In-situ Borehole Shear Test Device for Rock-Soil Mass
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Solution Overview
Problem
Current methods for determining the shear strength of rock-soil mass are inaccurate due to stress release during sample collection, and there is a lack of devices for in-situ shear testing of holes in rock-soil mass, making it difficult to assess slope stability and foundation strength effectively.
Innovation Solution
An in-situ shear test device for holes in rock-soil mass, comprising an axial loading system, cutting power system, rotation system, upper cutterhead control system, and shear test system, which allows for radial pressure loading and multi-point testing with minimal disturbance, enabling accurate measurement of shear strength parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rock-soil mass samples are collected for indoor direct shear tests, then shear strength parameters can be obtained, but stress release during sample collection disturbs the rock-soil mass and introduces error
Solution Approach 1:
The invention extracts the testing function from the laboratory environment and places it directly in the borehole. The shear test device is inserted into the borehole to perform tests in-situ, eliminating the need to extract rock-soil samples and thereby avoiding stress release disturbance during sample collection and transportation.
Solution Approach 2:
The invention introduces a specialized borehole shear test device as an intermediary tool that enables direct testing within the borehole. This device includes cutting tools to create shear surfaces, loading systems to apply shear force, and measurement systems to record shear strength parameters, all integrated into a single in-situ testing apparatus.
2Measurement precision
If in-situ shear test device for holes in rock-soil mass is developed, then accurate in-situ shear strength parameters can be obtained, but device complexity increases
Solution Approach 1:
The borehole shear test device integrates multiple functions into a single apparatus: cutting tools for creating shear surfaces, axial loading systems for applying shear force, radial loading systems for confining pressure, rotation systems for advancing the device, and measurement systems for data collection. This multi-functionality reduces the need for multiple separate devices while maintaining measurement precision.
Solution Approach 2:
The device employs a nested structure where the upper cutterhead and lower cutterhead are positioned along the borehole axis, with cutting tools, loading systems, and measurement instruments nested within the cutterhead assemblies. The entire testing apparatus is inserted into the borehole, with components arranged concentrically and axially to maximize space utilization and minimize overall device complexity.
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 facilitates convenient and representative in-situ shear testing in deep rock-soil masses, allowing for precise measurement of shear strength parameters with reduced disturbance, supporting improved engineering design and safety.
Implementation Method 1
the axial loading system includes a lower pressure cylinder
Implementation Method 2
pressure sensors are arranged on the upper cutting tool, the lower cutting tool, and the pressure block
Data Source
AI summary
An in-situ shear test device for holes in rock-soil mass include an axial loading system, a cutting power system, a rotation system, an upper cutterhead control system, a shear test system, and a lower cutterhead control system, which belongs to the field of geotechnical engineering and geological engineering technology. The device can accurately obtain the in-situ shear strength parameters in the hole of rock and soil, improve the engineering design level, and ensure the safety and stability of the project. The device adopts an in-situ shear test device in the hole of rock and soil mass with the above structure, which can solve the problems of difficulty in in-situ shear test for the holes in deep rock-soil mass, lack of test device, difficulty in radial test, difficulty in loading while shearing, and difficulty in multi-point in-situ test.