A tailings cementation filling construction method suitable for deep wells

Abstract

The present invention discloses a tailings cementation filling construction method applicable to deep wells, and relates to the technical field of deep well filling. The tailings cementation filling construction method applicable to deep wells comprises the following steps: S1, excavating shallow pits around the deep well using a shallow foundation pit excavation method, the number of shallow pits being excavated being 6-8, the depth of the shallow pits being the deepest depth that can be excavated using the shallow foundation pit excavation method, the effective diameter of the shallow pits being equal to the effective radius of the deep well, and the shallow pits being arranged symmetrically relative to the deep well during construction. The tailings cementation filling construction method applicable to deep wells, by digging additional shallow pits and filling them with the sand and soil obtained when digging the shallow pits, the sand and soil filling layer divides the tailings cementation filling layer into two layers, thereby reducing the thickness of the single-layer tailings cementation filling layer, while increasing the exposed area of ​​the upper tailings cementation filling layer, and increasing the stability of the filling material. At the same time, the equipment used for digging and mixing is different and can be carried out simultaneously, and digging additional shallow pits does not affect construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of deep well filling, in particular to a tailings cementation filling construction method suitable for deep wells. Background Art

[0002] In recent years, with the development of economy and technology, the requirements for environmental protection are getting higher and higher in the development of mining resources. The cemented filling body has high strength and good stability, can better support the surrounding rock, ensure the safe recovery of mining pillars, and prevent rock collapse and movement; improve the mining conditions of unstable and complex ore bodies, and significantly reduce the ore loss rate and depletion rate (can be reduced to below 5%); but the amount of cement used is large and the cost is high. The commonly used binder is cement, and the aggregate can be obtained locally, such as natural gravel, slag, tailings or crushed sand, stone, etc. can be used. The filling material is transported by mechanical or hydraulic pipelines. If the filling body is required to have high strength.

[0003] In the prior art, during filling, tailings are gradually added to the deep well, and then rapid hardening sulphoaluminate cement clinker and quicklime are mixed and poured into the deep well, thereby completing the deep well filling operation.

[0004] There is no problem in applying this operation to shallow pits, but if it is applied to deep wells, it is easy to have more gaps in the filling material due to the large overall thickness of the tailings cemented filling material and the small leakage area. As a result, the filling surface will be concave after being subjected to greater pressure, and multiple fillings will be required. It is difficult to ensure the construction quality. At the same time, the filling efficiency is greatly affected by the mixing efficiency, thus extending the construction period to a certain extent. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a tailings cementation filling construction method suitable for deep wells, which solves the problem that the construction method in the existing technology, if applied in deep wells, is prone to have more gaps in the filling due to the large overall thickness of the tailings cementation filling and the small leakage area, which causes the filling surface to be concave after being subjected to greater pressure, thereby requiring multiple fillings, making it difficult to ensure the construction quality. At the same time, the filling efficiency is greatly affected by the mixing efficiency, thus extending the construction period to a certain extent.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A tailings cementation filling construction method suitable for deep wells, comprising the following steps:

[0009] S1. Use shallow excavation to dig shallow pits around the deep well. The number of shallow pits is 6-8. The depth of the shallow pits is the deepest depth that can be excavated by the shallow excavation method. The effective diameter of the shallow pits may be equal to the effective radius of the deep well. During construction, the shallow pits should be set symmetrically relative to the deep well as much as possible. The minimum distance between the inner wall of the shallow pit and the inner wall of the deep well must be within 1.5-2m. The sand obtained from the excavation should be placed beside the shallow pits.

[0010] S2. Transporting tailings cementing filling raw materials and performing cementing filling operations on the deep well, wherein rapid-hardening sulphoaluminate cement clinker is used as the basic cementing activation material and quicklime is used as the activator. During transportation, each material is transported by only one transport vehicle. The tailings cementing filling raw materials include tailings, rapid-hardening sulphoaluminate cement clinker, and quicklime. The cementing filling operation is performed while transporting. When performing the cementing filling operation, this operation is performed simultaneously with step S1.

[0011] S3. When the shallow pit of step S1 is completed, the operation of step S2 is stopped, and the sand obtained by excavation is then added to the deep well for filling, and then the sand between the shallow pit and the deep well is pushed into the deep well for filling, thereby forming a sand filling layer;

[0012] S4. Continue to use fast-hardening sulphoaluminate cement clinker as the basic cementitious activation material and quicklime as the activator to continue the cementing filling operation on the deep well until the deep well is filled.

[0013] (3) Beneficial effects

[0014] The present invention provides a tailings cementation filling construction method applicable to deep wells. The method has the following beneficial effects: By digging additional shallow pits and filling them with sand and soil obtained during the digging of the shallow pits, the sand filling layer divides the tailings cementation filling layer into two layers, thereby reducing the thickness of the single-layer tailings cementation filling layer, while increasing the exposed area of ​​the upper tailings cementation filling layer and improving the stability of the filling material. Furthermore, the digging and mixing processes can be performed simultaneously using different equipment, and digging additional shallow pits does not affect construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the construction of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the present invention;

[0017] Figure 3 This is a top view of the present invention after the pit is dug;

[0018] Figure 4 A top view of the present invention showing the sand and soil between the shallow pit and the deep well being pushed down;

[0019] Figure 5 It is a construction schematic diagram in the prior art;

[0020] Figure 6 It is a structural diagram in the prior art. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-6 The present invention provides a technical solution: a tailings cementation filling construction method suitable for deep wells, comprising the following steps:

[0023] S1. Use shallow excavation to dig shallow pits around the deep well. The number of shallow pits is 6-8. The depth of the shallow pits is the deepest depth that can be excavated by the shallow excavation method. The effective diameter of the shallow pits may be equal to the effective radius of the deep well. During construction, the shallow pits should be set symmetrically relative to the deep well as much as possible. The minimum distance between the inner wall of the shallow pit and the inner wall of the deep well must be within 1.5-2m. The sand obtained from the excavation should be placed beside the shallow pits.

[0024] S2. Transporting tailings cementing filling raw materials and performing cementing filling operations on the deep well, wherein rapid-hardening sulphoaluminate cement clinker is used as the basic cementing activation material and quicklime is used as the activator. During transportation, each material is transported by only one transport vehicle. The tailings cementing filling raw materials include tailings, rapid-hardening sulphoaluminate cement clinker, and quicklime. The cementing filling operation is performed while transporting. When performing the cementing filling operation, this operation is performed simultaneously with step S1.

[0025] S3. When the shallow pit of step S1 is completed, the operation of step S2 is stopped, and the sand obtained by excavation is then added to the deep well for filling, and then the sand between the shallow pit and the deep well is pushed into the deep well for filling, thereby forming a sand filling layer;

[0026] S4. Continue to use fast-hardening sulphoaluminate cement clinker as the basic cementitious activation material and quicklime as the activator to continue the cementing filling operation on the deep well until the deep well is filled.

[0027] To sum up, the tailings cementation filling construction method suitable for deep wells is to dig additional shallow pits and use the sand and soil obtained when digging the shallow pits for filling. The sand filling layer divides the tailings cementation filling layer into two layers, thereby reducing the thickness of the single-layer tailings cementation filling layer and increasing the exposed area of ​​the upper tailings cementation filling layer, thereby increasing the stability of the filling material. At the same time, the equipment used for digging pits and mixing is different and can be carried out at the same time. Digging additional shallow pits will not affect the construction efficiency.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0029] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A tailings cementation filling construction method suitable for deep wells, characterized by: The steps include: S1. Use shallow excavation to dig shallow pits around the deep well. The number of shallow pits to be dug is 6-8. The depth of the shallow pits is the deepest depth that can be excavated using the shallow excavation method. The effective diameter of the shallow pits is equal to the effective radius of the deep well. During construction, the shallow pits should be set symmetrically relative to the deep well as much as possible. The minimum distance between the inner wall of the shallow pit and the inner wall of the deep well must be within 1.5-2m. The sand obtained from the excavation should be placed at the edge of the shallow pits. S2. Transporting tailings cementing filling raw materials and performing cementing filling operations on the deep well, wherein rapid-hardening sulphoaluminate cement clinker is used as the basic cementing activation material and quicklime is used as the activator. During transportation, each material is transported by only one transport vehicle. The tailings cementing filling raw materials include tailings, rapid-hardening sulphoaluminate cement clinker, and quicklime. The cementing filling operation is performed while transporting. When performing the cementing filling operation, this operation is performed simultaneously with step S1. S3. When the shallow pit of step S1 is completed, the operation of step S2 is stopped, and the sand obtained by excavation is then added to the deep well for filling, and then the sand between the shallow pit and the deep well is pushed into the deep well for filling, thereby forming a sand filling layer; S4. Continue to use fast-hardening sulphoaluminate cement clinker as the basic cementitious activation material and quicklime as the activator to continue the cementing filling operation on the deep well until the deep well is filled.

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