粗粒土在平面应变条件下的强度特性研究

施维成; 朱俊高; 张 博; 余 挺

粗粒土在平面应变条件下的强度特性研究 English Version

( 1. 常州工学院土木建筑工程学院，江苏常州 213002 ； 2. 河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098 ； 3. 成都勘测设计研究院，四川成都 610072)

详细信息

作者简介:
施维成 (1982 – ) ，男，江苏盐城人，博士，讲师，主要从事土体强度准则及本构关系研究。

中图分类号: TU43
计量
- 文章访问数: 1233
- HTML全文浏览量: 1
- PDF下载量: 923
出版历程
- 收稿日期: 2012-01-06
- 发布日期: 2011-12-14

Strength characteristics of coarse-grained soil under plane strain condition

(1. School of Civil Engineering and Architecture, Changzhou Institute of Technology, Changzhou 213002, China ; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 3. Chengdu Hydroelectric Investigation and Design Institute, Chengdu 6 10072 , China)

摘要

摘要: 使用河海大学新型真三轴仪，对粗粒土分别进行 σ₃ 保持不变的等σ₃平面应变试验和 b =0 （即常规三轴压缩）、 b =0.25 的等σ₃等 b[b=(σ₂ -σ₃)/(σ₁ -σ₃)]试验，研究了粗粒土在平面应变条件下的应力路径、破坏时的中主应力系数、内摩擦角及破坏应力比的特点。试验结果表明，等 σ₃平面应变试验的应力路径介于 b =0 与 b =0.25 的等 σ₃ 等 b[b=(σ₂ -σ₃)/(σ₁ -σ₃)] 试验之间；粗粒土在平面应变条件下破坏时的中主应力系数 b 介于 0.15 ～ 0.2 之间；粗粒土在平面应变条件下的内摩擦角比常规三轴压缩条件下的大 5% ～ 7% ，而破坏应力比则比常规三轴压缩条件下的小 13% ～ 18% 。最后提出一个由粗粒土常规三轴压缩试验测得的内摩擦角 φ _tc求平面应变条件下的破坏应力比 M _fp的计算公式 M _fp=2.3sin φ_tc，可较好地模拟试验结果。
- 平面应变 /
- 粗粒土 /
- 内摩擦角 /
- 破坏应力比 /
- 真三轴仪
Abstract: Plane strain compression tests in which σ₃ keeps invariable and experiments in which both σ₃ and b[b=(σ₂ -σ₃)/(σ₁ -σ₃)] keep constant are performed on coarse-grained soil by means of the true triaxial apparatus recently developed in Hohai University. The characteristics of stress paths, parameter b at failure, angles of internal friction and peak values of stress ratio M _fp[=( q/ p)_fp] of coarse-grained soil under plane strain conditions are studied. The experimental results show that the stress paths of the plane strain tests exist between the b-constant tests in which b equals 0 and 0.25; the parameter b at failure is between 0.15 and 0.2 for coarse-grained soil under plane strain conditions; the angles of internal friction of coarse-grained soil under plane strain conditions are 5%~7% larger than those under triaxial compression conditions while the peak values of stress ratio of coarse-grained soil under plane strain conditions are 13%~18% smaller than those under triaxial compression conditions. Finally a formula expressed as M_fp=2.3sin φ_tc, which is verified by the test results of coarse-grained soil, is proposed to calculate the peak value of stress ratio, M_fp, under plane strain conditions from the angle of internal friction, φ _tc, obtained from conventional triaxial compression tests.
- plane strain /
- coarse-grained soil /
- angle of internal friction /
- peak value of stress ratio /
- true triaxial apparatus

HTML全文

参考文献(15)

[1]	V LADE, M DUNCAN. Cubical tria xial tests on cohesionless soil[J]. Journal of the Soil Mechanics and Foundations Division, 1973, 99 (SM10): 793 – 812.
[2]	MASANOBU ODA, ISAO KOISHIKAWA, TOSHIO HIGUCHI. Experimental study of anisotr opic shear strength of sand by plane strain test[J]. Soils and Foundations, 1978, 18 (1): 25 – 38.
[3]	ENRICO CONTE. Plane strain and axially symmetric consolidation in unsaturated soils[J]. International Journal of Geomechanics, 2006, 6 (2): 131 – 135.
[4]	殷宗泽 , 赵航 . 中主应力对土体本构关系的影响 [J]. 河海大学学报 , 1990, 18 (5): 54 – 61. (YIN Zong-ze, ZHAO Hang. Effect of middle principal stress on constitutive relationship[J]. Journal of Hohai University, 1990, 18 (5): 54 – 61. (in Chinese))
[5]	李广信 , 黄永男 , 张其光 . 土体平面应变方向上的主应力 [J]. 岩土工程学报 , 2001, 23 (3): 358 – 361. (LI Guang-xin, HUANG Yong-nan, ZHANG Qi-guang. The principal stress of soil in the direction of plane strain[J]. Chinese Journal of Geotechnical Engineering, 2001, 23 (3): 358 – 361. (in Chinese))
[6]	李广信 , 张其光 , 黄永男 . 等应力比平面应变试验中主应力转换的研究 [J]. 岩土力学 , 2006, 27 (11): 1867 – 1872. (LI Guang-xin, ZHANG Qi-guang, HUANG Yong-nan. Study on transforming of principal stresses in constant stress ration plane strain tests[J]. Rock and Soil Mechanics, 2006, 27 (11): 1867 – 1872. (in Chinese))
[7]	罗汀 , 姚仰平 , 松冈元 . 基于 SMP 准则的土的平面应变强度公式 [J]. 岩土力学 , 2000, 21 (4): 390 – 393. (LUO Ting, YAO Yang-ping, Matsuoka Hajime. Soil strength equation in plane strain based on SMP[J]. Rock and Soil Mechanics, 2000, 21 (4): 390 – 393. (in Chinese))
[8]	史宏彦 , 谢定义 , 汪闻韶 . 平面应变条件下主应力轴旋转产生的应变 [J]. 岩土工程学报 , 2001, 23 (2): 162 – 166. (SHI Hong-yan, XIE Ding-yi, WANG Wen-shao. Strain due to rotation of principal stress axes under plane strain condition[J]. Chinese Journal of Geotechnical Engineering, 2001, 23 (2): 162 – 166. (in Chinese))
[9]	刘元雪 , 郑颖人 . 含主应力轴旋转的土体平面应变问题弹塑性数值模拟 [J]. 计算力学学报 , 2001, 18 (2): 239 – 241. (LIU Yuan-xue, ZHENG Ying-ren. Elastoplastic numerical simulation of plane strain problems of soils involving rotation of principal stress axes[J]. Chinese Journal of Computational Mechanics, 2001, 18 (2): 239 – 241. (in Chinese))
[10]	路德春 , 姚仰平 , 周安楠 . 土体平面应变条件下的主应力关系 [J]. 岩石力学与工程学报 , 2006, 25 (11): 2320 – 2326. (LU De-chun, YAO Yang-ping, ZHOU An-nan. Relationship between principal stresses of soil mass under plane strain condition[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25 (11): 2320 – 2326. (in Chinese))
[11]	朱建凯 , 邓楚键 , 陈金峰 . 平面应变条件下的 M-C 准则的等效广义 Mises 变换公式及其应用 [J]. 水利学报 , 2006, 37 (7): 870 – 873. (ZHU Jian-kai, DENG Chu-jian, CHEN Jin-feng. General expression of equivalent generalized Mises transformation formula for Mohr-Coulomb yield criterion under plane strain condition[J]. Journal of Hydraulic Engineering, 2006, 37 (7): 870 – 873. (in Chinese))
[12]	王奎华 , 杨冬英 , 张智卿 . 简化平面应变土体模型的精度研究及适用性分析 [J]. 计算力学学报 , 2010, 27 (3): 496 – 516. (WANG Kui-hua, YANG Dong-ying, ZHANG Zhi-qing. A study on precision of simplified plane strain model of soil[J]. Chinese Journal of Computational Mechanics, 2010, 27 (3): 496 – 516. (in Chinese))
[13]	陈鸥 , 左永振 , 孔宪勇 . 砾石土强度和变形的平面应变试验研究 [J]. 人民长江 , 2010, 41 (9): 69 – 72. (CHEN Ou, ZUO Yong-zhen, KONG Xian-yong. Test of plane strain and study on strength and deformation of gravel soil[J]. Yangtze River, 2010, 41 (9): 69 – 72. (in Chinese))
[14]	殷宗泽 . 土工原理 [M]. 第二版 . 北京 : 中国水利水电出版社 , 2007. (YIN Zong-ze. Geotechnical theory and computing[M]. 2nd ed. Beijing: China Water Power Press. (in Chinese))
[15]	SHI Wei-cheng, ZHU Jun-gao, CHIU Chung-fai, et al. Strength and deformation behaviour of coarse-grained soil by true triaxial tests[J]. Journal of Central South University of Technology, 2010, 17 (5): 1095 – 1102.