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隧道洞口施工地表预加固技术及应用

Keywords: 隧道,注浆,喷射注浆,锚杆

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Abstract:

根据隧道洞口围岩特点,阐述了隧道洞口施工原则和地表预加固技术及适用范围,总结隧道洞口地表预加固技术的应用和进展情况,并在楚雄至大理一级公路大风坝隧道中应用了该项技术,取得预期效果.通过地表预加固措施,可改善围岩物理力学性能,提高围岩的自稳性,缩小围岩松弛区范围,减小围岩对初期支护的压力.锚杆、注浆管可起到悬挂岩土体作用.超前注浆可加固充填坍塌体,封堵地表水下渗通道.

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