🔬 Study on Sealing Mechanism of Three-Stage Sealing Under Transient High-Pressure Gas Rock Breaking
Breaking
🌋 Introduction to High-Pressure Gas Rock Breaking
High-pressure gas rock breaking is an advanced non-explosive technique widely applied in mining, tunneling, and deep geological engineering. 🚧⚙️ This method relies on the rapid release of transient high-pressure gas to induce controlled fracturing of rock masses. However, the efficiency and safety of this process strongly depend on the performance of the sealing system, which prevents premature gas leakage and ensures optimal pressure buildup.
🧩 Concept of Three-Stage Sealing Technology
The three-stage sealing mechanism is designed to enhance confinement under extreme transient pressure conditions. 🔒 It typically consists of primary mechanical sealing, secondary expansion sealing, and tertiary adaptive sealing, each functioning at different pressure and deformation stages. Together, these layers work synergistically to resist gas escape and maintain stability during rock fracture initiation.
🛠️ Primary Sealing: Initial Pressure Containment
The first stage focuses on immediate mechanical contact between the sealing device and borehole wall. 🪨 This stage establishes the baseline gas barrier and ensures alignment under initial loading. Material stiffness, surface roughness, and installation precision are critical parameters influencing sealing integrity at this phase.
🔄 Secondary Sealing: Dynamic Expansion Response
As gas pressure rises rapidly, the second stage activates through elastic or plastic expansion mechanisms. 💨 This adaptive response compensates for micro-gaps and borehole irregularities caused by transient loading. The effectiveness of this stage is closely linked to material elasticity, pressure sensitivity, and response speed.
🧠 Tertiary Sealing: Adaptive Stability Under Fracture
The third stage provides intelligent self-adjustment during active rock fracturing. 🧱⚡ When cracks initiate and propagate, stress redistribution occurs around the borehole. The tertiary seal accommodates deformation, absorbs energy, and maintains contact, preventing sudden pressure loss during critical fracture moments.
📊 Sealing Performance Under Transient Conditions
Transient high-pressure environments introduce complex interactions between gas flow, seal deformation, and rock mechanics. ⏱️📈 This study highlights how the three-stage sealing system improves pressure retention, fracture efficiency, and operational safety compared to single-stage or conventional sealing methods.
🚀 Engineering Significance and Applications
Understanding the sealing mechanism under transient high-pressure gas rock breaking offers valuable insights for improving borehole design, sealing materials, and operational parameters. 🏗️🌍 The findings contribute to safer, more efficient, and environmentally friendly rock-breaking technologies for modern engineering applications.
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