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STUDY ON SAFE NET DISTANCE AND ROCK STABILITY OF UNSYMMETRICAL PRESSURE LARGE SPAN NEIGHBOURHOOD TUNNEL
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摘要: 结合魁歧偏压错台大跨小净距隧道，采用ANSYS有限元软件建立三维数值模型，通过分析围岩位移、等效塑性应变以及中间岩柱安全系数随净距的变化，综合确定魁歧隧道最小净距为0.55倍最大毛洞开挖跨度是安全的。分别采用CRD法、双侧壁导坑法模拟隧道开挖过程，采用3种不同中间岩柱支护参数，研究不同围岩条件下隧道围岩稳定性。研究结果表明，CRD法在对隧道拱腰、边墙处围岩水平变形控制较为有利，而双侧壁导坑对隧道顶部围岩的变形控制有利。预应力锚杆对控制围岩水平变形最为有效，软弱围岩小导管注浆加固效果较好。Abstract: According to construction of Kuiqi two bores and eight lanes tunnel with super-large section and span,a 3D mathematic model was setup using ANSYS software,it was analyzed the variation of tunnel rocks displacement,equivalent plastic strain and the safety factors with different net distances and determined the safety net distance of large span neighbourhood tunnels.In the process of tunnel excavation simulation,three support parameters of middle rock pillar were used to study the force and deformation characteristics of middle rock pillar under Ⅲ,Ⅳ and Ⅴ level surrounding rocks.The results provided scientific basis for support design,excavation method and strengthening method of large span neighbourhood tunnel.
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Key words:
- neighbourhood tunnel /
- safe net distance /
- rock stability /
- ANSYS numerical simulation
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