Drainage Anti-Slide Pipe Pile for Seepage Control in Expansive Soil
Solution Overview
Problem
Existing drainage anti-slide piles are inadequate for open channel projects in expansive soil slopes in cold and arid regions, failing to effectively manage seepage water levels that cause instability and landslides due to dry-wet-freeze-thaw cycles, leading to structural damage and landslides.
Innovation Solution
A drainage anti-slide ecological pipe pile with a dewatering section, embedded section, and pile cover, utilizing steel slag concrete and geomembranes, equipped with drainage channels and an automatic water pumping and drainage device to control seepage water levels, embedded in solid rock stratum for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-slide piles are used, then landslide control function is provided, but drainage and seepage water level control capability is insufficient
Solution Approach 1:
The patent merges the landslide control function of anti-slide piles with the drainage function of drainage piles into a single integrated structure. The pipe pile body simultaneously provides mechanical anchoring for slope stability and contains drainage channels for seepage water collection and discharge, resolving the contradiction between landslide control reliability and drainage adaptability.
Solution Approach 2:
The pipe pile is designed as a multi-functional structure that performs multiple functions: (1) landslide control through anchoring in stable stratum, (2) drainage through internal channels, (3) seepage water level control through regulated discharge, and (4) ecological protection through steel slag concrete. This universality directly addresses the insufficient drainage capability while maintaining landslide control.
2Quantity of substance
If box culvert water collection structure is provided at channel bottom, then some seepage water collection is achieved, but seepage water level control behind slope is poor
Solution Approach 1:
The patent transitions from horizontal water collection at channel bottom (box culvert) to vertical water collection through the slope body (pipe pile). The pipe pile extends vertically through the slope with drainage channels at multiple elevations, enabling three-dimensional water collection and level control behind the slope, which resolves the inadequate water level control problem.
Solution Approach 2:
The pipe pile acts as an intermediary structure between the seepage water behind the slope and the external drainage system. It collects seepage water through drainage channels, transports it through the pile body, and controls its discharge through regulated openings, thereby achieving reliable seepage water level control behind the slope.
3Adaptability or versatility
If drainage channels are increased in pipe pile, then drainage capability is improved, but structural strength and stability may be compromised
Solution Approach 1:
The pipe pile incorporates drainage channels with controlled porosity and opening ratios. The channels provide sufficient drainage capability while the controlled opening ratio (5%-15% of pile body cross-sectional area) maintains structural integrity. This resolves the contradiction between drainage capability and structural strength.
Solution Approach 2:
The pipe pile uses composite construction with steel slag concrete providing structural strength and embedded drainage channels providing drainage functionality. The composite structure allows the pile to simultaneously achieve high strength for structural stability and sufficient channel openings for effective drainage, resolving the contradiction between these two requirements.
4Ease of repair
If steel slag concrete is used, then ecological waste management is promoted, but manufacturing precision and material consistency may be affected
Solution Approach 1:
The patent specifies controlled parameter ranges for steel slag concrete to ensure material consistency: compressive strength ≥25MPa, water-cement ratio 0.4-0.6, and aggregate content 40%-60%. These parameter controls maintain manufacturing precision while utilizing steel slag for ecological waste management.
Solution Approach 2:
The steel slag concrete is used as a composite material combining recycled steel slag with cement and aggregate. This composite approach maintains structural strength and material consistency required for pipe pile construction while achieving ecological waste management benefits through steel slag utilization.
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
Effectively controls seepage water levels, enhances slope stability by timely water removal, and promotes ecological waste management through recycled steel slag concrete, reducing the risk of landslides and frost heave.
Implementation Method 1
a wall of the dewatering section of the pile body is provided with a plurality of drainage channels for consolidation drainage
Implementation Method 2
transfer the landslide thrust to the stable stratum by relying on the mutual clamping effect between the piles and the rock (soil) around the piles
Implementation Method 3
stabilizes the landslide by the anchoring effect and anti-slide force of the pile body embedded in the stable rock stratum
Data Source
AI summary
A drainage anti-slide pipe pile suitable for an open channel project of expansive soil in cold and arid regions and a construction method thereof are provided. The pipe pile includes a pile body, wherein the pile body is provided with a dewatering section and an embedded section arranged up and down, a wall of the dewatering section of the pile body is provided with a plurality of drainage channels for consolidation drainage; and the embedded section of the pile body is embedded in a solid rock stratum to provide an anti-slide effect. The drainage anti-slide pipe pile is more targeted at the expansive soil channel project in cold and arid regions, which can effectively control seepage water level behind a channel slope in an operational period, quickly reduces lagging dewatering level behind the slope in the initial stage of a shutdown period, and improves the stability of the entire slope.