Self-starting Siphon Drainage for Slope Groundwater
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Solution Overview
Problem
Conventional slope drainage methods are ineffective in managing groundwater levels, leading to landslide disasters, due to high energy consumption, maintenance requirements, and cost, with existing systems like surface drainage ditches, pumping wells, and horizontal drainage holes being inefficient and prone to blockages.
Innovation Solution
A self-starting negative pressure drainage system comprising a declined borehole with a permeable drilling section and a sealed grouting section, using a water-expanding rubber stop ring and a drain pipe with a PA pipe, which creates a siphon effect to efficiently discharge groundwater without frequent maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pumping wells are used for slope drainage, then groundwater can be discharged, but high energy consumption and high operational cost occur
Solution Approach 1:
The drainage system utilizes the siphon effect to automatically discharge groundwater without requiring external power sources. The system self-starts when groundwater level rises and automatically stops when the level drops, eliminating the need for continuous energy input while maintaining reliable drainage functionality
Solution Approach 2:
The invention employs hydraulic principles by using the siphon effect - a hydraulic phenomenon where liquid flows through a tube over an elevation difference driven by pressure differential. This hydraulic mechanism replaces electric pumping, achieving energy-free groundwater discharge while maintaining drainage reliability
2Ease of manufacture
If horizontal drainage holes are used for natural drainage, then construction is simple, but blockage easily occurs due to small inclination
Solution Approach 1:
The invention uses an asymmetric borehole configuration where the drainage hole is drilled at a specific inclination angle (15°-45°) rather than horizontally. This asymmetric angle ensures sufficient gravitational force for water flow while maintaining construction simplicity, preventing blockage while preserving ease of installation
Solution Approach 2:
The system changes the key parameter of borehole inclination from horizontal (0°) to a specific range (15°-45°). This parameter modification prevents blockage by ensuring adequate flow velocity while keeping the construction process simple and straightforward
3Reliability
If underground drainage holes are used, then drainage can be achieved, but construction period is long and cost is high
Solution Approach 1:
The invention extracts and applies the essential functional element (siphon drainage mechanism) from complex underground drainage systems. By using a single inclined borehole with siphon piping rather than extensive underground drainage networks, it achieves effective groundwater discharge while dramatically reducing construction time and cost
4Ease of manufacture
If surface drainage ditches are used, then construction is simple, but drainage effectiveness cannot be ensured
Solution Approach 1:
Instead of draining surface water as conventional ditches do, the invention inverts the approach by drilling through the slope to discharge groundwater directly. This inverted methodology combines the simplicity of surface-level construction with the effectiveness of deep groundwater interception
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables real-time continuous drainage of deep slope groundwater, reducing landslide risks with low construction and maintenance costs, high reliability, and independence of each drainage hole, allowing for rapid construction and operation without power or regular management.
Implementation Method 1
a water stop ring made of water-expanding rubber is provided between the permeable drilling section and the sealed grouting drilling section
Implementation Method 2
utilizing a water-expanding rubber stop ring and a drain pipe with a PA pipe, which creates a siphon effect to efficiently discharge groundwater without frequent maintenance
Data Source
AI summary
A self-starting negative pressure drainage system for draining groundwater in a slope, includes: a declined borehole, a pipe boot, a permeable pipe and a drain pipe; wherein the declined borehole is divided into a permeable drilling section and a sealed grouting drilling section; wherein the permeable drilling section is on a lower portion of the declined borehole, and the sealed grouting drilling section is on an upper portion of the declined borehole; a water stop ring made of water-expanding rubber is provided between the permeable drilling section and the sealed grouting drilling section; the permeable drilling section comprises the permeable pipe; a top of the permeable pipe contacts the water-expanding rubber; a cavity is formed in the permeable pipe, an inlet of the drain pipe passes through the water stop ring made of water-expanding rubber and is inserted into the permeable pipe.