In-situ Rock Mass Elastic Modulus Measurement via Segmented Loading
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Solution Overview
Problem
Existing in-situ rock mass elastic modulus measurement devices are not suitable for hard rocks, have limited adaptability to soft geological conditions, are bulky, inconvenient to carry, and have low accuracy.
Innovation Solution
An in-situ rock mass elastic modulus measurement system that includes a controller, a telescopic rod, and a protective barrel with in-hole supporting structures, grinding pressure heads, and measurement pressure heads, which planish the borehole wall and apply planar compression to measure the elastic modulus accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a capsule is used to uniformly load a borehole wall, then the measurement is simple and quick, but the contact area is large and non-uniform resulting in low measurement accuracy
Solution Approach 1:
The loading system is divided into multiple independent loading units (first and second loading units) that can be positioned at different locations on the borehole wall. Each loading unit applies load independently through its own loading plate, allowing controlled contact areas while maintaining measurement speed.
Solution Approach 2:
The patent applies different loading configurations to different locations on the borehole wall. The first loading unit uses a first loading plate with a first contact area, while the second loading unit uses a second loading plate with a second contact area. This local differentiation allows optimization of both measurement speed and accuracy by adapting the contact characteristics to specific measurement requirements.
2Adaptability or versatility
If a strip-type rigid loading plate with cambered section is used, then point or line contact is achieved for anisotropic rock masses, but the contact area with curved borehole wall is small and non-uniform resulting in low measurement accuracy
Solution Approach 1:
The patent employs curved loading plates (first and second loading plates) that match the curvature of the borehole wall. This spherical/curved geometry ensures uniform contact area with the curved borehole surface, improving measurement accuracy while maintaining adaptability to anisotropic rock masses through the ability to position loading units at different orientations.
3Strength
If existing in-situ elastic modulus measurement device is used, then hard rock with high strength can be measured, but the device has large volume and is inconvenient to carry
Solution Approach 1:
The measurement device is segmented into multiple independent loading units (first and second loading units) that can be separately positioned and operated within the borehole. This segmentation allows the device to be more compact and easier to carry while maintaining the capability to measure hard rock through the coordinated action of multiple loading points.
4Productivity
If existing in-situ elastic modulus measurement device is used, then measurement can be performed, but the device is complicated in operation and has relatively low accuracy
Solution Approach 1:
The device is divided into independent loading units with standardized components (loading plates, support structures, measurement elements) that can be independently positioned and operated. This segmentation simplifies the operation process by allowing modular assembly and independent control of each loading unit, while maintaining measurement accuracy through precise control of contact areas and loading forces.
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 improves measurement accuracy, simplifies the measurement process, expands the application range to include hard rocks, and reduces construction costs by being more adaptable and efficient.
Implementation Method 1
the grinding pressure heads outwards grind the borehole wall through second through holes on the protective barrel
Implementation Method 2
the grinding pressure heads outwards grind the borehole wall
Implementation Method 3
A hydraulic oil cylinder is fixedly arranged on the feeding sliding plate; two ends of the hydraulic oil cylinder are provided with two hydraulic rods respectively
Implementation Method 4
the measurement pressure heads press a planished surface of the borehole wall
Implementation Method 5
A displacement sensor configured for detecting a relative displacement between the two measurement pressure heads is arranged on a cylinder body of the hydraulic oil cylinder
Implementation Method 6
the elastic modulus of the rock mass is calculated according to a relative displacement value of the two measurement pressure heads
Implementation Method 7
the elastic modulus of the rock mass is calculated according to a relative displacement value of the two measurement pressure heads under action of the measurement pressure heads
Data Source
AI summary
An in-situ rock mass elastic modulus measurement system includes a controller, a telescopic rod, and a protective barrel; the telescopic rod is fixedly connected to the protective barrel; in-hole supporting structures are arranged at upper and lower ends in the protective barrel which is internally fixedly connected with a base; the base is slidably connected with a feeding sliding plate which is driven by a feeding cylinder and provided with a right-angle transmission diverter, a driving motor, and a grinding cylinder; the diverter is in transmission connection with the driving motor; two ends thereof are connected with grinding pressure heads; the diverter is driven by the grinding cylinder to translate horizontally, and drives the grinding pressure heads to outwards grind a borehole wall; a hydraulic oil cylinder is fixedly arranged on the feeding sliding plate; a displacement sensor is arranged on a cylinder body of the hydraulic oil cylinder.