Horizontal-Vertical Drain Board Vacuum Preloading for Soft Soil
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Solution Overview
Problem
Vacuum preloading using vertical drain boards in soft foundation treatment faces issues with structural stability, vacuum transitivity, and soil consolidation, as the drain boards tend to bend and clog, leading to nonuniform reinforcement and poor drainage efficiency.
Innovation Solution
A horizontal-vertical drain board-flocculation vacuum preloading method that uses a reinforced frame system with transverse and vertical reinforcements, electro-osmotic drainage, and flocculation to stabilize the soil and improve drainage efficiency, preventing drain board bending and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vertical drain boards are used in vacuum preloading, then drainage efficiency is improved and consolidation time is shortened, but the drain boards bend and clog, leading to poor vacuum transitivity and nonuniform consolidation
Solution Approach 1:
The invention divides the single vertical drainage system into a combined horizontal-vertical drainage system. Multiple transverse drain boards are installed at different depths (every 2-3 meters) working together with vertical drain boards to create a segmented drainage network, preventing overload on individual components and improving overall system reliability
Solution Approach 2:
The invention transitions from a one-dimensional vertical drainage approach to a two-dimensional horizontal-vertical combined drainage system by introducing transverse drain boards at multiple levels, creating additional drainage pathways in the horizontal dimension to complement the vertical drainage action
2Speed
If vertical drain boards are used, then consolidation speed is increased, but structural stability deteriorates as drain boards bend under load
Solution Approach 1:
The long vertical drain boards are divided into multiple shorter segments by installing transverse drain boards at intervals every 2-3 meters. Each segment is shorter and less prone to bending, while the segments work together through the horizontal drainage boards to achieve rapid overall consolidation
Solution Approach 2:
The invention provides different drainage functions at different locations: vertical drain boards handle deep-seated drainage, while transverse drain boards at various depths provide localized horizontal drainage and structural support, creating a differentiated drainage system that addresses both speed and stability requirements
3Productivity
If vacuum pumping is applied, then water discharge is enhanced, but fine particles enter the filter membrane and clog the drain board
Solution Approach 1:
The invention introduces horizontal drain boards as intermediary drainage pathways between the soil and vertical drain boards. These transverse boards collect water horizontally before it reaches the vertical boards, reducing the velocity and preventing fine particles from being forced into the drainage system under vacuum pressure
Solution Approach 2:
By adding the horizontal drainage dimension, the system provides an alternative water discharge pathway that reduces the burden on vertical drain boards, thereby minimizing particle intrusion and clogging while maintaining effective water removal
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 method enhances structural stability, improves vacuum transitivity, and achieves better soil stabilization and drainage efficiency by forming a reinforced frame and using electro-osmotic drainage, while flocculation prevents soil from clogging the drain boards, ensuring thorough and efficient water discharge.
Implementation Method 1
vacuum preloading using vertical drain boards
Implementation Method 2
forming a pressure difference between the drain board and outside, so that the water in the earth body flows through the pores of earth body
Implementation Method 3
the electro-osmotic power supply is switched on, so that the positive and negative electrodes are formed in the combination of the vertical reinforcements, the water concentrates in the combination of vertical reinforcements connected to cathode
Implementation Method 4
A horizontal-vertical drain board-flocculation vacuum preloading sediment treatment method
Data Source
AI summary
A horizontal-vertical drain board-flocculation vacuum preloading sediment treatment method, including (1) electro-osmotic electrodes disposed on the top and bottom of each reinforcing bar of the reinforced frame; (2) after the sediment is blown to the bottommost layer of vacuum preloading tank, the support is fitted over each reinforced frame, and the clips are fastened; (3) the transverse drain board passes through the support, one end of transverse drain board is connected to a curved tube; (4) repeat Step 2 and Step 3 until the sediment is blown to the surface layer of vacuum preloading tank; (5) a vertical drain board is arranged vertically between two adjacent rows of reinforced frames; (6) the curved tube is connected to the first junction block through the second junction block, and then the geotextile and sealing film are laid, the vacuum pump and power supply are switched on at last.