长时高压<em>K</em><sub>0</sub>固结再冻结黏土的卸围压强度特性

王衍森; 贾锦波; 冷阳光

doi:10.11779/CJGE201709011

长时高压K₀固结再冻结黏土的卸围压强度特性 English Version

1. 中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州 221116;
2. 中国矿业大学力学与土木工程学院,江苏徐州 221116

基金项目: 国家自然科学基金项目（51174194）

详细信息

作者简介:
王衍森(1973- ),男,博士,研究员,主要从事岩土特殊施工技术方面的教学和科研工作。E-mail: yswang@cumt.edu.cn。

中图分类号: TU411
计量
- 文章访问数: 290
- HTML全文浏览量: 1
- PDF下载量: 157
出版历程
- 收稿日期: 2016-10-31
- 发布日期: 2017-09-24

Strength properties of unloading confining pressure of long-term K₀-consolidated artifical frozen clay under high pressure

1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining Science and Technology, Xuzhou 221116, China;
2. School of Mechanics and Civil Engineering, China University of Mining Science and Technology, Xuzhou 221116, China

摘要

摘要: 深厚表土层中立井井筒建设普遍采用冻结法,而深部冻土的原位力学特性是影响冻结壁力学特性及其安全稳定性的关键;现有的浅部冻土的试验方法,由于忽略了深、浅部土体固结、应力环境及形成工况的差异,已难以可靠地获得深部土的力学参数。基于“长时高压K₀固结—冻结—恒轴压卸围压”试验模式,通过三轴试验,研究了深部土重塑人工冻结黏土的强度与变形特征,以及固结时间、固结应力的影响规律。结果表明：卸围压路径下冻土试样呈现为黏-弹塑性破坏,固结时间为1~7 d时,其卸围压强度随固结时间的延长增长显著,而单位降温引起的强度增长速率受固结时间的影响不明显;随着固结时间延长至28 d,其卸围压强度受固结时间的影响不明显,但单位降温引起的强度增长速率增加显著;单位降温引起的冻土卸围压强度增长速率不受固结应力影响。
- 长时K0固结 /
- 深部黏土 /
- 有载冻结 /
- 卸围压强度
Abstract: In most cases, the artificial ground freezing method has been applied to construction of vertical shaft in deep and thick alluvia. Thus the in-situ mechanical properties of deep frozen soils are the most pivotal influence factor to the stabilization of frozen wall. It is suspicious to acquire the mechanical parameters of deep soils by the methods which are suitable for shallow soils ignoring their engineering situation and origin. Therefore, based on the new test mode of "Long-term, K₀ consolidated- freezing-constant axial pressure and unloading confining pressure", many triaxial unloading tests are conducted on remolded deep clay so as to study its strength and deformation properties and the influence laws of consolidation stress and consolidation time. The research results show that the failure mode of the frozen clay specimens under unloading path belongs to the viscoelastic-plastic one. The strength of the frozen clay consolidated for 1 to 7 days under unloading path increases evidently, however, the growth rate of strength is barely affected by the consolidation time while temperature decreases. Conversely, the strength increases inconspicuously when the consolidation time is expended to 28 days. In addition, there is significant increase of growth rate of strength relating to the descending temperature in the process of the long-term K₀ consolidation. The influence of consolidated stress on the growth rate of strength hardly relates to the subzero temperature.
- long-term K0 consolidation /
- deep clay /
- loading freezing /
- strength of unloading confining pressure

HTML全文

参考文献(13)

[1]	马芹永. 人工冻结法的理论与施工技术[M]. 北京: 人民交通出版社, 2007. (MA Qin-yong. Theory and cinstruction technology of artificial freezing method[M]. Beijing: China Communications Press, 2007. (in Chinese))
[2]	马巍, 吴紫汪, 常小晓. 固结过程对冻土应力-应变特性的影响[J]. 岩土力学, 2000, 21(3): 198-200. (MA Wei, WU Zi-wang, CHANG Xiao-xiao. Effects of consolidation process on stress-strain characters of tjaeles[J]. Rock and Soil Mechanics, 2000, 21(3): 198-200. (in Chinese))
[3]	许延春. 深部饱和黏土的力学性质特征[J]. 煤炭学报, 2004, 29(1): 26-30. (XU Yan-chun. Mechanics characteristics of deep saturated clay[J]. Journal of China Coal Society, 2004, 29(1): 26-30. (in Chinese))
[4]	李文平, 张志勇, 孙如华, 等. 深部黏土高压 K 0 蠕变试验及其微观结构各向异性特点[J]. 岩土工程学报, 2006, 28(10): 1185-1190. (LI Wen-ping, ZHANG Zhi-yong, SUN Ru-hua, et al. High pressure K 0 creep experiment and the anisotropy of microstructure of deep buried clay[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(10): 1185-1190. (in Chinese))
[5]	商翔宇. 不同应力水平深部黏土力学特性研究[D]. 徐州:中国矿业大学, 2009. (SHANG Xiang-yu. Study on the mechanical properties of deep clay under various stress level[D]. Xuzhou: China University of Mining and Technology, 2009. (in Chinese))
[6]	WATABE Y, TSUCHIDA T, ADACHI K. Undrained shear strength of pleistocene clay in Osaka Bay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128(3): 216-226.
[7]	李海鹏, 林传年, 张俊兵, 等. 原状与重塑人工冻结黏土抗压强度特征对比试验研究[J]. 岩土力学与工程学报, 2003, 22(2): 2861-2864. (LI Hai-peng, LIN Chuan-nian, ZHANG Jun-bing, et al. Comparative testing study on strength behaviour of undisturbed and remolded frozen clay[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(2): 2861-2864. (in Chinese))
[8]	王衍森, 程建平, 薛利兵, 等. 冻结法凿井冻结壁内外部冻胀力的工程实测及分析[J]. 中国矿业大学学报, 2008, 3(38): 303-308. (WANG Yan-sen, CHENG Jian-ping, XUE Li-bing, et al. In-situ measurements and analysis of frost-heave pressure inside and outside the ice wall during freeze sinking[J]. Journal of China University of Mining and Technology, 2009, 38(3): 303-308. (in Chinese))
[9]	王大雁, 马巍, 常小晓. K 0 固结后卸载状态下冻土应力-应变特性研究[J]. 岩石力学与工程学报, 2004, 23(8): 1252-1256. (WANG Da-yan, MA Wei, CHANG Xiao-xiao. Study on behavior of stress-strain for frozen soils subjected to K 0 consolidation by unloading triaxial shear tests[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(8): 1252-1256. (in Chinese))
[10]	赵晓东, 周国庆, 陈国舟. 温度梯度冻结黏土破坏形态及抗压强度分析[J]. 岩土工程学报, 2010, 32(12): 1856-1860. (ZHAO Xiao-dong, ZHOU Guo-qing, CHEN Guo-zhou. Failure modes and compression strength of frozen clay under thermal gradient[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(12): 1856-1860. (in Chinese))
[11]	WANG D Y, MA W, WEN Z, et al. Study on strength of artificially frozen soils in deep alluvium[J]. Tunnelling and Underground Space Technology, 2008, 23(4): 381-388.
[12]	GURYANOV I E, 马巍. 加荷与卸荷过程中冻土的强度特性[J]. 冰川冻土, 1995, 18(10): 53-57. (GURYANOV I E, MA Wei. Strength of frozen clay under loading and unloading[J]. Journal of Glaciology and Geocryology, 1996, 18(1): 53-57. (in Chinese))
[13]	田怀植, 王大雁, 马巍, 等. 高压力作用下深部黏土冻结后卸载应力路径的力学性质研究[J]. 冰川冻土, 2010, 32(2): 351-357. (TIAN Huai-zhi, WANG Da-yan, MA Wei, et al. Study of the mechanical properties of frozen deep-buried clay under high pressures in unloaded state[J]. Journal of Glaciology and Geocryology, 2010, 32(2): 351-357. (in Chinese))

施引文献

资源附件(0)

计量

文章访问数: 290
HTML全文浏览量: 1
PDF下载量: 157
被引次数: 0

长时高压K0固结再冻结黏土的卸围压强度特性 English Version

作者简介: 王衍森(1973- ),男,博士,研究员,主要从事岩土特殊施工技术方面的教学和科研工作。E-mail: yswang@cumt.edu.cn。

计量

出版历程

Strength properties of unloading confining pressure of long-term K0-consolidated artifical frozen clay under high pressure

计量

出版历程

目录

长时高压K₀固结再冻结黏土的卸围压强度特性 English Version

作者简介:
王衍森(1973- ),男,博士,研究员,主要从事岩土特殊施工技术方面的教学和科研工作。E-mail: yswang@cumt.edu.cn。

Strength properties of unloading confining pressure of long-term K₀-consolidated artifical frozen clay under high pressure