330, filling and leveling the tamping pit and leveling the embankment when the soil body settlement after the general tamping treatment meets the allowable value.

And S340, arranging a geogrid on the embankment.

And S350, repeatedly filling phyllite on the geogrid to the designed height, and building the embankment slope and the side slope protection body.

And S360, digging a drainage system on the slope protection body.

And S370, paving coarse particles on the top surface of the embankment to reduce deformation of the roadbed and improve the strength and rigidity of the embankment.

In the embodiment, the phyllite filling is carried out after the pre-filling road section is pretreated, the soil body deposition speed is accelerated in a general tamping mode, and the waterproof structure is arranged, so that rainwater erosion is prevented by isolating, and the risk that the phyllite filling layer is softened and disintegrated when meeting water is reduced. Longitudinal and transverse drainage systems are arranged in the roadbed, so that the problem that water does not invade the land to cause embankment instability and form quality hidden troubles is solved.

In this embodiment, dig on side slope protection body and establish vertical, horizontal drainage system to guarantee that water does not enter into the embankment, can discharge rainwater water conservancy diversion like this, reduce the influence of rainwater to the road bed filling, avoid having the potential safety hazard.

Optionally, the side slope protection body includes first order side slope, second level side slope and third level side slope from top to bottom in proper order, the slope ratio of first order side slope is 1:1.5; the slope ratio of the second-stage side slope is 1:1.75; the slope ratio of the third-stage slope is 1:2.

in this embodiment, the slope ratio of the slope protection body is gradually reduced from top to bottom, i.e. the slope is gradually decreased from top to bottom.

Optionally, the method further comprises: and a side slope platform is arranged between two adjacent side slopes.

In this embodiment, it can receive the garrulous rock etc. to set up the side slope platform.

Optionally, the width of the slope platform is greater than or equal to 2m.

In this embodiment, referring to fig. 4, a high fill subgrade construction method provided by the present application is further described by taking a highway from Guangyu to Pingwu as an example:

the Guangyuan-Pingwu expressway is a highway network in Sichuan province, plans an east-west transverse line connecting Guangan and Mianjiu expressway, starts from Maxiang riding in Qingchuan county, connects the G75 Lanhai expressway Chuangan district to Guangyuan section of the built traffic vehicle, passes through rubble, huang Ping, a dam, a Lean, a Bixi, a three-pot, a bridge building, a Qingxi and Pingwu county, passes through villages, ancient cities and mother home mountains in the Guangdu county, connects the Miyang to the Jiuzhaigou expressway, and has a total length of 91.2km.

Due to the fact that metamorphic rocks are widely distributed in the tunnel slag of the tunnel constructed along the mountain excavation and the highway along the line. The climate, the terrain and the geological conditions along the line are complex, the ecological environment, the geological environment and the fragility thereof are high, the terrain on the mountain leaning side is steep, the valley stage is narrow, and the land abandoning, land seeking and borrowing are extremely difficult. Meanwhile, a large amount of abandoned and borrowed parties have great influence on agriculture and ecological environment along the line, and water and soil loss is aggravated.

Presetting the center filling height of the section of expressway to be 28.15m, the processing length to be 182m, and the filling slope ratio to be 1:1.5-1:2.0.

In the specific implementation process, firstly, preprocessing the soil body of the pre-filled road section: paving coarse grains of coarse grain materials along a roadbed waterline, wherein the thickness of the coarse grains is 15-30cm, and the coarse grains are used for preventing capillary water from rising and avoiding the influence of the capillary water on the filling materials-phyllite above; after laying the coarse granules, rolling the coarse granules to level the surfaces of the coarse granules, and digging drainage channels at two sides of the coarse granules so as to remove water.

And then, filling phyllite on the pretreated soil body to form a phyllite filling layer 6, and calibrating the common tamping positioning point according to the calibration rule after the filling height reaches 6 m. The crane is hoisted to ram the rammer positioning point, and the rammed soil body is tested and measured in strength. According to engineering regulations, the settlement of the first time is recorded after every three times of strokes. After the whole test section is tamped for the first time, the tamping surface is leveled by a bulldozer and a loader, the tamping is carried out for the second time, the settlement amount of the second time is recorded, if the settlement amount of the second time is less than 5cm, the site only needs to be tamped once, if the settlement amount of the second time is more than 5cm, the tamping needs to be carried out for the third time, the settlement amount of the tamping of each time is recorded, and the times of tamping the site are reduced for the times corresponding to the settlement amount less than 5cm according to the regulations. And if the settlement is less than 5cm after the third tamping, the field only needs to be tamped for 2 times to form a common tamping layer 7. And then, repeating the operation of the general tamping treatment after a preset time interval until the soil body settlement meets an allowable value. And then, leveling the ground by a bulldozer, filling the tamping pit and leveling the embankment.

Then, a geogrid made of bidirectional polypropylene is laid on the leveled soil body, 1 group of geogrids is additionally arranged in the middle of the steep slope embankment, then, the geogrid 5 is continuously filled with phyllite layers, then, the general tamping is repeated to form a general tamping layer 7, and then, a tamping pit is filled and the embankment is leveled. Meanwhile, embankment slope and side slope protection bodies are built synchronously, and as shown in fig. 4, each side slope protection body comprises a first-stage side slope 1, a second-stage side slope 2, a third-stage side slope 3 and a side slope platform 4.

A water protection layer and a protection side slope are built on the soil body after the secondary common tamping treatment, the influence of rain wash on phyllite filling is avoided, a drainage channel is dug to guide and discharge rain on the protection side slope, and the influence of the rain on the phyllite filling layer 6 is avoided.

And finally, paving coarse particles on the top surface of the embankment to reduce deformation of the roadbed and improve the strength and rigidity of the embankment.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A high fill subgrade construction method is characterized by comprising the following steps:

preprocessing the soil body of the pre-filled road section;

filling phyllite on the pretreated soil body to a first preset height, and then carrying out general tamping treatment;

when the soil body settlement after the general tamping treatment meets an allowable value, filling and leveling a tamping pit and leveling a embankment;

arranging a geogrid on the embankment;

repeatedly filling phyllite on the geogrid to the designed height, and building a embankment slope surface and a side slope protection body;

coarse particles are paved on the top surface of the embankment to reduce deformation of the roadbed and improve the strength and rigidity of the embankment.

2. The method for constructing a high fill subgrade according to claim 1, wherein the step of pretreating the soil mass of the pre-filled section of road comprises the following steps:

paving coarse grains on the pre-filling road section along the roadbed waterline to a first preset height;

cleaning the surface of the coarse particles; and the number of the first and second electrodes,

leveling the surface of the cleaned coarse particles;

and drainage channels are arranged on two sides of the leveled coarse granules.

3. The method of constructing a high fill subgrade according to claim 2, wherein said step of leveling the surface of said coarse aggregate after cleaning comprises:

filling and leveling the surface pits of the coarse grains by using gravels, or replacing and filling the soft soil layer.

4. The method for constructing a high fill subgrade according to claim 1, wherein before the step of performing the general tamping treatment after filling phyllite to a first preset height on the pretreated soil body, the method comprises the following steps:

calibrating a plurality of universal ramming positioning points according to a preset calibration rule;

hoisting a rammer to tamp the soil body at the general ramming positioning point;

and after a preset time interval, repeatedly tamping until the soil body settlement meets an allowable value.

5. The method for constructing a high fill subgrade according to claim 1, wherein the step of performing the general tamping treatment after filling phyllite to a first preset height on the pretreated soil body comprises the following steps:

and (4) performing general tamping according to the principle that the middle line faces to two sides.

6. The high fill subgrade construction method according to claim 1, further comprising:

the side slope protection body is of a multi-stage structure.

7. The high fill subgrade construction method according to claim 6, further comprising:

and a side slope drainage system is arranged on the side slope protection body.

8. The high fill subgrade construction method according to claim 1, characterized in that the side slope protection body sequentially comprises a first-stage side slope, a second-stage side slope and a third-stage side slope from bottom to top, and the slope ratio of the first-stage side slope is 1:1.5; the slope ratio of the second-stage side slope is 1:1.75; the slope ratio of the third-stage slope is 1:2.

9. the high fill subgrade construction method according to claim 1, further comprising:

and constructing a side slope platform between the two adjacent side slope protection bodies.

10. The high fill subgrade construction method according to claim 9, characterized in that the width of the slope platform is greater than or equal to 2m.

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