1.武汉科技大学城市建设学院,湖北 武汉 430065
2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北 武汉 430071
3.自然资源部第二海洋研究所,浙江 杭州310012
4.桂林理工大学土木与建筑工程学院,广西 桂林 541004
李好强(1994—),男,硕士研究生。主要从事特殊土土力学与工程灾害防治研究。E-mail:1339624822@ qq.com
纸质出版:2022-02-28
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李好强,王勇,雷学文等.嘉甬跨海高铁大桥工程浅层气地质及灾害防治分析[J].防灾减灾工程学报,2022,42(01):216-223.
LI Haoqiang,WANG Yong,LEI Xuewen,et al.Engineering Geological Conditions and Shallow Gas Hazard Analysis of Jiayong Cross‑sea High‑speed Railway Bridge[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):216-223.
李好强,王勇,雷学文等.嘉甬跨海高铁大桥工程浅层气地质及灾害防治分析[J].防灾减灾工程学报,2022,42(01):216-223. DOI: 10.13409/j.cnki.jdpme.202004057.
LI Haoqiang,WANG Yong,LEI Xuewen,et al.Engineering Geological Conditions and Shallow Gas Hazard Analysis of Jiayong Cross‑sea High‑speed Railway Bridge[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):216-223. DOI: 10.13409/j.cnki.jdpme.202004057.
浅层气的存在严重影响海底地层的稳定性。嘉甬跨海高铁大桥修建前期,在对海盐西线位进行初勘过程中,桥位中心海域频繁遭遇浅层气。在勘探、物化试验分析等基础上,探讨了桥位浅层气富含区域的水文地质条件、地层沉积及浅层气分布和成因,分析了大桥工程建设各阶段可能遭遇的浅层气灾害及相应的防治措施。研究表明,该区域地层水主要为第四系松散岩类孔隙水,含气土层为第四系全新统至下更新统冲海相黏性土及砂土,其中砂土层为主要储气层,气体属于典型的未受重大次生作用影响的原生型早期生物成因气;提出跨海桥梁工程浅层气地质灾害的防治措施,可为浅层气海域的海洋工程防灾减灾提供参考。
The stability of the seabed stratum is significantly affected by the shallow marine gas. In the early construction stage of Jiayong Sea-crossing High-speed Railway Bridge, Jiangsu province, shallow gas is frequently encounted during the preliminary geological survey of the Haiyan West Line. Based on the geological exploration and physicochemical test analyses, this work discusses the hydrogeological conditions, stratigraphic sedimentary, and the distribution and genesis of the region bearing shallow gas of the bridge. Then, the shallow gas hazards that may be encountered in each construction stage of the bridge are analyzed and the corresponding prevention measures are proposed. The study shows that the formation water in this area is mainly composed of pore water that exists in the quaternary loose rock; the gas-bearing soil contains alluvial marine clay and the sandy soil of the quaternary Holocene to lower Pleistocene. Shallow gas mainly occurred in the sand layer, which is a typical type of native early biogas without being affected by major secondary effects. The preventive measures for the shallow gas geological hazards in different construction stages of the bridge are proposed, which can provide a reference for disaster prevention and mitigation of offshore engineering in marine shallow gas areas.
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