CN108978687A - It is a kind of landslide and slope treatment non-straight vertical anti-slide pile structure and installation method - Google Patents

Abstract

The invention discloses a non-vertical anti-slide pile structure and an installation method for landslide and side slope treatment. The method includes analyzing the landslide type, scale, landslide body thickness, landslide perimeter, sliding surface type, and sliding surface space according to survey data. Collect and investigate the physical and mechanical parameters of the rock and soil mass within the location, sliding principal axis, and landslide influence area; calculate the landslide thrust according to the mechanical model recommended by the current code according to the data collected and investigated; calculate the pile length and the length of the anchorage section of the pile according to the calculated landslide thrust Design of geometric parameters such as pile spacing and pile body section size; the non-vertical anti-slide piles and the rock and soil within the influence range of landslides are rotated into vertical anti-slide piles according to the preset angle, and the internal force of the piles is calculated and the non-vertical anti-slide piles are calculated. Type cast-in-place concrete anti-slide piles are reinforced; construction is carried out according to the designed geometric parameters and reinforcement. The invention can save a large sum of money, shorten the construction period and be beneficial to environmental protection in the landslide and side slope treatment process.

Description

Non-vertical anti-slide pile structure and installation method for landslide and slope treatment

technical field

The invention relates to the technical field of civil engineering, in particular to a non-vertical anti-slide pile structure and installation method for landslide and side slope treatment.

Background technique

The construction of road traffic, the development of hydraulic and hydropower projects, the mining of open-pit mines, and the large-scale expansion and reconstruction of cities all involve slope engineering. my country has a vast territory and complex natural conditions. Due to environmental changes, climate changes, and unreasonable excavation and filling of rock and soil by humans, natural or artificial slope.

Under certain topographic and geological conditions, due to changes in external conditions, various natural or man-made factors (such as long-term water infiltration, weakening the supporting force of the lower part of the slope, etc.), destroy the mechanical balance of the rock and soil, making the hillside unsustainable. The unfavorable geological phenomenon that the stable rock and soil mass slides downward along a certain weak surface (band) under the action of gravity, slowly or rapidly, intermittently or continuously, is called a landslide.

Landslides caused by slope instability are very serious global natural disasters. It often destroys buildings, blocks traffic, causes casualties and huge economic losses, and brings great harm to the ecological environment and engineering construction. my country is a country with many mountains (hills), and the mountains (hills) account for about 2/3 of the country's land area. It is one of the countries with more landslides in the world. Since the reform and opening up, with the vigorous development of the national economy, the large-scale construction of various engineering activities has induced the destruction of the geological environment of the slope. The number of slope instability disasters encountered in railways, highways, water conservancy, shipping, mining, construction and national defense construction is increasing year by year, and its scale and damage are also increasing. Therefore, the development of the slope analysis theory and the development of the treatment plan are problems to be solved urgently.

In addition to the objective factors affecting the stability of the slope, the deformation and failure of the slope are directly or indirectly related to unreasonable slope cutting, spoil filling, increasing slope angle, increasing slope height, reducing the anti-sliding resistance in the slope or It is related to human subjective factors such as increasing the mass of the slope. In addition, the random discharge of urban waste water or the leakage of underground pipe network will cause the slope rock and soil body to change the law of groundwater movement due to the infiltration of a large amount of water, thereby reducing the shear strength of the slope rock and soil mass and further reducing the slope degree of stability.

Correspondingly, in view of the main factors affecting slope stability, the current landslide treatment plan includes: landslide body excavation, load reduction and back pressure, retaining wall anti-slide, lattice anchorage, anti-slide piles and other measures, supplemented by measures within the scope of landslide body drainage works.

Among the above schemes, except that the drainage works within the landslide mass range cannot be used as an auxiliary means for landslide control alone, several other methods can effectively control landslides. However, their scope of application is limited to a certain extent. The landslide body excavation scheme is suitable for landslides whose scale and scope should not be too large; Landslide: Anti-slide pile is a commonly used scheme in landslide support due to its high bending stiffness, fast construction speed, and ability to penetrate below the sliding surface.

Anti-slide piles are vertical cylindrical members that penetrate deep into the rock and soil mass. Through the pile body, the landslide thrust borne by the non-anchor section is transmitted to the lateral rock and soil mass of the anchor section of the pile body, and the landslide thrust is borne by the lateral resistance of the rock and soil mass under the pile body, so that the slope remains balanced or stable.

Anti-slide piles have the following advantages:

① Strong anti-sliding ability, in the case of large landslide thrust and deep sliding zone, it can overcome the difficulties that the anti-sliding retaining wall cannot overcome;

②Pile positions are flexible, and can be located in the most favorable anti-sliding parts of the landslide body, and can be used alone or in conjunction with other buildings;

③ The steel bars can be reasonably arranged along the length of the pile according to the magnitude of the bending moment;

④Convenient construction and simple equipment. Concrete or a small amount of reinforced concrete retaining wall is used, which is safe and reliable;

⑤ Pile holes are excavated at intervals, which is not easy to deteriorate the state of the landslide, which is beneficial to the regulation of active landslides and is conducive to emergency repair projects;

⑥ By excavating pile holes, the geological conditions can be checked directly, and then the original design can be checked and modified to make it more realistic, and problems can be found and easily remedied.

The pile types of anti-slide piles include reinforced concrete prefabricated square piles, pipe piles, H-shaped steel piles, etc., and the most commonly used ones are cast-in-place reinforced concrete rectangular cross-section piles. By manual or mechanical excavation, a hole is formed vertically downward at the predetermined pile position, and the reinforcement cage is lowered to complete the concrete pouring and tamping to form a vertical anti-slide pile.

Disadvantages of existing traditional vertical anti-slide piles:

The use of vertical anti-slide piles will inevitably involve the excavation or filling of rock and soil within the landslide range, resulting in increased cost and extended construction period;

The excavation of pile holes within the scope of the landslide body to pass through the sliding surface will inevitably disturb the landslide body for a long time, which is not conducive to the early stabilization of the landslide;

The anti-slide piles installed in front of the slope of the landslide body also need to set the soil retaining board between the piles for the local stability of the soil between the piles, which increases the cost and prolongs the construction period;

In addition to setting the crown beam on the top of the pile, it is difficult to set up a firm connection for the anti-slide pile at other parts of the non-anchor section of the pile body, which is not conducive to the coordinated work of the entire anti-slide pile support system;

After completion, the anti-sliding pile retaining structures are all reinforced concrete structures, which are difficult to coordinate with the surrounding environment.

Contents of the invention

In order to eliminate the unfavorable factors of the existing vertical anti-slide piles, the embodiment of the present invention provides a non-vertical anti-slide pile structure and installation method for landslide and side slope treatment. Described technical scheme is as follows:

On the one hand, a non-vertical anti-slide pile structure for landslide and side slope treatment is provided, including: non-vertical anti-slide piles; inter-pile crossbeams are arranged between the non-vertical anti-slide piles above the slope line, The top of the non-vertical anti-slide pile is provided with a pile top crown beam; the joint between the non-vertical anti-slide pile and the cross beam between the piles and the pile top crown beam is provided with a pre-embedded plastic sleeve on the pile body. A prestressed anchor cable is arranged through the pre-embedded plastic casing.

Further, the non-vertical anti-slide pile includes: an anchor section of the non-vertical anti-slide pile body and a non-anchor section of the non-vertical anti-slide pile body; the anchor section of the non-vertical anti-slide pile depends on the slope The angle β is arranged obliquely in the stable rock and soil body before the slope, and the non-anchor section of the non-vertical anti-slide pile body is arranged on the slope surface of the landslide.

Further, the non-vertical anti-slide pile type may be a reinforced concrete prefabricated square pile, a pipe pile, an H-shaped steel pile or a cast-in-place reinforced concrete pile.

Further, the section form of the non-vertical anti-slide pile may be a circular, rectangular, triangular, trapezoidal or special-shaped pile.

On the other hand, a non-vertical anti-slide pile structure installation method for landslide and slope treatment is provided, including:

Step 1. According to the survey data, collect and investigate the landslide type, scale, landslide body thickness, landslide perimeter, sliding surface type, sliding surface spatial position, sliding main axis and rock and soil physical and mechanical parameters within the scope of the landslide;

Step 2. According to the data collected and investigated in step 1, calculate the landslide thrust according to the mechanical model recommended by the current code;

Step 3, carry out the design of geometric parameters such as pile length, anchorage depth, pile spacing and pile body section size according to the landslide thrust calculated in step 2;

Step 4. According to the anti-slide pile design plan drawn up in step 3, the non-vertical anti-slide pile and the rock and soil within the affected area of the landslide are rotated into a vertical anti-slide pile according to a preset angle, and then the internal force of the pile body is calculated and the non-vertical anti-slide pile is calculated. Type cast-in-place concrete anti-slide piles for reinforcement;

Step 5: Carry out construction according to the designed geometric parameters and reinforcement.

Further, the preset angle is 90°-β; where β is the landslide slope angle.

Further, the step five is to carry out construction according to the designed geometric parameters and reinforcement, and the steps are as follows:

Step ①Repair the slope surface of the landslide, and prepare for the formwork support of the non-anchored section of the pile body above the toe line of the slope;

Step ② According to the designed geometric parameters, pre-determined pile positions below the toe line of the slope are carried out manually digging holes obliquely downward according to the angle β of the landslide slope, and the pile holes are well protected. Anchor segment template;

Step ③ Hang the reinforcement cage along the formwork set on the slope to the predetermined depth in the inclined pile hole below the toe line of the slope, and pour concrete to complete the construction of a whole anti-slide pile;

Step ④ Complete the pouring and tamping of other anti-slide pile concrete according to steps ② to step ③ at intervals;

Step ⑤ Set pile top crown beams and pile beams as required;

Step ⑥ Set one prestressed anchor cable or multiple prestressed anchor cables at the top of the pile according to the needs. The prestressed anchor cable can pass through the pre-embedded plastic sleeve on the anti-sliding pile, or it can be installed on the crown beam of the pile and the beam between the piles. superior.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

The invention provides a non-vertical anti-slide pile structure and method for landslide and side slope treatment. ①The anti-slide pile system is coordinating force, and the structure is safe and reliable; ②The non-vertical anti-slide pile adapts to the slope angle, reduces the excavation and filling of rock and soil, and can greatly reduce the project cost and shorten the construction period; ③Anti-slide The non-anchor section of the pile body is poured and rammed concrete in the open-air formwork, the quality of the pile body is easy to control, and the construction process is simple and easy to operate; ④ Due to the slope of the landslide slope, the local stability of the soil between the piles is easy to be satisfied, so the There is no need to set up a retaining structure; ⑤ The excavation of the anchorage section of the pile body at the foot of the slope and the formwork support of the non-anchor section of the pile body on the slope surface can be carried out at the same time, and the influence between each construction process is small; ⑥ The excavation depth of the anchorage section of the pile body is relatively small. Short, the impact of manual digging on landslide disturbance can be minimized; ⑦ plant grass or small shrubs in the grid formed by anti-slide piles and beams between piles, so it is easy to adapt to the surrounding environment and is conducive to ecology Environmental protection; ⑧Wide applicability, can be applied to various complex geological conditions, various terrains, various slope angles, and various slope heights for landslide and slope control.

Therefore, the present invention can save a large sum of money, shorten the construction period, and be beneficial to environmental protection in the landslide and side slope treatment process, and is a landslide and side slope treatment scheme worthy of popularization and application.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a kind of landslide and side slope non-vertical anti-slide pile treatment front elevation view of embodiment one of the present invention;

Fig. 2 is a sectional view of A-A in Fig. 1 according to Embodiment 1 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

The present invention provides a non-vertical anti-slide pile structure for landslide and slope treatment, as shown in Figure 1-2, including: non-vertical anti-slide pile; the non-vertical anti-slide pile includes: non-vertical anti-slide A pile body anchorage section 1 and a non-vertical anti-slide pile pile body non-anchor section 2; the non-vertical anti-slide pile pile body anchorage section 1 is arranged obliquely in the stable rock and soil body before the slope according to the slope angle β, and the The non-vertical anti-slide pile body non-anchor section 2 is set on the landslide slope, and the landslide foot line 3, the sliding surface 7, and the landslide slope angle β are also marked in Fig. 1 .

The non-vertical anti-slide piles are provided with crossbeams 4 between piles, and the top of the non-vertical anti-slide piles is provided with a pile crown beam 5; the non-vertical anti-slide piles and the crossbeams 4, A pre-embedded plastic casing is arranged on the pile at the junction of the pile top crown beam 5, and a prestressed anchor cable 6 is arranged through the pre-embedded plastic casing.

Specifically, in order to adapt to the slope angle of the landslide, the anti-slide pile is set as a non-vertical columnar member deep into the stable rock and soil mass before the slope. The pile types of the non-vertical anti-slide piles can be reinforced concrete prefabricated square piles, pipe piles, and H-shaped steel piles. In this embodiment, cast-in-place reinforced concrete piles are used. The section form of the non-vertical anti-slide pile can be circular, rectangular, triangular, trapezoidal or special-shaped pile, and the rectangular section form is adopted in this embodiment. The hole forming method of the non-vertical anti-slide pile can be mechanically or manually excavated. In this embodiment, the method of manually excavating the hole is adopted. The non-vertical anti-sliding piles can be single piles, single-row piles, group piles or steel frame piles according to the structural form, and single-row piles are used in this embodiment. The non-vertical anti-sliding piles can be cantilever piles or anchor piles according to the structural stress mode, and anchor piles are used in this embodiment.

In this embodiment, the design of non-vertical anti-slide piles should generally meet the following requirements:

(1) The anti-sliding force provided by the anti-slide piles should make the entire landslide body have sufficient overall stability, that is, the stability safety factor of the landslide body meets the safety factor or reliability index specified in the corresponding codes, and at the same time, it is ensured that the slope body does not slide from the top of the pile come out, do not squeeze out from between the piles;

(2) The pile body of the anti-slide pile should have sufficient strength and stability, that is, the pile body should have sufficient rigidity, and the stress and deformation of the pile body should meet the specified requirements;

(3) The foundation resistance around the pile and the deformation of the sliding body are within the allowable range;

(4) The length of the anti-slide pile, the length of the anchorage section, the distance between the piles, the size of the pile structure and the size of the pile section are relatively appropriate, safe and reliable, feasible and convenient for construction, and relatively economical in cost.

When analyzing the internal force of the non-vertical anti-slide pile, the non-vertical anti-slide pile and the rock and soil within the influence range of the landslide can be rotated at a certain angle (90°-β, β is the slope angle of the landslide) into a vertical anti-slide The internal force of the pile body is analyzed and calculated, and the non-vertical concrete anti-slide pile is reinforced.

Embodiment two

On the other hand, a non-vertical anti-slide pile structure installation method for landslide and slope treatment is provided, including:

Step 1. According to the survey data, collect and investigate the landslide type, scale, landslide body thickness, landslide perimeter, sliding surface type, sliding surface spatial position, sliding main axis and rock and soil physical and mechanical parameters within the scope of the landslide;

Step 2. According to the data collected and investigated in step 1, calculate the landslide thrust according to the mechanical model recommended by the current code;

Step 3, carry out the design of geometric parameters such as pile length, anchor length, pile spacing and pile body section size according to the landslide thrust calculated in step 2;

Step 4. According to the design plan drawn up in step 3, the non-vertical anti-slide pile and the rock and soil within the influence range of the landslide are rotated into a vertical anti-slide pile according to a preset angle, and then the internal force of the pile body is calculated and the non-vertical anti-slide pile is calculated. Pouring concrete anti-slide piles for reinforcement;

Step 5: Carry out construction according to the designed geometric parameters and reinforcement.

Further, the preset angle is 90°-β; where β is the landslide slope angle.

Further, the step five is to carry out construction according to the designed geometric parameters and reinforcement, and the steps are as follows:

Step ①Repair the slope surface of the landslide, and prepare for the formwork support of the non-anchored section of the pile body above the toe line of the slope;

Step ② According to the designed geometric parameters, pre-determined pile positions below the slope toe line, carry out manual digging operations obliquely downward according to the slope angle β of the landslide, and do a good job of pile hole protection, and at the same time set the pile body on the slope above the slope toe line Non-anchor section formwork;

Step ③ Hang the reinforcement cage along the formwork set on the slope to the predetermined depth in the inclined pile hole below the toe line of the slope, and pour concrete to complete the construction of a whole anti-slide pile;

Step ④ Complete the pouring and tamping of other non-vertical anti-slide pile concrete according to steps ② to ③ at intervals;

Step ⑤ Set pile top crown beams and pile beams as required;

Step ⑥ Set one prestressed anchor cable or multiple prestressed anchor cables at the top of the pile according to the needs. The prestressed anchor cable can be installed through the pre-embedded plastic casing of the anti-slide pile body or on the crown beam of the pile top and the beam between the piles. .

In this embodiment, in view of the fact that the general landslide slope usually has a certain slope (the slope angle is generally less than 90°), and considering the advantages and disadvantages of traditional vertical anti-slide piles, the present invention provides a non-vertical pile for landslide and slope control. Type anti-slide pile structure and installation method. This method can adapt to the slope angle of the landslide body, and the predetermined pile position below the footline of the landslide slope is obliquely downward according to the angle β of the slope surface of the landslide, and the pile hole of the anchorage section of the anti-slide pile body is excavated by manual or mechanical excavation. Set the formwork of the non-anchor section of the anti-slide pile on the slope above the foot line, and then tilt the steel cage along the formwork of the non-anchor section of the pile body on the slope to the predetermined depth of the inclined pile hole below the foot of the slope to complete a whole anti-slide pile. Pouring and pounding of slide pile concrete.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

The invention provides a non-vertical anti-slide pile structure and an installation method for landslide and side slope treatment. ①The anti-slide pile system is coordinating force, and the structure is safe and reliable; ②The non-vertical anti-slide pile adapts to the slope angle, reduces the excavation and filling of rock and soil, and can greatly reduce the project cost and shorten the construction period; ③Anti-slide The non-anchor section of the pile body is poured and rammed concrete in the open-air formwork, the quality of the pile body is easy to control, and the construction process is simple and easy to operate; ④ Due to the slope of the landslide slope, the local stability of the soil between the piles is easy to be satisfied, so the There is no need to set up a retaining structure; ⑤ The excavation of the anchorage section of the pile body at the foot of the slope and the formwork support of the non-anchor section of the pile body on the slope surface can be carried out at the same time, and the influence between each construction process is small; ⑥ The excavation depth of the anchorage section of the pile body is relatively small. Short, the impact of manual digging on landslide disturbance can be minimized; ⑦ plant grass or small shrubs in the grid formed by anti-slide piles and beams between piles, so it is easy to adapt to the surrounding environment and is conducive to ecology Environmental protection; ⑧Wide applicability, can be applied to various complex geological conditions, various terrains, various slope angles, and various slope heights for landslide and slope control.

Therefore, the present invention can save a large sum of money, shorten the construction period, and be beneficial to environmental protection in the landslide and side slope treatment process, and is a landslide and side slope treatment scheme worthy of popularization and application.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention Inside.

Claims (7)

1. A non-vertical anti-slide pile structure for landslide and slope control, characterized in that it comprises: non-vertical anti-slide piles; crossbeams between piles are arranged between the non-vertical anti-slide piles above the foot line , the top of the non-vertical anti-slide pile is provided with a pile top crown beam; the non-vertical anti-slide pile is provided with a pre-embedded plastic sleeve at the junction of the non-vertical anti-slide pile, the cross beam between the piles, and the pile top crown beam, A prestressed anchor cable is arranged through the pre-embedded plastic casing. 2. The non-vertical anti-slide pile structure for landslide and slope control as claimed in claim 1, wherein said non-vertical anti-slide pile comprises: non-vertical anti-slide pile anchorage section and non-vertical There are two parts of the non-anchor section of the non-vertical anti-slide pile body; the anchor section of the non-vertical anti-slide pile body is obliquely arranged in the stable rock and soil before the slope according to the slope angle β, and the non-vertical anti-slide pile body The non-anchor section is set on the landslide slope. 3. the non-vertical anti-slide pile structure of landslide and slope control as claimed in claim 2, is characterized in that, described non-vertical anti-slide pile pile type can be reinforced concrete prefabricated square pile, pipe pile, H-shaped steel piles or cast-in-place reinforced concrete piles. 4. The non-vertical anti-slide pile structure for landslide and slope control as claimed in claim 3, wherein the cross-sectional form of the non-vertical anti-slide pile can be circular, rectangular, triangular, trapezoidal or special-shaped piles . 5. A non-vertical anti-slide pile structure installation method for landslide and slope control, characterized in that, comprising: Step 1. According to the survey data, collect and investigate the landslide type, scale, landslide body thickness, landslide perimeter, sliding surface type, sliding surface spatial position, sliding main axis and rock and soil physical and mechanical parameters within the scope of the landslide; Step 2. According to the data collected and investigated in step 1, calculate the landslide thrust according to the mechanical model recommended by the current code; Step 3, according to the landslide thrust calculated in step 2, carry out geometric parameter design such as pile length, pile body anchorage section length, pile spacing and pile body section size; Step 4. According to the anti-slide pile design scheme drawn up in step 3, the non-vertical anti-slide pile and the rock and soil within the influence range of the landslide are rotated into a vertical anti-slide pile according to a preset angle, and the internal force of the pile body is calculated and the non-vertical anti-slide pile is calculated. Vertical cast-in-place concrete anti-slide piles are reinforced; Step 5: Carry out construction according to the designed geometric parameters and reinforcement. 6. The method according to claim 5, wherein the preset angle is 90°-β; wherein β is the slope angle of the landslide. 7. The method according to claim 6, characterized in that, said step 5, constructing according to the designed geometric parameters and reinforcement, the steps are as follows: Step ①Repair the slope surface of the landslide, and prepare for the formwork support of the non-anchored section of the pile body above the toe line of the slope; Step 2. According to the designed geometric parameters, pre-determined pile positions below the slope toe line, carry out manual digging operations obliquely downward according to the slope angle β of the landslide, and do a good job of pile hole protection, and at the same time, set the pile body on the slope above the slope toe line. Anchor segment template; Step ③ Hang the reinforcement cage along the formwork set on the slope to the predetermined depth in the inclined pile hole below the toe line of the slope, and pour concrete to complete the construction of a whole anti-slide pile; Step ④ Complete the pouring and tamping of other anti-slide pile concrete according to steps ② to step ③ at intervals; Step ⑤ Set pile top crown beams and pile beams as required; Step ⑥ Set up one prestressed anchor cable or multiple prestressed anchor cables at the top of the pile as required. The prestressed anchor cable can be installed through the pre-embedded plastic sleeve on the anti-slide pile, or it can be installed on the crown beam of the pile and the beam between the piles. superior.