Fault Stick-Slip Simulation System for Tunnel Engineering
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Solution Overview
Problem
Current experimental devices for simulating fault stick-slip displacement in tunnel engineering are complex, costly, and pose safety hazards, failing to accurately replicate natural seismic waves and resulting in unreliable data for tunnel construction in active tectonic regions.
Innovation Solution
An experimental system comprising a model box system and a stick-slip loading system, utilizing a first and second loading assembly with rock mass samples to simulate horizontal and vertical loading forces, mimicking the shear stick-slip effect of rock mass discontinuities, which allows for precise simulation of fault displacements such as strike-slip, normal, and reverse fault scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-sensitive micro-explosive device is used to simulate fault stick-slip displacement, then the pulse-type ground motion can be generated, but the experimental system becomes complicated, costly, and unsafe
Solution Approach 1:
The patent replaces the complex micro-explosive device with a simplified mechanical loading system consisting of a loading device, sample frame, and rock mass samples. This mechanical substitution eliminates the need for explosives while achieving the same stick-slip displacement effect through controlled mechanical loading and friction between rock samples.
Solution Approach 2:
The patent uses simple, inexpensive rock mass samples that can be easily replaced rather than expensive and complex explosive devices. The rock samples serve as consumable elements that can be swapped between experiments, reducing overall system cost and complexity.
2Reliability
If a micro-explosive device is used to simulate fault stick-slip displacement, then ground motion can be generated, but the seismic wave characteristics differ from natural earthquakes
Solution Approach 1:
The patent changes the fundamental mechanism from explosive pressure waves to mechanical friction-based stick-slip motion. By controlling the loading rate, normal force, and friction characteristics of rock samples, the system generates seismic waves with accurate P-wave onset and phase characteristics that match natural earthquake waves.
Solution Approach 2:
The patent creates a more accurate copy of natural seismic waves by using rock-on-rock friction that replicates the actual fault mechanics. Instead of copying the effect through a different mechanism (explosions), it copies the actual physical process of stick-slip displacement between rock masses along a fault.
3Ease of operation
If a loading device directly acts on hanging wall or foot wall to generate shear slip, then fault displacement can be simulated, but the near-fault pulse-type ground motions differ significantly from actual seismic waves
Solution Approach 1:
The patent introduces rock mass samples as intermediary elements between the loading device and the fault walls. These samples transmit the loading force through friction-based stick-slip motion, creating realistic pulse-type ground motions that accurately represent near-fault seismic waves while maintaining ease of operation.
Solution Approach 2:
The patent implements dynamic loading through controlled stick-slip motion of rock samples rather than static or purely artificial loading. The system captures the dynamic characteristics of actual earthquakes including acceleration pulses and velocity changes that occur during fault rupture propagation.
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 provides high-precision and reliable experimental data on the effects of fault stick-slip displacement on tunnel engineering, reducing costs by using jacks as loading devices and allowing for flexible sample replacement based on geological conditions, effectively simulating near-fault pulse-type ground motions and their impact on tunnel structures.
Implementation Method 1
The main loading rock mass sample is configured to provide a vertical loading force for a first wall under an action of the first loading device
Implementation Method 2
The second loading assembly provides a horizontal loading force for the main loading rock mass sample through the sub-loading rock mass samples
Implementation Method 3
a loading device directly acts on a hanging wall or a foot wall to generate a shear slip between the hanging wall and the foot wall
Data Source
AI summary
An experimental system for simulating the effect of a fault stick-slip displacement on a tunnel engineering includes a model box system and a stick-slip loading system. The model box system is configured to simulate an interaction between two walls of a fault. The stick-slip loading system includes a first loading assembly, a second loading assembly and a bearing assembly. The first loading assembly includes a first loading device, and a first sample frame configured to place a main loading rock mass sample. The bearing assembly is arranged on two sides of the first sample frame. Sub-loading rock mass samples borne by the bearing assembly are configured to abut against the main loading rock mass sample under the action of the second loading assembly. A method for simulating the effect of a fault stick-slip displacement on a tunnel engineering based on the above system is further provided.