基于颗粒流理论，建立分析砂固结预应力锚杆锚固性能的颗粒流数值分析模型。
Based on the theory of particle flow code (PFC), the numerical analysis model is established to study the anchorage mechanism of sand consolidated anchorage prestressed bolt.
大气量时应用偏心气锚安装气举阀与地面单流阀两步卸气，实现了下部产层和油套环空自动卸气。
Ortherwise, the eccentric gas anchor, gas lift valve and surface check valve are installed to automatically unload the gas from the deeper layer and annulus between the tubing and the casing.
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