4/3/2025, 7:48:51 PM 星期四
K0应力路径试验在上海地区工程勘察中的应用
CSTR:
作者:
作者单位:

上海市岩土地质研究院有限公司,上海 200072

中图分类号:

TU411


Application of K0 stress path test in engineering investigation in Shanghai
Author:
Affiliation:

Shanghai Geotechnical Engineering & Geology Institute Co., Ltd., Shanghai 200072, China

  • 摘要
  • | |
  • 访问统计
  • |
  • 参考文献 [16]
  • |
  • 相似文献 [20]
  • | | |
  • 文章评论
    摘要:

    上海地区在进行软粘性土的变形特性试验时,勘察过程中极少进行对原状土在不同应力路径下的变形及强度试验研究,这使得报告中提供的参数不能很好地和基坑开挖卸荷过程中土体地层的实际相吻合。本文以上海市徐家汇某深大基坑项目为例,在勘察阶段进行K0应力路径三轴试验,试验内容为对选取的代表性土样进行加荷、卸荷及再加荷,并记录各阶段的应力应变及变形模量。对试验结果的分析表明,应力路径对软粘性土的影响较明显,K0应力路径可以较为真实地反映土体在天然状态下进行基坑开挖过程中的变形特性。建议以后在对变形敏感的深大基坑工程中加强推广应用。

    Abstract:

    In the test of deformation characteristics of soft clay soil in Shanghai, the test of deformation and strength of undisturbed soil under different stress paths is rarely carried out in engineering investigation, which makes the parameters provided in the investigation report not well consistent with the actual soil stratum in the excavation and unloading process of foundation pit. In this paper, taking a deep foundation pit project in Xujiahui, Shanghai for example, K0 stress path triaxial test was performed in the investigation stage. The test included loading, unloading and then reloading of the selected representative soil samples, and recording the stress and strain as well as modulus of deformation at every stage. The analysis of the test results shows that the stress path had an obvious effect on the soft clay soil, and the K0 stress path can reflect the deformation characteristics of the soil in the process of foundation pit excavation in the natural state. It is suggested to strengthen the promotion and application of the K0 stress path in the deep and large foundation pit projects which are sensitive to deformation.

    参考文献
    [1]严学新,史玉金.上海市工程地质结构特征[J].上海地质,2006(04):19-24.
    [2]胡其志,何世秀,杨雪强.基坑开挖软土流变特性的试验研究[J].湖北工学院学报,2003,18 ( 3) : 1-3.
    [3]李广信,张丙印,于玉贞.土力学(第二版)[M].北京:清华大学出版社,2017::127-153
    [4]Lambe TW.Stress path method [M].J.of Soil Mech. AndFound. Div. ASCE1967,93 ( SM6) : 268-277.
    [5]邓尧. 海相软土卸荷力学特性研究及其基坑开挖数值模拟[D].重庆:重庆大学,2017.
    [6]李光宏.复杂环境基坑支护方案的综合设计[J].探矿工程(岩土钻掘工程),2018,45(09):80-83.
    [7]翁鑫荣.软土应力路径特性的试验研究[J].岩土工程学报,2013,35(S2):825-828.
    [8]赵登峰. 考虑应力路径的软土深基坑开挖分析及m值优化研究[D].浙江宁波:宁波大学,2014.
    [9]刘国彬,侯学渊.软土的卸荷应力—应变特性[J].地下工程与隧道,1997,( 2) : 16-23.
    [10]刘国彬,贾付波.基坑回弹时间效应的试验研究[J].岩石力学与工程学报,2007,26 (S1) : 3040-3044.
    [11]郭月亮,田少坤.软土地区基坑开挖引起桩基质量问题的判定与处理[J].探矿工程(岩土钻掘工程),2015,42(06):59-62.
    [12]王建华,吴厚信,周宏益,左新明.紧邻地铁基坑支护工程设计[J].探矿工程(岩土钻掘工程),2011,38(11):71-75.
    [13]GB/T50123-1999,土工试验方法标准[S].
    [14]张坤勇,李广山,梅小洪,杜伟.基于K0固结排水卸荷应力路径试验粉土应力–变形特性研究[J].岩土工程学报,2017,39(07):1182-1188.
    [15]赵建军,姜芯.卸荷应力路径下海积软土力学性质试验[J].天津城建大学学报,2015,21(04):267-272.
    [16]王立忠,但汉波,李玲玲.K0固结软土的循环剪切特性及其流变模拟[J].岩土工程学报,2010,32(12):1946-1955.
    引证文献
    网友评论
    网友评论
    分享到微博
    发 布
引用本文

冯雪威. K0应力路径试验在上海地区工程勘察中的应用[J].钻探工程,2019,46(4):70-74,79.
FENG Xuewei. Application of K0 stress path test in engineering investigation in Shanghai[J]. Drilling Engineering, 2019,46(4):70-74,79.

复制
分享
文章指标
  • 点击次数:1117
  • 下载次数: 970
  • HTML阅读次数: 247
  • 引用次数: 0
历史
  • 收稿日期:2019-01-07
  • 最后修改日期:2019-03-16
  • 录用日期:2019-03-05
  • 在线发布日期: 2019-04-16
文章二维码