CN116607548A - Side slope supporting structure and side slope supporting method - Google Patents

Abstract

The application discloses a side slope support structure and a side slope support method, which are applied to projects that need to excavate foundation pits at the slope foot of the slope, including: cast-in-place pile components, including cast-in-place piles at the foot of the slope and cast-in-place piles in the foundation pit, The upper part of the cast-in-place pile at the foot of the slope is attached to the foot of the slope, and the lower part is inserted into the ground; the cast-in-situ pile of the foundation pit is inserted into the ground, and is attached to the side wall of the foundation pit near the foot of the slope; the cast-in-situ pile at the foot of the slope and the pouring of the foundation pit The piles are arranged at intervals to form the toe platform; the anchor components include multiple toe anchors and multiple foundation pit anchors, and the multiple toe anchors are arranged on the side of the toe pouring pile away from the foundation pit pouring pile, and inserted oblique For a side slope, a plurality of foundation pit anchors are arranged between the cast-in-place piles of the foundation pit and the cast-in-place piles at the foot of the slope, and are obliquely inserted under the platform of the foot of the slope. In this way, the present application solves the problem of easy landslides caused by the interaction between the slope and the foundation pit.

Description

A slope support structure and a slope support method

technical field

The invention relates to the technical field of buildings, in particular to a slope support structure and a slope support method.

Background technique

During the construction process, there are more and more engineering cases combining permanent slope and temporary foundation pit at the foot of the slope. Generally, the upper part is a permanent slope and the bottom is a temporary foundation pit. For high and steep slopes with deep and thick fill, various support schemes such as grading, anti-slide piles, lattice beams combined with anchor rods (cables) are generally adopted. For temporary foundation pits, support methods such as support piles plus anchor cables or internal supports are generally used. Due to the influence of planning and construction schemes, the temporary foundation pits at the foot of the permanent slope of the mountain are often excavated relatively large, and the sideline of the foundation pit is relatively close to the footline of the slope, and the slope and the foundation pit are mutually restricted. If the design and construction of the permanent slope at the top or the temporary foundation pit at the bottom are considered separately, without considering the mutual influence of the two, it is easy to cause the foundation pit or slope to become unstable. Specifically, in many projects, the step of excavating the temporary foundation pit at the foot of the slope occurs after the construction of the permanent slope is completed. Due to the weak support structure of the foundation pit or the defect of the permanent slope support plan, the The instability of the pit will cause landslides on the constructed side slopes, forming traction-type shallow landslides or pushing-type deep landslides. All in all, the existing permanent slope combined with the temporary foundation pit at the foot of the slope is prone to landslides.

Contents of the invention

The invention proposes a side slope support structure and a side slope support method, aiming at solving the problem of easy landslide existing in the existing engineering combining side slope and foundation pit.

In order to solve the above problems, this application proposes a slope support structure, which is applied to the project that needs to excavate a foundation pit at the foot of the slope, including cast-in-place pile components, including cast-in-place piles at the foot of the slope and cast-in-situ piles in the foundation pit, the slope The upper part of the cast-in-place pile is attached to the foot of the slope, and the lower part is inserted into the ground; the cast-in-place pile of the foundation pit is inserted into the ground, and is attached to the side wall of the foundation pit near the foot of the slope; The cast-in-place piles at the foot of the slope and the cast-in-situ piles of the foundation pit are arranged at intervals to form a toe platform; the anchor assembly includes a plurality of toe anchors and a plurality of foundation pit anchors, and a plurality of the toe anchors are arranged on the toe The cast-in-place pile at the foot of the slope is close to the side of the slope, and is inserted obliquely into the slope, and a plurality of foundation pit anchors are arranged between the cast-in-place pile at the foundation pit and the cast-in-place pile at the foot of the slope, and are inserted obliquely Below the toe platform.

In one embodiment, the slope is arranged downwardly from the top of the slope to the foot of the slope, the cast-in-place pile assembly further includes at least one cast-in-place pile in the slope, and the anchor assembly also includes a plurality of anchor pieces in the slope, the The cast-in-place pile in the slope is arranged between the top and the foot of the slope, the anchor at the foot of the slope is arranged between the cast-in-place pile at the foot of the slope and the cast-in-place pile in the slope, and the anchor in the slope is arranged In the slope, the cast-in-place pile is close to the side of the top of the slope, and inserted obliquely into the side slope.

In one embodiment, the slope support structure further includes a plurality of grouting pipes, the grouting pipes are used to insert into the slope and grout to reinforce the soil, the cast-in-place piles in the slope, the slope toe The grouting pipes are provided on the side of the cast-in-situ pile near the top of the slope.

In one embodiment, there is a gap between the foundation pit anchor and the cast-in-situ pile at the slope toe.

In one embodiment, the distance between the cast-in-place piles in the foundation pit and the cast-in-place piles at the foot of the slope is a, where 15m≤a≤30m.

In one embodiment, the toe platform is a hardened structure.

In one embodiment, the slope support structure further includes a slope top drainage ditch and a slope foot drainage ditch, the slope top drainage ditch is arranged at the slope top of the slope, and the slope foot drainage ditch is arranged at the slope top The platform at the foot of the slope is described, and the drainage ditch at the top of the slope and the drainage ditch at the foot of the slope are connected to the external drainage system.

In one embodiment, at least one horse path platform is further provided on the broken surface of the slope, a hardened section is provided on the side of the horse path platform away from the slope toe, and a side of the horse path platform close to the slope toe The side is connected with a water retaining plate, and the hardened section, the horseway platform, and the water retaining plate are jointly enclosed to form a drainage ditch in the slope, and the drainage ditch in the slope is connected to the external drainage system.

The application also proposes a slope support method, which uses the above-mentioned slope support structure, including the following steps:

S1, Excavate the side slope layer by layer from the top of the slope to the foot of the slope. In the process of excavating each layer of soil, after completing the installation of anchor components or cast-in-situ pile components in each layer of soil, excavate the next layer of soil body.

In one embodiment, the slope support method also includes the following steps:

S2, after the construction of the cast-in-situ piles at the foot of the slope is completed, the slope is inspected, and after the stability of the slope is qualified, the platform at the foot of the slope is hardened, and the anchors at the foot of the slope and the cast-in-situ piles at the foot of the slope are constructed.

In this way, the present application proposes a slope support structure and a slope support method. Specifically, the slope support structure includes cast-in-place piles at the foot of the slope, cast-in-place piles for the foundation pit, anchors at the foot of the slope, and anchors for the foundation pit , wherein, the cast-in-place piles at the toe of the slope and the anchors at the toe of the slope reinforce the toe of the slope, and the cast-in-place piles at the foundation pit reinforce the side of the foundation pit near the toe of the slope, and the cast-in-place piles at the toe of the slope and the cast-in-place piles of the foundation pit are arranged at intervals, forming a There is a platform at the foot of the slope, and the installation space for the foundation pit anchor is provided under the platform of the foot of the slope, which further improves the stability of the foundation pit near the foot of the slope, thereby solving the problem of easy landslides in the engineering of the slope combined with the foundation pit.

Description of drawings

Fig. 1 is the structural representation of the slope support structure of the embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the original slope before excavation of the slope according to the embodiment of the present invention.

Detailed ways

The specific implementation manner of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be understood that "front", "rear", "upper", "lower", "left", "right", "longitudinal", "horizontal", "vertical", " The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings and constructed in a specific orientation and operation are only for the convenience of describing the technical solution, but do not indicate that the device or element referred to must have a specific orientation, so it should not be construed as a limitation of the present invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "hoisting", "binding", and "fixing" should be interpreted in a broad sense, for example, it can be a binding connection, a fixed connection, or an integral body; It can be a mechanical connection or an electric welding connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

With the development of the city, there are more and more engineering cases combining permanent slopes and temporary foundation pits at the foot of the slope. Generally, the upper part is a permanent slope and the bottom is a temporary foundation pit. For permanent high and steep slopes in engineering, various support schemes such as grading, anti-slide piles, lattice beams + anchor rods (cables) are generally used, and temporary foundation pits are generally supported by support piles + anchor cables and rear internal supports. method. Due to the influence of planning and construction schemes, the temporary foundation pits at the foot of the permanent slope of the mountain are often excavated relatively large, and the sideline of the foundation pit is relatively close to the footline of the slope, and the slope and the foundation pit are mutually restricted. If the permanent slope at the top and the temporary foundation pit at the bottom are considered separately during design and construction, it will often cause instability of the foundation pit or slope. Weak or defective permanent slope support schemes lead to the instability of the foundation pit at the foot of the slope, which in turn causes landslides on the constructed slope, forming traction-type shallow landslides or pushing-type deep landslides.

For complex site conditions, high and steep slopes with deep fill or weak soil layers, there are few engineering practices for combining temporary foundation pits. The foot side is deep, and the foundation pit cannot use internal support to form a symmetrical support system. Therefore, the influence of the excavation of the foundation pit must be considered for the permanent slope, and the influence of the slope must also be considered for the excavation of the foundation pit.

Therefore, it is urgent to ensure the safety of both supporting structures in deep fill, high steep slope and foundation pit projects, especially when the foundation pit is excavated to the bottom of the pit and is not backfilled in time, which is the most unfavorable working condition. There is a need for a permanent combined support method.

Please refer to Fig. 1, in order to solve the above-mentioned problems, this application proposes a kind of side slope support structure, is applied to the engineering that needs to excavate foundation pit at the foot of slope slope, comprises cast-in-place pile assembly 10, comprises cast-in-place pile 12 and foundation Pit cast-in-place pile 11, the upper half of the slope toe cast-in-place pile 12 is attached to the slope toe, and the lower half is inserted into the ground; the foundation pit cast-in-place pile 11 is inserted into the ground, and attached to the foundation pit close to the The side wall on one side of the slope toe is set; the toe cast-in-situ piles 12 and the foundation pit poured piles 11 are arranged at intervals to form a slope toe platform 300; the anchor assembly 20 includes a plurality of slope toe anchors 22 and a plurality of foundation pits Anchor 21, a plurality of toe anchors 22 are arranged on the side of the toe cast-in-place pile 12 close to the slope, that is, a plurality of toe anchors 22 are arranged on the toe cast-in-place pile 12 A side away from the cast-in-place pile 11 of the foundation pit, and inserted into the slope obliquely, a plurality of anchors 21 of the foundation pit are arranged between the cast-in-place pile 11 and the cast-in-place pile 12 at the foot of the slope, and are inclined Inserted below the toe platform 300 .

Specifically, in the process of slope support, cast-in-situ piles are often used to reinforce the slope, resist the lateral pressure of the earth, and prevent the displacement of the earth. The slope support structure proposed in this application is provided with cast-in-place piles 12 at the toe of the slope, and with cast-in-place piles 11 at the side of the foundation pit near the toe of the slope. It is used to respectively reinforce the parts where the slope toe and the foundation pit are close to each other, so as to reduce the influence between the slope and the foundation pit. At the same time, this application also sets a toe platform 300 between the toe of the slope and the foundation pit. The setting of the toe platform 300 meets the design requirements, and a certain buffer is set between the toe of the slope and the foundation pit to further avoid mutual restriction of the two.

In order to further strengthen the soil, the slope support structure is often equipped with various anchors, such as anchor rods, anchor cables, etc. Anchor rod and anchor cable are the rod system structure of rock and soil reinforcement. Through the anchoring effect of the bolt and anchor body in the rock and soil body, it overcomes the shortcoming that the tensile capacity of the rock and soil body is far lower than the compressive capacity, and ensures that the anchor rod can fully exert its tensile strength. In fact, the anchor rod and the rock-soil body form a new complex with the anchor rod located in the rock-soil body. The reliability of this complex is the key to solving the low tensile capacity of the surrounding rock mass. As a result, the bearing capacity of the rock and soil itself is greatly enhanced. In one embodiment, the anchor rod generally adopts steel bars with a diameter of 25-32mm, a distance of 2.0m, a length of 9-15m, and a hole diameter of 130mm. 36m, the hole diameter is 180mm, and the penetration angle is 20 degrees. In another embodiment. After constructing the cast-in-situ pile 12 at the foot of the slope, an anchor cable of the cast-in-situ pile is also set at the foot of the slope pile 12, and the anchor cable is a permanent structure for stabilizing the cast-in-situ pile 12 at the foot of the slope. Optionally, the permanent anchor cables here use 6 bundles of 1x7 s15.2 steel strands with a spacing of 2.0m, a length of 36-42m, and a hole diameter of 180mm, which should enter the fully weathered rock for no less than 14m.

Please refer to Fig. 1, in one embodiment, the slope is set downwards from the top of the slope to the foot of the slope, the cast-in-situ pile assembly 10 also includes at least one cast-in-place pile 13 in the slope, and the anchor assembly 20 also includes multiple An anchor 23 in the slope, the cast-in-place pile 13 in the slope is arranged between the slope crest and the foot of the slope, and the anchor 22 of the slope foot is arranged in the cast-in-place pile 12 and the slope at the foot of the slope Between the cast-in-place piles 13, the in-slope anchors 23 are arranged on the side of the in-slope cast-in-place piles 13 close to the top of the slope, and are obliquely inserted into the side slope.

According to the scale of the slope, one or more rows of cast-in-place piles 13 can be arranged in the slope. In one embodiment, a plurality of cast-in-place piles 13 are arranged at intervals from the top of the slope to the foot of the slope. And the specification, model of the anchor rod that the anchor 23 adopts in the slope, the anchor cable are similar to the anchor 22 at the foot of the slope. In the construction process, the mid-slope anchors 23 and the slope toe anchors 22 are driven in layers and at intervals in the process of excavating the soil layer by layer, and are stretched and locked after reaching the design strength requirements. Optionally, the cast-in-situ piles 13 in the slope and the cast-in-place piles 12 at the foot of the slope are all made of large-diameter cast-in-situ piles. The hole forming of the cast-in-place pile adopts the construction technology of rotary digging, impact hole, long spiral hole or full-sleeve full-rotary drilling rig. Optionally, with a diameter of 1500mm and a spacing of 2.0m, the bottom of the pile should pass through the slip zone between the fill and the undisturbed soil and enter the fully weathered rock for no less than 5m.

In one embodiment, the slope support structure further includes a plurality of grouting pipes, which are used for inserting into the slope and injecting grout to reinforce the soil, the cast-in-place piles 13 in the slope, the The grouting pipes are provided on one side of the foot cast-in-place pile 12 near the top of the slope.

Optionally, the grouting pipe adopts a sleeve valve pipe. Sleeve valve grouting pipe is a kind of grouting pipe used in geotechnical engineering foundation reinforcement, compaction, filling and anti-seepage and other projects. It consists of expansion hose, fixed joint, grouting core pipe and water injection pipe. It is worth noting that, before constructing the cast-in-place piles 13 in the slope and the cast-in-place piles 12 at the foot of the slope, it is necessary to install 4 rows of sleeve valve tubes for grouting on the side of the excavated slope close to the cast-in-place piles, so as to prevent the large-diameter cast-in-place piles from causing severe damage. The construction side slope and the top of the slope are important to ensure the safety of the building.

In another embodiment, the grouting hole of the sleeve valve pipe is drilled with a core drilling machine, the hole diameter is 76mm, and the steel casing is used to protect the hole to a certain depth (about 200mm) on the bedrock surface or cohesive soil. If it is difficult to drill Holes formed into holes shall be protected by double-layer or multi-layer steel casings. Moreover, after the grouting hole of the sleeve valve pipe is formed, the hole is sealed with casing material (the casing material can be made by mixing bentonite and cement, and the consolidation strength is not greater than 0.5MPa, and the ingredients should be prepared according to the field test), pouring 42.5R For ordinary Portland cement slurry, the water-cement ratio is 0.5-1.0, the grouting pressure is 1.2-1.5MPa, the grouting volume is 500kg/m, and the grouting hole is set 1m below the surface to the bottom of the hole.

Please refer to FIG. 1 , in one embodiment, there is a gap between the foundation pit anchor 21 and the cast-in-place pile 12 at the slope foot. Specifically, the horizontal direction from the top of the slope to the foot of the slope is called the length direction, the direction downward from the foot of the slope is called the height direction, and the direction extending along the section of the slope is called the width direction. Wherein, the width direction, the height direction, and the length direction are all set vertically. At the same height, there are multiple cast-in-place piles 11 in the foundation pit, cast-in-place piles 12 at the foot of the slope, and cast-in-place piles 13 in the slope along the width direction. Optionally, a drain hole is also provided between two adjacent cast-in-place piles 12 at the foot of the slope, for draining accumulated water in the slope.

The foundation pit anchor 21 is obliquely inserted into the toe platform 300. In order to avoid the setting of the foundation pit anchor 21 from interfering with the toe pouring pile 12 and affecting its stability, the foundation pit anchor 21 and the toe pouring There should be a gap between the piles 12 . In one embodiment, this effect can be achieved by controlling the position of the foundation pit anchors 21 so that the foundation pit anchors 21 pass between two adjacent cast-in-place piles 12 at the foot of the slope. However, due to errors in the construction process, another way to avoid interference is often used. That is to control the length of the toe platform 300 , and the position, specification and model of the foundation pit anchor 21 . There is still a certain gap in the length direction between the end of the foundation pit anchor 21 inserted into the toe platform 300 and the toe cast-in-place pile 12 .

Please refer to Fig. 1 , in one embodiment, the distance between the cast-in-place piles 11 for the foundation pit and the cast-in-place piles 12 for the slope foot is a, where 15m≤a≤30m. The distance between the cast-in-place pile 11 of the foundation pit and the cast-in-place pile 12 at the toe is the length of the toe platform 300 . Since the length of the toe platform 300 is limited by the actual construction environment, if the length is too long, it may occupy too much construction space. If the length is too short, the construction of the foundation pit anchor 21 may interfere with the anchor pile at the foot of the slope, thereby affecting the stability of the slope. In one embodiment, the distance between the cast-in-place pile 11 for the foundation pit and the cast-in-place pile 12 at the foot of the slope is 20m.

Please refer to FIG. 1 , in one embodiment, the toe platform 300 is a hardened structure. In this way, a hardened construction platform is provided for the subsequent construction process of the foundation pit, and the staff does not need to construct on the mud ground, thereby improving the construction efficiency.

Please refer to Fig. 1 , in one embodiment, the slope support structure also includes a slope top drainage ditch 33 and a slope foot drainage ditch 31, and the slope top drainage ditch 33 is arranged on the slope top of the slope, so The toe drainage ditch 31 is arranged on the toe platform 300, and the top drainage ditch 33 and the toe drainage ditch 31 are connected to the external drainage system. The drainage ditch 33 at the top of the slope plays the role of intercepting water during the construction of the slope and the foundation pit, and it is retained after the construction is completed to become a part of the permanent slope drainage system.

Please refer to Fig. 1, in one embodiment, at least one horse track platform is also provided on the broken surface of the slope, the side of the horse track platform near the top of the slope is provided with a hardened section, and the horse track platform is close to the One side of the foot of the slope is connected with a water retaining plate, and the hardened section, the horseway platform, and the water retaining plate together form a mid-slope drainage ditch 32, and the mid-slope drainage ditch 32 is connected to an external drainage system. In one embodiment, the width of the horseway platform is between 1500mm and 3000mm, the thickness is between 100mm and 200mm, the width of the hardened section is between 0.5m and 2m, the width of the water barrier is between 100mm and 200mm, and the height is between 1 and 200mm. Within 1.5 meters, it will be poured together with the horse track platform. Optionally, the width of the horseway platform is 2000mm, the thickness is 150mm, the width of the hardened section is 1m, the width of the water retaining plate is 150mm, and the height is 1.2m, and it is poured together with the horseway platform.

Please refer to Fig. 1, Fig. 2, this application also proposes a kind of side slope support method, has applied the side slope support structure described above, comprises the steps:

S1, excavate the side slope layer by layer from the top of the slope to the foot of the slope, in the process of excavating each layer of soil, after completing the installation of the anchor assembly 20 or cast-in-situ pile assembly 10 in each layer of soil, excavate the next layer layer of soil.

Please refer to Fig. 2, Fig. 2 is the structural schematic diagram of (current situation) slope. That is, before excavation, the slope surface of the side slope is the current slope surface 500 , the original slope surface 400 is the original slope surface of slope accumulation or residual soil, and the deep filling layer 100 is between the current slope surface 500 and the original slope surface 400 . Step S1 is to excavate the side slope with the existing slope 500 to form an excavation surface in the deep and thick filling layer 100 . The above-mentioned excavation surface of the slope is located between the original slope surface 400 and the current slope surface 500, and the construction of the subsequent support structure is also carried out on the excavation surface.

Specifically, the construction process of the slope support structure includes the construction part of the slope and the construction part of the foundation pit. When constructing the slope, install the corresponding cast-in-place piles and anchors. It should be noted that, between constructions, soil filling is carried out on the side slope to form a side slope with an original slope surface 400, and then the side slope is excavated for construction. Specifically, during the construction process, slopes are graded layer by layer according to the design slope rate. In one embodiment, the layer thickness is 1500mm, the section length is 20m, and the classification height is 10m. After the anchors (bolts or cables) or cast-in-situ piles of the previous layer are constructed and the design strength requirements are met, the earthwork excavation of the next layer can be carried out, and the lattice beams are constructed after excavating the first-level slope, and Form a permanent slope support system for the grading section with the constructed anchors and cast-in-place piles.

In one embodiment, the slope support method also includes the following steps:

S2, after the construction of the cast-in-situ piles 12 at the foot of the slope is completed, the slope is inspected, and after the stability of the slope is qualified, the toe platform 300 is hardened, and the foundation pit anchors 21 and the cast-in-situ piles 11 of the foundation pit are carried out. construction. In this way, the hardening of the toe platform 300 is carried out after the construction of the toe cast-in-situ piles 12 and the toe anchors 22 is completed and passed the safety inspection. Avoid the construction process, the two parts at the same time to affect the stability of the structure. The interaction between the slope structure and the foundation pit structure is further reduced.

In one embodiment, the slope support structure proposed in the present application is constructed using a slope support method comprising the following steps:

(1) Construct the drainage ditch 33 at the top of the slope and connect it to the external drainage system.

(2) According to the design slope rate, the slope is graded and graded. The anchors 23 and the lattice beams in the construction slope are driven in layers and intervals. After reaching the design strength requirements, they are tensioned and locked.

(3) During the excavation process of the slope, set up a horse track platform, a water retaining plate and a hardening section on the slope surface, and connect the drainage ditch 32 formed in the slope to the external drainage system.

(4) When excavating to the installation position of the cast-in-situ pile 13 in the slope, the construction sleeve valve pipe grouting reinforces the cast-in-situ pile 13 in the slope against the loose fill soil on the side of the excavated slope, and a stable construction platform for the cast-in-situ pile is set up, and the cast-in-situ pile in the construction slope The cast-in-situ pile 13 and the anchor cable of the cast-in-place pile 13 in the slope.

(5) According to the method of step (2), construct the anchor 22 at the foot of the slope until the excavation reaches the installation position of the cast-in-place pile 12 at the foot of the slope. , set a stable cast-in-place pile construction platform, construct cast-in-place piles 12 at the foot of the slope, and anchors at the foot of the slope 22, wherein the anchor at the foot of the slope 22 includes anchor cables and crown beams, and after reaching the design strength requirements, tension and lock the anchors, Excavate the earthwork to the slope toe platform 300.

(6) Construction of the slope toe platform 300, excavation of the slope toe drainage ditch 31, and connection of the slope toe drainage ditch 31 to the external drainage system.

(7) After the above-mentioned construction is completed, carry out safety inspection on it. After passing the inspection, the toe platform 300 is hardened, and the foundation pit anchors 21 and foundation pit pouring piles 11, as well as the main structure engineering piles of the foundation pit, are constructed according to the foundation pit construction. It is required to excavate the foundation pit layer by layer from top to bottom.

(8) Construction of the basement is carried out through the foundation pit. After the construction of the basement is completed, the foundation pit is backfilled to carry out the construction of the superstructure.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A slope support structure, which is applied to the engineering that needs to excavate a foundation pit at the foot of the slope, is characterized in that, comprising: The cast-in-place pile assembly includes the cast-in-place pile at the foot of the slope and the cast-in-situ pile for the foundation pit. The upper half of the cast-in-situ pile at the foot of the slope is attached to the foot of the slope, and the lower part is inserted into the ground; the cast-in-situ pile for the foundation pit is inserted into the ground, and The side wall of the foundation pit is set close to the side of the slope foot; the slope foot filling pile and the foundation pit filling pile are arranged at intervals to form a slope foot platform; An anchoring assembly, including a plurality of toe anchors and a plurality of foundation pit anchors, the plurality of toe anchors are arranged on the side of the toe cast-in-place pile close to the slope, and inserted obliquely into the side slope A plurality of said foundation pit anchors are arranged between said foundation pit cast-in-place pile and said slope toe cast-in-place pile, and are obliquely inserted under said slope toe platform. 2. The side slope support structure as claimed in claim 1, wherein the side slope is inclined downward from the top of the slope to the foot of the slope, and the cast-in-place pile assembly also includes at least one cast-in-place pile in the slope, the said cast-in-place pile The anchor assembly also includes a plurality of mid-slope anchors, the mid-slope cast-in-place piles are arranged between the slope crest and the slope toe of the slope, and the slope toe anchors are arranged between the slope toe cast-in-place piles and the slope Between the mid-slope cast-in-place piles, the mid-slope anchor is arranged on a side of the mid-slope mid-slope near the top of the slope, and is obliquely inserted into the side slope. 3. The slope support structure as claimed in claim 2, characterized in that, the slope support structure also comprises a plurality of grouting pipes, and the grouting pipes are used for inserting into the slope and injecting grout to reinforce the soil body, the side of the cast-in-place pile in the slope and the cast-in-place pile at the foot of the slope is provided with the grouting pipe near the top of the slope. 4. The slope support structure according to claim 1, characterized in that there is a gap between the foundation pit anchor and the cast-in-place pile at the foot of the slope. 5. The slope support structure according to claim 1, characterized in that, the distance between the cast-in-place piles in the foundation pit and the cast-in-place piles at the foot of the slope is a, wherein 15m≤a≤30m. 6. The slope support structure according to claim 1, wherein the slope toe platform is a hardened structure. 7. The slope support structure according to claim 1, characterized in that, the slope support structure also includes a slope top drainage ditch and a slope foot drainage ditch, and the slope top drainage ditch is arranged on the slope The slope top, the slope foot drainage ditch is arranged on the slope foot platform, and the slope top drainage ditch and the slope foot drainage ditch are connected to the external drainage system. 8. The slope support structure according to claim 7, characterized in that, at least one horse track platform is also provided on the breaking surface of the slope, and the side of the horse track platform away from the slope toe is provided with a hardened Section, the side of the bridleway platform close to the foot of the slope is connected with a water retaining plate, and the hardened section, the bridleway platform, and the water dam are jointly enclosed to form a drainage ditch in the slope, and the drainage ditch in the slope Access to external drainage system. 9. A slope support method, characterized in that the slope support structure as claimed in any one of claims 1 to 8 is applied, comprising the steps of: S1, Excavate the side slope layer by layer from the top of the slope to the foot of the slope. In the process of excavating each layer of soil, after completing the installation of anchor components or cast-in-situ pile components in each layer of soil, excavate the next layer of soil body. 10. slope support method as claimed in claim 9, is characterized in that, also comprises the steps: S2. After the construction of the cast-in-situ piles at the foot of the slope is completed, the side slope is inspected, and after the stability of the slope is qualified, the platform at the foot of the slope is hardened, and the foundation pit anchors and the cast-in-situ piles of the foundation pit are constructed.