灾害学2024，Vol.39Issue(4)：88-94,7.DOI:10.3969/j.issn.1000-811X.2024.04.013
复杂堆积体区导向井开挖及强卸荷裂隙高陡岸坡综合处治研究
Study on Guide-well Excavation in Complex Accumulation Area and Comprehensive Treatment of High-steep Bank Slope with Strong Unloading Cracks
摘要
Abstract
The Wanzhou Yangtze River Highway Bridge which boasted as the first Arch-bridge of the World needed to add anti-ship collision facilities due to the impoundment of the Three Gorges.As the key content of anti-collision facilities construction,the third guide-well is located on the bank of the accumulation body,affected by the reservoir water dissipation,the strong unloading and the reconstruction of the reservoir bank,it is difficult to excavate and support the accumulation body at the guide-well,and there is a high risk of instability of the 70m steep bank slope.In order to ensure the safety of guide-well construction and operation of the anti-collision facili-ties and the Yangtze River channel,according to the topography geology and tectonic hydrological characteristics of the project area,the stability of steep bank slope formed by the excavation is simulated and analyzed using FLAC 3D finite element software,the results show that the slope is unstable under the condition of excavation and rainstorm,shear stress concentration at the junction of sandstone,mudstone and fissure is obvious.Based on the results,the supporting scheme of anchor cable ground beam combined with slope jet sealing was adopted the reinforcement and removal scheme of the boulder accumulation were studied,combined with the reservoir water level fluctuation and the schedule,the local removal and membrance bag concrete protection scheme of the accu-mulation was adopted,ensured the safety construction of the third guide-well.关键词
复杂堆积体/崩塌孤石/卸荷裂隙/高陡岸坡/综合处治Key words
complex accumulation/collapse boulder/unloading crack/high steep bank slope/compre-hensive treatment分类
交通工程引用本文复制引用
冯玉涛,王伟桥,张景伟,刘宪庆,徐浩娟,吴红刚..复杂堆积体区导向井开挖及强卸荷裂隙高陡岸坡综合处治研究[J].灾害学,2024,39(4):88-94,7.基金项目
重庆市自然科学基金"复杂山区大型堆积体路基变形机制及应急修复关键技术"(CSTB2022NSCQ-MSX0263) （CSTB2022NSCQ-MSX0263）
重庆市技术创新与应用发展专项重点项目"山区道路长期服役性智能评价与提升技术研究及应用"(CSTB2022TIAD-KPX0102) （CSTB2022TIAD-KPX0102）
中国中铁股份有限公司科技研究开发计划"复杂环境路基建造与灾害防治施工技术"(2022-重大专项-07) （2022-重大专项-07）
