CN110820772A - Bulk accumulation body side slope slide-resistant pile and structured cementing combined reinforcing method and construction process - Google Patents
Bulk accumulation body side slope slide-resistant pile and structured cementing combined reinforcing method and construction process Download PDFInfo
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- CN110820772A CN110820772A CN201911150509.3A CN201911150509A CN110820772A CN 110820772 A CN110820772 A CN 110820772A CN 201911150509 A CN201911150509 A CN 201911150509A CN 110820772 A CN110820772 A CN 110820772A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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Abstract
The invention discloses a side slope anti-slide pile and structured cementing combined reinforcing method and a construction process for a granular stack, wherein the side slope reinforcing method comprises anti-slide pile reinforcing construction and structured grouting cementing construction, the anti-slide pile reinforcing construction is to arrange anti-slide piles in a slope body to provide anti-slide force, and the structured grouting cementing construction is to form a cementing body-granular body composite structure with a certain space structure in the granular stack body to change the original soil arch effect of granular bodies. The slope reinforcement method comprises the following steps: s1: and (5) carrying out slide-resistant pile construction, and S2: and performing structured cementation on post-pile granular particles and inter-pile granular particles by adopting a structured grouting technology. The slope reinforcing method has the advantages that the post-pile and inter-pile granular bodies are subjected to structured grouting to form a cemented body-granular body composite structure, the mechanical property of the granular bodies is improved, the soil arch effect is changed, the pile spacing is increased, the utilization rate of the bearing capacity of the slide-resistant pile is improved, and the engineering cost is reduced.
Description
Technical Field
The invention relates to the field of slope engineering reinforcement, in particular to a combined reinforcing method and a construction process of a side slope slide-resistant pile and a structured glue joint of a bulk accumulation body.
Background
In the construction of water conservancy and hydropower engineering, open-pit mine engineering and roadbed engineering, the engineering problem of reinforcing a natural loose-grain accumulation side slope or a loose-grain accumulation side slope formed by manual excavation and accumulation, such as a broken stone side slope, a refuse dump side slope, a tailing pond side slope and the like, is usually faced. The side slope of the granular bulk accumulation is different from rock slopes and soil slopes, the slope material of the granular bulk accumulation is usually in a loose granular shape, and basically no cohesive force exists among granules. The natural loose particle accumulation body side slope is usually in a critical stable state, and the loose particle accumulation body side slope formed by manual excavation and accumulation gradually reduces the stability of the side slope along with the increase of the accumulation height, so that the instability is very easy to occur under the influence of rainstorm, earthquake or manual disturbance. The existing method for reinforcing the side slope of the granular accumulation body mostly adopts the measures of slope cutting, anti-slide pile arrangement, rigid retaining wall arrangement, grouting reinforcement and the like to improve the stability, and meanwhile, the measures of pre-stressed anchor cables, drainage and water interception are assisted. The slope cutting construction difficulty is high, and the construction risk is high. The pile bottom of the slide-resistant pile is generally anchored in a stable bedrock, the upper pile body provides a slide-resistant force, and the slide deformation of the upper slope body is prevented by utilizing the soil arch effect of soil bodies among piles and behind the pile. Theories and practices show that the soil arch effect of the bulk particle accumulation body is obviously weaker than cohesive soil, the pile spacing of the slide-resistant piles needs to be reduced to keep the stability of the soil between the piles, but the utilization rate of the bearing capacity of the slide-resistant piles is reduced along with the reduction of the pile spacing, meanwhile, the construction difficulty of the slide-resistant piles is high, the safety risk in the construction period is high, and the increase of the number of the slide-resistant piles can obviously increase the engineering cost. In addition, the traditional grouting reinforcement of the side slope of the granular particles adopts cement paste or microorganisms to carry out integral cementation on the slope, but the upper slope of the grouting cementing body does not form an integral body with the lower bedrock, the anti-skid capability of the cementing body is weak, and the grouting reinforcement can only achieve the purpose of temporary reinforcement of the accumulation body and can not form permanent reinforcement. The slurry can enter gaps of the rock-soil mass for cementing and curing, so that the looseness and permeability of the rock-soil mass are reduced, the integrity, the bearing performance and the shear strength of the rock-soil mass are enhanced, and the settlement and the deformation of a slope body are prevented, so that the mechanical property and the water property of the rock-soil mass are improved.
Prior to the present invention, the invention patent: a structural cemented gravel pile and a construction method thereof' disclose a cemented gravel-gravel composite structure formed by pouring gravel materials on a self-compacting cement-based material. Years of research of the Qinghua university show that a cementing body-granular body composite structure with a certain space structure can be formed in granular bodies by controlling the fluidity, the viscosity and the filling amount of a self-compacting cement-based material, wherein the shearing strength, the elastic modulus and the deformation modulus of the cementing body-granular body composite material can be obviously improved through the hydration of the cement-based material, and meanwhile, the connectivity and the water permeability of the original pore structure of the granular bodies are kept.
Disclosure of Invention
The invention mainly aims to solve the defects of the background technology and provide a combined reinforcing method and a construction process for the side slope slide-resistant piles and the structured cement of the bulk particle accumulation body, wherein the combined reinforcing method for the side slope slide-resistant piles and the structured cement adopts the structured grouting and cementing technology, the bulk particles in a certain range behind the piles and among the piles are changed into the cement, a plurality of cements and surrounding bulk particles jointly form a cement-bulk particle composite structure, the mechanical property of the original bulk particles is improved, the soil arch effect of the bulk particles between the piles and behind the piles is changed, the pile spacing is further increased, the utilization rate of the bearing capacity of the slide-resistant piles is improved, the construction speed is improved, the construction cost is reduced, and the permanent reinforcement of the side slope of the bulk particle accumulation body can be realized.
In order to achieve the technical features, the invention is realized as follows: a method for jointly reinforcing a side slope slide-resistant pile of a bulk pile and a structural adhesive bond is characterized by comprising the following steps of: the side slope reinforcing method of the granular accumulation body comprises anti-slide pile reinforcing construction and structured grouting cementation construction, wherein the anti-slide pile reinforcing construction is to arrange anti-slide piles in a slope body, the structured grouting cementation construction is to bond part of granular bodies behind and in front of the piles into a cementing body through grouting to form a cementing body-granular body composite structure, so that the mechanical property of the original granular bodies is improved, and the soil arch effect of the original granular bodies is changed; the pores of the cementite can be densely filled with slurry and can also be partially filled to form a high-pore cementite; the cementing body-granular body composite structure formed by structural grouting and cementing transmits the downward sliding force of the slope behind the pile to the slide-resistant pile, the pile bottom of the slide-resistant pile is anchored on a stable rock stratum, the pile body on the upper portion provides the sliding resistance, the deformation of the slope behind the pile is prevented, and the slope stability is kept.
The main body anti-sliding structure of the side slope of the bulk particle accumulation body is an anti-sliding pile, the structural grouting cementation is a cementing body-bulk particle composite structure with a certain space structure formed behind the pile and in bulk particles among the piles, and the downward sliding force of the slope body is transmitted to the pile body of the anti-sliding pile through a force chain structure formed by the cementing body-bulk particle composite structure.
The slide-resistant pile is one or a plurality of conventional large-diameter slide-resistant piles, micro pile groups or rock-fill concrete slide-resistant piles.
The structured grouting cementation is that self-compaction cement-based cementing materials are conveyed to a cementation region in the granular particles through a grouting pipe, and the self-compaction cement-based cementing materials flow along the pores of the granular particles under the action of gravity to form a cemented body.
The self-compacting cement-based cementing material is one or more of self-compacting cement paste or self-compacting cement mortar which are used together.
The expansion degree of the self-compacting cement paste is 220-300 mm, the V-shaped funnel time is 1.5-2.5 s, the expansion degree of the self-compacting cement paste is 250-330 mm, and the V-shaped funnel time is 6-12 s.
The construction process of the combined reinforcing method of the bulk pile slope slide-resistant pile and the structured cementing is characterized by comprising the following steps of:
s1: determining the arrangement position of the slide-resistant piles and performing slide-resistant pile construction according to the geological conditions and stability analysis results of the side slope of the bulk particle accumulation body;
s2: according to the stability analysis result of the reinforcing scheme, the particle size and the stacking parameters of the bulk stacking body, determining the size and the spatial position of a cementing body, and the flow performance parameters and the grouting amount of the self-compacting cement-based cementing material, injecting the self-compacting cement-based cementing material into a designed cementing area in the bulk body through a grouting pipe, and allowing the self-compacting cement-based cementing material to flow along the granular pores of the bulk body under the action of gravity to form the cementing body;
s3: and (8) repeating the step (S2), grouting among the piles of the slide-resistant pile and the loose granular bodies behind the piles to form a plurality of cementing bodies, wherein the cementing bodies and the surrounding loose granular bodies jointly form a cementing body-loose granular body composite structure with a certain space structure.
The invention has the following beneficial effects:
the method for reinforcing the side slope of the granular accumulation body has the advantages that the granular bodies behind the pile and among the piles are subjected to structured grouting, the slope body formed by the accumulation of the original granular bodies is changed into a cementing body-granular body composite structure with a certain space structure, the mechanical property of the granular bodies is improved, the soil arch effect of the composite structure is enhanced, the pile spacing of the anti-slide pile can be increased, the utilization rate of the bearing capacity of the anti-slide pile is improved, and the engineering cost is reduced.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of a combined reinforcing method of a side slope slide-resistant pile of a bulk pile and a structural adhesive bond according to an embodiment of the invention.
Fig. 2 is a schematic space structure diagram of a method for reinforcing the side slope slide-resistant piles of the bulk-grain stacks by combining with structural adhesive bonds according to the embodiment of the invention.
In the figure: the anti-slide pile comprises an anti-slide pile 1, a self-compaction cement-based cementing material 2, a cementing body 3 and a granular body 4.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-2, a method for reinforcing a side slope of a bulk pile by combining an anti-slide pile and a structural cement comprises anti-slide pile reinforcing construction and structural grouting cementing construction, wherein the anti-slide pile reinforcing construction is to arrange the anti-slide pile 1 in a slope body, the structural grouting cementing construction is to cement part of granular particles 4 in the bulk pile after and before the pile into a cement body 3 by grouting, and the cement body 3 and the peripheral granular particles 4 jointly form a cement body-granular particle composite structure, so that the mechanical property of the original granular particles is improved, and the soil arch effect of the original granular particles is changed; the cementing body-granular body composite structure formed by structural grouting and cementing transmits the downward sliding force of the slope body behind the pile to the slide-resistant pile through the soil arch effect, the pile bottom of the slide-resistant pile is anchored on a stable rock stratum, the downward sliding force of the slope body is balanced by the anti-sliding force provided by the pile body on the upper portion, the deformation of the slope body behind the pile is prevented, and the stability of the slope is kept.
Furthermore, the main body anti-sliding structure of the side slope of the bulk particle accumulation body is an anti-sliding pile, and the structural grouting cementation is a cement body-bulk particle composite structure with a certain space structure formed behind the pile and in bulk particles among the piles. The anti-sliding performance between the original granular particles 4 is effectively enhanced by forming the cementing body 3 behind the anti-sliding pile 1 and between the piles, and further the stability of the granular particle accumulation body side slope is improved.
Further, the slide-resistant pile is one or a combination of a conventional large-diameter slide-resistant pile, a miniature pile group or a rock-filled concrete slide-resistant pile. Through adopting the friction pile of different grade type, it can select for use according to the operating mode requirement of reality, and then has improved its adaptability.
Further, the structured grouting cementation is that the self-compaction cement-based cementing material 2 is conveyed to a cementation area in the granular body 4 through a grouting pipe, and the self-compaction cement-based cementing material 2 flows along the pores of the granular body 4 under the action of gravity to form a cemented body 3. The cementing body 3 formed by the method is dispersed in the granular particles 4, and the cementing body 3 and the peripheral granular particles 4 form a cementing body-granular particles composite structure, so that the anti-skid property of the granular particles accumulation body is effectively improved.
Further, the self-compacting cement-based cementing material is one or more of self-compacting cement paste or self-compacting cement mortar. The self-compacting cement-based cementing material in different forms can be suitable for different types of bulk material stacking bodies, so that the adaptability of the self-compacting cement-based cementing material is enhanced.
Furthermore, the expansion degree of the self-compacting cement paste is 220mm-300mm, the V-shaped funnel time is 1.5s-2.5s, the expansion degree of the self-compacting cement paste is 250mm-330mm, and the V-shaped funnel time is 6s-12 s.
Example 2:
the construction process of the combined reinforcing method of the bulk pile slope slide-resistant pile and the structured cementing is characterized by comprising the following steps of:
s1: determining the arrangement position of the slide-resistant piles and performing slide-resistant pile construction according to the geological conditions and stability analysis results of the side slope of the bulk particle accumulation body;
s2: according to the stability analysis result of the reinforcing scheme, the particle size and the stacking parameters of the bulk stacking body, determining the size and the spatial position of a cementing body, and the flow performance parameters and the grouting amount of the self-compacting cement-based cementing material, injecting the self-compacting cement-based cementing material into a designed cementing area in the bulk body through a grouting pipe, and allowing the self-compacting cement-based cementing material to flow along the granular pores of the bulk body under the action of gravity to form the cementing body;
s3: and (8) repeating the step (S2), grouting among the piles of the slide-resistant pile and the loose granular bodies behind the piles to form a plurality of cementing bodies, wherein the cementing bodies and the surrounding loose granular bodies jointly form a cementing body-loose granular body composite structure with a certain space structure.
It can be understood that the construction procedure of this embodiment is used to reinforce the side slope of the granular material, wherein the granular material 4 is not completely cemented into an integral structure between piles and behind piles, but forms a cement-granular material composite structure. The cementing body 3 is obtained by flowing and attaching the self-compacting cement-based cementing material 2 in the granular body 4 and performing hydration reaction, and the cementing body 3 presents certain spatial distribution in the granular body 4. The mechanical property of the original granular body 4 is improved by the cementing body 3 in the cementing body-granular body composite structure, and the soil arch effect of the original granular body 4 is changed by the cementing body-granular body composite structure.
It can be understood that only the scattered particles behind the piles and among the piles are structurally cemented to form a cemented body-scattered particle composite structure, so that the cement-based cementing material has less grouting amount and is beneficial to environmental protection. Meanwhile, the cementing body-granular body composite structure can increase the pile spacing of the slide-resistant pile, effectively adjust the bearing capacity of the slide-resistant pile, reduce the construction cost, improve the construction speed of the project and achieve the purpose of permanently reinforcing the side slope of the granular accumulation body.
Specifically, the slide-resistant pile can adopt a large-diameter slide-resistant pile, a miniature pile group or a rock-fill concrete slide-resistant pile.
It is understood that the morphology, spatial distribution and mechanical parameters of the cement 3 in the cement-bulk composite structure can be changed by controlling the expansion, viscosity and placement of the self-compacting cement-based cementitious material 2, and that the cement 3 can be either a cement with a compact structure or a cement with a high porosity structure.
Specifically, the self-compacting cement-based cementing material is one of self-compacting cement paste and self-compacting cement mortar. The expansion degree of the self-compacting cement paste is 220mm-300mm, the V-shaped funnel time is 1.5s-2.5s, the expansion degree of the self-compacting cement paste is 250mm-330mm, and the V-shaped funnel time is 6s-12 s.
Example 3:
reference is now made to strip mine dump slope reinforcement which describes one embodiment of the present invention.
As shown in figure 1, the slope body is formed by continuously piling rock piles excavated in a mine and is reinforced by combining anti-slide piles and structural cementing. The anti-slide piles 1 are C30 anti-slide piles, the anti-slide piles 1 are arranged at the slope toe, the cross section of each anti-slide pile 1 is 1.5 multiplied by 2m, the pile bottom is embedded into the middle stroke of the fluidized bed rock by 5m, and the pile spacing is 6 m. The loose particle accumulation body 4 within the range of 10m behind the pile is poured and cemented by adopting a self-compacting cement-based cementing material 2, and a cementing body-loose particle composite structure is formed in the loose particle accumulation body 4 behind the pile. The self-compacting cement-based cementing material 2 adopts self-compacting cement mortar, the expansion degree of the self-compacting cement mortar is 280mm, and the flowing time of the V-shaped funnel is 3 s.
The concrete construction steps are as follows:
s1: and determining to arrange a row of slide-resistant piles 1 at the slope toe according to the geological exploration result of the rockfill side slope and the analysis result of the side slope stability.
S2: according to the test result, the particle size of particles of the rockfill 4 is 20-100mm, the stacking compactness is 0.3, structural cementation is carried out within 10m behind the anti-slide pile 1 according to the analysis result of the stability of the reinforced side slope, the particle size and the stacking parameters of the particle stacking 4, self-compacting cement mortar is adopted as the self-compacting cement mortar for the self-compacting cement-based cementing material 2, the self-compacting cement mortar forms a cemented body after flowing in the pore of the rockfill, the expansion degree of the self-compacting cement mortar is 280mm, and the flowing time of the V-shaped funnel is 3 s.
S3: and (3) according to the numerical analysis result and the site construction condition, repeating the grouting and cementing in the step (2), forming a plurality of cementing bodies (3) in the rock-fill bodies (4) behind the piles and among the piles according to certain spatial distribution, and forming a cementing body-granular body composite structure by the cementing bodies (3) and the surrounding rock-fill bodies (4).
Claims (7)
1. A method for jointly reinforcing a side slope slide-resistant pile of a bulk pile and a structural adhesive bond is characterized by comprising the following steps of: the side slope reinforcing method of the granular accumulation body comprises anti-slide pile reinforcing construction and structured grouting cementation construction, wherein the anti-slide pile reinforcing construction is to arrange anti-slide piles in a slope body, the structured grouting cementation construction is to bond part of granular bodies behind and in front of the piles into a cementing body through grouting to form a cementing body-granular body composite structure, so that the mechanical property of the original granular bodies is improved, and the soil arch effect of the original granular bodies is changed; the pores of the cementite can be densely filled with slurry and can also be partially filled to form a high-pore cementite; the cementing body-granular body composite structure formed by structural grouting and cementing transmits the downward sliding force of the slope behind the pile to the slide-resistant pile, the pile bottom of the slide-resistant pile is anchored on a stable rock stratum, the pile body on the upper portion provides the sliding resistance, the deformation of the slope behind the pile is prevented, and the slope stability is kept.
2. The method for reinforcing the slope slide-resistant piles of the bulk pile in combination with the structural adhesive bonds as claimed in claim 1, wherein the method comprises the following steps: the main body anti-sliding structure of the side slope of the bulk particle accumulation body is an anti-sliding pile, the structural grouting cementation is a cementing body-bulk particle composite structure with a certain space structure formed behind the pile and in bulk particles among the piles, and the downward sliding force of the slope body is transmitted to the pile body of the anti-sliding pile through a force chain structure formed by the cementing body-bulk particle composite structure.
3. The method for reinforcing the slope slide-resistant piles of the bulk pile in combination with the structural adhesive bonds as claimed in claim 1, wherein the method comprises the following steps: the slide-resistant pile is one or a plurality of conventional large-diameter slide-resistant piles, micro pile groups or rock-fill concrete slide-resistant piles.
4. The method for reinforcing the slope slide-resistant piles of the bulk pile in combination with the structural adhesive bonds as claimed in claim 1, wherein the method comprises the following steps: the structured grouting cementation is that self-compaction cement-based cementing materials are conveyed to a cementation region in the granular particles through a grouting pipe, and the self-compaction cement-based cementing materials flow along the pores of the granular particles under the action of gravity to form a cemented body.
5. The method for reinforcing the slope slide-resistant piles of the bulk pile in combination with the structural adhesive bonds as claimed in claim 4, wherein the method comprises the following steps: the self-compacting cement-based cementing material is one or more of self-compacting cement paste or self-compacting cement mortar which are used together.
6. The method for reinforcing the slope slide-resistant piles of the bulk pile in combination with the structural adhesive bonds as claimed in claim 5, wherein the method comprises the following steps: the expansion degree of the self-compacting cement paste is 220-300 mm, the V-shaped funnel time is 1.5-2.5 s, the expansion degree of the self-compacting cement paste is 250-330 mm, and the V-shaped funnel time is 6-12 s.
7. The construction process of the side slope slide-resistant pile and the structural cementing combined reinforcement method for the bulk accumulation body as claimed in any one of the claims 1 to 6, characterized in that the construction process comprises the following steps:
s1: determining the arrangement position of the slide-resistant piles and performing slide-resistant pile construction according to the geological conditions and stability analysis results of the side slope of the bulk particle accumulation body;
s2: according to the stability analysis result of the reinforcing scheme, the particle size and the stacking parameters of the bulk stacking body, determining the size and the spatial position of a cementing body, and the flow performance parameters and the grouting amount of the self-compacting cement-based cementing material, injecting the self-compacting cement-based cementing material into a designed cementing area in the bulk body through a grouting pipe, and allowing the self-compacting cement-based cementing material to flow along the granular pores of the bulk body under the action of gravity to form the cementing body;
s3: and (8) repeating the step (S2), grouting among the piles of the slide-resistant pile and the loose granular bodies behind the piles to form a plurality of cementing bodies, wherein the cementing bodies and the surrounding loose granular bodies jointly form a cementing body-loose granular body composite structure with a certain space structure.
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| CN112922019A (en) * | 2021-03-08 | 2021-06-08 | 中国长江三峡集团有限公司 | Single-pile foundation for reinforcing soft soil foundation by offshore wind power vibroflotation cemented pile and construction method |
| CN115045304A (en) * | 2022-07-15 | 2022-09-13 | 华南理工大学 | Step-by-step energy consumption retaining structure for preventing and treating slope granular disaster and construction method |
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Application publication date: 20200221 |