|本期目录/Table of Contents|

[1]程雪松,甄 洁,郑 刚,等.软土地区基坑坑底隆起稳定破坏滑动半径研究[J].建筑科学与工程学报,2021,38(06):90-97.[doi:10.19815/j.jace.2021.08051]
 CHENG Xue-song,ZHEN Jie,ZHENG Gang,et al.Research on Sliding Radius of Basal Heave Failure of Excavation in Soft Soil Area[J].Journal of Architecture and Civil Engineering,2021,38(06):90-97.[doi:10.19815/j.jace.2021.08051]
点击复制

软土地区基坑坑底隆起稳定破坏滑动半径研究(PDF)
分享到:

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
38卷
期数:
2021年06期
页码:
90-97
栏目:
软土基坑设计与变形控制
出版日期:
2021-11-05

文章信息/Info

Title:
Research on Sliding Radius of Basal Heave Failure of Excavation in Soft Soil Area
文章编号:
1673-2049(2021)06-0090-08
作者:
程雪松1,2,甄 洁2,郑 刚1,2,王志勇3,王 哲3,宋许根3
(1. 天津大学 滨海土木工程结构与安全教育部重点实验室,天津 300072; 2. 天津大学 建筑工程学院,天津 300072; 3. 中铁第四勘察设计院集团有限公司 道路交通设计研究院,湖北 武汉 430063)
Author(s):
CHENG Xue-song1,2, ZHEN Jie2, ZHENG Gang1,2, WANG Zhi-yong3, WANG Zhe3, SONG Xu-Gen3
(1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China; 2. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3. Road Traffic Design and Research Institute, China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China)
关键词:
坑底隆起 软土 不连续布局优化法 插入比 滑动半径
Keywords:
basal heave soft soil discontinuous layout optimization method insertion ratio sliding radius
分类号:
TU433
DOI:
10.19815/j.jace.2021.08051
文献标志码:
A
摘要:
为了研究软土地区基坑坑底隆起的破坏模式并确定合理的隆起破坏滑动面大小,采用不连续布局优化法对不同围护结构插入比条件下的基坑坑底隆起失稳滑动面进行分析; 通过大量计算得到可用于判断滑动面是否通过围护结构底端的不同基坑开挖深度下土体强度和围护结构临界插入比的幂函数关系表达式; 通过分析围护结构插入比较小时归一化的坑底隆起破坏滑动半径和围护结构插入比的关系,得到修正传统圆弧滑动法滑动半径的对数表达式及其系数。最后,将修正滑动半径后计算的安全系数与数值模拟结果进行了对比,验证了滑动半径公式的可靠性。结果表明:在插入比较大(大于临界插入比)情况下,滑动面通过围护结构底端; 在插入比较小情况下,滑动面不通过围护结构底端,需对传统圆弧滑动法进行修正; 提出的修正方法可为软黏土层较厚的基坑坑底隆起稳定分析时滑动半径的选取提供参考,同时可以解决传统圆弧滑动法在插入比较小时安全系数变化不合理的问题。
Abstract:
In order to study the failure mode of excavation basal heave in soft soil area and determine the reasonable basal heave sliding surface, the discontinuous layout optimization method was adopted to analyze the sliding surface of the excavation basal heave with different insertion ratios of the retaining structure. The power function expressions of the soil strength and the critical insertion ratio of the retaining structure at different excavation depths were obtained through a lot of calculations, which can judge whether the sliding surfaces pass through the end of the retaining structure. By analyzing the relationship between the normalized basal heave sliding radius of excavations and the insertion ratio of the retaining structure when the envelope was relatively small, the logarithmic expression and its coefficient table were obtained, which can modify the sliding radius of the traditional slip circle method. Finally, the safety factor calculated by modifying the sliding radius was compared with the numerical simulation results, which verified the reliability of the sliding radius formula. The results show that the sliding surface passes through the end of the retaining structure when the insertion ratio is larger(the insertion ratio of the retaining structure is larger than the critical insertion ratio). The sliding surface does not pass through the end of the retaining structure when the insertion ratio is relatively small, which needs to be improved. The proposed correction method can provide a reference for the selection of the sliding radius when analyzing the basal heave stability of excavations with thick soft clay. At the same time, it also solves the problem of changes irrationally in the safety factor of traditional slip circle method when the insertion ratio is small.

参考文献/References:

[1] 郑 刚,程雪松,刁 钰.无支撑多级支护结构稳定性与破坏机理分析[J].天津大学学报:自然科学与工程技术版,2013,46(4):304-314.
ZHENG Gang,CHENG Xue-song,DIAO Yu.Analysis of the Stability and Collapse Mechanism of Non-prop and Multi-stage Retaining Structure[J].Journal of Tianjin University:Science and Technology,2013,46(4):304-314.
[2]DO T N,OU C Y,CHEN R P.A Study of Failure Mechanisms of Deep Excavations in Soft Clay Using the Finite Element Method[J].Computers and Geotechnics,2016,73:153-163.
[3]郑 刚,王凡俊,孙宏宾,等.软土地区CFG桩群孔效应引发的地表沉降[J]. 天津大学学报:自然科学与工程技术版,2017,50(8):796-805.
ZHENG Gang,WANG Fan-jun,SUN Hong-bin,et al.Surface Settlement Caused by Borehole Group Effect of CFG Piles in Soft Soil[J].Journal of Tianjin University:Science and Technology,2017,50(8):796-805.
[4]LIAO H J,SU S F.Base Stability of Grout Pile-reinforced Excavations in Soft Clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2012,138(2):184-192.
[5]FAHEEM H,CAI F,UGAI K. Three-dimensional Base Stability of Rectangular Excavations in Soft Soils Using FEM[J].Computers and Geotechnics,2004,31(2):67-74.
[6]HUANG M S,TANG Z,YUAN J Y.Basal Stability Analysis of Braced Excavations with Embedded Walls in Undrained Clay Using the Upper Bound Theorem[J].Tunnelling and Underground Space Technology,2018,79:231-241.
[7]宋二祥,付 浩,林世杰,等.饱和黏性土不排水分析中总应力强度指标的选用[J].土木工程学报,2021,54(9):88-95.
SONG Er-xiang,FU Hao,LIN Shi-jie,et al.Discussion on the Choice of Strength Parameters for the Analysis of Saturated Clay Under Undrained Conditions[J]. China Civil Engineering Journal,2021,54(9):88-95.
[8]KHATRI V N,KUMAR J.Stability of an Unsupported Vertical Circular Excavation in Clays Under Undrained Condition[J].Computers and Geotechnics,2010,37(3):419-424.
[9]CHEN R P,LI Z C,CHEN Y M,et al.Failure Investigation at a Collapsed Deep Excavation in Very Sensitive Organic Soft Clay[J].Journal of Performance of Constructed Facilities,2015,29(3):04014078.
[10]GOHA T C.Basal Heave Stability of Supported Circular Excavations in Clay[J].Tunnelling and Underground Space Technology,2017,61:145-149.
[11]郑 刚,程雪松.考虑弧长和法向应力修正的基坑抗隆起稳定计算方法[J].岩土工程学报,2012,34(5):781-789.
ZHENG Gang,CHENG Xue-song.Basal Stability Analysis Method Considering Arc Length and Normal Stress Correction[J].Chinese Journal of Geotechnical Engineering,2012,34(5):781-789.
[12]黄茂松,李弈杉,唐 震,等.基于不排水强度的黏土基坑抗隆起稳定计算方法[J].岩土工程学报,2020,42(9):1577-1585.
HUANG Mao-song,LI Yi-shan,TANG Zhen,et al.Analysis Method for Basal Stability of Braced Excavations in Clay Based on Undrained Shear Strength[J].Chinese Journal of Geotechnical Engineering,2020,42(9):1577-1585.
[13] UKRITCHON B,WHITTLE A J,SLOAN S W.Undrained Stability of Braced Excavations in Clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(8):738-755.
[14]TERZAGHI K,PECK R B,MESRI G.Soil Mechanics in Engineering Practice[M].New York:John Wiley and Sons,Inc,1948.
[15]BJERRUM L,EIDE O.Stability of Strutted Excavations in Clay[J].Geotechnique,1956,6(1):32-47.
[16]王洪新.对基坑抗隆起稳定安全系数的改进[J].岩土力学,2014,35(增2):30-36.
WANG Hong-xin.Improvement on Safety Coefficient of Heave-resistant Stability of Excavations[J].Rock and Soil Mechanics,2014,35(S2):30-36.
[17]黄茂松,秦会来.基坑抗隆起稳定分析的现状与进展[J].岩土工程学报,2008,30(增1):182-186.
HUANG Mao-song,QIN Hui-lai.Basal Stability Analysis Methods for Braced Foundation Pit[J].Chinese Journal of Geotechnical Engineering,2008,30(S1):182-186.
[18]宋二祥,李贤杰,付 浩.深开挖及高填筑陡坡下地基承载力验算方法[J].工业建筑,2020,50(10):87-93.
SONG Er-xiang,LI Xian-jie,FU Hao.A Calculation Method for Bearing Capacity of Foundation Under Deeply Excavated or High Filled Slopes[J].Industrial Construction,2020,50(10):87-93.
[19]王洪新,陈建军,刘冀山.基坑抗隆起稳定安全系数实用计算分析与应用[J].岩石力学与工程学报,2007,26(增1):3223-3230.
WANG Hong-xin,CHEN Jian-jun,LIU Ji-shan.Practical Calculation Analysis and Application of Safety Factor of Heave-resistant Stability of Foundation Pit[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(S1):3223-3230.
[20]宋二祥,付 浩,李贤杰.基坑坑底抗隆起稳定安全系数计算方法改进研究[J].土木工程学报,2021,54(3):109-118.
SONG Er-xiang,FU Hao,LI Xian-jie.Improvement of Calculation Method for Safety Factor of Basal Heave Stability of Deep Excavation[J].China Civil Engineering Journal,2021,54(3):109-118.
[21]郑 刚,俞丹瑶,程雪松,等.考虑土体强度不均匀性时宽窄基坑坑底隆起稳定研究[J].岩土工程学报,2019,41(增1):1-4.
ZHENG Gang,YU Dan-yao,CHENG Xue-song,et al.Basal Heave Stability of Wide and Narrow Excavations Considering Non-homogeneous Features of Soft Clay[J].Chinese Journal of Geotechnical Engineering,2019,41(S1):1-4.
[22]DO T N,OU C Y.Factors Affecting the Stability of Deep Excavations in Clay with Consideration of a Full Elastoplastic Support System[J].Acta Geotechnica,2020,15(7):1707-1722.
[23]黄茂松,杜佐龙,宋春霞.支护结构入土深度对黏土基坑抗隆起稳定的影响分析[J].岩土工程学报,2011,33(7):1097-1103.
HUANG Mao-song,DU Zuo-long,SONG Chun-xia.Effects of Inserted Depth of Wall Penetration on Basal Stability of Foundation Pits in Clay[J].Chinese Journal of Geotechnical Engineering,2011,33(7):1097-1103.
[24]杜佐龙,黄茂松.非均质与各向异性黏土基坑抗隆起稳定分析[J].岩土力学,2013,34(2):455-461,467.
DU Zuo-long,HUANG Mao-song.Analysis for Basal Stability of Braced Excavation in Nonhomogeneous and Anisotropic Clay[J].Rock and Soil Mechanics,2013,34(2):455-461,467.
[25]WU S H,OU C Y,CHING J Y.Calibration of Model Uncertainties in Base Heave Stability for Wide Excavations in Clay[J].Soils and Foundations,2014,54(6):1159-1174.

相似文献/References:

[1]管大刚,胡志明,郑鹏鹏,等.开挖顺序及内支撑早期刚度对软土基坑稳定性影响规律[J].建筑科学与工程学报,2024,41(02):181.[doi:10.19815/j.jace.2022.03084]
 GUAN Dagang,HU Zhiming,ZHENG Pengpeng,et al.Influence laws of excavation sequence and early stiffness of inner support on stability of foundation pit in soft soil[J].Journal of Architecture and Civil Engineering,2024,41(06):181.[doi:10.19815/j.jace.2022.03084]

备注/Memo

备注/Memo:
收稿日期:2021-08-03
基金项目:国家自然科学基金重点项目(41630641); 中铁第四勘察设计院集团有限公司重点科研项目(2020K118)
作者简介:程雪松(1985-),男,河北邢台人,副教授,工学博士,E-mail:jiesarah@163.com。
更新日期/Last Update: 2021-11-01