魏强,陈旭光,李鹏,刘茜茜,王阳

• 1:中国海洋大学海洋工程学院

摘要(Abstract)：

由于岛礁空间有限，且陆域吹填受制于海洋地质条件，因此亟需探求拓展岛礁空间的新方案。本文针对岛礁空间不足的现状，提出了建设岛礁隧洞的方案，并基于岛礁工程环境的特殊性，提出了珊瑚砂软弱地层的地表预注浆加固方法，并研发了控压式预注浆试验系统，开展了珊瑚砂软弱地层结构的地表预注浆扩散试验，得到了浆液运移扩散特性；通过优选注浆参数，开展了饱和条件下珊瑚砂层隧洞预注浆加固与未注浆的开挖力学模型试验，分析了围岩应力、地表沉降、涌水量的响应特征。研究结果表明：在珊瑚砂软弱地层中，浆液运移扩散距离同浆液水灰比和注浆压强均有正相关性，渗透系数在水灰比为2.0时突然增大；渗流条件下，隧洞1倍洞径处的围压受到开挖扰动的影响而增大；通过对比预注浆段和未注浆段试验结果，隧洞掘进过程中地表沉降值缩减了92.68%,涌水速率下降为0.3 mL/min。试验结论验证了岛礁环境中开挖隧洞的可行性，对于岛礁隧洞的预加固工程有一定的参考作用。

关键词(KeyWords)： 岛礁隧洞;预注浆;钙质珊瑚砂;浆液扩散模型;开挖扰动

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金委-山东联合基金项目(U2106224)资助~~

作者(Author): 魏强,陈旭光,李鹏,刘茜茜,王阳

DOI: 10.16441/j.cnki.hdxb.20220234

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