杭州湾新区深部高液限黏土工程特性研究
摘要:宁波杭州湾新区地处长江入海口南侧,地质环境和水动力条件复杂,沉积环境多变。该区地表以下40~60 m范围内普遍分布有高液限黏土层,该层土常处于建筑工程深基础持力层范围内,研究该层土的工程地质特性对杭州湾新区的开发建设具有重要的社会经济价值。从常规土工参数汇总、数理统计分析、结构性、损伤模型参数、三轴CU试验等方面研究杭州湾新区深部高液限黏土的工程特性,结果表明:(1)杭州湾高液限黏土物理性质表现为天然含水率高、孔隙比大、液限高等特征,但力学性质接近于宁波地区冲湖积的第二层硬土层;(2)通过数值计算软件检验,各物理力学参数基本呈良好的正态分布,可将物理指标参数视为常量,力学指标作为变量,同时需要考虑时空变异性和区域性;(3)根据试验结果定量计算,杭州湾高液限黏土为欠固结土、高灵敏度较强结构性黏土,且原状土多呈现应力软化特征,而重塑土呈现应力硬化特征。
Abstract:Ningbo Hangzhou Bay Area is located on the south side of the Yangtze River estuary. The geological environment and hydrodynamic conditions are complex, and the sedimentary environment is variable. The high liquid limit clay layer is widely distributed within the range of 40~60 m below the surface of the area. This layer of soil is often within the range of deep foundation bearing layer of construction engineering. Studying the engineering geological characteristics of this layer of soil has important social and economic value for the development and construction of Hangzhou Bay New Area. The engineering characteristics of the deep high liquid limit clay were studied from the aspects of conventional geotechnical parameters, mathematical statistics, structural properties, damage model parameters, and triaxial CU test. The results show that: (1) The physical properties of Hangzhou Bay high liquid limit clay are characterized by high natural water content, large void ratio, high liquid limit, etc., but the mechanical properties are close to the second hard soil layer of the alluvial lake in Ningbo area. (2) The physical and mechanical parameters are basically normal distribution through numerical calculation software. The physical index parameters can be regarded as constants, and the mechanical index can be regarded as variables. Time and space variability and regional characteristics should be considered. (3) According to the test results, the Hangzhou Bay high liquid limit clay can be quantitatively calculated as under-consolidated soil with high sensitivity. The undisturbed soil shows the characteristics of stress softening, while the remolded soil shows the characteristics of stress hardening.
中文标题:
杭州湾新区深部高液限黏土工程特性研究
Engineering Characteristics of Deep High Liquid Limit Clayin Hangzhou Bay Area
作者:
陈明举1,池恒天2, 3,,,武维勇2,程春红2
Chen Mingju1,Chi Hengtian2, 3,,,Wu Weiyong2,Cheng Chunhong2
作者简介:陈明举,1988年生,大学本科,工程师,从事岩土工程、水工环地质工作。E-mail:409839327@qq.com通讯作者:池恒天,1984年生,硕士,注册土木工程师(岩土),高级工程师,从事岩土工程、水工环地质工作。E-mail:27883329@qq.com
通讯地址:
1.宁波市轨道交通集团有限公司,浙江宁波 315101 2.浙江省工程勘察设计院集团有限公司,浙江宁波 315012 3.宁波工程勘察院有限公司,浙江宁波 315012
1.NingboRailTransitGroupCo.,Ltd.,Ningbo315101,Zhejiang,China 2.ZhejiangEngineeringInvestigationandDesignInstituteGroupCo.,Ltd.,Ningbo315012,Zhejiang,China 3.NingboEngineeringSurveyInstituteCo.,Ltd.,Ningbo315012,Zhejiang,China
中图分类号:TU 42
doi:10.3969/j.issn.1007-2993.2023.02.001
出版物:岩土工程技术
收稿日期:2021-11-30
修回日期:2022-07-18
录用日期:2022-08-25
刊出日期:2023-04-08
关键词:高液限黏土,工程地质特性,物理力学参数,损伤模型参数
Key words:high liquid limit clay,engineering geological characteristic,physical and mechanics parameters,damage model parameters
文档包含图片数量:图片(11)张
文档包含表格数量:表格(4)个
参考文献:
[1]许延春. 深部饱和黏土的力学性质特征[J]. 煤炭学报,2004,(1):26-30. doi: 10.3321/j.issn:0253-9993.2004.01.006
[2]介玉新,刘 正,李广信,等. 黄淮地区深部黏土工程性质试验研究[J]. 工业建筑,2006,(3):63-66. doi: 10.3321/j.issn:1000-8993.2006.03.017
[3]李文平,孙如华,王维理,等. 深部土高压卸载变形结构性量化参数确定及本构模型[J]. 工程地质学报,2007,(3):384-390. doi: 10.3969/j.issn.1004-9665.2007.03.013
[4]孙 强,姜振泉,李耀民,等. 万福井田深部黏土微观特性试验研究[J]. 煤炭学报,2012,37(12):2026-2030. doi: 10.13225/j.cnki.jccs.2012.12.002
[5]商翔宇,余海岁,周国庆,等. 高应力水平下深部黏土力学特性微观分析[J]. 岩土工程学报,2012,34(2):363-368.
[6]蒋明镜,沈珠江,邢素英,等. 结构性粘土研究综述[J]. 水利水电科技进展,1999,19(1):26-30.
[7]龚晓南,熊传祥,项可祥,等. 黏土结构性对其力学性质的影响及形成原因分析[J]. 水利学报,2000,31(10):43-47. doi: 10.3321/j.issn:0559-9350.2000.10.007
[8]拓勇飞,孔令伟,郭爱国,等. 湛江强结构性黏土的形成机理分析[J]. 工程地质学报,2004,12(1):79-83.
[9]刘恩龙,沈珠江,范 文. 结构性粘土研究进展[J]. 岩土力学,2005,26(S1):1-8.
[10]王国欣,肖树芳,黄宏伟. 天然结构性软粘土应力历史的确定[J]. 同济大学学报(自然科学版),2005,33(8):1007-1010. doi: 10.3321/j.issn:0253-374X.2005.08.003
[11]陈晓平,曾玲玲,吕 晶,等. 结构性软土力学特性试验研究[J]. 岩土力学,2008,29(12):3223-3228. doi: 10.3969/j.issn.1000-7598.2008.12.008
[12]张先伟,孔令伟,郭爱国,等. 湛江强结构性黏土的物理力学性质指标及相关性分析[J]. 工程地质学报,2011,19(4):447-454. doi: 10.3969/j.issn.1004-9665.2011.04.001
[13]黄绍铭, 高大钊. 软土地基与地下工程(第二版)[M]. 北京: 中国建筑工业出版社, 2005.
[14]刘 鹏,丁文其. 双对数压缩曲线在海积软土本构中的应用[J]. 上海交通大学学报,2016,50(11):1706-1711. doi: 10.16183/j.cnki.jsjtu.2016.11.008
[15]姜安龙,赵春风,高大钊. 确定先期固结压力的数学模型法[J]. 岩土力学,2003,(2):292-295. doi: 10.3969/j.issn.1000-7598.2003.02.031
[16]池恒天,席永慧,毛红辉,等. 象山大目湾新城浅部地层土工室内试验指标参数工程应用研究[J]. 结构工程师,2020,36(2):205-210. doi: 10.3969/j.issn.1005-0159.2020.02.027
[17]BUTTERFIELD R, TICOF J. Discussion: design parameters for granular soils[C]// Proceedings 7th European Conference on Soil Mechanics and Foundation Engineering, 1979.
[18]李雪梅,杨 敏,李卫超,等. 软土变形指标与初始孔隙率的相关性分析[J]. 长江科学院院报,2022,39(3):104-110. doi: 10.11988/ckyyb.20201268
[19]殷 杰,苗永红. 重塑黏性土固有压缩特性的探讨[J]. 工程地质学报,2012,20(3):403-409. doi: 10.3969/j.issn.1004-9665.2012.03.015
基金项目:
- 文件大小:
- 1.75 MB
- 下载次数:
- 60
-
高速下载
|