半成岩变形强度特征与损伤本构模型研究

doi:10.13722/j.cnki.jrme.2019.0296

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (804 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要半成岩工程性质差，力学性质受含水状态影响很大。以昔格达组半成岩为研究对象，通过室内三轴试验研究半成岩变形特征和受力破坏机制，引入损伤理论，建立反映半成岩全应力–应变过程的损伤本构模型。结果表明：(1) 随着围压增加，半成岩峰值强度和残余强度均会提高，峰值强度对应的轴向应变有所增大，软化阶段应力–应变曲线波动性增强；(2) 随着含水率增加(17.79%≤ω≤30.83%)，半成岩峰值强度迅速降低，残余强度降幅较小，峰值强度对应的轴向应变有所增大；含水率较低时，峰值点尖锐，峰后应力快速跌落至残余强度，表现为岩石的软化特性；含水率较高时，峰值点坍落，峰后应力曲线斜率较缓，呈现应变软化向应变硬化转变的趋势，表现为土的变形特性；(3) 半成岩峰值强度和残余强度在试验含水率范围服从Mohr-Coulomb准则，各强度指标均随含水率增加近似线性减小，其中，峰值黏聚力与峰值摩擦角对含水率的敏感性大于残余黏聚力和残余摩擦角；(4) 所建立的半成岩损伤本构模型能较好地描述半成岩受含水率影响的强度、变形变化规律，模型曲线与试验结果一致，且形式简洁，参数较少。研究成果可为半成岩力学特性分析和工程应用提供试验依据和机制认识。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	杜宇翔1
	2
	盛谦1
	2
	付晓东1
	2
	但路昭3
	4
	张振平1
	2
	杜文杰1
	2
	陈贺4
	5

关键词 ：岩石力学, 半成岩, 昔格达, 含水率, 三轴试验, 变形与强度, 损伤本构模型

Abstract：The engineering properties of semi-diagenetic rock are poor，especially for the mechanical properties which are greatly affected by the water content. Taking the semi-diagenetic rock of the Xigeda formation as the research object，the deformation characteristics and failure mechanisms of semi-diagenetic rocks are studied by triaxial tests in laboratory，and a damage constitutive model reflecting the total stress-strain process of semi-diagenetic rocks is established by introducing the damage theory. The results show that，with increasing the confining pressure，the peak and residual strengths of semi-diagenetic rocks increase，and the axial strain corresponding to the peak strength and the fluctuation of the stress-strain curve in the softened stage increase. With increasing the water content(from 17.79% to 30.83%)，however，the peak strength of semi-diagenetic rocks decreases rapidly，the residual strength decreases in a less range，and the axial strain corresponding to the peak strength increases. When the water content is low，the peak point is sharp and the post-peak stress falls rapidly to the residual strength，which shows softening characteristics. When the water content is high，the peak point collapses and the slope of the stress curve after the peak is slower，showing a trend from strain softening to strain hardening similar to soils. The peak and residual strengths obey Mohr-Coulomb criteria in the range of experimental water content，and all strength indexes decrease approximately linearly with increasing the water content with a more sensitivity of the peak cohesion and the peak friction angle to the water content than that of the residual cohesion and the residual friction angle. It is also indicated that the developed model with a simple form and less parameters can well describe the strength and deformation variations of semi-diagenetic rocks affected by the water content and the model curve is consistent with the experimental results. The research results can provide experimental basis and mechanism understanding for the analysis of mechanical properties and engineering application of semi-diagenetic rocks.

Key words： rock mechanics semi-diagenetic rocks Xigeda water content triaxial test deformation and strength damage constitutive model

引用本文:

杜宇翔1，2，盛谦1，2，付晓东1，2，但路昭3，4，张振平1，2，杜文杰1，2，陈贺4，5. 半成岩变形强度特征与损伤本构模型研究[J]. 岩石力学与工程学报, 2020, 39(2): 239-250.
DU Yuxiang1，2，SHENG Qian1，2，FU Xiaodong1，2，DAN Luzhao3，4，ZHANG Zhenping1，2，DU Wenjie1，2，CHEN He4，5. Study on deformation and strength characteristics and damage constitutive model of semi-diagenetic rocks. , 2020, 39(2): 239-250.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0296 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I2/239

[1]	郭桂仁，王建. 介于软岩和硬土之间的特殊性岩土初步探讨[J]. 工程勘察，2009，(增2)：23-25.(GUO Guiren，WANG Jian. Preliminary discussion on special rock and soil between soft rock and hard soil[J]. Geotechnical Investigation and Surveying，2009，(Supp.2)：23-25.(in Chinese))
[3]	吴其伟，李天池. 半成岩大型滑坡机制和滑速分析[J]. 山地研究，1986，(1)：47-53.(WU Qiwei，LI Tianchi. Mechanism and sliding velocity analysis of large-scale semi-diagenetic rock landslide[J]. Mountain Research，1986，(1)：47-53.(in Chinese))
[5]	王思敬，黄鼎成. 攀西地区环境工程地质[M]. 北京：海洋出版社，1990：31-265.(WANG Sijing，HUANG Dingcheng. Environmental engineering geology in west of Sichuan[M]. Beijing：China Ocean Press，1990：31-265.(in Chinese))
[8]	何国富，张连中. 海南洋浦湾北侧更新世半成岩胶结砂层工程特性分析[J]. 勘察科学技术，2014，(1)：35-39.(HE Guofu，ZHANG Lianzhong. Analysis of engineering characters for pleistocene epoch half-diagenesis cemented sand in north of Hainan Yangpu bay[J] Site Investigation Science and Technology，2014，(1)：35-39.(in Chinese))
[10]	张琦，徐江，戴国亮，等. 马普托大桥南锚碇工程半成岩力学特性试验研究[J]. 岩石力学与工程学报，2017，36(10)：2 484-2 491. (ZHANG Qi，XU Jiang，DAI Guoliang，et al. Experimental study on mechanical property of hypabyssal rock at south anchorage base of Maputo bridge[J] Chinese Journal of Rock Mechanics and Engineering，2017，36(10)：2 484-2 491.(in Chinese))
[11]	周罕，曹平，张科. 昔格达组黏土岩和粉砂岩现场直剪试验研究[J]. 中南大学学报：自然科学版，2014，45(10)：3 544-3 550. (ZHOU Han，CAO Ping，ZHANG Ke. In-situ direct shear test on Xigeda Formation clay stone and siltstone[J]. Journal of Central South University：Science and Technology，2014，45(10)：3 544-3 550.(in Chinese))
[13]	彭选. 中南通道跨京沪铁路特大桥桥址区第四系半成岩基本承载力分析[J]. 铁道勘察，2009，35(4)：21-23.(PENG Xuan. Analysis on basic bearing capacity of Quaternary semi-formed rock around bridge site of Central South passage over super large bridge on Beijing—Shanghai railway[J]. Railway Investigation and Surveying，2009，35(4)：21-23.(in Chinese))
[6]	徐则民，刘文连，黄润秋. 金沙江寨子村巨型古滑坡的工程地质特征及其发生机制[J]. 岩石力学与工程学报，2011，30(增2)：3 539- 3 550.(XU Zeming，LIU Wenlian，HUANG Runqiu. Engineering geological characteristics of zhaizicun giant ancient landslide along jinsha river and its occurrence mechanisms[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.2)：3 539-3 550.(in Chinese))
[16]	曹文贵. 基于残余强度变形阶段特征的岩石变形全过程统计损伤模拟方法[J]. 土木工程学报，2012，45(6)：139-145.(CAO Wengui. A statistical damage simulation method for rock full deformation process with consideration of the deformation characteristics of residual strength phase[J]. China Civil Engineering Journal，2012，45(6)：139-145.(in Chinese))
[18]	曹文贵. 软化与硬化特性转化的岩石损伤统计本构模型之研究[J]. 工程力学，2006，23(11)：110-115.(CAO Wengui. Study on a statistical damage constitutive model with conversion between softening and hardening properties of rock[J]. Engineering Mechanics，2006，23(11)：110-115.(in Chinese))
[21]	中华人民共和国行业标准编写组. SL 237—1999 土工试验规程[S]. 北京：中国水利水电出版社，1999.(The Professional Standards Compilation Group of People¢s Republic of China. SL 237—1999 Specification of soil test[S]. Beijing：China Water Power Press，1999.(in Chinese))
[15]	曹文贵，赵明华，刘成学. 基于Weibull分布的岩石损伤软化模型及其修正方法研究[J]. 岩石力学与工程学报，2004，23(19)：3 226- 3 231.(CAO Wengui，ZHAO Minghua，LIU Chengxue. Study on the model and its modifying method for rock softening and damage based on weibull random distribution[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(19)：3 226-3 231.(in Chinese))
[23]	文丽娜，朱学雷，白志勇，等. 西攀高速公路新九地区昔格达地层岩土特性[J]. 公路，2005，(7)：145-148.(WEN Lina，ZHU Xuelei，BAI Zhiyong，et al. Rock and soil characteristics of Xigeda formation in Xinjiu area of expressway in west of Sichuan Province[J]. Highway，2005，(7)：145-148.(in Chinese))
[26]	CAO W G，ZHAO H，LI X，et al. Statistical damage model with strain softening and hardening for rocks under the influence of voids and volume changes[J]. Canadian Geotechnical Journal，2010，47(8)：857-871.
[20]	徐卫亚，韦立德. 岩石损伤统计本构模型的研究[J]. 岩石力学与工程学报，2002，21(6)：787-791.(XU Weiya，WEI Lide. Study on statistical constitutive model of rock damage[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(6)：787-791.(in Chinese))
[4]	刘惠军，聂德新. 昔格达地层研究综述[J]. 地球科学进展，2004，19(增1)：80-82.(LIU Huijun，NIE Dexin. A summary of the study of Xigeda Strata[J]. Advance in Earth Science，2004，19(Supp.1)：80-82.(in Chinese))
[14]	沈珠江. 结构性黏土的弹塑性损伤模型[J]. 岩土工程学报，1993，15(3)：21-28.(SHEN Zhujiang. Elasto-plastic damage model of structural clay[J]. Chinese Journal of Geotechnical Engineering，1993，15(3)：21-28.(in Chinese))
[2]	张永双，曲永新. 硬土-软岩的厘定及其判别分类[J]. 地质科技情报，2000，19(1)：77-80.(ZHANG Yongshuang，QU Yongxin. Determination of hard soil-soft rock and its discriminant classification[J]. Geological Science and Technology Information，2000，19(1)：77-80.(in Chinese))
[9]	刘靓. 南宁盆地泥岩力学性质研究[J]. 湖南地质，2002，21(4)：286-290.(LIU Liang. Study on mechanical properties of mudstone in Nanning basin[J]. Hunan Geology，2002，21(4)：286-290.(in Chinese))
[12]	吴有林. 胶结砂及半成岩黏土的岩土力学特征分析——以湘阴湘江大桥桥位区为例[J]. 水文地质工程地质，2002，29(5)：26-28.(WU Youlin. Character of cemented sand and half-diagenesis clay：A case study for the location of Xiangjiang Bridge[J]. Hydrogeology and Engineering Geology，2002，29(5)：26-28.(in Chinese))
[19]	LEMAITRE J. How to use damage mechanics[J]. Nuclear Engineering and Design，1984，80(2)：233-245.
[22]	蔡先庆，吴兴序，王建立. 西攀高速公路昔格达地层地基承载力试验分析[J]. 路基工程，2007，(3)：38-40.(CAI Xianqing，WU Xingxu，WANG Jianli. Experimental analysis on foundation bearing capacity of Xigeda formation on expressway in west of Sichuan Province[J]. Subgrade Engineering，2007，(3)：38-40.(in Chinese))
[24]	凌华，殷宗泽. 非饱和土强度随含水量的变化[J]. 岩石力学与工程学报，2007，26(7)：1 499-1 503.(LING Hua，YIN Zongze. Variation of unsaturated soil strength with water contents[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(7)：1 499- 1 503.(in Chinese))
[7]	徐则民. 金沙江寨子村滑坡坝堰塞湖沉积及其对昔格达组地层成因的启示[J]. 地质论评，2011，57(5)：675-686.(XU Zemin. Sedimentation of the dammed lake of zhaizicun landslide in jinsha river and its implications for the formation of Xigeda formation[J]. Geological Review，2011，57(5)：675-686.(in Chinese))
[17]	曹文贵，赵衡，张玲，等. 考虑损伤阀值影响的岩石损伤统计软化本构模型及其参数确定方法[J]. 岩石力学与工程学报，2008，27(6)：1 148-1 154.(CAO Wengui，ZHAO Heng，ZHANG Lin，et al. Damage statistical softening constitutive model for rock considering effect of damage threshold and its parameters determination method[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(6)：1 148-1 154.(in Chinese))
[27]	ZHOU G L，THAM L G，LEE P，et al. A phenomenological constitutive model for rocks with shear failure mode[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2001，25(4)：391-414.
[25]	陈忠辉，唐春安，徐小荷，等. 岩石声发射Kaiser效应的理论和实验研究[J]. 中国有色金属学报，1997，(1)：12-15.(CHEN Zhonghui，TANG Chun'an，XU Xiaohe，et al. Theoretical and experimental study on kaiser effect of rock acoustic emission[J]. The Chinese Journal of Nonferrous Metals，1997，(1)：12-15.(in Chinese))