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首页> 外文期刊>Acta Geotechnica: An International journal for Geoengineering >Field study of monotonic and cyclic lateral behaviour of piles in soft soils improved with and without vacuum preloading
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Field study of monotonic and cyclic lateral behaviour of piles in soft soils improved with and without vacuum preloading

机译：软土地区桩单调和循环行为的田间研究，但没有真空预加载

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摘要

Project Oufei is the largest individual reclamation project in Wenzhou city, China, and the main infrastructure consists of seawalls, sluices and separation dikes. These infrastructures face repeated horizontal forces from wind and waves; thus, it is essential to evaluate the lateral bearing of single pile used for sluice gates. This paper presents a case study on lateral monotonic and cyclic behaviour of bored piles in soft soils. Four instrumented piles were loaded monotonically and cyclically to assess the contribution of soil improvement by vacuum preloading with prefabricated vertical drains. The test results show that the ultimate horizontal capacities were 200 kPa and 100 kPa for piles in the treated zone and untreated zone, respectively, under monotonic loading and up to 220 kPa and 120 kPa for piles in the treated zone and untreated zone, respectively, under cyclic loading, indicating that the ultimate horizontal capacity of piles in the treated zone can meet the design requirement of 130 kPa. Moreover, soil improvement decreased the maximum bending moment of the bored piles and enhanced the pile head stiffness, and the influence depth of soil improvement is up to 10 m. This indicates that soil improvement by vacuum preloading with prefabricated vertical drains is effective and can be used for lateral loading in reclamation project.
机译：项目Oufei是温州市中最大的个人填海工程，主要基础设施包括海堤，闸门和分离堤防。这些基础设施面临来自风和波的横向力;因此，必须评估用于闸门闸门的单桩的横向轴承。本文介绍了软土中钻孔桩侧单调和循环行为的案例研究。四个仪器桩单调，并在循环地加载，以评估土壤改善对预制垂直排水的真空预加载的贡献。测试结果表明，在处理区和未处理区内的桩和未处理区内的桩和未处理区内的桩和未处理区内的桩和未处理区内的桩和100kPa分别为100kPa，均有最终水平容量分别为200kPa，分别为200kpa，分别为120kPa，在循环载荷下，表明经过处理区内桩的最终水平容量可以满足130 kPa的设计要求。此外，土壤改善降低了钻孔桩的最大弯矩，增强了桩头刚度，土壤改善的影响深度高达10米。这表明使用预制垂直排水管的真空预加载的土壤改善是有效的，可用于回收项目中的横向载荷。

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