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分析了王家岭新井中央变电所深井软岩大断面硐室支护失效的机理,得出原岩应力、围岩岩性、支护强度和应力叠加是导致其断面收缩率高达40%的主要原因。通过现场试验,对比分析了锚网喷分别与钢筋梯子梁支护、U型棚和U型对棚+反底拱联合支护的效果,得出了控制底鼓是硐室稳定的关键。实践表明,锚网喷+U型对棚+反底拱联合支护有效地控制了中央变电所的围岩变形,消除了潜在的安全隐患。
The failure mechanism of large-area deep chamber of soft rock in Xinjiao Central Substation in Wangjialing is analyzed. It is concluded that the primary rock stress, the surrounding rock lithology, the support strength and the stress superposition are the main factors that lead to the reduction of the area up to 40% the reason. Through the field test, the effect of anchor-net spraying on the combined support of reinforced concrete ladder girder, U-shaped shed and U-shaped canopy + anti-back arch is analyzed and compared. It is concluded that the control of bottom drum is the key to the stability of chamber. Practice shows that the anchor net spray + U-type shed + anti-back arch joint support effectively control the central substation surrounding rock deformation, eliminating the potential security risks.