Horizontal active drainage system for waterlogged loess slope

Abstract

A horizontal active drainage system for a waterlogged loess slope relates to the technical field of slope drainage and comprises a drill hole arranged on a slope surface, a water seepage pipe arranged at the bottom of the drill hole, a filter layer wrapped on the side surface of the water seepage pipe, a hole packer arranged at one end of the water seepage pipe close to the slope surface, an ejector rod is arranged at the end, connected with the water seepage pipe, of the hole packer and arranged in the water seepage pipe, the other end of the hole packer is exposed out of the drill hole, and a vacuum pump is arranged at the exposed end of the hole packer. The water seepage device is high in practicability and very convenient to use, the filter layer is arranged on the water seepage pipe, the filter layer is tightly attached to the wall of a drill hole, the wall of the drill hole is free of a free face, and soil strength reduction caused by hole collapse and fine particle accumulation is avoided; the spiral blade is arranged on the hole packer, so that a good hole sealing effect is achieved; the vacuum pump on the hole packer actively pumps water to solve the problem of poor water permeability of loess, the single well influence range is large, the drainage period is short, and the effect on slope stabilization is fast.

Description

Technical Field

[0001] The utility model relates to the technical field of slope drainage, in particular to a horizontal active drainage system for saturated loess slopes. Background Technique

[0002] When the toe of a high and steep loess slope is soaked in water or there is groundwater seepage at the toe, the strength of the loess at the toe decreases after being saturated with water, and it is laterally extruded under the action of the self-weight of the upper slope body, resulting in a staggered failure of the loess slope. Generally, such loess slopes are treated by combining support and drainage. Conventional methods mostly use horizontal water collection wells drilled in the saturated loess layer for drainage. When the horizontal water collection wells are constructed by the drilling method, there are gaps between the well pipes and the hole walls. Long-term drainage causes the loss of fine particles in the loess within a certain range around the holes, reducing the soil strength. The gap between the well pipes at the hole openings and the drill holes is relatively small, and the depth of sealing the holes with clay is limited, resulting in poor sealing effect, so that water flows between the support structure and the slope surface in series. The loess slope soil layers are mostly silty clay and silt, with poor water permeability and a long soil drainage period, and their effect on stabilizing the slope is limited. Content of the Utility Model

[0003] In order to overcome the deficiencies in the background technique, the utility model discloses a horizontal active drainage system for saturated loess slopes. By arranging a water seepage pipe in the drill hole on the slope surface, a filter layer and a hole sealer are arranged on the water seepage pipe, and a vacuum pump is arranged on the hole sealer, so as to achieve the purpose of actively pumping water to solve the poor water permeability of the loess and quickly stabilize the slope.

[0004] In order to achieve the purpose of the utility model, the following technical scheme is adopted:

[0005] A horizontal active drainage system for saturated loess slopes includes a drill hole arranged on the slope surface. A water seepage pipe is arranged at the bottom of the drill hole. A filter layer is wrapped on the side surface of the water seepage pipe. A hole sealer is arranged at one end of the water seepage pipe close to the slope surface. One end of the hole sealer is connected to the water seepage pipe. A push rod is arranged at the end of the hole sealer connected to the water seepage pipe. The push rod is arranged in the water seepage pipe. The other end of the hole sealer is exposed outside the drill hole. A vacuum pump is arranged at the exposed end of the hole sealer.

[0006] Water seepage holes are distributed on the side surface of the water seepage pipe. One end of the water seepage pipe far from the hole sealer is blocked. Water seepage holes are arranged at the blocked end of the water seepage pipe. Internal threads are arranged on the inner wall of the other end of the water seepage pipe.

[0007] At least one group of limiting plates is distributed in the water seepage pipe. Each group of limiting plates consists of two. The limiting plates are of an arc-shaped structure. The concave surfaces of the two limiting plates are arranged opposite to each other. Struts are distributed between the limiting plates and the inner wall of the water seepage pipe. The struts are evenly arranged in an array.

[0008] The filter layer is a non-woven geotextile, and the non-woven geotextile is attached to the side surface and the blocked end of the water seepage pipe.

[0009] One end of the hole plugging device is provided with an external thread, and the hole plugging device is threadedly connected to the water seepage pipe. The side surface of the hole plugging device is provided with spiral blades, and one end of the hole plugging device close to the water seepage pipe is provided with a baffle plate.

[0010] The baffle plate is distributed with water permeable holes, and one end of the baffle plate facing the water seepage pipe is provided with a push rod.

[0011] One end of the push rod is connected to the baffle plate, and the other end of the push rod passes through two opposite limiting plates. The diameter of the push rod is greater than the distance between the two opposite limiting plates.

[0012] The horizontal active drainage system for saturated loess slopes described in the present utility model has strong practicability and is very convenient to use. By setting a filter layer on the water seepage pipe, the filter layer is closely attached to the drilling wall, and there is no free face on the drilling wall, avoiding the reduction of soil strength caused by hole collapse and the accumulation of fine particles; spiral blades are arranged on the hole plugging device to achieve a good hole plugging effect; the vacuum pump on the hole plugging device actively pumps water to solve the poor water permeability of loess, resulting in a large influence range of a single well, a short drainage period, and a quick effect on stabilizing the slope. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the positional relationship of the present utility model;

[0014] Figure 2 It is a cross-sectional view of the water seepage pipe of the present utility model;

[0015] Figure 3 It is a top view of the hole plugging device of the present utility model;

[0016] In the figure: 1, slope surface; 2, drilling hole; 3, water seepage pipe; 4, filter layer; 5, water seepage hole; 6, push rod; 7, hole plugging device; 8, support rod; 9, limiting plate; 10, baffle plate; 11, water permeable hole; 12, spiral blade. Detailed Embodiment

[0017] The present utility model can be explained in detail through the following embodiments. The purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model.

[0018] Combined with the attached Figures 1 to 3 A horizontal active drainage system for saturated loess slopes includes a drilling hole 2 arranged on a slope surface 1. The drilling hole 2 forms an angle of 10° with the ground, the bottom of the drilling hole 2 is higher than its opening, a water seepage pipe 3 is arranged at the bottom of the drilling hole 2, a filter layer 4 is wrapped on the side surface of the water seepage pipe 3, one end of the water seepage pipe 3 close to the slope surface 1 is provided with a hole plugging device 7, one end of the hole plugging device 7 is connected to the water seepage pipe 3, a push rod 6 is arranged at the end of the hole plugging device 7 connected to the water seepage pipe 3, the push rod 6 is arranged inside the water seepage pipe 3, the other end of the hole plugging device 7 is exposed outside the drilling hole 2, and a vacuum pump is arranged at the exposed end of the hole plugging device 7.

[0019] The side of the water seepage pipe 3 is distributed with water seepage holes 5. One end of the water seepage pipe 3 away from the hole plugging device 7 is blocked, and the blocked end of the water seepage pipe 3 is provided with water seepage holes 5. The water in the loess layer enters the water seepage pipe 3 through the water seepage holes 5, and the inner wall of the other end of the water seepage pipe 3 is provided with internal threads.

[0020] At least one group of limiting plates 9 is distributed in the water seepage pipe 3. Each group of limiting plates 9 consists of two. The limiting plates 9 are of arc-shaped structures, and the concave surfaces of the two limiting plates 9 are arranged opposite to each other. Struts 8 are distributed between the limiting plates 9 and the inner wall of the water seepage pipe 3. The struts 8 are equally spaced and arrayed. One end of each strut 8 is connected to the convex surface of the limiting plate 9, and the other end of the strut 8 is connected to the inner wall of the water seepage pipe 3.

[0021] The filter layer 4 is a non-woven geotextile, and the non-woven geotextile is attached to the side and the blocked end of the water seepage pipe 3. The filter layer 4 filters out fine soil particles.

[0022] One end of the hole plugging device 7 is provided with external threads. The hole plugging device 7 is threadedly connected to the water seepage pipe 3. A spiral blade 12 is provided on the side of the hole plugging device 7. The spiral blade 12 is screwed into the soil body on the wall of the drilling hole 2 to achieve a good hole plugging effect. A baffle 10 is provided at one end of the hole plugging device 7 close to the water seepage pipe 3.

[0023] The baffle 10 is distributed with water permeable holes 11. The water in the water seepage pipe 3 enters the hole plugging device 7 through the water permeable holes 11. A push rod 6 is provided at one end of the baffle 10 facing the water seepage pipe 3.

[0024] One end of the push rod 6 is connected to the baffle 10, and the other end of the push rod 6 passes through the two opposite limiting plates 9. The diameter of the push rod 6 is greater than the distance between the two opposite limiting plates 9. The push rod 6 passes through each group of limiting plates 9. The side of the push rod 6 abuts against the concave surfaces of the two limiting plates 9. Each strut 8 causes the water seepage pipe 3 to expand outwards, pressing the filter layer 4 tightly against the inner wall of the drilling hole 2.

[0025] For the horizontal active drainage system for water-saturated loess slopes described in the embodiment, during use, a drilling hole is constructed on the slope surface 1. The drilling hole 2 forms an angle of 10° with the ground, and the bottom of the drilling hole 2 is higher than its opening. The non-woven geotextile filter layer 4 is wrapped outside the drilling hole 2 and sent to the bottom of the drilling hole 2. The drilling rig is used to drive the hole plugging device 7 to screw the spiral blade 12 into the soil body on the wall of the drilling hole 2 to achieve a good hole plugging effect. As the hole plugging device 7 drills in, the baffle 10 pushes the push rod 6 to pass through each group of limiting plates 9. The side of the push rod 6 abuts against the concave surfaces of the two limiting plates 9. Each strut 8 causes the water seepage pipe 3 to expand outwards, pressing the filter layer 4 tightly against the inner wall of the drilling hole 2. There is no free face on the hole wall, avoiding soil collapse and reduction of soil strength caused by the accumulation of fine particles. The exposed end of the hole plugging device 7 is installed with a vacuum pump. When the vacuum pump is started, under the action of negative pressure, the water in the soil passes through the filter layer 4 to filter out fine soil particles, enters the water seepage pipe 3 through the water seepage holes 5, passes through the water permeable holes 11 on the baffle 10 of the hole plugging device 7 and is discharged by the vacuum pump. The vacuum pump actively pumps water to solve the problems of poor water permeability of loess, large influence range of a single well, short drainage period, and quick effect on stabilizing the slope.

[0026] The parts not detailed in this utility model are prior art. Although this utility model is specifically shown and introduced in combination with the preferred implementation schemes, there are many methods and ways to specifically implement this technical solution. The above is only the preferred implementation mode of this utility model. However, those skilled in the art should understand that various changes can be made to this utility model in terms of form and details without departing from the spirit and scope of this utility model defined by the appended claims, and all of them fall within the protection scope of this utility model.

Claims

1. A horizontal active drainage system for a saturated loess slope, comprising a borehole (2) arranged on a slope surface (1), a seepage pipe (3) arranged at the bottom of the borehole (2), a filter layer (4) wrapped around the side of the seepage pipe (3), and a hole sealer (7) arranged at one end of the seepage pipe (3) close to the slope surface (1), characterized in that: One end of the hole sealer (7) is connected to the seepage pipe (3); the end of the hole sealer (7) connected to the seepage pipe (3) is provided with a push rod (6); the push rod (6) is arranged in the seepage pipe (3); the other end of the hole sealer (7) is exposed outside the drilled hole (2); and a vacuum pump is provided at the exposed end of the hole sealer (7).

2. The horizontal active drainage system for saturated loess slope according to claim 1, characterized in that: The seepage pipe (3) is provided with seepage holes (5) on its side, one end of the seepage pipe (3) away from the hole sealer (7) is blocked, the blocked end of the seepage pipe (3) is provided with seepage holes (5), and the inner wall of the other end of the seepage pipe (3) is provided with internal threads.

3. The horizontal active drainage system for saturated loess slope according to claim 2 is characterized in that: At least one group of limit plates (9) is distributed in the seepage pipe (3), each group of limit plates (9) consists of two limit plates (9), the limit plates (9) are of an arc-shaped structure, the inner concave surfaces of the two limit plates (9) are arranged opposite to each other, support rods (8) are distributed between the limit plates (9) and the inner wall of the seepage pipe (3), and the support rods (8) are distributed in an equidistant array.

4. The horizontal active drainage system for saturated loess slope according to claim 1, characterized in that: The filter layer (4) is a non-woven geotextile, which is attached to the side and the blocking end of the seepage pipe (3).

5. The horizontal active drainage system for saturated loess slope according to claim 2, characterized in that: One end of the hole sealer (7) is provided with an external thread, the hole sealer (7) is threadedly connected to the seepage pipe (3), a spiral blade (12) is provided on the side of the hole sealer (7), and a baffle (10) is provided at one end of the hole sealer (7) close to the seepage pipe (3).

6. The horizontal active drainage system for saturated loess slope according to claim 5, characterized in that: The baffle plate (10) is provided with water-permeable holes (11) distributed thereon, and a top rod (6) is provided at one end of the baffle plate (10) facing the water seepage pipe (3).

7. The horizontal active drainage system for saturated loess slope according to claim 6, characterized in that: One end of the push rod (6) is connected to the baffle (10), and the other end of the push rod (6) passes through two opposite limit plates (9). The diameter of the push rod (6) is greater than the distance between the two opposite limit plates (9).

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