| 新型低扰动双向搅拌粉喷桩复合地基承载特性研究 |
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| 引用本文： | 钱利平,张腾飞,何广海,时洪斌,毛忠良.新型低扰动双向搅拌粉喷桩复合地基承载特性研究[J].路基工程,2022,0(5):86-91. |
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| 作者姓名： | 钱利平 张腾飞 何广海 时洪斌 毛忠良 |
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| 作者单位： | 1.中国铁路上海局集团有限公司苏州铁路工程建设指挥部，江苏苏州 215100 |
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| 基金项目： | 上海铁路局科研计划项目:连盐线软基加固路基试验段运营期沉降监测与反演分析研究（2021152）；中铁第五勘察设计院集团有限公司科技研发计划项目:高含水量铁路海相软土复合地基长期加固效果监测与评价（T5Y2021-C07）。 |
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| 摘 要： | 基于连云港灌云试验段现场试验和长期监测，分别对复合地基孔隙水压力、深层水平位移、桩土荷载分担及路基沉降进行分析，研究低扰动新型双向搅拌粉喷桩复合地基承载特性。结果表明:新型双向搅拌桩施工扰动影响范围为4～5倍桩径距离，且桩体0.5 m范围内土体强度先减弱后增强；智能化参数控制施工可显著提高桩身强度，桩土应力比可达3.0～4.0；该区域1.2 m桩间距布置在稳定性控制和经济性上具有较大优势。
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| 关 键 词： | 低扰动 双向搅拌桩 粉喷桩 复合地基 承载特性 智能控制 |
| 收稿时间： | 2022-08-24 |
Study on Bearing Characteristics of Composite Foundation of New Low-disturbance Bidirectional Mixing DJM Pile |
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| Abstract: | Based on field tests and long-term surveillance at Guanyun test section in Lianyungang, the pore water pressure, deep horizontal displacement, pile-soil load sharing and subgrade settlement of the composite foundation were analyzed respectively. The bearing characteristics of composite foundation of new low-disturbance bidirectional mixing DJM pile were studied,The results show that the construction disturbance range of the new bidirectional mixing DJM pile is 4 ~ 5 times of the pile diameter, and the soil strength in the range of 0.5 m from the pile body is weakened at first and then strengthened; the construction with intelligent parameter control can significantly improve the pile strength and the pile-soil stress ratio can reach 3.0~ 4.0; the arrangement of 1.2 m pile spacing in this area has great advantages in stability control and economy. |
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