Fault Dislocation Simulation Box for Tunnel Creep and Stick-Slip
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Solution Overview
Problem
Existing experimental systems for simulating fault dislocations in tunnel structures can only achieve creep or stick-slip dislocations separately and do not accurately reflect the relative motion of rock layers, leading to unreliable data and instability in cross-fault tunnel construction.
Innovation Solution
An experimental system comprising a model box with a friction effect layer, surrounding rock layers, and a fault dislocation loading system that simulates creep and stick-slip dislocations by adjusting the ratio of clay mineral to quartz sand in the friction layer, allowing for the transfer of dislocation effects to the tunnel structure model, and using hydraulic jacks to reduce costs and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If model boxes are used for physical simulation of fault dislocations, then creep or stick-slip dislocation can be achieved, but only one type of dislocation can be achieved at a time and the dislocation effect does not accurately reflect the relative motion of rock layers
Solution Approach 1:
The model box is segmented into multiple functional zones: a loading zone with independent loading devices for applying shear stress, a fault zone with a friction layer representing the fault plane, and an overlying rock zone. This segmentation allows independent control of loading conditions while maintaining realistic stress transfer, enabling separate simulation of creep and stick-slip dislocations with accurate rock layer motion representation.
Solution Approach 2:
The experimental system is designed as a universal platform that can simulate both creep and stick-slip dislocation types using the same model box structure. The loading devices can apply different stress regimes (continuous loading for creep, intermittent loading for stick-slip), and the friction layer composition can be adjusted to represent different fault conditions, making the system versatile for studying various fault dislocation mechanisms.
2Ease of operation
If loading devices directly act on surrounding rock-similar material, then dislocation effect can be applied, but the effect of relative motion of rock layers transferred to overlying surrounding rock is not reflected
Solution Approach 1:
A friction layer is introduced as an intermediary between the loading devices and the overlying surrounding rock-similar material. This friction layer represents the actual fault plane and mediates the stress transfer by frictional sliding, accurately simulating how relative motion between rock layers is transferred to the overlying rock mass. The loading devices apply force to the friction layer, which then transfers stress realistically to the surrounding rock through controlled frictional slip.
3Productivity
If existing experimental systems are used, then fault dislocation simulation can be performed, but the data reliability is poor due to inability to simulate both creep and stick-slip
Solution Approach 1:
The loading devices are designed to dynamically adjust loading rates and stress application patterns. For creep dislocation simulation, continuous slow loading is applied; for stick-slip simulation, intermittent rapid loading is applied. This dynamic control capability allows the same experimental system to reliably produce different dislocation types with appropriate data collection protocols for each, improving overall data reliability while maintaining experimental productivity.
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 effectively simulates both creep and stick-slip dislocations, enhancing the credibility and scientific relevance of experimental results, promoting the stability research of cross-fault tunnel engineering, and reducing experimental costs through a simple and efficient design.
Implementation Method 1
a friction effect layer, a first surrounding rock layer, a tunnel structure model, a second surrounding rock layer and an overburden pressure layer are sequentially arranged in the box structure from bottom to top
Implementation Method 2
the fault dislocation loading system may include a plurality of hydraulic power devices; tops of the plurality of hydraulic power devices abut against the third slide rail during an experiment
Implementation Method 3
the friction effect layer may include clay mineral and quartz sand; a weight ratio of the clay mineral to the quartz sand may be 1:1
Data Source
AI summary
An experimental system for simulating creep and stick-slip dislocations of a fault in a tunnel structure includes a box structure, a supporting device and a fault dislocation loading system. A friction effect layer, a first surrounding rock layer, a tunnel structure model, a second surrounding rock layer and an overburden pressure layer are sequentially arranged in the box structure from bottom to top. The bottom of the box structure is provided with a through hole. A plate assembly is provided on the through hole, and includes a first guide plate, a second guide plate and a loading plate. Inner sides of the first guide plate and the second guide plate are respectively provided with a first slide rail and a second slide rail. The loading plate moves along the first slide rail and the second slide rail under the action of the fault dislocation loading system.