In-Situ Foundation Soil Vibration Bench for Seismic Settlement Testing
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Solution Overview
Problem
Current methods for testing dynamic settlement of foundation soil are limited to indoor conditions and fail to accurately replicate in-situ conditions, particularly in loess areas prone to seismic subsidence.
Innovation Solution
An in-situ dynamic settlement test bench and method involving drilling column holes, embedding sensors, and applying vibrational loads through a vibration table to measure acceleration and displacement responses in foundation soil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indoor dynamic testing apparatus (triaxial, torsional shear, simple shear) are used to test dynamic settlement of loess, then controlled laboratory conditions are provided, but in-situ conditions cannot be fully replicated
Solution Approach 1:
The testing system is segmented into multiple independent components: vibration table for horizontal loading, vertical loading system for vertical stress, sensor arrays for measurement, and data processing systems. This segmentation allows each component to be optimized for its specific function while collectively replicating complex in-situ seismic conditions that cannot be achieved in traditional indoor apparatus.
Solution Approach 2:
The invention transitions from traditional one-dimensional or two-dimensional indoor testing to a multi-dimensional in-situ testing system that simultaneously applies horizontal and vertical loads, measures three-dimensional displacement and acceleration, and captures data at multiple depths and locations, thereby replicating the complex stress state of actual foundation soil during earthquakes.
2Ease of manufacture
If traditional indoor testing apparatus are used, then testing can be conducted in controlled environments, but the complexity of in-situ testing conditions cannot be achieved
Solution Approach 1:
The vibration table serves multiple functions: it generates horizontal seismic waves, applies controlled vibration amplitude, and can test different soil depths. The sensor array system simultaneously measures displacement, acceleration, and velocity at multiple points. This multi-functionality reduces the need for multiple separate testing systems while achieving comprehensive in-situ condition replication.
Solution Approach 2:
The patent introduces intermediary elements such as the vibration table as a mediator between the testing system and the foundation soil, and sensor arrays as intermediaries for data collection. These intermediaries simplify the overall system by providing standardized interfaces for applying loads and measuring responses, making the complex in-situ testing process more manageable.
3Adaptability or versatility
If vibration table with eccentric wheels is used to apply horizontal vibrational load, then in-situ seismic effects can be simulated, but device complexity increases
Solution Approach 1:
The vibration table utilizes eccentric wheels driven by an electric motor to generate horizontal vibrational loads that simulate seismic effects. The eccentric wheels convert rotational motion into oscillating linear motion, creating realistic seismic wave patterns. This mechanical vibration approach directly addresses the need to simulate in-situ seismic conditions while keeping the vibration generation mechanism relatively simple and well-understood.
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
Enables accurate measurement of seismic settlement deformation in foundation soil under in-situ conditions, facilitating disaster prevention and control.
Implementation Method 1
two eccentric wheels are symmetrically arranged on both sides of the base, which are driven by an electric motor
Implementation Method 2
a vibration table is positioned... The vibration table comprises a base that is firmly connected to a vibration table foundation by means of bolt assembly
Implementation Method 3
Multiple sets of displacement and acceleration sensors are uniformly distributed within each hole, arranged from top to bottom
Data Source
AI summary
An in-situ dynamic settlement test bench and method for the foundation soil is provided. The in-situ dynamic settlement test bench includes a vibration table system, a sensor embedded in the foundation soil, and a water injection trench around the foundation soil. A horizontal vibration load is applied to the lower foundation soil at an in-situ testing site by means of a vibration table, and the dynamic response of the foundation soil is measured through the sensors embedded in different positions, to reflect the seismic settlement deformation of the soil body. Dynamic settlement tests on soils include indoor dynamic simple shear, triaxial and torsional shear tests. A method is proposed for measuring the dynamic response and settlement deformation of the foundation soil by using a vibrator's vibration action on an in-situ soil column. Measurements of the acceleration response and seismic settlement deformation are taken for the foundation soil under in-situ condition.