Rock Mass Anchor Bolt Test System for Combined Pull-Twist-Shear Loading
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Solution Overview
Problem
Existing test systems for full-size rock mass anchor bolts under combined loads face challenges in applying complex loads effectively, particularly in simulating the combined stress of pull, shear, and twist, which is crucial for accurately assessing anchoring performance, due to the large size of simulation rock masses and the tendency of anchor bolts to fail at fracture interfaces.
Innovation Solution
A test system comprising a primary frame with a co-directional pull-twist loading mechanism and a vertical shear loading mechanism, allowing for synchronous and separate application of pull, twist, and shear loads, enabling comprehensive mechanical performance testing of anchor bolts under combined stress conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the full-size anchor bolts (20-30mm diameter, yielding strength >300 MPa) are tested in a laboratory, then the test results can reflect the actual engineering performance, but the size of the simulation rock mass becomes large making it difficult to apply complex loads effectively
Solution Approach 1:
The loading system is divided into three independent loading mechanisms: pull loading mechanism, twist loading mechanism, and shear loading mechanism. Each mechanism can independently apply its specific load type to the rock mass, allowing complex combined loads to be applied through coordinated operation of multiple simplified subsystems rather than requiring a single complex loading device
Solution Approach 2:
The test system integrates multiple loading functions (pull, twist, shear) into a single universal testing platform. The primary frame supports all three loading mechanisms, and the coordinated control system can apply any combination of loads, making the system versatile for testing anchor bolts under various combined stress conditions that simulate real engineering scenarios
2Reliability
If the anchor bolts are tested under combined loads to simulate real working conditions, then the anchoring performance assessment becomes accurate, but the structure of the test system becomes complex with mutual restrictions between different loading functions
Solution Approach 1:
The loading system is divided into three independent loading mechanisms: pull loading mechanism, twist loading mechanism, and shear loading mechanism. Each mechanism can independently apply its specific load type to the rock mass, allowing complex combined loads to be applied through coordinated operation of multiple simplified subsystems rather than requiring a single complex loading device
Solution Approach 2:
The primary frame serves as an intermediary structure that supports and coordinates all three loading mechanisms. The controlled coordination system acts as a mediator that synchronizes the operation of pull, twist, and shear loading mechanisms, enabling them to work together seamlessly without mutual interference while maintaining individual functionality
3Reliability
If the anchor bolts are anchored into large-size rock masses to simulate surrounding rocks, then the test conditions reflect actual engineering scenarios, but it becomes difficult to apply pull, twist, and shear loads simultaneously at the same bonding interface
Solution Approach 1:
The test system integrates multiple loading functions (pull, twist, shear) into a single universal testing platform. The primary frame supports all three loading mechanisms, and the coordinated control system can apply any combination of loads, making the system versatile for testing anchor bolts under various combined stress conditions that simulate real engineering scenarios
Solution Approach 2:
The primary frame serves as an intermediary structure that supports and coordinates all three loading mechanisms. The controlled coordination system acts as a mediator that synchronizes the operation of pull, twist, and shear loading mechanisms, enabling them to work together seamlessly without mutual interference while maintaining individual functionality
Data Source
AI summary
The present disclosure provides a test system and method for an anchoring performance of a full-size rock mass anchor bolt under combined load and relates to the technical field of detection test equipment. The system includes a primary frame, a co-directional pull-twist loading mechanism and a vertical shear loading mechanism. The primary frame includes a dual-parallel horizontal reaction frame and a vertical reaction frame. The co-directional pull-twist loading mechanism and the vertical shear loading mechanism are arranged in synergy with the primary frame. The co-directional pull-twist loading mechanism performs synchronous pull and twist loading for the anchored rock mass and the vertical shear loading mechanism applies a static load or simulates a dynamic load disturbance. The co-directional pull-twist loading mechanism and the vertical shear loading mechanism perform separate loading. By using the test system, anchor bolt pull test, pull-twist test of the anchor bolt body, pull-twist-shear test of the anchor bolt body and test of the anchor bolt and the anchored rock mass are performed and also a coupled load of pull, shear and twist is performed on a same anchored fracture surface to effectively test the comprehensive mechanical performance of the anchor bolt member in the rock mass under combined stress.