True Triaxial Rock Disturbance Testing for Long-Duration Dynamic Loading
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Solution Overview
Problem
Existing technologies fail to efficiently address the challenges of existing technologies in the field of deep rock mechanical test, and in particular the field of a true triaxial time-dependent dynamic disturbance test device for a time-dependent dynamic disturbance test, and in the field of a true triaxial time-dependent dynamic disturbance test device for a deep-buried hard rock, specifically involving the technical problem of a true triaxial stress state, specifically involving the technical problem of a tunnel boring machine (TBM) in a tunnel boring machine (TBM) in a tunnel boring machine (TBM) excavation mode, where the surrounding rock is affected by a disturbance stress leading to delayed rupture and the need for a closed-loop servo control working method, and the technical problem of a direct control method, and the technical problem of a tunnel boring machine (TBM) in a tunnel boring machine (TBM) excavation mode, where the surrounding rock is affected by a disturbance stress leading to delayed rupture and the need for a closed-loop servo control working method.
Innovation Solution
A true triaxial time-dependent dynamic disturbance test device for a deep-buried hard rock, including a test sample basic platform with a hydrostatic pressure chamber, a rigid loading system, and an interlocking rigid clamp assembly, which applies wide-amplitude-frequency dynamic disturbance stresses in different true triaxial main stress directions to simulate the true disturbance stress state of the deep engineering rock, and a closed-loop servo control system to dynamically control the disturbance process, reducing power consumption and simulating time-dependent related rock dynamic rheological mechanisms under different surrounding rock stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If existing disturbance rock mechanics test machine is used, then high-frequency disturbance can be applied, but continuous test duration is limited to 5-10 minutes due to power consumption and performance constraints
Solution Approach 1:
The test machine is divided into multiple independent loading systems: a static loading system and multiple dynamic disturbance loading systems. Each dynamic disturbance loading system can operate independently, allowing sequential or parallel testing without requiring all systems to run simultaneously at full capacity, thereby extending continuous test duration while managing power consumption.
Solution Approach 2:
The system employs adjustable frequency and amplitude dynamic disturbance loading that can be modified during testing. The dynamic disturbance loading systems can adjust their operating parameters to match the actual testing requirements, optimizing power consumption while maintaining the ability to apply high-frequency disturbances when needed for extended durations.
2Reliability
If static force is used to apply disturbance stress, then rock mechanical properties can be researched, but the test cannot capture time-dependent dynamic effects such as high-frequency fatigue crack opening and closing
Solution Approach 1:
The system replaces static disturbance loading with dynamic disturbance loading systems that can apply time-dependent forces with adjustable frequency and amplitude. This enables the simulation of high-frequency fatigue effects, crack opening and closing, and other time-dependent dynamic phenomena while maintaining accurate measurement of rock mechanical properties through coordinated static and dynamic loading.
Solution Approach 2:
The dynamic disturbance loading systems apply periodic forces with controllable frequency and amplitude to simulate cyclic disturbance stresses. This periodic action captures the time-dependent dynamic effects including high-frequency fatigue crack opening and closing, energy storage and release, and changes in ductility and brittleness characteristics that static loading cannot reveal.
3Duration of action of moving object
If multiple dynamic disturbance loading systems are added to extend test duration, then time-dependent dynamic disturbance can be simulated, but device complexity increases
Solution Approach 1:
The testing system is segmented into modular independent units: a static loading system and multiple dynamic disturbance loading systems. Each module can be independently controlled and operated, allowing the system to achieve extended test durations through sequential or parallel operation of individual modules without requiring complete redesign of the entire system, thus managing complexity while extending capability.
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 device achieves long time-dependent static and disturbance stress coupled application control of the rock in the true triaxial disturbance stress state, suitable for deep mine rock masses and deep-buried tunnel engineering surrounding rocks, allowing for the observation of compression deformation, rupture information, and time-dependent dynamic disturbance mechanical behavior, and the establishment of a hard rock true triaxial dynamic constitutive model, with reduced power consumption and increased test efficiency.
Implementation Method 1
a hydrostatic pressure chamber, the hydrostatic pressure chamber forms a closed cavity structure
Implementation Method 2
the rigid static load loading assemblies include a first rigid static load loading assembly and a second rigid static load loading assembly, and the rigid dynamic load loading assemblies include a first rigid dynamic load loading assembly and a second rigid dynamic load loading assembly
Implementation Method 3
the interlocking rigid clamp assembly includes four test sample clamps, the test sample clamps (12) includes a first test sample clamp (12a), a second test sample clamp (12b), a third test sample clamp (12c) and a fourth test sample clamp (12d), the first test sample clamp and the third test sample clamp are arranged oppositely on two sides of the rock test sample in the σ1 principle stress loading direction, the second test sample clamp and the fourth test sample clamp are arranged oppositely on two sides of the rock test sample in the σ2 principle stress loading direction, and the four test sample clamps are mutually slidingly connected in an interlocking manner
Data Source
AI summary
A true triaxial time-dependent dynamic disturbance test device for a deep-buried hard rock includes a rigid static load loading assembly and a rigid dynamic load loading assembly. The rigid static load loading assembly applies a static load to a rock test sample, and the rigid dynamic load loading assembly applies a disturbance stress to the rock test sample. Coupled application and control of a long time-dependent static force and a disturbance stress of the rock in a true triaxial disturbance stress state are achieved. The rigid dynamic load is provided with a disturbance rod in a loading direction, and a “point” disturbance mode is converted into a “face” disturbance mode through the disturbance rod, a disturbance hole and a test sample clamp, so that a disturbance mode more suitable for an actual working condition on site is provided while power consumption is reduced and time-dependent dynamic disturbance is achieved.