原状泥岩中模拟动力打桩与浸水静载试验研究

doi:10.13722/j.cnki.jrme.2022.0705

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摘要为深入研究泥岩地基动力打入桩的承载性能，考虑打桩过程和水对桩周泥岩力学性质的影响，开展室内模拟打桩与浸水静载模型试验、针贯入仪试验及电子放大镜试验，结合现场试验数据分析泥岩地基打入桩的沉贯特性与承载性能，明确桩周泥岩强度损伤特性。研究表明：(1) 泥岩不均匀性强，软硬互层现象显著，强度最大值与最小值相差约13.5倍，泥岩强度与打桩锤击数变化趋势具有同步性。(2) 软夹层处泥岩浸水后强度平均降低64.2%，静载试验沉降量大且破坏现象发生在泥岩软夹层处，陡降特征与现场试验结果一致。(3) 打桩损伤范围为2d(d为桩径)，桩周0～0.5d，0.5d～1.0d，1.0d～1.5d，1.5d～2.0d内泥岩强度平均值分别降低66%，40.5%，17%，7%。(4) 桩端泥岩存在挤密松弛现象，桩端处泥岩强度较桩周2d处增加11.1%，较桩身相同位置处平均增加194.5%。(5) 泥岩软硬互层的不均匀性是造成泥岩地基打入桩承载力问题的重要原因，岩土工程勘察容易忽略泥岩的互层性，认为泥岩总是比较均匀、稳定、强度随深度增加而增加，对这种现象应提高认识，予以重视。

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	白晓宇1
	2
	张亚妹1
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	银吉超1
	2
	王永洪1
	2
	桑松魁1
	2
	闫楠1
	2

关键词 ：桩基础, 动力打桩, 浸水静载试验, 原状泥岩, 针贯入试验, 损伤

Abstract：In order to study the bearing capacity of dynamic driving pile in mudstone foundation，the influence of driving process and water on the mechanical properties of mudstone is considered. The model tests of pile driving and static load，needle penetration test and electronic magnifying glass test were carried out. Combined with the field test data，the penetration characteristics and bearing capacity of the driven pile are analyzed，and the damage characteristics of mudstone around the pile are clarified. The results shows that：(1) the mudstone has strong heterogeneity，and the soft and hard interbedded phenomenon is significant. The maximum strength is 13.5 times of the minimum value，and the variation trend of mudstone strength and hammering number is synchronous. (2) The strength of the mudstone at the soft interlayer decreases by 64.2% on average after immersion，and the static load test is damaged by large settlement at the soft interlayer，and the steep drop characteristics are the same as the field test. (3) The damage range of pile driving is 2d(d is pile diameter). The strength of mudstone decreases by 66%，40.5%，17% and 7% on average in 0‐0.5d，0.5d‐1.0d，1.0d‐1.5d and 1.5d‐2.0d around the pile. (4) There is compaction relaxation phenomenon at the pile end. The strength of mudstone at the pile end is 11.1% higher than that at 2d around the pile，and 194.5 % higher than that at the same position of the pile. (5) Mudstone heterogeneity is the cause of mudstone pile bearing capacity problem，which is easy to be ignored in geologic investigation. It is considered that mudstone is always uniform，stable，and its strength increases with depth. This phenomenon should be recognized and paid attention to.

Key words： pile foundations driven piles submerged static load test undisturbed mudstone pin-penetration test damage

引用本文:

白晓宇1，2，张亚妹1，2，银吉超1，2，王永洪1，2，桑松魁1，2，闫楠1，2. 原状泥岩中模拟动力打桩与浸水静载试验研究[J]. 岩石力学与工程学报, 2023, 42(5): 1287-1300.
BAI Xiaoyu1，2，ZHANG Yamei1，2，YIN Jichao1，2，WANG Yonghong1，2，SANG Songkui1，2，YAN Nan1，2. Experimental study on simulated driven pile and immersion static load in undisturbed mudstone. , 2023, 42(5): 1287-1300.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0705 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I5/1287

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