Collapsible loess foundation treatment method

Abstract

The invention provides a treatment method for a collapsible loess foundation, and relates to the technical field of loess foundations. The collapsible loess foundation treatment method comprises the following steps that firstly, a foundation site before pile body construction is detected, and the physical and mechanical characteristics of an undisturbed soil foundation before foundation treatment are obtained; then carrying out crushing treatment on the coal gangue; adding quick lime, sodium hydroxide and water glass into the crushed coal gangue, and uniformly mixing to obtain a mixed filler; the mixed filler is used as pile hole filler for filling, so that multiple groups of lime-soil piles made of the coal gangue regenerated material are manufactured; and finally, detecting the action effect of the pile body after the construction of the lime-soil pile body made of the coal gangue regenerated material is completed, detecting the lime-soil compaction pile in the area section, and comparing and analyzing the action effect of the lime-soil pile made of the coal gangue regenerated material with the action effect of the lime-soil compaction pile in the area section. According to the method, coal gangue resources in the loess area are fully utilized to reinforce the collapsible loess foundation, the reinforcement cost is reduced, and meanwhile the overall supporting strength of the prepared coal gangue regenerated material lime-soil pile is the same as that of a lime-soil compaction pile.

Description

Technical Field

[0001] The invention provides a method for processing a collapsible loess foundation, belonging to the technical field of loess foundations. Background Art

[0002] Collapsible loess is natural loess that is under certain pressure and soaked in water. The loess structure is severely damaged, and significant collapsible deformation occurs, and the strength is reduced. Collapsible loess foundations will collapse unevenly when they come into contact with water, causing hazards such as tilting of buildings, serious damage to walls, cracking of load-bearing structures, and sinking of foundations. Therefore, it is necessary to treat collapsible loess foundations.

[0003] The purpose of collapsible loess foundation treatment is to eliminate the collapsibility of loess and improve the bearing capacity of loess foundation. At present, the treatment methods of collapsible loess foundation mainly include the following:

[0004] (1) Cushion method

[0005] The cushion method is also called the excavation replacement method or the soil replacement cushion method. This method is to completely or partially remove the collapsible loess under the base, and then use plain soil or gray soil to compact it layer by layer as a cushion to eliminate part or all of the collapse of the foundation, reduce the compression deformation and seepage deformation of the foundation, and improve the bearing capacity of the foundation. The cushion method has the disadvantages of being difficult to operate and high cost. At the same time, the quality of the cushion construction must be inspected layer by layer, and the upper soil should be laid after the compaction coefficient of each layer meets the design requirements.

[0006] (2) Compacting method

[0007] The compaction method uses the impact energy of the free fall of a heavy hammer to compact the foundation, including heavy compaction and strong compaction. This method is only suitable for treating collapsible loess with a saturation of less than 60%. At the same time, the compaction method also has technical defects such as high processing cost and long processing cycle.

[0008] (3) Compaction pile method

[0009] The compaction pile method is suitable for treating collapsible loess foundations above the groundwater level. It can be used for local treatment of the foundation or for the entire piece. This method uses machinery, manpower or blasting to make holes, fills them with soil or lime soil with the optimal moisture content and compacts them layer by layer. The compaction coefficient must not be less than 0.93 to form soil or lime soil piles to achieve the purpose of strengthening the foundation. This method has the technical difficulties of large engineering workload and difficulty in meeting design requirements.

[0010] (4) Pre-immersion method

[0011] The pre-soaking method is to soak the collapsible loess in water over a large area before the construction of the building, so that the soil will collapse under the saturated self-weight pressure and produce compaction, so as to eliminate the self-weight collapsibility of all loess layers below 4m to 5m from the ground surface. This method has large water consumption, long construction period, and can only be used in areas with sufficient water sources, which has great applicability limitations.

[0012] (5) Chemical reinforcement method

[0013] The chemical reinforcement method is to inject sodium silicate, sodium hydroxide and other substances into the loess, which react with the loess to form gel, thereby transforming the loose structure of the loess into an integral structure, achieving tight stacking, improving the strength of the soil, and reducing the permeability of the soil. Although chemical reinforcement can currently use a variety of different chemical materials for reinforcement, the effect of improved polymer materials is far higher than that of traditional inorganic chemical materials. The reinforcement cost of improved polymer materials is high, making it difficult to achieve practical promotion and application.

[0014] The Loess region is rich in coal resources, and coal mining will produce a large amount of coal gangue. Using coal gangue to reinforce the collapsible loess foundation can not only realize the resource utilization of coal gangue, but also reduce the cost of reinforcement treatment, and has a high market application prospect. Summary of the invention

[0015] In view of this, the purpose of the present invention is to provide a method for treating collapsible loess foundation. The method uses coal gangue as raw material and a certain amount of quicklime, sodium hydroxide and water glass as pile fillers, which can effectively reduce the reinforcement cost of collapsible loess foundation and improve the reinforcement effect.

[0016] The present invention is specifically implemented by adopting the following technical solutions:

[0017] A method for treating collapsible loess foundation comprises the following steps:

[0018] Step 1: Test the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment;

[0019] Step 2: crushing the coal gangue;

[0020] Step 3: adding quicklime, sodium hydroxide and water glass to the crushed coal gangue and mixing them evenly to obtain a mixed filler;

[0021] Step 4: Filling the pile hole with the mixed filler to produce multiple groups of coal gangue recycled material ash soil piles;

[0022] Step 5: After the construction of the gangue recycled material ash-soil pile body is completed, the effect of the pile body is tested, and the ash-soil compaction piles in the area are tested at the same time, and the effects of the gangue recycled material ash-soil piles and the ash-soil compaction piles in the area are compared and analyzed.

[0023] Preferably, step 1 is to determine the locations of three exploration wells evenly within the scope of the construction site based on the on-site investigation report data, determine the exploration well depth to be 6m according to the original designed pile length, take a soil sample every 1m within the sampling depth, a total of 3 groups, and finally take a total of 18 samples, number the soil samples, bring the soil samples back, and conduct indoor tests to obtain the physical indicators of the moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity of the original soil, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site. Further preferably, it is also necessary to determine the mechanical indicators of the original soil such as the collapsibility coefficient, compression coefficient a, and compression modulus Es.

[0024] Preferably, the method for crushing the coal gangue in step 2 comprises the following steps:

[0025] (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh;

[0026] (2) heat treating the powder at 600-800° C. for 2-3 hours under an inert atmosphere;

[0027] (3) Cooling the heat-treated material to room temperature;

[0028] (4) Crush the cooled powder and pass it through a 200-300 mesh sieve.

[0029] Preferably, the mass percentage of quicklime in the mixed filler is 3-5%; the mass percentage of sodium hydroxide in the mixed filler is 1-5%; and the mass percentage of water glass in the mixed filler is 10%-15%.

[0030] Preferably, the specific construction method of the coal gangue recycled material lime soil pile in step 4 is as follows:

[0031] A diesel hammer is used to impact the hole. During the construction, a pile driver is used to drive a steel pipe into the soil. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is completed, the steel pipe is slowly pulled out. When the bottom of the hole has reached the effective depth, the filling operation can be carried out. More preferably, the diameter of the rammer used in the present invention is 200mm-400mm, the mass is 1 ton-1.5 tons, and the number of ramming times for each layer of filler is 6-8.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention provides a method for reinforcing a collapsible loess foundation, which makes full use of the gangue resources in the loess area to reinforce the collapsible loess foundation, thereby reducing the reinforcement cost. At the same time, the overall supporting strength of the gangue recycled material lime-soil pile prepared by the present invention is the same as that of the lime-soil compaction pile. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention clearer, the preferred embodiments of the present invention are further described in detail in conjunction with the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] A method for treating collapsible loess foundation, the specific steps are as follows:

[0037] Step 1: Detect the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment; specifically, the present invention is based on the on-site investigation report data, and evenly determines the positions of 3 exploration wells within the construction site. The exploration well depth is determined to be 6m according to the original design pile length. A soil sample is taken every 1m within the sampling depth, for a total of 3 groups, and finally a total of 18 samples are taken. The soil samples are numbered and brought back. Through indoor tests, the physical indicators of moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity ratio of the original soil are obtained. At the same time, it is also necessary to measure the mechanical indicators of the collapsibility coefficient, compression coefficient a, and compression modulus Es of the original soil, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site.

[0038] Step 2: crush the coal gangue; the specific steps are as follows:

[0039] (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh;

[0040] (2) heat treating the powder at 800° C. for 2 h under an inert atmosphere;

[0041] (3) Cooling the heat-treated material to room temperature;

[0042] (4) Crush the cooled powder and pass it through a 200-mesh sieve.

[0043] Step 3: Add quicklime, sodium hydroxide and water glass to the crushed coal gangue and mix them evenly to obtain a mixed filler; the mass percentage of quicklime in the mixed filler of the present invention is 5%; the mass percentage of sodium hydroxide in the mixed filler is 1%; the mass percentage of water glass in the mixed filler is 10%.

[0044] Step 4: Fill the pile hole with the mixed filler to make multiple groups of coal gangue recycled material ash soil piles; specifically, the present invention uses a diesel hammer to impact the hole, and a pile driver is used to drive a steel pipe into the soil during construction. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is formed, the steel pipe is slowly pulled up. When the bottom of the hole has reached the effective depth, the filling operation can be carried out. The rammer used in the present invention has a diameter of 400mm and a mass of 1 ton. The number of ramming times for each layer of filler is 8.

[0045] Step 5: After the gangue recycled material lime-soil pile is constructed, the pile effect is tested, and the lime-soil compaction piles in the area are tested, and the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles in the area are compared and analyzed. There is no significant difference in the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles of the present invention.

[0046] Example 2

[0047] A method for treating collapsible loess foundation, the specific steps are as follows:

[0048] Step 1: Detect the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment; specifically, the present invention is based on the on-site investigation report data, and evenly determines the positions of 3 exploration wells within the construction site. The exploration well depth is determined to be 6m according to the original design pile length. A soil sample is taken every 1m within the sampling depth, for a total of 3 groups, and finally a total of 18 samples are taken. The soil samples are numbered and brought back. Through indoor tests, the physical indicators of the moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity of the original soil are obtained. At the same time, it is also necessary to measure the mechanical indicators of the collapsibility coefficient, compression coefficient a, and compression modulus Es of the original soil, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site.

[0049] Step 2: crush the coal gangue; the specific steps are as follows:

[0050] (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh;

[0051] (2) heat treating the powder at 700° C. for 2 h under an inert atmosphere;

[0052] (3) Cooling the heat-treated material to room temperature;

[0053] (4) Crush the cooled powder and pass it through a 300-mesh sieve.

[0054] Step 3: Add quicklime, sodium hydroxide and water glass to the crushed coal gangue and mix them evenly to obtain a mixed filler; the mass percentage of quicklime in the mixed filler of the present invention is 5%; the mass percentage of sodium hydroxide in the mixed filler is 1%; the mass percentage of water glass in the mixed filler is 10%.

[0055] Step 4: Fill the pile hole with the mixed filler to make multiple groups of coal gangue recycled material ash soil piles; specifically, the present invention uses a diesel hammer to impact the hole, and a pile driver is used to drive a steel pipe into the soil during construction. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is formed, the steel pipe is slowly pulled up. When the bottom of the hole has reached the effective depth, the filling operation can be carried out. The rammer used in the present invention has a diameter of 400mm and a mass of 1 ton. The number of ramming times for each layer of filler is 8.

[0056] Step 5: After the gangue recycled material lime-soil pile is constructed, the pile effect is tested, and the lime-soil compaction piles in the area are tested, and the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles in the area are compared and analyzed. There is no significant difference in the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles of the present invention.

[0057] Example 3

[0058] A method for treating collapsible loess foundation, the specific steps are as follows:

[0059] Step 1: Detect the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment; specifically, the present invention is based on the on-site investigation report data, and evenly determines the positions of 3 exploration wells within the construction site. The exploration well depth is determined to be 6m according to the original design pile length. A soil sample is taken every 1m within the sampling depth, for a total of 3 groups, and finally a total of 18 samples are taken. The soil samples are numbered and brought back. Through indoor tests, the physical indicators of moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity ratio of the original soil are obtained. At the same time, it is also necessary to measure the mechanical indicators of the collapsibility coefficient, compression coefficient a, and compression modulus Es of the original soil, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site.

[0060] Step 2: crush the coal gangue; the specific steps are as follows:

[0061] (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh;

[0062] (2) heat treating the powder at 600° C. for 3 h under an inert atmosphere;

[0063] (3) Cooling the heat-treated material to room temperature;

[0064] (4) Crush the cooled powder and pass it through a 300-mesh sieve.

[0065] Step 3: Add quicklime, sodium hydroxide and water glass to the crushed coal gangue and mix them evenly to obtain a mixed filler; the mass percentage of quicklime in the mixed filler of the present invention is 5%; the mass percentage of sodium hydroxide in the mixed filler is 2%; the mass percentage of water glass in the mixed filler is 15%.

[0066] Step 4: Fill the pile hole with the mixed filler to make multiple groups of coal gangue recycled material ash soil piles; specifically, the present invention uses a diesel hammer to impact the hole, and a pile driver is used to drive a steel pipe into the soil during construction. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is formed, the steel pipe is slowly pulled up. When the bottom of the hole has reached the effective depth, the filling operation can be carried out. The rammer used in the present invention has a diameter of 400mm and a mass of 1 ton. The number of ramming times for each layer of filler is 8.

[0067] Step 5: After the gangue recycled material lime-soil pile is constructed, the pile effect is tested, and the lime-soil compaction piles in the area are tested, and the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles in the area are compared and analyzed. There is no significant difference in the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles of the present invention.

[0068] Example 4

[0069] A method for treating collapsible loess foundation, the specific steps are as follows:

[0070] Step 1: Detect the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment; specifically, the present invention is based on the on-site investigation report data, and evenly determines the positions of 3 exploration wells within the construction site. The exploration well depth is determined to be 6m according to the original design pile length. A soil sample is taken every 1m within the sampling depth, for a total of 3 groups, and finally a total of 18 samples are taken. The soil samples are numbered and brought back. Through indoor tests, the physical indicators of the moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity of the original soil are obtained. At the same time, it is also necessary to measure the mechanical indicators of the collapsibility coefficient, compression coefficient a, and compression modulus Es of the original soil, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site.

[0071] Step 2: crush the coal gangue; the specific steps are as follows:

[0072] (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh;

[0073] (2) heat treating the powder at 800° C. for 2 h under an inert atmosphere;

[0074] (3) Cooling the heat-treated material to room temperature;

[0075] (4) Crush the cooled powder and pass it through a 200-mesh sieve.

[0076] Step 3: Add quicklime, sodium hydroxide and water glass to the crushed coal gangue and mix them evenly to obtain a mixed filler; the mass percentage of quicklime in the mixed filler of the present invention is 3%; the mass percentage of sodium hydroxide in the mixed filler is 5%; the mass percentage of water glass in the mixed filler is 15%.

[0077] Step 4: Fill the pile hole with the mixed filler to make multiple groups of coal gangue recycled material ash soil piles; specifically, the present invention uses a diesel hammer to impact the hole, and a pile driver is used to drive a steel pipe into the soil during construction. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is formed, the steel pipe is slowly pulled up. When the bottom of the hole has reached the effective depth, the filling operation can be carried out. The rammer used in the present invention has a diameter of 400mm and a mass of 1 ton. The number of ramming times for each layer of filler is 8.

[0078] Step 5: After the gangue recycled material lime-soil pile is constructed, the pile effect is tested, and the lime-soil compaction piles in the area are tested, and the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles in the area are compared and analyzed. There is no significant difference in the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles of the present invention.

[0079] Example 5

[0080] A method for treating collapsible loess foundation, the specific steps are as follows:

[0081] Step 1: Detect the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment; specifically, the present invention is based on the on-site investigation report data, and evenly determines the positions of 3 exploration wells within the construction site. The exploration well depth is determined to be 6m according to the original design pile length. A soil sample is taken every 1m within the sampling depth, for a total of 3 groups, and finally a total of 18 samples are taken. The soil samples are numbered and brought back. Through indoor tests, the physical indicators of moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity ratio of the original soil are obtained. At the same time, it is also necessary to measure the mechanical indicators of the collapsibility coefficient, compression coefficient a, and compression modulus Es of the original soil, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site.

[0082] Step 2: crush the coal gangue; the specific steps are as follows:

[0083] (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh;

[0084] (2) heat treating the powder at 700° C. for 3 h under an inert atmosphere;

[0085] (3) Cooling the heat-treated material to room temperature;

[0086] (4) Crush the cooled powder and pass it through a 300-mesh sieve.

[0087] Step 3: Add quicklime, sodium hydroxide and water glass to the crushed coal gangue and mix them evenly to obtain a mixed filler; the mass percentage of quicklime in the mixed filler of the present invention is 4%; the mass percentage of sodium hydroxide in the mixed filler is 3%; the mass percentage of water glass in the mixed filler is 15%.

[0088] Step 4: Fill the pile hole with the mixed filler to make multiple groups of coal gangue recycled material ash soil piles; specifically, the present invention uses a diesel hammer to impact the hole, and a pile driver is used to drive a steel pipe into the soil during construction. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is formed, the steel pipe is slowly pulled up. When the bottom of the hole has reached the effective depth, the filling operation can be carried out. The rammer used in the present invention has a diameter of 400mm and a mass of 1 ton. The number of ramming times for each layer of filler is 8.

[0089] Step 5: After the gangue recycled material lime-soil pile is constructed, the pile effect is tested, and the lime-soil compaction piles in the area are tested, and the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles in the area are compared and analyzed. There is no significant difference in the effects of the gangue recycled material lime-soil piles and the lime-soil compaction piles of the present invention.

[0090] Comparative Example 1

[0091] Compared with Example 1, the only difference is that the pile hole filler used in step 4 is the coal gangue after crushing in step 2. After testing, the overall support strength of the lime-soil compaction pile of the coal gangue recycled material lime-soil pile is significantly lower than that of the lime-soil compaction pile in this area.

[0092] Comparative Example 2

[0093] Compared with Example 1, the only difference is that the pile hole filler used in step 4 is a mixed filler obtained by adding quicklime and water glass to the crushed coal gangue and mixing them evenly; the mass percentage of quicklime in the mixed filler of the present invention is 5%; the mass percentage of water glass in the mixed filler is 10%. After testing, the overall support strength of the lime-soil compaction pile of the coal gangue recycled material lime-soil pile is significantly lower than that of the lime-soil compaction pile in this area.

[0094] Comparative Example 3

[0095] Compared with Example 1, the only difference is that the pile hole filler used in step 4 is a mixed filler obtained by adding water glass to the crushed coal gangue and mixing evenly; the mass percentage of water glass in the mixed filler of the present invention is 10%. After testing, the overall support strength of the lime-soil compaction pile of the coal gangue recycled material lime-soil pile is significantly lower than that of the lime-soil compaction pile in this area.

[0096] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A method for treating collapsible loess foundation, characterized in that: The following steps are involved: Step 1: Test the foundation site before pile construction to obtain the physical and mechanical properties of the original soil foundation before foundation treatment; Step 2: crushing the coal gangue; Step 3: adding quicklime, sodium hydroxide and water glass to the crushed coal gangue and mixing them evenly to obtain a mixed filler; Step 4: Filling the pile hole with the mixed filler to produce multiple groups of coal gangue recycled material ash soil piles; Step 5: After the construction of the gangue recycled material ash-soil pile body is completed, the effect of the pile body is tested, and the ash-soil compaction piles in the area are tested at the same time, and the effects of the gangue recycled material ash-soil piles and the ash-soil compaction piles in the area are compared and analyzed.

2. The method for treating collapsible loess foundation according to claim 1, characterized in that: The first step is to determine the locations of three exploration wells evenly within the construction site based on the on-site investigation report data. The depth of the exploration wells is determined to be 6m according to the original designed pile length. A soil sample is taken every 1m within the sampling depth, for a total of 3 groups. Finally, a total of 18 samples are taken. The soil samples are numbered and brought back for indoor tests to obtain the physical indicators of the original soil, such as moisture content, soil particle weight, dry density, maximum dry density, saturation, and porosity ratio, so as to understand the physical and mechanical properties of the original soil at the construction site and conduct a preliminary evaluation of the test site.

3. The method for treating collapsible loess foundation according to claim 1, characterized in that: The method for crushing the coal gangue in step 2 comprises the following steps: (1) crushing the coal gangue by a crusher to obtain powder with a size less than 100 mesh; (2) heat treating the powder at 600-800° C. for 2-3 hours under an inert atmosphere; (3) Cooling the heat-treated material to room temperature; (4) Crush the cooled powder and pass it through a 200-300 mesh sieve.

4. The method for treating collapsible loess foundation according to claim 1, characterized in that: The mass percentage of quicklime in the mixed filler is 3-5%; the mass percentage of sodium hydroxide in the mixed filler is 1-5%; and the mass percentage of water glass in the mixed filler is 10-15%.

5. The method for treating collapsible loess foundation according to claim 1, characterized in that: Step 4 The specific construction method of coal gangue recycled material lime soil pile is as follows: A diesel hammer is used to impact and drill holes. During construction, a pile driver is used to drive a steel pipe into the soil. The diameter of the steel pipe is the same as the pile hole. During the hammering process, the compaction of the soil around the pile gradually increases. After the hole is drilled, the steel pipe is slowly pulled out. When the bottom of the hole has reached the effective depth, filling operations can be carried out.