Device and method for deep drainage hole overlapping combined hole protection in deep and thick layer landslides

Abstract

The invention discloses a deep-thick landslide body deep drainage hole overlapping combined hole protection device and method. The water inlet component (1) includes a hard plastic water filter pipe (1.1), a geotextile (1.2), a guide cap (1.3) and Pipe clamps (1.4), fixed with pipe clamps (1.4) between the rigid plastic water filter pipes (1.1) described in the adjacent two sections, and using geotextiles (1.2) to cover the rigid plastic water filter pipes ( 1.1), the said geotextile (1.2) is wound and fixed with a nylon rope; the hard plastic water filter pipe (1.1) described in the first paragraph is covered with a cone-shaped guide cap (1.3), and the guide The cap (1.3) is connected with the hard plastic water filter pipe (1.1) by means of a socket; it overcomes the shortcomings of the prior art, such as the difficulty in installing the protection device in the hole, the phenomenon of pipe jamming and broken pipe, and has the ability to improve the protection in the hole. The installation rate of the device in place ensures the drainage effect of the drainage hole and increases its service life.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering landslide protection and control, and more specifically relates to a deep-thick landslide body deep drainage hole overlapping combined hole protection device and method. Background technique [0002] Implementing drainage holes in the slide body is a widely used landslide disaster prevention method at home and abroad. The purpose of effectively improving the stability of landslides can be achieved by draining the groundwater in the landslide body through drainage holes and reducing its water level significantly in a short period of time. In view of the characteristics of low cost, flexible maneuverability, and convenient construction of drainage holes, drainage hole technology has been applied in many landslide projects, and has achieved good control effects, especially for landslide projects induced by groundwater, and its effect is more significant. [0003]...

AI Technical Summary

Problems solved by technology

[0009] The actual construction shows that when the drainage pipe is pushed and installed, there will often be multiple wall holes in the front flower pipe section and the residual objects on the wall of the drilling hole (such as local raised rocks). Due to the rough hole wall, the quality of the hole is poor and the bite High force, frequent tube jams

[0010] (3) If it is difficult to push and install the protective device in the hole, or the pipe is stuck during the actual construction of the drainage hole, it is necessary to repeatedly pump and adjust. Once the pumping force is not properly controlled, it will cause the connection of the plastic filter pipe or U-PVC drainage pipe or The pipe body itself breaks, which leads to a series of problems such as the scrapping of the drainage hole, the obstruction of the construction progress, and economic losses.

[0011] 2. The drainage holes have poor drainage effect and are prone to failure

[0012] (1) Engineering practice has shown that the drainage effect of drainage holes is generally not good when using conventional protection measures in holes to drain water on creeping large deformation landslides

Compared with plastic water filter pipes, U-PVC drainage pipes have low porosity and poor drainage effect, making it difficult to drain groundwater in landslides in time

Although the plastic water filter pipe has a large porosity and good drainage effect, due to the lack of anti-filter protection on the outside, a large amount of crushed soil and particles are deposited in the plastic water filter pipe during the operation of the drainage hole, making it gradually lose its function, resulting in drainage holes. fail

[0013] (2) Due to the difficulty in pushing the protection device in the hole, its installation depth is difficult to meet the design requirements, and the hole depth cannot be extended into the permeable stratum, resulting in poor drainage effect

On the other hand, during the operation of the drainage hole, the section of the drilled hole where the protection device in the hole is not installed in place is very prone to shear failure due to the large deformation of the landslide, resulting in drainage failure, seriously shortening its service life, and resulting in high maintenance costs in the later period

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