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研究目的 :某新建铁路工程V级围岩条件下浅埋暗挖隧道,顶部有一座220KV双回高压铁塔未迁改,新建隧道开挖不可避免的会对顶部高压铁塔产生影响,为了研究新建隧道在实施过程中对高压铁塔的影响情况,利用有限差分软件FLAC3d,结合工程经验建立合理假设,建立了数值模型,分析隧道施工对高压铁塔沉降的影响规律,并预测其差异沉降量,从而采取针对性结构处理。研究结论 :(1)新建隧道施工对高压铁塔影响显著;(2)影响范围以铁塔为中心,隧道穿越铁塔段80米范围内影响大;(3)建议隧道施工中80米影响范围内采用机械开挖及地表注浆加固的处理措施,确保既有铁塔的安全;(4)本研究结论可供类似隧道穿越铁塔工程参考。
Research purposes: a new railway construction V grade rock under the conditions of shallow buried tunnel, top of a 220KV double-return high-voltage tower has not been changed, the new tunnel excavation will inevitably affect the top of the tower, in order to study the new tunnel In the process of implementation of the impact of high-voltage tower, the use of finite difference software FLAC3d, combined with engineering experience to establish reasonable assumptions, the establishment of a numerical model to analyze the impact of tunnel construction on the settlement of high-voltage tower, and predict the differential settlement, Sexual structure processing. The conclusions are as follows: (1) The construction of new tunnels has a significant impact on the high-voltage tower; (2) The impact scope is centered on the tower; the impact of the tunnel passing the tower section is 80m; (3) Excavation and surface grouting reinforcement measures to ensure the safety of the existing tower; (4) The conclusions of this study can be used for similar tunnel through the tower project reference.