后注浆群桩基础施工期沉降–时间规律试验研究

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摘要开展京沪高速铁路群桩基础后注浆现场试验，分析注浆与未注浆群桩基础的长期沉降监测数据，研究深厚软土层中长大群桩基础在注浆与未注浆2种状态下的沉降发展规律及其沉降稳定时间，探讨后注浆作用对群桩沉降及其发展规律的影响机制。得出结论：对于深厚软土层中的长大群桩基础，桩侧注浆与桩端注浆对减小群桩沉降都有显著作用，桩端注浆对沉降的控制效果略优于桩侧注浆；在缩短群桩固结沉降时间方面，桩端压力注浆的效果更为稳定。桩侧与桩端全注浆群桩基础对沉降发展规律有明显改变。在深厚软土层中，相比角桩和边桩注浆，群桩全注浆更有利于控制沉降量，加快沉降稳定。

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	邹力1
	吴兴序1
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关键词 ：土力学, 后注浆, 群桩基础, 沉降

Abstract：Beijing—Shanghai high-speed railway field tests on post grouting of pile group foundation have been carried out. By analyzing the long-term settlement measured data of post grouting and non-grouting pile group foundation，the settlement development laws of post grouting and non-grouting long pile group foundation in deep soft soil have been researched. The stable time of settlement of pile group foundation are analyzed，and the influence mechanism of the post grouting effect on pile group settlement and its development laws are discussed. The conclusions are that both pile shaft grouting and pile end grouting have obvious function on the control of the settlement of long pile group foundation in deep soft soil；and the control effect of pile end grouting is superior to pile shaft grouting. For shortening time of consolidation settlement，the effect of pile end grouting is more stable. The development laws of settlement of all shaft grouting and end grouting pile group foundation have been changed obviously. Compared with corner pile grouting and side pile grouting，all pile group grouting is more beneficial to control the settlement and accelerate settlement stabilization.

Key words： soil mechanics post grouting pile group foundation settlement

引用本文:

邹力1，吴兴序1，马建林1，彭声应2. 后注浆群桩基础施工期沉降–时间规律试验研究[J]. 岩石力学与工程学报, 2010, 29(S2): 4033-4037.
ZOU Li1，WU Xingxu1，MA Jianlin1，PENG Shengying2. EXPERIMENTAL STUDY OF SETTLEMENT-TIME REGULARITY OF POST GROUTING PILE GROUP FOUNDATION DURING CONSTRUCTION PERIOD. , 2010, 29(S2): 4033-4037.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/4033

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