[1]李进晓,孟晓宇,任 宇.降雨条件下锚索预应力损失对深基坑变形的影响[J].华南地震,2026,46(02):100-108.[doi:10.13512/j.hndz.2026.02.13]
LI Jinxiao,MENG Xiaoyu,REN Yu.Influence of Prestress Loss in Anchor Cables on Deep Foundation Pit Deformation Under Rainfall Conditions[J].,2026,46(02):100-108.[doi:10.13512/j.hndz.2026.02.13]
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降雨条件下锚索预应力损失对深基坑变形的影响(
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华南地震[ISSN:1006-6977/CN:61-1281/TN]
- 卷:
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46
- 期数:
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2026年02期
- 页码:
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100-108
- 栏目:
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土木工程防震减灾
- 出版日期:
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2026-03-20
文章信息/Info
- Title:
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Influence of Prestress Loss in Anchor Cables on Deep Foundation Pit Deformation Under Rainfall Conditions
- 文章编号:
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1001-8662(2026)02-0100-09
- 作者:
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李进晓1; 孟晓宇2; 任 宇1
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1.上海核工程研究设计院股份有限公司,上海 200233;2.上海大学 力学与工程科学学院,上海 200444
- Author(s):
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LI Jinxiao1; MENG Xiaoyu2; REN Yu1
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1.Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd.,Shanghai 200233,China;2.School of Mechanics and Engineering Science , Shanghai University , Shanghai 200444, China
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- 关键词:
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深基坑工程; 岩土蠕变; 预应力损失; 降雨条件; 强度折减
- Keywords:
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Foundation pit engineering; Geotechnical creep; Prestress loss; Rainfall condition; Strength re?duction
- 分类号:
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TU473.2
- DOI:
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10.13512/j.hndz.2026.02.13
- 文献标志码:
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A
- 摘要:
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在深基坑工程中,锚索预应力损失会引起桩—锚支护体系发生较大变形,而降雨诱发的土体强度劣化则显著提高基坑失稳风险。以山东某核电厂深基坑为研究对象,综合分析了锚索预应力损失与土体劣化对基坑变形及稳定性的耦合影响。采用强度折减法模拟降雨引起的土体强度劣化,通过有限元软件分析不同土体强度折减率下,锚索预应力损失对深基坑变形与稳定性的影响。结果表明:锚索预应力损失主要集中在骤降与波动阶段,两阶段合计占总损失的97%,是基坑变形控制的关键期;当土体强度折减率超过20%临界值时,基坑水平位移显著增大,塑性区由填土层坡脚向坡顶贯通扩展;同时土体劣化显著增强了锚索预应力的损失效应,使基坑塑性区呈非线性扩展特征,其中预应力骤降阶段引起的塑性区面积增量最大;基坑安全系数由土体强度折减率主导,随其增大呈线性递减趋势。
- Abstract:
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In deep excavation engineering,the prestress loss of anchor cable can lead to significant deformation of the pile-anchor support system,while rainfall-induced degradation of soil strength markedly increases the risk of foundation pit instability. Taking the deep excavation project of a nuclear power plant in Shandong as the research object, this study comprehensively analyzed the coupled effects of prestress loss and soil strength degradation on the deformation and stability of foundation pit. The strength reduction method was employed to simulate the degrada?tion of soil strength caused by rainfall. Finite element simulations were conducted to investigate the influence of an?chor cable prestress loss on the deformation and stability of deep foundation pit under different soil strength reduc?tion rates. The results indicate that the prestress loss of anchor cable is mainly concentrated in the abrupt drop and fluctuation stages,and the two stages account for 97 % of the total loss,which is the key period for foundation pit deformation control. When the soil strength reduction ratio exceeds the threshold of 20%,the horizontal displace?ment of the foundation pit increases significantly,and the plastic zone extends nonlinearly from the toe to the crest of the fill slope. Meanwhile,soil degradation markedly amplifies the loss effect of anchor cable prestress,which makes the plastic zone of foundation pit show nonlinear expansion characteristics,with the abrupt drop stage con?tributing the largest increase in the plastic zone area. The safety factor of foundation pit is primarily governed by the soil strength reduction rate,exhibiting a linear decreasing trend with increasing reduction rate.
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备注/Memo
- 备注/Memo:
-
收稿日期:2025-09-25
作者简介:李进晓(1982-),男,硕士,高级工程师,一级注册结构师,一级注册建造师,主要从事核电厂结构设计和地基处理方面的研究。E-mail:lijinxiao@snerdi.com.cn
通信作者:任宇(1984-),男,博士,高级工程师,注册土木工程师(岩土),主要从事核电厂结构及岩土工程方面研究。E-mail:renyu2116@snerdi.com.cn
更新日期/Last Update:
2026-03-20