Sandy silt subgrade filling construction method and application thereof

Abstract

The The invention relates to the technical field of subgrade engineering, and particularly discloses a sandy silt subgrade filling construction method and application thereof. According to the sandy silt subgrade filling construction method, sandy silt doped with a curing agent serves as a subgrade, the CBR strength of the subgrade can greatly meet the construction requirement after the subgrade is fully compacted under the optimal water content, and theunconfined compressive strength is effectively improved. Meanwhile, the curing agent can generate more gel substances, so that soil sample particles are more compact, the strength and the stability of a cured soil body are greatly improved, the volume shrinkage in the freezing and thawing process is effectively reduced, the phenomena of local pulverization and peeling and corner falling of the soil sample are improved, and then the freezing and thawing cycle resistance can be effectively improved; and the problem that an existing sandy silt subgrade filling construction method cannot effectively improve the freeze-thaw cycle resistance of a sandy silt subgrade is solved, and wide market prospects are achieved.

Description

technical field

[0001] The invention relates to the technical field of roadbed engineering, in particular to a sandy silt roadbed filling construction method and its application. Background technique

[0002] Silt refers to the soil whose particle size is greater than 0.075mm and the mass of particles does not exceed 50% of the total mass, and the plasticity index is less than or equal to 10. Silt is widely distributed and its properties are between sand and clay. According to the clay content, silt can be divided into sandy silt and clayey silt. Due to the large content of silt in silt, it has the characteristics of low plasticity, low strength, and low saturated moisture content. Silt roadbeds are especially sandy. The silt subgrade is easily damaged by frost heave or slurry due to the influence of capillary water, which affects the life of the road. At the same time, the liquefaction of silt has great harm to the ground buildings.

[0003] At present, sandy silt is the ...

Examples

preparation example Construction

[0047] As another preferred embodiment of the present invention, the preparation method of the curing agent comprises the following steps:

[0048] 1) Mix triethanolamine, silicone wetting and dispersing agent, sodium metaaluminate, retarder and part of water to obtain primary mixture;

[0049] 2) mixing the primary mixture obtained in step 1) with water glass to obtain a premix;

[0050] 3) Mix the premixed material obtained in the step 2) with the curing material and the remaining part of water, and carry out a metathesis reaction to obtain a curing agent.

[0051] As another preferred embodiment of the present invention, in the preparation method of the curing agent, based on the total amount of water being 35-55 parts by weight, the part of water in the step 1) is 15-20 parts by weight.

[0052] Preferably, the preparation method of described curing agent comprises the following steps:

[0053] 1) In parts by weight, mix 2 parts of triethanolamine, 0.5 parts of IOTA245, ...

Embodiment 1

[0060] A sandy silt subgrade filling construction method, specifically a method of using an AT curing agent for solidifying sandy silt to carry out subgrade filling construction, refer to figure 1 , which includes the following steps:

[0061] Step 1: Level and fill the earthwork in the construction area where the roadbed filling construction is to be carried out, and clean up the weeds, garbage and other sundries in the construction area of ​​the roadbed.

[0062] Step 2: Measure the moisture content of the sandy silt (roadbed filler) to be filled into the construction area, and compact the silt according to the compaction test plan in T0131-2006 of "JTG3430-2020 Highway Soil Test Regulations" In the experiment, for each moisture content, three groups of parallel experiments were carried out, and finally the moisture content-dry density relationship curve was drawn to determine the optimum moisture content.

[0063] Step 3: Water content control, observe whether the sandy si...

Embodiment 2

[0077] Referring to the sandy silt subgrade filling construction method in Example 1, the dosage of AT curing agent (modulus 3.3) is set to (calculated according to mass percentage) 0%, 1%, 3%, and 5% respectively , 7%, 9%, and make samples with different compaction degrees (respectively 94%, 95%, 96% and 98%), and then conduct the unconfined compressive strength test, the specific unconfined compressive strength See the test results figure 2 As shown, among them, three groups of parallel tests were carried out according to the requirements of the specification, and the optimum moisture content was 11.4%, and the maximum dry density was 1.873g / cm 3 , that is, a sample with a mass of 205 g is considered to have reached the relative maximum degree of compaction. The preparation method of the unconfined compressive strength sample is carried out in accordance with the provisions of the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials (JTG E51-2009)" i...

technical field

[0001] The invention relates to the technical field of roadbed engineering, in particular to a sandy silt roadbed filling construction method and its application. Background technique

[0002] Silt refers to the soil whose particle size is greater than 0.075mm and the mass of particles does not exceed 50% of the total mass, and the plasticity index is less than or equal to 10. Silt is widely distributed and its properties are between sand and clay. According to the clay content, silt can be divided into sandy silt and clayey silt. Due to the large content of silt in silt, it has the characteristics of low plasticity, low strength, and low saturated moisture content. Silt roadbeds are especially sandy. The silt subgrade is easily damaged by frost heave or slurry due to the influence of capillary water, which affects the life of the road. At the same time, the liquefaction of silt has great harm to the ground buildings.

[0003] At present, sandy silt is the ...

Examples

preparation example Construction

[0047] As another preferred embodiment of the present invention, the preparation method of the curing agent comprises the following steps:

[0048] 1) Mix triethanolamine, silicone wetting and dispersing agent, sodium metaaluminate, retarder and part of water to obtain primary mixture;

[0049] 2) mixing the primary mixture obtained in step 1) with water glass to obtain a premix;

[0050] 3) Mix the premixed material obtained in the step 2) with the curing material and the remaining part of water, and carry out a metathesis reaction to obtain a curing agent.

[0051] As another preferred embodiment of the present invention, in the preparation method of the curing agent, based on the total amount of water being 35-55 parts by weight, the part of water in the step 1) is 15-20 parts by weight.

[0052] Preferably, the preparation method of described curing agent comprises the following steps:

[0053] 1) In parts by weight, mix 2 parts of triethanolamine, 0.5 parts of IOTA245, ...

Embodiment 1

[0060] A sandy silt subgrade filling construction method, specifically a method of using an AT curing agent for solidifying sandy silt to carry out subgrade filling construction, refer to figure 1 , which includes the following steps:

[0061] Step 1: Level and fill the earthwork in the construction area where the roadbed filling construction is to be carried out, and clean up the weeds, garbage and other sundries in the construction area of ​​the roadbed.

[0062] Step 2: Measure the moisture content of the sandy silt (roadbed filler) to be filled into the construction area, and compact the silt according to the compaction test plan in T0131-2006 of "JTG3430-2020 Highway Soil Test Regulations" In the experiment, for each moisture content, three groups of parallel experiments were carried out, and finally the moisture content-dry density relationship curve was drawn to determine the optimum moisture content.

[0063] Step 3: Water content control, observe whether the sandy si...

Embodiment 2

[0077] Referring to the sandy silt subgrade filling construction method in Example 1, the dosage of AT curing agent (modulus 3.3) is set to (calculated according to mass percentage) 0%, 1%, 3%, and 5% respectively , 7%, 9%, and make samples with different compaction degrees (respectively 94%, 95%, 96% and 98%), and then conduct the unconfined compressive strength test, the specific unconfined compressive strength See the test results figure 2 As shown, among them, three groups of parallel tests were carried out according to the requirements of the specification, and the optimum moisture content was 11.4%, and the maximum dry density was 1.873g / cm 3 , that is, a sample with a mass of 205 g is considered to have reached the relative maximum degree of compaction. The preparation method of the unconfined compressive strength sample is carried out in accordance with the provisions of the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials (JTG E51-2009)" i...

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