Elastic Box Clamp for True-Triaxial Rock Testing
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Solution Overview
Problem
Existing rock mechanics testing systems, particularly true-triaxial testing systems, face challenges in achieving stable and accurate stress measurements due to the complexity of rock sample clamps, which often require cumbersome operations and can affect the uniformity of stress distribution across the sample surfaces.
Innovation Solution
A clamp system comprising six pressing plates and eight L-shaped plate springs, forming a hexahedral structure, which allows for hexahedral stiff loading and enables rapid unloading of principal stresses, thereby simplifying the mounting process and ensuring accurate stress distribution across the rock sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional stiff-soft composite loading clamp is used, then the clamp can provide loading capability, but the operation process becomes complicated and sealant uniformity is compromised
Solution Approach 1:
The clamp is divided into six independent pressing plates, each capable of applying stress to a specific face of the cubic specimen. This segmentation allows each plate to be independently controlled and adjusted, simplifying the operation process while ensuring uniform stress distribution across all faces without requiring complex sealant application procedures.
Solution Approach 2:
The invention extracts and eliminates the need for sealant coating by using a rigid cubic clamp structure with six pressing plates that directly apply stress to the specimen faces. This removes the complicated sealant application step entirely while maintaining stress uniformity through the rigid framework and precise plate positioning.
2Reliability
If a stiff clamp is used, then the clamp provides stable loading, but it cannot realize rapid unloading of principal stresses
Solution Approach 1:
The clamp system incorporates dynamic control capabilities through independently controllable pressing plates that can be rapidly adjusted or released. This dynamic design allows the system to maintain stable loading during compression tests while enabling rapid unloading when needed, such as during rock burst testing, by quickly releasing stress on specific faces of the specimen.
Solution Approach 2:
The division into six independently controllable pressing plates enables selective and rapid unloading of principal stresses. Each plate can be independently released to unload stress on its respective face, allowing rapid stress removal without compromising the stability of other loaded faces, thus achieving both stable loading and rapid unloading capabilities.
3Adaptability or versatility
If a sliding clamp is used, then the clamp can accommodate stress changes, but adjacent surfaces are affected when one surface stress is changed
Solution Approach 1:
The clamp is segmented into six independent pressing plates, each responsible for a specific face of the cubic specimen. This segmentation allows stress to be applied or adjusted on one face without affecting the stress state of adjacent faces, as each plate operates independently. This maintains precise stress distribution uniformity while adapting to different stress states required for various testing conditions.
Solution Approach 2:
Each pressing plate provides localized stress control on its respective face, allowing independent adjustment of stress magnitude and direction for each face. This local quality control ensures that stress changes on one surface do not propagate to adjacent surfaces, maintaining uniform stress distribution while adapting to complex stress state requirements.
4Manufacturing precision
If cushion blocks are used in traditional clamps, then the clamp provides stress distribution, but the mounting process becomes complicated
Solution Approach 1:
The invention removes the cushion blocks from the clamp structure and replaces them with six pressing plates that directly contact and apply stress to the specimen faces. This extraction eliminates the complicated mounting process associated with cushion block installation and adjustment, while the pressing plates maintain uniform stress distribution through their rigid construction and precise positioning capabilities.
Solution Approach 2:
The pressing plates replicate the stress-distributing function of cushion blocks but with superior precision and ease of operation. Instead of using soft cushion blocks that require careful installation and adjustment, the rigid pressing plates provide the same stress distribution function through precise mechanical contact and independent control, simplifying the mounting process while maintaining or improving stress distribution uniformity.
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 clamp system ensures stable and accurate stress measurements by simplifying the mounting process, maintaining the stability of the clamp, and allowing for precise adjustment of the rock sample within the testing machine, thereby enhancing the accuracy and reliability of rock burst test research.
Implementation Method 1
eight L-shaped plate springs, which are fixed at one end to the pressing plates and at the other end to the hexahedral empty box structure
Data Source
AI summary
Provided is a clamp of elastic box of stiff true-triaxial testing system and a displacement monitoring method for cuboid specimens. The clamp includes six pressing plates and eight plate springs, which form an elastic pressure box. One surface of the elastic pressure box can be disassembled, which simplifies the steps of rock sample mounting, and saving the mounting time. The springs connected with the pressing plates ensures the stability of the clamp but cannot affect the stress state of other surfaces of the rock sample during the test of the rock sample, thereby ensuring test accuracy. The invention further provides a displacement monitoring method for the rock sample by using the elastic box clamp. Six displacement sensors are mounted on the elastic box clamp, and the displacement of the rock sample can be monitored in real time.