Residential Foundation Lifting with Layered Grouting Reinforcement
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Solution Overview
Problem
The uneven settlement of residential building foundations due to weak soil properties, particularly in areas with compressible soil layers and high water tables, leads to negative friction, lateral deformation, and structural instability, affecting the performance and safety of pile foundations.
Innovation Solution
A method involving stratigraphic exploration, curtain reinforcement, shallow and deep layer reinforcement, and grouting to form an integral raft composite foundation, using a progressive layered reinforcement process to stabilize and lift the foundation, enhancing bearing capacity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pile foundation is used in poor soil conditions, then bearing capacity is improved, but negative friction and lateral deformation occur causing pile failure
Solution Approach 1:
The patent applies preliminary grouting reinforcement to the soil layers surrounding the pile foundation before the pile is loaded. By pre-improving the soil properties through grouting, the negative friction and lateral deformation are reduced in advance, preventing pile failure before it occurs. This preliminary action addresses the contradiction by preparing the soil environment to support the pile foundation reliably.
Solution Approach 2:
The patent changes the physical and mechanical parameters of the soil layers by injecting grouting materials. The grouting process alters the soil density, strength, and friction characteristics, transforming the poor soil conditions into improved soil that can support the pile foundation without causing negative friction or lateral deformation that would lead to failure.
2Adaptability or versatility
If raft foundation is used for high-rise buildings, then adaptivity to low bearing capacity soil is improved, but uneven settlement occurs due to poor soil properties
Solution Approach 1:
The patent applies local quality improvement by selectively grouting specific soil layers and zones around the raft foundation. Different grouting parameters and approaches are used for different locations and soil layers, targeting the specific areas causing uneven settlement. This localized treatment improves the adaptivity of the foundation to poor soil while reducing differential settlement through precise, location-specific soil reinforcement.
3Strength
If grouting pressure is increased to improve lifting effect, then bearing capacity is improved, but building structure may be damaged
Solution Approach 1:
The patent employs dynamic grouting pressure control, adjusting the pressure in real-time based on soil conditions, building weight, and lifting progress. The pressure is not fixed but varies dynamically throughout the grouting process, increasing when needed for bearing capacity and decreasing when approaching structural limits. This dynamic approach maximizes the lifting effect while preventing structural damage through continuous adaptation to changing conditions.
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 stabilizes the foundation, reduces settlement rates, and forms a composite foundation that meets settlement stability requirements, ensuring the structural integrity and safety of the building.
Implementation Method 1
a grouting pressure and slurry proporation are properly adjusted on the settlement side to continuously fill and compact the soil layer of foundation with the slurry
Implementation Method 2
with the increase of the density and the pressure, the soil layer of foundation generates a lifting force
Implementation Method 3
the retreating layered reinforcement of the soil around the original pile is started, to increase the friction resistance of the soil around the pile
Data Source
AI summary
An engineering method for reinforcing and lifting a sunken foundation of a residential building includes stratigraphic structure, conducting a curtain reinforcement, reinforcing and strengthening a shallow layer, reinforcing a deep layer, steadily lifting an intermediate layer, and reinforcement supports of the composite foundation, the shallow layer reinforcement and strengthening adopts a progressive layered reinforcement process, the foundation slab of the building is reinforced with grouting to form the reinforcement body of an integral raft composite foundation. A support of the composite foundation similar to the pile foundation is constructed under four corners of the building and under the main load-bearing walls of the room. A structure supporting the upper load is formed through repeated retreating and progressive grouting.