Rock Shear Testing Machine ZYYJ Series by SINOTEST
| Brand | SINOTEST |
|---|---|
| Origin | Jilin, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | ZYYJ Series |
| Pricing | Upon Request |
Overview
The SINOTEST ZYYJ Series Rock Shear Testing Machine is a precision-engineered geomechanical testing system designed for controlled direct shear and shear–compression testing of intact rock specimens, rock–concrete interfaces, rock–soil contacts, and discontinuous rock joints (e.g., bedding planes, fractures, faults). It operates on the principle of applying a vertical normal load followed by a horizontal shear force under displacement-controlled or load-controlled conditions, enabling quantitative determination of shear strength parameters—including peak and residual shear stress, cohesion (c), and internal friction angle (φ)—in accordance with standardized geotechnical test protocols. The machine supports both monotonic and stepwise shear loading, facilitating full stress–strain curve acquisition and post-peak behavior characterization essential for slope stability analysis, underground excavation design, and dam foundation evaluation.
Key Features
- Robust dual-actuator architecture: independent high-precision servo-hydraulic actuators for simultaneous and decoupled control of normal load (vertical) and shear force (horizontal), ensuring minimal cross-axis interference and high fidelity in multi-axial loading paths.
- Modular specimen chamber: accommodates standard rock core specimens (Ø50 mm × 100 mm, Ø70 mm × 140 mm) and irregular jointed samples via customizable shear boxes with adjustable confinement plates and alignment guides.
- High-resolution measurement system: integrated LVDTs and load cells with ≤0.25% FS accuracy for normal and shear force, and ≤1 µm resolution for vertical/horizontal displacement—enabling precise tracking of dilation, slip onset, and progressive failure.
- Stiffness-optimized frame: welded steel monocoque structure with ≥2 × 10⁶ N/mm axial stiffness, minimizing frame compliance and preserving true specimen response during high-strength rock testing (up to 300 MPa uniaxial compressive strength).
- Real-time synchronization: hardware-triggered data acquisition at up to 1 kHz sampling rate, capturing transient shear events such as stick–slip behavior and fracture propagation without aliasing.
Sample Compatibility & Compliance
The ZYYJ Series is validated for testing specimens conforming to ASTM D5607 (Standard Test Method for Performing Laboratory Direct Shear Strength Tests of Rock Specimens), ISO 14689-1 (Geotechnical investigation and testing — Identification and classification of rock — Part 1: Identification and description), and GB/T 50266–2013 (revised version of GB/T 50266-99, “Standard Test Methods for Engineering Rock Masses”). It also meets the mechanical and metrological requirements outlined in SL 264–2014 (“Technical Specifications for Rock Tests in Water Resources and Hydropower Engineering”). All transducers are traceably calibrated per ISO/IEC 17025 guidelines, and the system supports GLP-compliant test documentation through audit-ready metadata logging (operator ID, calibration certificate numbers, environmental conditions).
Software & Data Management
Control and analysis are executed via SINOTEST’s GeoTest Suite v4.x—a Windows-based application compliant with FDA 21 CFR Part 11 for electronic records and signatures. The software provides closed-loop PID control modes (displacement, load, or stress rate), automated test sequencing (e.g., normal load ramp → dwell → shear ramp), real-time plotting of τ–σ, τ–δh, and δv–δh curves, and batch export to CSV, Excel, and MTS-compatible formats. Built-in reporting templates generate ASTM/GB-compliant test reports with embedded calibration certificates, uncertainty budgets (per GUM), and pass/fail flags against specification limits. Audit trails record all user actions, parameter changes, and data exports with time stamps and digital signatures.
Applications
- Determination of Mohr–Coulomb failure envelope parameters for intact granite, basalt, sandstone, and shale.
- Interface shear characterization between concrete linings and host rock in tunneling projects.
- Shear behavior assessment of filled or unfilled natural joints under varying effective normal stresses (0.5–20 MPa range).
- Time-dependent shear creep testing under constant normal stress (optional add-on module).
- Validation of numerical models (e.g., UDEC, Phase2) using laboratory-derived joint roughness coefficient (JRC) and basic friction angle (φb) inputs.
FAQ
What rock types are compatible with the ZYYJ Series?
Intact crystalline rocks (granite, gneiss), sedimentary rocks (limestone, sandstone), metamorphic rocks (schist, quartzite), and engineered interfaces (rock–concrete, rock–grout) — provided specimens meet dimensional tolerances specified in GB/T 50266–2013.
Does the system support automated cyclic shear testing?
Yes — GeoTest Suite enables programmable multi-cycle shear protocols (e.g., forward–reverse displacement control) with variable amplitude and frequency, suitable for fatigue and hysteresis analysis.
Is third-party calibration certification included?
Each unit ships with an ISO/IEC 17025-accredited calibration certificate covering all load cells and displacement sensors, valid for 12 months from commissioning.
Can test data be integrated into LIMS or enterprise databases?
Yes — ODBC and REST API interfaces allow bidirectional data exchange with LabWare LIMS, SAP QM, and custom SQL-based QA systems.
What safety features prevent overloading or specimen ejection?
Hardware interlocks include pressure-relief valves, emergency stop circuits with mechanical cut-off, and real-time overload detection that halts motion if measured force exceeds 110% of setpoint.
