›› 2018, Vol. 39 ›› Issue (9): 3237-3245.doi: 10.16285/j.rsm.2016.2962

• 基础理论与实验研究 • 上一篇    下一篇

冻结粉土强度准则探讨

张 德1, 2,刘恩龙1, 3,刘星炎1, 2,宋丙堂1, 2   

  1. 1. 中国科学院西北生态环境资源研究院 冻土工程国家重点实验室,甘肃 兰州 730000;2. 中国科学院大学,北京 100049; 3. 四川大学 水利水电学院,四川 成都 610065
  • 收稿日期:2016-12-22 出版日期:2018-09-11 发布日期:2018-10-08
  • 通讯作者: 刘恩龙,1976年生,男,博士,教授,博士生导师,主要从事土的本构关系与数值模拟方面的研究工作。E-mail: liuenlong@scu.edu.cn E-mail: 120821875@qq.com
  • 作者简介:张德,1987年生,男,博士研究生,主要从事冻土本构模型方面的研究工作。
  • 基金资助:

    中国科学院“百人计划”资助项目;国家自然科学基金项目(No.41771066)。

Investigation on strength criterion for frozen silt soils

ZHANG De1, 2,LIU En-long1, 3,LIU Xing-yan1, 2,SONG Bing-tang1, 2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. College of Water Resources and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China
  • Received:2016-12-22 Online:2018-09-11 Published:2018-10-08
  • Supported by:

    This work was supported by the CAS Pioneer Hundred Talents Program and the National Science Foundation of China (41771066).

摘要: 冻土的强度随围压的增加呈先增大后减小的趋势,通过修正子午面内q-p曲线的斜率M*来探讨冻土强度变化规律。基于摩尔圆和包络线定理,推导了冻土内摩擦角随平均正应力的变化规律。假定偏应力的大小采用Mohr-Coulomb和Von-Mises强度准则的组合形式表示,将内摩擦角引入到偏平面中获得了偏平面内的强度准则。在不同温度(-6、-10、-15 ℃)和0.3~15.0 MPa围压下对冻结粉土进行了一系列低温三轴压缩试验,根据试验结果确定了子午面和偏平面的相关强度参数。结果表明:(1)子午面内的强度准则能较好模拟冻土在低围压下的强化效应和高围压下的弱化效应;(2)内摩擦角随平均正应力增大呈先增大后减小的趋势;(3)随控制参数s的增加,在偏平面内偏应力由Mohr-Coulomb包络线逐渐向Von-Mises包络线转化,其形状大小与极限强度值呈一一对应关系。最后通过试验结果与已有的强度准则对比表明:修正的强度准则具有一定的适用性。

关键词: 冻结粉土, 强度准则, 修正Mohr-Coulomb准则, 子午面, 偏平面

Abstract: The strength for frozen silt soil increases with the increase of confining pressure at relatively low pressures, but decreases with the increase of confining pressure at relatively high pressures, which is different from unfrozen geomaterials such as metal, concrete, rock, sand and clay. To investigate the strength criterion for frozen soils and simulate the breaking process under different confining pressures, the strength criterion is derived from the modified slope M* of q-p strength curves in the meridian plane, and the formulation is deduced, which is related to internal friction angle and average normal stress on the basis of the Mohr’s circle and envelope theory. The strength criterion in the deviatoric plane is obtained from the assumption that the deviatoric stress is a combination of Mohr-Coulomb and Von-Mises strength criterion. A series of cryogenic triaxial compressive tests are conducted at three different temperatures, i.e. -6, -10 and -15 ℃, and different confining pressures of 0.3, 1.4, 3.0, 6.0, 10.0 and 15.0 MPa to determine the related strength parameters. Testing results are shown as follows: 1) the modified strength criterion in the meridian plane can simulate the strengthening effect at a relatively low confining pressure and the weakening effect at a high confining pressure; 2) the variation tendency of internal friction angle increases first and then decreases with the increase of normal stress; and 3) with the increase of parameters, the envelope shape of deviatoric stress is transformed from Mohr-Coulomb to Von-Mises criterion in the deviatoric plane, and its value corresponds to yield stress. Finally, the comparison between literature and experimental data demonstrates that the proposed strength criterion has a satisfactory applicability for frozen silt soils.

Key words: frozen silt soil, strength criterion, modified Mohr-Coulomb criterion, meridian plane, deviatoric plane

中图分类号: 

  • TU 445
[1] 周兴涛,盛 谦,崔 臻,朱泽奇,胡之锋,马亚丽娜, . 基于C2阶连续函数的广义Hoek-Brown强度准则屈服面与塑性势面棱角圆化方法[J]. , 2018, 39(S1): 477-487.
[2] 姜光成,胡乃联,洪根意,李国清,方京珍,. 基于GSI值量化和修正方法的岩体力学参数确定[J]. , 2018, 39(6): 2211-2218.
[3] 陈四利,李艳宇,周 辉,胡大伟,. 基于极限应力比的三参数双τ2强度准则及其应用[J]. , 2018, 39(6): 1948-1954.
[4] 马林建,阳 发,王明洋,李 増,. 考虑应变率效应的广义Hoek-Brown动态强度准则[J]. , 2017, 38(S2): 27-32.
[5] 陈卫忠,马池帅,田洪铭,杨建平,. TBM隧道施工期岩爆预测方法探讨[J]. , 2017, 38(S2): 241-249.
[6] 江 贝,李术才,王 琦,王富奇,张若祥,. 基于上限法的深部大断面回采巷道顶板锚索设计方法研究[J]. , 2017, 38(8): 2351-2354.
[7] 孔志鹏,孙海霞,陈四利. 岩石材料的一种非线性三参数强度准则及应用[J]. , 2017, 38(12): 3524-3531.
[8] 郭建强 ,刘新荣 ,王军保 ,黄质宏,. 基于弹性应变能的岩石强度准则[J]. , 2016, 37(S2): 129-136.
[9] 贺建清,肖 兰,张文勇,高文华,. 基于改进的Mohr-Coulomb强度准则下岩石锚杆极限抗拔承载力计算[J]. , 2016, 37(9): 2484-2488.
[10] 代金秋,苏仲杰,赵明超,项宇航,. 粉质黏土的真三轴试验及强度特性研究[J]. , 2016, 37(9): 2534-2540.
[11] 李 斌,许梦国,刘艳章. 临界状态围压在岩石强度准则改进中的应用[J]. , 2016, 37(2): 390-398.
[12] 汪丁建,唐辉明,李长冬,葛云峰,易贤龙. 强降雨作用下堆积层滑坡稳定性分析[J]. , 2016, 37(2): 439-445.
[13] 牛亚强 ,赖远明 ,王 旭 ,廖孟柯 ,高 娟,. 初始含水率对冻结粉质黏土变形和强度的影响规律研究[J]. , 2016, 37(2): 499-506.
[14] 张 玉 ,邵生俊 ,王丽琴 ,马 林,. 平面应变条件下土的强度准则分析及验证[J]. , 2015, 36(9): 2501-2509.
[15] 邓东平,李 亮. 基于非线性统一强度理论下的边坡稳定性极限平衡分析[J]. , 2015, 36(9): 2613-2623.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 王 刚,蒋宇静,王渭明,李廷春. 新型数控岩石节理剪切渗流试验台的设计与应用[J]. , 2009, 30(10): 3200 -3209 .
[2] 徐中华,王卫东. 敏感环境下基坑数值分析中土体本构模型的选择[J]. , 2010, 31(1): 258 -264 .
[3] 梁发云,于 峰,李镜培,姚国圣. 土体水平位移对邻近既有桩基承载性状影响分析[J]. , 2010, 31(2): 449 -454 .
[4] 苏永华,谢志勇,徐能雄,欧阳光前. 半填半挖路基交接面稳定性分析[J]. , 2010, 31(2): 497 -502 .
[5] 王明年,陈炜韬,刘大刚,童建军. 公路隧道岩质和土质围岩统一亚级分级标准研究[J]. , 2010, 31(2): 547 -552 .
[6] 郭 军,王明年,谭忠盛,罗禄森. 大跨浅埋黄土隧道中系统锚杆受力机制研究[J]. , 2010, 31(3): 870 -874 .
[7] 刘玉成,曹树刚,刘延保. 可描述地表沉陷动态过程的时间函数模型探讨[J]. , 2010, 31(3): 925 -931 .
[8] 张秀成,王义重,傅旭东. 不同应力路径下某高速公路路基黏性土湿化变形试验研究[J]. , 2010, 31(6): 1791 -1796 .
[9] 井彦林,仵彦卿,林杜军,李晓光,张志权. 基于最小二乘支持向量机的黄土湿陷性预测挖掘[J]. , 2010, 31(6): 1865 -1870 .
[10] 王生新,陆勇翔,尹亚雄,郭定一. 碎石土湿陷性试验研究[J]. , 2010, 31(8): 2373 -2377 .