CN111304987A - High-speed foam light soil roadbed structure in mountain area - Google Patents

Abstract

The invention discloses a high-speed foam light soil roadbed structure in a mountainous area, and belongs to the technical field of roadbed and side slope construction. The roadbed structure comprises steps, the lowest stage end of each step is provided with a downwardly extending retaining wall, a concrete base is arranged on each retaining wall, a prefabricated panel is arranged on each concrete base, and foam light soil is poured between each prefabricated panel and each step; the prefabricated panel comprises a plurality of concrete panels, the concrete panels are stacked to form a wall surface, two adjacent concrete panels are respectively provided with embedded rings, one ends of the two adjacent embedded rings, which are far away from the concrete panels, are connected through connecting steel bars, one end of a pull rod is fixedly connected to one connecting steel bar, and the other end of the pull rod is fixedly connected to the other adjacent connecting steel bar; the angle steel stand passes concrete foundation and barricade and vertically sets up on the side slope road bed, and the inner wall and the angle steel stand fixed connection of the department of buckling of pull rod. The invention can reduce the land occupation caused by road slope releasing, effectively reduce the removal project and reduce the land acquisition and removal cost.

Description

High-speed foam light soil roadbed structure in mountain area

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of roadbed slope construction, in particular to a high-speed foam light soil roadbed structure in a mountainous area.

[ background of the invention ]

In roadbed construction, as the expressway in China starts later and the social economy continues to develop rapidly in recent years, the traffic volume of the expressway is increased rapidly, and part of the expressway built in early stage reaches or exceeds the designed traffic capacity. The reconstruction and the expansion of the expressway become a new hotspot of expressway construction career for more than ten years in the future. Land resources in China are relatively deficient, buildings near roads are dense, the removal difficulty is high, and the cost is high.

When the roadbed is steep, the anti-slide piles or the balance weight type road shoulder walls are generally adopted, but the anti-slide piles and the balance weight type road shoulder walls are high in construction cost, long in construction period and serious in environmental damage, so that the roadbed filling mode of retaining walls and foam soil is adopted, the roadbed filling can exceed 12m, and the stability is good.

[ summary of the invention ]

The invention aims to solve the problems and provides a high-speed foam light soil roadbed structure in a mountainous area.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a high-speed foam light soil roadbed structure in a mountainous area comprises steps arranged on a slope roadbed, wherein a retaining wall extending downwards is arranged at the lowest-level end part of each step, a concrete base is arranged on each retaining wall, a prefabricated panel is arranged on each concrete base, and foam light soil is poured between each prefabricated panel and each step;

the prefabricated panel comprises a plurality of concrete panels, angle steel pillars, pull rods, embedded rings and connecting steel bars, the concrete panels are stacked along the horizontal direction and the vertical direction to form a wall surface, the concrete panels are fixedly connected with one another, the embedded rings are respectively arranged on two adjacent concrete panels in the horizontal direction and the vertical direction, one ends, far away from the concrete panels, of the two adjacent embedded rings are connected through the connecting steel bars, the pull rods are bent pull rods, one ends of the pull rods are fixedly connected to one connecting steel bar, and the other ends of the pull rods are fixedly connected to the other adjacent connecting steel bar; the angle steel stand passes concrete pedestal and barricade are vertical to be set up on the side slope road bed, the inner wall of the department of buckling of pull rod with angle steel stand fixed connection, the angle steel stand with a plurality of concrete panels set up in opposite directions.

Further, the barricade orientation the step slope sets up, just the height of barricade is 2-8 meters.

Furtherly, each grade keep away from of step the one end of prefabricated panel all is equipped with the french drain, be equipped with the outlet on the barricade, bury the soft pipe of permeating water in the french drain underground, water in the french drain passes through the soft pipe of permeating water is followed the outlet is discharged.

Furthermore, the step upper berth is equipped with the metalling, the soft pipe of permeating water with between the metalling and all be equipped with the geotechnological cloth that permeates water on the metalling.

Furthermore, a reinforcing anchor rod is obliquely inserted into the vertical surface of the step, and mortar is poured between one end of the reinforcing anchor rod inserted into the step and the step.

Furthermore, a reinforcing mesh is laid between the prefabricated panel and the step, and the foamed light soil is poured on the reinforcing mesh.

Further, an installation notch is formed in the concrete base, and one end of the prefabricated panel is fixed in the installation notch.

Further, the foamed light soil is prepared from the following components in parts by weight: 150-200 parts of cement, 20-50 parts of diatomite, 10-20 parts of a water reducing agent, 6-12 parts of a foaming agent, 5-20 parts of synthetic fiber and 100-200 parts of water;

the foaming agent is prepared from lauryl sodium sulfate, a rosin soap foaming agent and a diatomite modifier according to the weight ratio of 60-70:20-30: 7-12.

Further, the preparation method of the diatomite modifier comprises the following steps:

(1) adding cellulase into the waste paper, stirring for 2-3 hours, centrifuging to obtain supernatant, adding light calcium carbonate solution, heating to 45-55 ℃, and stirring uniformly to obtain modified paper pulp; wherein the mass ratio of the cellulase to the waste paper is 1: 0.005-0.01; the mass concentration of the light calcium carbonate solution is 0.05-0.1%, and the solid-to-liquid ratio of the waste paper to the light calcium carbonate solution is 1: 1.5-3;

(2) dissolving 2-10 parts of dodecyl trimethyl ammonium bromide in 20-60 parts of water to obtain a dodecyl trimethyl ammonium bromide solution; mixing a decaalkyl trimethyl ammonium bromide solution and diatomite according to a mass ratio of 1:0.5-0.8, stirring for 1-3 hours, then transferring into a reaction kettle, heating in a water bath at 80-100 ℃ for 6-8 hours, and drying after completion to obtain a dried substance; then the dried material is placed in a muffle furnace at the temperature of 450-550 ℃ for calcination for 1-2 hours; obtaining modified diatomite;

(3) and mixing the modified paper pulp liquid and the modified diatomite according to the weight ratio of 1:3-6, and uniformly stirring to obtain the diatomite modifier.

Further, the synthetic fiber is a mixture of two or more of polyethylene, polypropylene and polyvinyl alcohol.

By adopting the technical scheme, the invention has the beneficial effects that:

(1) when the foam light soil is applied to a road line passing through a steep section of a mountain area, the advantages of the foam light soil are adopted, the self-force is solidified, the problems of high slope support cost and damage to the environment caused by high-fill high-cut are solved, the filling load is reduced, the friction force of the foam light soil on the mountain body can be increased by adopting a stepped mode, a better engagement effect can be achieved, and the stability is ensured. Meanwhile, the prefabricated panels are vertically arranged, and the foam light soil with good standing property is poured between the prefabricated panels and the steps, so that the hanging plate vertical type foam light soil embankment is adopted, the land occupation caused by road slope releasing can be reduced, the removal project is effectively reduced, and the land acquisition and removal cost is reduced. And the volume weight of the foamed light soil is about 1/3-1/2 of common soil, so that the filling load can be greatly reduced, the additional stress of the foundation can be reduced, the settlement of the roadbed after construction can be effectively controlled, and the generation of longitudinal crack diseases can be avoided.

(2) The prefabricated panel comprises a plurality of concrete panels, angle steel pillars, pull rods, embedded rings and connecting steel bars, the plurality of concrete panels and the angle steel pillars can be fixedly connected through the embedded rings, the connecting steel bars and the pull rods, and the angle steel pillars penetrate through the concrete base and the retaining wall and are vertically arranged on the slope subgrade, so that the prefabricated panel can be stably fixed on the slope subgrade and has good stress performance.

(3) The foaming agent used in the preparation process of the foamed lightweight soil is prepared from sodium dodecyl sulfate, a rosin soap foaming agent and a kieselguhr modifier according to a certain weight ratio, the kieselguhr modifier is prepared from modified pulp liquid and modified kieselguhr, and the obtained modified pulp liquid has better foaming capacity by degrading waste paper with cellulase and treating with a light calcium carbonate solution; the foaming agent provided by the invention has the advantages that the porosity, the wear resistance and the strength of the diatomite are improved by modifying the diatomite, the modified pulp liquid and the modified diatomite are mixed, the foaming capacity of the modified pulp liquid is utilized, the high porosity and the high wear resistance of the modified diatomite are combined, the diatomite modifier which is good in foaming and high in strength is obtained, finally the diatomite modifier is mixed with sodium dodecyl sulfate and a rosin soap foaming agent according to a certain weight ratio, and the foaming performance of the foaming agent is further improved by the sodium dodecyl sulfate and the rosin soap foaming agent, so that the foaming agent provided by the invention has good foaming performance, high wear resistance and high strength, and the obtained foamed lightweight soil has the advantages of light weight and high strength.

[ description of the drawings ]

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of a prefabricated panel of the present invention;

FIG. 3 is a top view of a prefabricated panel according to the present invention;

FIG. 4 is a front view of a concrete panel according to the present invention;

fig. 5 is a cross-sectional view of the blind groove in the step of the present invention.

In the figure, 1-concrete foundation, 2-angle steel upright post, 3-installation notch, 4-concrete panel, 5-prefabricated panel, 6-pull rod, 7-connecting steel bar, 8-embedded ring, 9-wire netting, 10-step, 11-retaining wall, 12-foam light soil, 13-blind ditch, 131-soft permeable pipe, 14-gravel layer, 15-permeable geotextile, 16-reinforced anchor rod, 17-supporting steel plate, 18-guide plate, 19-rotating sleeve, 20-sphere, 21-hanging ring, 22-hanging hook and 23-reinforcing mesh.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Examples

Referring to fig. 1 to 5, a high-speed foam lightweight roadbed structure in a mountain area comprises steps 10 arranged on a slope roadbed, a retaining wall 11 extending downwards is arranged at the lowest end of each step 10, a concrete base 1 is arranged on each retaining wall 11, a prefabricated panel 5 arranged vertically is arranged on each concrete base 1, in this embodiment, an installation notch 3 is further formed in each concrete base 1, and one end of each prefabricated panel 5 is fixed in each installation notch 3 through cement mortar. Foam light soil 12 is poured between the prefabricated panel 5 and the step 10, and the foam light soil has the advantages of light weight, high strength (unconfined compressive strength can be adjusted within the range of 0.3-5 MPa), good standing property after curing, good fluidity, no need of vibration and compaction, short construction period, small interference, convenience in construction and the like. And the volume weight of the foamed light soil is about 1/3-1/2 of common soil, so that the filling load can be greatly reduced, the additional stress of a foundation can be reduced, the settlement of the roadbed after construction can be effectively controlled, and the generation of longitudinal crack diseases can be avoided. Because the prefabricated panels 5 are vertically arranged, the hanging plate vertical type foam light soil embankment is adopted, the occupied land due to road slope releasing can be reduced, the removal engineering is effectively reduced, and the land acquisition and removal cost is reduced.

The prefabricated panel 5 comprises a plurality of concrete panels 4, angle steel struts 2, pull rods 6, embedded rings 8 and connecting steel bars 7, the concrete panels 4 are piled up along the horizontal direction and the vertical direction to form a wall surface, the concrete panels 4 are fixedly connected through cement mortar, the two adjacent concrete panels 4 in the horizontal direction and the vertical direction are respectively provided with the embedded ring 8, the open ends of the embedded rings 8 are fixedly connected with the wire netting 9 in the concrete panel 4, one end (i.e. a non-open end) of each two adjacent embedded rings 8 far away from the concrete panel 4 is connected in pairs through the connecting steel bars 7, the pull rod 6 is a bent pull rod, one end of the pull rod 6 is fixedly connected to one connecting steel bar 7, and the other end of the pull rod 6 is fixedly connected to the other adjacent connecting steel bar 7; angle steel stand 2 passes concrete foundation 1 and 11 vertical settings of barricade are on the side slope road bed, the inner wall of the department of buckling of pull rod 6 with angle steel stand 2 fixed connection, angle steel stand 2 with the setting in opposite directions of a plurality of concrete panels 4. Can make a plurality of concrete panels 4 and angle steel pillar 2 fixed connection through pre-buried ring 8, connecting reinforcement 7 and pull rod 6, because angle steel stand 2 passes concrete foundation 1 and barricade 11 are vertical to be set up on the side slope road bed, finally make prefabricated panel 5 can stabilize on the side slope road bed to have good atress performance.

Further, the retaining wall 11 is inclined towards the step 10, and the height of the retaining wall 11 is 2-8 meters. The retaining wall 11 is obliquely arranged, so that the retaining wall is better stressed, and the stability of the invention is further improved.

Further, each grade keep away from of step 10 the one end of prefabricated panel 5 all is equipped with the french drain 13, be equipped with the outlet on the barricade 11, bury soft pipe 131 of permeating water in the french drain 13 underground, water in the french drain 13 passes through soft pipe 131 of permeating water is followed the outlet is discharged. The blind ditches 13 and the soft permeable pipes 131 are beneficial to the drainage of the roadbed, and the stability and the practicability of the roadbed are improved.

Further, a gravel layer 14 is laid on the step 10, and a permeable geotextile 15 is arranged between the soft permeable pipe 131 and the gravel layer 14 and on the gravel layer 14. The arrangement of the permeable geotextile 15 can prevent water from accumulating on the step 10, so that water flows into the blind ditch through the soft permeable pipe 131, soil particles, fine sand, small stones and the like can be effectively intercepted, and the stability of the invention is improved.

Furthermore, a reinforcing anchor rod 16 is obliquely inserted into the vertical surface of the step 10, mortar is poured between one end of the reinforcing anchor rod 16 inserted into the step 10 and the step 10, and the stability of the step is further improved.

Furthermore, a reinforcing mesh 23 is laid between the prefabricated panel 5 and the step 10 in a layered manner, and the foamed lightweight soil 12 is poured on the reinforcing mesh 23 in a layered manner. The layered pouring of the foamed light soil 12 can ensure that the foamed light soil 12 at the bottom also has good compactness and strength. When pouring, the foamed light soil is constructed by adopting a high-pressure hose for pumping, is self-leveling and self-compacting, does not need mechanical rolling and vibrating, is convenient and efficient to construct, short in construction period, controllable in safety and quality, free of pollution to the environment and good in social benefit.

Further, the foamed light soil 12 may be made of the following components in parts by weight: 150-200 parts of cement, 20-50 parts of diatomite, 10-20 parts of a water reducing agent, 6-12 parts of a foaming agent, 5-20 parts of synthetic fiber and 100-200 parts of water; the foamed light soil 12 in this embodiment is preferably prepared from the following components in parts by weight: 180 parts of cement, 30 parts of diatomite, 15 parts of a water reducing agent, 10 parts of a foaming agent, 10 parts of synthetic fiber and 160 parts of water.

The foaming agent can be prepared from lauryl sodium sulfate, rosin soap foaming agent and diatomite modifier according to the weight ratio of 60-70:20-30: 7-12. In this embodiment, the foaming agent is preferably prepared from sodium dodecyl sulfate, rosin soap foaming agent and diatomite modifier according to the weight ratio of 65:25:10

Further, the preparation method of the diatomite modifier comprises the following steps:

(1) adding cellulase into the waste paper, stirring for 3 hours, centrifuging to obtain supernatant, adding light calcium carbonate solution, heating to 50 ℃, and stirring uniformly to obtain modified paper pulp; wherein the mass ratio of the cellulase to the waste paper is 1: 0.008; the mass concentration of the light calcium carbonate solution is 0.06%, and the solid-to-liquid ratio of the waste paper to the light calcium carbonate solution is 1: 2.5;

(2) dissolving 6 parts of dodecyl trimethyl ammonium bromide in 50 parts of water to obtain a dodecyl trimethyl ammonium bromide solution; mixing a decaalkyl trimethyl ammonium bromide solution and diatomite according to a mass ratio of 1:0.6, stirring for 2 hours, then transferring into a reaction kettle, heating in a water bath at 90 ℃ for 7 hours, and drying after the heating to obtain a dried substance; then placing the dried substance in a muffle furnace at 500 ℃ for calcining for 2 hours; obtaining modified diatomite;

(3) and (3) mixing the modified paper pulp liquid and the modified diatomite in a weight ratio of 1:4.5, and uniformly stirring to obtain the diatomite modifier.

The water reducing agent is a mixture of two or more of polyethylene, polypropylene and polyvinyl alcohol, and in this embodiment, the mixture of polyethylene and polyvinyl alcohol in a weight ratio of 1:1 is preferred.

The construction method of the roadbed structure mainly comprises the steps of excavating a slope roadbed, paving a broken stone cushion layer, arranging a panel and a foundation, pouring bubble light soil, paving a geomembrane, paving a road surface and the like.

(1) Dividing a construction area: before construction, the division of a pouring area and a pouring layer is carried out on the designed pouring body by combining equipment production capacity, construction period requirements and the like, and relevant planning is made for pouring construction,

(2) and (3) excavating a roadbed: and excavating the roadbed according to a design drawing, and excavating the step 10, wherein the height and the width of the step 10 are more than 1.5 m.

(3) Laying a retaining wall: removing sundries on the foundation of the pouring area to ensure that the foundation has no accumulated water or soft soil, carrying out necessary rolling treatment on the foundation soil layer, wherein the compaction degree is not lower than 80%, and paving a retaining wall on the foundation.

(4) Setting panel and foundation

And (3) processing a concrete panel 4, wherein the concrete panel 4 is formed by pouring C25 concrete by a steel wire mesh 9 and an embedded ring 8, pouring the concrete base 1 and additionally arranging a template, and processing the prefabricated panel 5 to ensure that the pull rod 6 and the concrete panel 4 are fixed and connected with the angle steel upright post 2.

(5) Foam generation

The foam is generated by a foaming machine by compressing air after being diluted by a foaming agent. Before foaming, the foaming agent is metered and then diluted by adding water to prepare a water diluent, and the original foaming liquid can not be directly added into a foaming machine for foaming.

(6) Preparation of cement slurries

The cement slurry is supplied by the mixing station in a centralized way, and the mixing station is suitable for adopting flow and not adopting weight for water metering so as to accelerate the preparation time of the cement slurry. The foamed light soil has no special requirement on the strength of cement in cement paste, but the cement used must be subjected to a defoaming test. The preparation of the cement paste is continuous, and the phenomena of local defoaming and initial setting in the light soil pouring process are avoided, so that the overall construction quality is not influenced. The cement paste is further stirred on site to ensure uniformity and no deposition, and a filter screen is arranged at a discharge port to prevent large granular materials from blocking a pump pipe.

In the construction process, each car of cement paste is subjected to severe detection, so that the stable quality of the cement paste is ensured.

(7) Foamed light soil formation

The foamed light soil is prepared by mixing a bubble agent, diatomite, synthetic fibers, cement paste and the like, and production parameters need to be adjusted after a machine is started every time in the construction process so as to ensure that the wet density and the flow of the light soil meet the design requirements.

(8) Cast in place

① the single layer pouring thickness of the foam light soil is controlled in the range of 0.5 m-1.0 m, the upper and lower adjacent pouring layers in the same section are controlled, when the temperature is not lower than 15 ℃ in the construction period, the shortest pouring interval time can be controlled according to 8-12 hours, otherwise, the pouring interval time is not lower than 2 days;

② the partition form is firmly installed, and the pouring region should be sealed with plastic cloth to prevent the foam light soil from seeping along the gap.

③ the pouring time of the single pouring area and the pouring layer of the foam lightweight soil is controlled within the initial setting time of cement paste, and the upper pouring layer can be poured and constructed only after the final setting of the lower pouring layer.

④ should be poured from one end to the other as far as possible along the long axis of the pouring zone, if more than one pouring tube is used, the pouring can be started side by side from one end, or in a diagonal pouring manner.

⑤ in the casting process, when the casting tube needs to be moved, it should move back and forth along the direction of the casting tube, but it is not suitable to move the casting tube left and right, if it really needs to move the casting tube left and right, it should be moved after lifting the surface of the light soil as far as possible.

⑥ the pouring gate should be kept as horizontal as possible and as low as possible from the surface of the currently poured lightweight earth when the surface is swept.

⑦ minimize walking back and forth through the poured, uncured lightweight earth.

(9) Finished product protection

And after each layer is poured, a plastic film is adopted for covering, moisturizing and maintaining. And after the last layer is poured, the curing age is not less than 7 days.

The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.

Claims (10)

1. The high-speed foam light soil roadbed structure in the mountainous area is characterized by comprising steps arranged on a slope roadbed, wherein a retaining wall extending downwards is arranged at the lowest-level end part of each step, a concrete base is arranged on each retaining wall, a prefabricated panel is arranged on each concrete base, and foam light soil is poured between each prefabricated panel and each step;

the prefabricated panel comprises a plurality of concrete panels, angle steel pillars, pull rods, embedded rings and connecting steel bars, the concrete panels are stacked along the horizontal direction and the vertical direction to form a wall surface, the concrete panels are fixedly connected with one another, the embedded rings are respectively arranged on two adjacent concrete panels in the horizontal direction and the vertical direction, one ends, far away from the concrete panels, of the two adjacent embedded rings are connected through the connecting steel bars, the pull rods are bent pull rods, one ends of the pull rods are fixedly connected to one connecting steel bar, and the other ends of the pull rods are fixedly connected to the other adjacent connecting steel bar; the angle steel stand passes concrete pedestal and barricade are vertical to be set up on the side slope road bed, the inner wall of the department of buckling of pull rod with angle steel stand fixed connection, the angle steel stand with a plurality of concrete panels set up in opposite directions.

2. The mountain area high-speed foam light soil roadbed structure of claim 1, wherein the retaining wall is arranged obliquely towards the step, and the height of the retaining wall is 2-8 m.

3. The mountain high-speed foamed light soil roadbed structure as claimed in claim 1, wherein one end of each step away from the prefabricated panel is provided with a blind ditch, the retaining wall is provided with a drainage hole, a soft water-permeable pipe is embedded in the blind ditch, and water in the blind ditch is drained from the drainage hole through the soft water-permeable pipe.

4. The mountain area high-speed foam light soil roadbed structure of claim 3, wherein a gravel layer is laid on the step, and a water-permeable geotextile is arranged between the soft water-permeable pipe and the gravel layer and on the gravel layer.

5. The mountain high-speed foam light soil roadbed structure of claim 1, wherein a steel bar net is laid between the prefabricated panel and the step, and the foam light soil is poured on the steel bar net.

6. The mountain area high-speed foam light soil roadbed structure as claimed in claim 5, wherein a reinforcing anchor rod is obliquely inserted on the vertical surface of the step, and mortar is poured between one end of the reinforcing anchor rod inserted into the step and the step.

7. The mountain area high-speed foam light soil roadbed structure of claim 5, wherein the concrete base is further provided with an installation notch, and one end of the prefabricated panel is fixed in the installation notch.

8. The mountain area high-speed foam light soil roadbed structure of claim 1, wherein the foam light soil is prepared from the following components in parts by weight: 150-200 parts of cement, 20-50 parts of diatomite, 10-20 parts of a water reducing agent, 6-12 parts of a foaming agent, 5-20 parts of synthetic fiber and 100-200 parts of water;

the foaming agent is prepared from lauryl sodium sulfate, a rosin soap foaming agent and a diatomite modifier according to the weight ratio of 60-70:20-30: 7-12.

9. The mountain area high-speed foam light soil roadbed structure of claim 8, wherein the diatomite modifier is prepared by the following steps:

(1) adding cellulase into the waste paper, stirring for 2-3 hours, centrifuging to obtain supernatant, adding light calcium carbonate solution, heating to 45-55 ℃, and stirring uniformly to obtain modified paper pulp; wherein the mass ratio of the cellulase to the waste paper is 1: 0.005-0.01; the mass concentration of the light calcium carbonate solution is 0.05-0.1%, and the solid-to-liquid ratio of the waste paper to the light calcium carbonate solution is 1: 1.5-3;

(2) dissolving 2-10 parts of dodecyl trimethyl ammonium bromide in 20-60 parts of water to obtain a dodecyl trimethyl ammonium bromide solution; mixing a decaalkyl trimethyl ammonium bromide solution and diatomite according to a mass ratio of 1:0.5-0.8, stirring for 1-3 hours, then transferring into a reaction kettle, heating in a water bath at 80-100 ℃ for 6-8 hours, and drying after completion to obtain a dried substance; then the dried material is placed in a muffle furnace at the temperature of 450-550 ℃ for calcination for 1-2 hours; obtaining modified diatomite;

(3) and mixing the modified paper pulp liquid and the modified diatomite according to the weight ratio of 1:3-6, and uniformly stirring to obtain the diatomite modifier.

10. The mountain area high speed foam light weight subgrade structure of claim 8, wherein said synthetic fibers are a mixture of two or more of polyethylene, polypropylene and polyvinyl alcohol.

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