基于离散元的强夯法加固珊瑚礁砂地基机理分析

王建平; 安韶; 方斌

doi:10.3724/j.gyjzG23102513

基于离散元的强夯法加固珊瑚礁砂地基机理分析

doi: 10.3724/j.gyjzG23102513

海军研究院, 北京 100071

基金项目:

国家重点研发计划项目(2019YFC1509704)

国家自然科学基金项目(41877218)。

详细信息

作者简介:
王建平,男,1964年出生,硕士,正高级工程师,从事土木海洋结构工程研究。

通讯作者:
安韶,从事岩土工程研究,as56913@163.com。

计量
- 文章访问数: 17
- HTML全文浏览量: 4
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-25
- 网络出版日期: 2024-11-06

Mechanism Analysis of Strengthening the Coral Reef Sand Foundation by Dynamic Compaction Method Based on Discrete Element Theory

Naval Research Institute, Beijing 100071, China

摘要

摘要: 强夯法加固地基具有效果显著、材料节省、工期短等优点,适用于珊瑚礁砂地基加固。为研究强夯法加固珊瑚礁砂地基机理,基于离散元既可以模拟珊瑚礁砂形状、又能较好地模拟强夯过程中土体孔隙率变化的特点,建立强夯法加固珊瑚礁砂地基的数值模型,并通过现场试验结果验证了数值模型的可靠性,最后通过模型分析不同夯击能作用下珊瑚砂的颗粒破碎过程、力链发展与地基沉降,明晰了地基加固的内在机理。研究结果表明:采用的离散元数值模型地基沉降结果与现场夯击试验结果具有较好的一致性,模型误差小、可信度高;强夯作用下,珊瑚砂颗粒孔隙减小,颗粒破碎带逐渐向夯坑两端发展,力链向夯击坑中心集中且呈放射状分布;夯击能越大,地表与地基一定深度范围内沉降越大,颗粒破碎带及力链均沿深度与广度两个方向发展。
- 离散元 /
- 强夯法 /
- 珊瑚礁砂 /
- 地基加固 /
- 机理分析
Abstract: The dynamic compaction method for reinforcing foundation has the advantages of significant effectiveness, saving in materials and short construction period, which is suitable for reinforcing coral reef sand foundation. To conduct the mechanism of strengthening coral reef sand foundation by dynamic compaction method, a numerical model was established based on discrete element method which could simulate both the shape of coral reef sand and the characteristics of soil porosity changes during the dynamic compaction process. The numerical model reliability was verified by field test results, and finally the coral reef sand particle crushing process, force chain development and foundation settlement under different tamping energy were analyzed, so as to clarify the internal mechanism of foundation reinforcement.The research results showed that the foundation settlement of adopted discrete numerical model showed a good alignment with that of field results, proving that the model had low error and high reliability; under the action of dynamic compaction method, the pores of coral reef particles decreased, the particle fragmentation zone gradually developed to both ends of the ramming pit, and the force chain was concentrated and radially distributed towards the center of the ramming pit; the greater the tamping energy, the greater the surface and foundation settlement within a certain depth range, and the particle fragmentation zone and force chain developed in both depth and breadth.
- discrete element /
- dynamic compaction method /
- coral reef sand /
- foundation reinforcement /
- mechanism analysis

HTML全文

参考文献(17)

[1]	沈扬,冯照雁,邓珏,等. 南海珊瑚砂地基承载力模型试究[J].岩土力学,2021,42(5):1281-1290.
[2]	吴杨,崔杰,李能,等. 岛礁吹填珊瑚砂力学行为与颗粒破碎特性试验研究[J].岩土力学,2020,41(10):3181-3191.
[3]	汪稔,吴文娟. 珊瑚礁岩土工程地质的探索与研究:从事珊瑚礁研究30年[J].工程地质学报,2019,27(1):202-207.
[4]	王刚,叶沁果,查京京.珊瑚礁砂砾料力学行为与颗粒破碎的试验研究[J].岩土工程学报,2018,40(5): 802-810.
[5]	沈扬,沈雪,俞演名,等.粒组含量对钙质砂压缩变形特性影响的宏细观研究[J].岩土力学,2019,40 (10): 3733-3740.
[6]	邓华,邱明喜,殷立静. 吹填珊瑚砂地基软弱夹层特性[J].水运工程,2019(11):156-159.
[7]	王伟光,郝秀文,李婉,等. 碾压方式对珊瑚砂地基工程特性的影响[J].长江科学院院报,2020,37(8):113-119.
[8]	夏玉云,乔建伟,刘争宏,等. 振动碾压对吹填珊瑚砂地基工程特性影响的试验研究[J].地基处理,2020,31(4):277-284.
[9]	王笃礼,肖国华,李兴,等. 基于振动碾压下沉量对比的一种珊瑚砂次压缩系数推测方法[J].岩土工程技术,2019,33(2):75-78.
[10]	李铭,韦港荣,蒋恒. 东南亚珊瑚砂岛礁类地基处理方法研究[J].西部交通科技,2019(6):42-44,158.
[11]	秦志光,袁晓铭,曹振中,等. 吹填珊瑚礁砂地基处理方法适用性与加固效果应用研究[J].自然灾害学报,2021,30(1):78-88.
[12]	罗尚奕,张浩天,高康华,等. 冲击荷载下珊瑚砂单颗粒动态破碎模拟研究[J].土工基础,2021,35(6):754-757.
[13]	CABBOU B.Behavior of granular materials[M]. Berlin:Springer, 2014.
[14]	马宗源,徐清清,党发宁. 碎石土地基动力夯实的颗粒流离散元数值分析[J].工程力学,2013,30(增刊1):184-190.
[15]	贾敏才,王磊,周健. 干砂强夯动力特性的细观颗粒流分析[J].岩土力学,2009,30(4):871-878.
[16]	XU M, HONG J, SONG E. DEM study on the effect of particle breakage on the macro-and micro-behavior of rockfill sheared along different stress paths[J].Computers and Geotechnics, 2017, 89:113-127.
[17]	王建平,郭东,张宏波,等. 珊瑚碎屑地基加固方法现场对比试验[J].工业建筑,2016,46(5):119-123.