多次分段注浆钢花管桩群结构抗滑性能模型试验研究

doi:10.13722/j.cnki.jrme.2018.1157

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摘要为了更好地研究多次分段注浆钢花管桩群结构防治新技术及其作用机制，采用现场大比例模型试验，研究多次分段注浆钢花管桩群的抗滑性能，讨论钢花管注浆效果、群桩效应及破坏模式。试验结果表明：采用多次分段控制注浆钢花管桩群结构加固边坡，在桩周边均形成“树根状”水泥柱复合抗滑体，这种结构可以有效提高桩周土体抗剪强度，有效增强钢花管桩群结构的抗滑性能。三排6.0 m桩长的多次分段注浆钢花管，比单排注浆钢花管水平抗滑力提高了1.1×104 N/根，群桩结构每根钢花管水平承载力相比单排钢花管提高约10.5%；三排桩群结构的钢花管均在滑面附近发生受弯破坏，建议在结构设计中加强滑面附近的桩体配筋设计，提高滑面附近的抗弯破坏能力，以达到更好的抗滑效果。

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	张玉芳1
	魏少伟1
	周文皎2
	李鼎伟3
	周滨3

关键词 ：桩基础, 钢花管, 多次分段注浆, 群桩效应, 抗滑性能

Abstract：In order to better study the prevention and control mechanisms of multi-stage grouting steel pile group， large scale field model tests were carried out to analyze the anti-sliding performance of multiple segmented grouting steel pile group from the aspects of soil pressure and bending of steel pipe. Grouting effect，pile group effect and failure mode were also discussed. The test results show that，while a slope is reinforced by multiple segmented grouting steel pile group，“root shaped” anti-sliding cement columns around the grouting steel piles form，which can efficiently enhance the strength of the soil around the piles and improve the anti-sliding ability of the pile group. The horizontal anti-sliding force of every pile of multiple segmented grouting steel pile group structure with three rows of pipes of 6.0 in length was 1.1×104 N larger than that of single row piles，and the lateral bearing capacity of single pile increases by about 10.5% considering the group pile effect. Because of tat the bending failure of every pile of pile group happens near the sliding surface，it is suggested that the reinforcement ratio of the piles near the sliding surface should be properly enhanced to improve the anti-sliding ability.

Key words： pile foundations grouting steel piles multiple segmented grouting pile group effect anti-sliding mechanism

引用本文:

张玉芳1，魏少伟1，周文皎2，李鼎伟3，周滨3. 多次分段注浆钢花管桩群结构抗滑性能模型试验研究 [J]. 岩石力学与工程学报, 2019, 38(5): 982-992.
ZHANG Yufang1，WEI Shaowei1，ZHOU Wenjiao2，LI Dingwei3，ZHOU Bin3. Model test study on anti-sliding behaviours of multiple segmented grouting steel pile group structure. , 2019, 38(5): 982-992.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1157 或 http://www.rockmech.org/CN/Y2019/V38/I5/982

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