Adjustable Shear Box for Rock Mass Cyclic Testing
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Solution Overview
Problem
Current shear box designs fail to accurately and reliably test cyclic shear characteristics of rock mass discontinuities with varying sizes, which is critical for evaluating seismic stability in engineering rock masses.
Innovation Solution
A shear box design featuring adjustable upper and lower semi-open cavities with isosceles trapezoid adjusting devices and pads, allowing for macro and fine adjustments to ensure seamless contact with rock samples of different sizes, thereby providing accurate cyclic shear strength parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-size shear box is used, then the structure is simple, but it cannot accommodate rock samples of different sizes
Solution Approach 1:
The shear box employs adjustable side walls that can be repositioned along the length of the box, transforming a static fixed-size structure into a dynamic variable-size structure. This allows the shear box to adapt to different rock sample dimensions while maintaining a relatively simple overall design framework.
Solution Approach 2:
The shear box is divided into modular components including adjustable side walls and a base plate that can be independently positioned. This segmentation enables flexible configuration of the shear box dimensions to match different sample sizes without requiring a completely different box design for each sample type.
2Reliability
If the shear box cannot be adjusted, then the structure is simple, but the contact between samples and inner walls is not seamless
Solution Approach 1:
The adjustable side walls can be positioned dynamically to match the specific dimensions of each rock sample, ensuring optimal contact between the sample and the inner walls. This dynamic adjustment capability improves test reliability by eliminating gaps and ensuring proper stress distribution, while the adjustment mechanism itself remains relatively simple.
3Measurement precision
If the shear box is not customized for different sizes, then manufacturing is easy, but test accuracy for cyclic shear characteristics is compromised
Solution Approach 1:
The shear box is constructed from modular segments including adjustable side walls and a base plate that can be manufactured separately and assembled together. This segmentation allows for easier manufacturing of individual components with standardized interfaces, while the overall system can be configured to accommodate different sample sizes to maintain test accuracy.
Solution Approach 2:
The shear box design incorporates universal adjustable components that can be used across multiple test configurations. The same basic shear box structure with adjustable side walls can accommodate various rock sample sizes, eliminating the need to manufacture separate shear boxes for each sample type while maintaining test precision.
Data Source
AI summary
A shear box for testing cyclic shear characteristics of a rock mass discontinuity includes: an upper shear box including an upper semi-open cavity composed of an upper left side plate, an upper right side plate, an upper front side plate, an upper rear side plate and an upper top plate; and a lower shear box including a lower semi-open cavity composed of a lower left side plate, a lower right side plate, a lower front side plate, a lower rear side plate and a lower bottom plate; the upper shear box includes at least one first adjusting device for adjusting a space size of the upper semi-open cavity; the lower shear box includes at least one second adjusting device for adjusting a space size of the lower semi-open cavity; and the upper shear box and the lower shear box are placed opposite to each other.