滨海软土地区综合管廊基坑开挖钢板桩支护性状分析

发布时间：2018-04-26 00:05

本文选题：综合管廊 + 基坑开挖　；参考：《水利与建筑工程学报》2016年06期

【摘要】：采用PLAXIS 2D对比分析了基坑开挖过程中钢板桩支护体系的土压力、钢板桩水平位移、钢板桩弯矩、基坑周边地表沉降以及支撑轴力等。结果表明:随着基坑的开挖,主动侧土压力减小,在内支撑处应力集中,在开挖较浅时主被动土压力相对静止土压力改变均不大,被动土压力在基坑开挖时每一步的开挖面上有增大的趋势;钢板桩最大的水平位移增加和弯矩增量均在最后开挖步产生,最后的开挖步为综合管廊基坑开挖的关键和最危险步;基坑地表沉降随着开挖逐渐发展,最后一步开挖依然是沉降变形最大的关键施工阶段;支撑轴力表现为一道支撑轴力一直增加,两道支撑时第二道支撑会超越第一道支撑成为主支撑。
[Abstract]:The earth pressure, horizontal displacement, bending moment, ground subsidence and supporting axial force of steel sheet pile support system in excavation process of foundation pit were analyzed by PLAXIS 2D. The results show that with the excavation of the foundation pit, the active lateral earth pressure decreases and the stress concentration at the inner support is concentrated. When excavation is shallow, the active and passive earth pressure changes little relative to the static earth pressure. The passive earth pressure tends to increase on the excavation surface of each step of excavation, the maximum horizontal displacement and bending moment increment of steel sheet pile are generated in the final excavation step, and the final excavation step is the key and most dangerous step of the excavation of the comprehensive pipe gallery foundation pit. With the gradual development of excavation, the last step of excavation is still the most critical stage of settlement and deformation, and the supporting axial force is always increasing. When two supports, the second support will surpass the first support to become the main support.
【作者单位】：福州大学环境与资源学院;
【基金】：福建省自然科学基金项目(2013J01159) 交通运输部建设科技项目(201331849A130) 福建省交通运输科技发展项目(201242)
【分类号】：TU473.1

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