研究目的：本文主要针对郴宁公路万华岩右幅隧道(在建)浅埋段受地表水泥厂石灰石长胶带输送廊道交叉跨越施工影响，研究分析在初期支护条件下隧道掌子面发生早期坍塌的原因，后期状况下通过钢架支护试验类比和支撑近似分析两种方法得到冒顶最终发生的原因; 从经济技术和风险方面对后期隧道加固方案进行探讨; 最后针对隐藏风险，提出合理避险，减少损失。
研究结论：对于上下近临( 接) 施工，必须遵照有关建设程序报批; 同期施工双方在本文情况下，应遵循先下后上、先重后轻的施工顺序; 对初期支护状态下的濒临冒顶的全～强风化围岩、大跨浅埋隧道应优先采用地表注浆方案，以确保人员安全和方案最终实施。
Research purposes:For reducing the impact of the cross － over construction of the long belt surface conveyance corridor for limestone of the cement plant on the shallow － buried section of the right tunnel of the Wanhuayan Tunnel ( under construction) of Chenzhou － Ningyuan Highway，the study was done and the analysis is made for the causes for the collapse of the working face of the tunnel in early stage under the conditions of initial support，and the causes for the roof collapse are found out by means of test analogue of steel frame support and approximate analysis of supports under the condition． of the reinforcement for the tunnel in later stage． The discussion is made on the reinforcement scheme for the tunnel in later stage from the aspects of economy，technology and risk．Finally，aiming at the hidden risks，the reasonable measures are offered for avoiding the risks to reduce loss．
Research conclusions: The adjacent ( interface) constructions of the corridor and tunnel from above must be reported for approval according to relevant construction procedure． For the synchronical constructions，the construction sequences of " the engineering at lower place before the engineering at high place" and " important engineering before ordinary engineering" should be followed．For the shallow tunnel that its roof will collapse under the initial support due to the full～heavy weathered surrounding rock and long－span in，the surface grouting should be conducted first to ensure the safety of person and final implementation of the option．
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