高内摩擦角下珊瑚礁砂地基极限承载力初步分析

doi:10.13722/j.cnki.jrme.2022.0276

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摘要 Terzaghi等经典的极限承载力计算结果以及现场载荷试验结果均显示，珊瑚礁砂地基极限承载力最高可超过4 000 kPa，与其低承载力的一般认识差别明显。针对珊瑚礁砂高内摩擦角现象，依据经典的极限平衡计算模型，分析内摩擦角对整体剪切破坏形态特征的影响，阐明珊瑚礁砂高极限承载力的物理机制与形成条件。通过苏丹港吹填珊瑚礁砂场地地基处理前后的原位载荷试验，对珊瑚礁砂地基高极限承载力现象进行检验与确认。分析与结果表明，高内摩擦角、整体剪切破坏下，珊瑚礁砂地基会出现更大的剪切破坏深度、更广的剪切破坏范围，根据极限平衡条件将得到更高的极限承载力。整体剪切破坏是珊瑚礁砂地基出现高极限承载力的前提条件，采取分层强夯、分层吹填的地基处理工艺可满足这一条件。珊瑚礁砂的实际剪切破坏面可能与经典极限承载力计算方法假定破坏面存在较大差异，适合珊瑚礁砂的极限承载力计算公式有必要进一步研究。

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	曹振中1
	卢秀莲1
	莫红艳1
	秦志光2
	史元祺1

关键词 ：地基基础, 珊瑚礁砂, 极限承载力, 载荷试验, 内摩擦角, 剪切破坏

Abstract：The results of classical ultimate bearing capacity calculations developed by Terzaghi et al. and the results of in-situ plate load tests show that the ultimate bearing capacity of coralline sand foundations can exceed up to 4 000 kPa，which differs significantly from its general understanding of low bearing capacity. Since the coralline sand has high internal friction angle，based on the classical limit equilibrium calculation model，the influence of internal friction angle on the size of general shear failure range is analyzed to clarify the mechanism and conditions of high ultimate bearing capacity of coralline sand. Through the in-situ plate load test of the coralline sand sites at the Port of Sudan before and after treatment，the phenomenon of high ultimate bearing capacity of coralline sand foundation is confirmed. The analysis and results indicate that under the high internal friction angle and general shear condition，the coralline sand foundation could have a larger shear failure depth and wider shear failure range，which result in higher ultimate bearing capacity according to the ultimate equilibrium equations. General shear failure is a prerequisite for high ultimate bearing capacity of coralline sand foundation，and the foundation treatment of layered dynamic compaction and layered dredging can meet this condition. The actual shear failure range of coralline sand foundation may differ greatly from that of classical ultimate bearing capacity calculation method，and the ultimate bearing capacity calculation formula applicable for coralline sand is necessary for further study.

Key words： foundations coralline sand ultimate bearing capacity plate load test internal friction angle shear failure

引用本文:

曹振中1，卢秀莲1，莫红艳1，秦志光2，史元祺1. 高内摩擦角下珊瑚礁砂地基极限承载力初步分析[J]. 岩石力学与工程学报, 2023, 42(S1): 3609-3617.
CAO Zhenzhong1，LU Xiulian1，MO Hongyan1，QIN Zhiguang2，SHI Yuanqi1. Ultimate bearing capacity of coralline sand foundation under high internal friction angle. , 2023, 42(S1): 3609-3617.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0276 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3609

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