低孔隙水压力对砂岩卸荷力学特性影响研究

doi:10.13722/j.cnki.jrme.2016.0095

摘要
图/表
参考文献(21)
相关文章 (15)

全文: PDF (1053 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为了研究低孔隙水压力对砂岩卸荷力学特性的影响，在TOP INDUSTRIE多功能岩石三轴测试系统上，设计进行不同围压(5，10，15，20 MPa)和不同孔隙水压力(0，0.3，0.6，0.9，1.2 MPa)下的砂岩三轴卸荷试验。重点分析孔隙水压力对砂岩卸荷强度及变形破坏特征的影响。研究结果表明：(1) 随着孔隙水压力的增大，岩样加载阶段的弹性模量逐渐减小，而且围压越小，相同的孔隙水压力增量条件下，弹性模量减小趋势越明显；(2) 在卸载过程中，岩样侧向变形的增大速率明显大于轴向变形，而且，孔隙水压力越大，围压越小，侧向扩容现象越明显，岩样越容易破坏；(3) 在卸载过程中，岩样的变形模量呈现先缓后陡的劣化规律，而且围压越小、孔隙水压力越大，变形模量降低幅度越大；(4) 随着孔隙水压力的增大，岩样破坏时对应的围压值逐渐增大，黏聚力和内摩擦角降低趋势明显，说明孔隙水压力加速了岩石破坏的进程；(5) 水对砂岩矿物颗粒的软化和颗粒间连接的弱化作用，以及孔隙水压力的水楔效应，是导致砂岩卸荷力学特性劣化的根本原因。因此，在涉水工程岩体卸荷变形稳定分析中，孔隙水压力的作用效应不容忽视。

	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
	邓华锋
	王哲
	李建林
	姜桥
	张恒宾

关键词 ：岩石力学, 孔隙水压力, 卸荷, 弹性模量, 变形模量, 软化, 水楔效应

Abstract：To study the effect on unloading mechanical properties of sandstone by low pore water pressure，triaxial unloading tests of sandstone under different confining pressure(5，10，15，20 MPa) and pore water pressure (0，0.3，0.6，0.9，1.2 MPa) have been done in TOP INDUSTRIE Multi-function triaxial testing system. It has mainly been discussed about how pore water pressure influenced the sandstone?s unloading strength and deformation and failure characteristics. The results showed that：(1) With the pore water pressure increasing，the elastic modulus in loading stage gradually decreased. And the decreasing trend of elastic modulus was more obvious under the smaller confining pressure with the same increment of the pore water. (2) During the unloading process，the increasing rate of lateral deformation was obviously higher than that of axial deformation. Moreover，the lateral expansion phenomenon is more obvious under higher pore water pressure and smaller confining pressure，which means the rock specimens are easier to damage. (3) During the unloading process，the deformation modulus of rock specimens decreased rapidly in the beginning and then slowly，and the rock specimens? deformation modulus declined dramatically with higher pore water pressure and smaller confining pressure. (4) With the increase of pore water pressure，the confining pressures related to rock specimens failure gradually increased，and the decreasing trend of cohesion and internal friction angle tend to be more obvious，which means the rock pore water pressure accelerates the process of rock failure. (5) The softening and weakening effect of water on the mineral particles and their inter-particle connection，and the water-wedge effect of pore water pressure are the basic reasons for sandstone?s unloading mechanical properties deterioration. Therefore，concerning to the analysis of unloading deformation stability of wading rock engineering project，the effect of pore water pressure cannot be ignored.

Key words： rock mechanics pore water pressure unloading elastic modulus deformation modulus softening water-wedge effect

引用本文:

邓华锋，王哲，李建林，姜桥，张恒宾. 低孔隙水压力对砂岩卸荷力学特性影响研究[J]. 岩石力学与工程学报, 2017, 36(4): 3266-3276.
DENG Huafeng，WANG Zhe，LI Jianlin，JIANG Qiao，ZHANG Hengbin. Experimental research about influence of low pore water pressure on unloading mechanical properties of sandstone. , 2017, 36(4): 3266-3276.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0095 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/I4/3266

[1]	哈秋舲，李建林，张永兴，等. 节理岩体卸荷非线性岩体力学[M]. 北京：中国建筑工业出版社，1998：7-40.(HA Qiuling，LI Jianlin，ZHANG Yongxing，et al. Jointed rock mass unloading nonlinear rock mechanics [M]. Beijing：China Construction Industry Press，1998：7-40.(in Chinese))
[2]	李建林. 卸荷岩体力学[M]. 北京：中国水利水电出版社，2003：22-59.(LI Jianlin. Unloading rock mass mechanics[M]. Beijing：China Water Power Press，2003：22-59.(in Chinese))
[3]	邓华锋，李建林，易庆林，等. 软岩高边坡开挖卸荷变形研究[J]. 岩土力学，2009，30(6)：1 731-1 734.(DENG Huafeng，LI Jianlin，YI Qinglin，et al. Soft rock high slope excavation unloading deformation research[J]. Rock and Soil Mechanics，2009，30(6)： 1 731-1 734.(in Chinese) )
[4]	武丽. 降雨入渗对边坡渗流特性及稳定的影响研究[硕士学位论文][D]. 南京：河海大学，2005.(WU li. Study on the characteristics of rain Infiltration and its influence on slope stability[M. S. Thesis][D]. Nanjing：Hohai University，2005.(in Chinese))
[5]	张成良. 深部岩体多场耦合分析及地下空间开挖卸荷研究[博士学位论文][D]. 武汉：武汉理工大学，2007.(ZHANG Chengliang. Multi field coupling analysis of deep rock mass and unloading of underground space excavation[Ph. D. Thesis][D]. Wuhan：Wuhan University of Technology，2007.(in Chinese))
[6]	徐蔚. 土石坝渗流监测资料分析方法的研究[硕士学位论文][D]. 杭州：浙江大学，2005.(XU Yu. Study on analysis method of seepage monitoring data of earth rock dam[M. S. Thesis][D]. Hangzhou：Zhejiang University，2005.(in Chinese))
[7]	董凤强. 渗流对尾矿坝稳定性影响的分析[硕士学位论文][D]. 昆明：昆明理工大学，2011.(DONG Fengqiang. Analysis of the influence of seepage on the stability of tailings dam[M. S. Thesis][D]. Kunming：Kunming University of Science and Technology，2011.(in Chinese))
[8]	俞缙，李宏，陈旭，等. 砂岩卸围压变形过程中渗透特性与声发射试验研究[J]. 岩石力学与工程学报，2014，33(1)：69-79.(YU Jin，LI Hong，CHEN Xu，et al. Experimental study of permeability and acoustic emission characteristics of sandstone during processes of unloading confining pressure and deformation[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(1)：69-79.(in Chinese))
[9]	陈秀铜，李璐. 高围压、高水压条件下岩石卸荷力学性质试验研究[J]. 岩石力学与工程学报，2008，27(增1)：2 694- 2 699.(CHEN Xiutong，LI Lu. Experimental study of unloading mechanical properties of rock under high confining pressure and high water pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.1)：2 694-2 699.(in Chinese))
[10]	张雪颖，阮怀宁. 高围压高水压条件下大理岩卸围压变形破坏与能量特征[J]. 水利水电科技进展，2009，29(5)：5-8.(ZHANG Xueying，RUAN Huaining. Unloading deformation failure and energy properties of marble under high confining pressure and high water pressure[J]. Advances in Science and Technology of Water Resources，2009，29(5)：5-8.(in Chinese))
[11]	李志敬，朱珍德，施毅，等. 高围压高水压条件下岩石卸荷强度特性试验研究[J]. 河海大学学报：自然科学版，2009，37(2)：162-165.(LI Zhijing，ZHU Zhende，SHI Yi，et al. Experimental study on unloading strength characteristics of rock under high confining pressure and high pressure condition[J]. Journal of Hohai University：Natural Science，2009，37(2)：162-165.(in Chinese))
[12]	刘向君，申剑坤，梁利喜，等. 孔隙压力变化对岩石强度特性的影响[J]. 岩石力学与工程学报，2011，30(增2)：3 457-3 463.(LIU Xiangjun，SHEN Jiankun，LIANG Lixi，et al. Effects of pore pressure on rock strength properties[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.2)：3 457-3 463.(in Chinese))
[13]	王俊光，梁冰. 不同裂隙水压力作用下岩石强度变化分析[J]. 西安石油大学学报，2007，22(9)：16-18.(WANG Junguang，LIANG Bing. Analysis of rock strength under different crack water pressure[J]. Journal of Xi'an Petroleum University，2007，22(9)：16-18.(in Chinese))
[14]	蒋海飞. 高围压高孔隙水压作用下岩石卸荷蠕变特性研究及其工程应用[博士学位论文][D]. 重庆：重庆大学，2014.(JIANG Haifei. Study on unloading creep characteristics of rock under high confining pressure and high pore water pressure and its engineering application [Ph. D. Thesis][D]. Chongqing：Chongqing University，2014.(in Chinese))
[15]	刘东燕，蒋海飞，李东升，等. 高围压高孔隙水压作用下岩石蠕变特性[J]. 中南大学学报，2014，45(6)：1 916-1 923.(LIU Dongyan，JIANG Haifei，LI Dongsheng，et al. The creep properties of rock under high confining pressure and high pore water pressure[J]. Journal of Central South University，2014，45(6)：1 916-1 923. (in Chinese))
[16]	李天一，徐进，王璐，等. 高孔隙水压力作用下岩体软弱结构面(带)力学特性的试验研究[J]. 岩石力学与工程学报，2012，31(增2)：3 936-3 941.(LI Tianyi，XU Jin，WANG Lu，et al. Experimental study on mechanical characteristics of rock mass under high pore water pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.2)：3 936-3 941.(in Chinese))
[17]	赵明阶，吴德伦. 工程岩体的超声波分类及强度预测[J]. 岩石力学与工程学报，2000，19(1)：89-92.(ZHAO Mingjie，WU Delun. The ultrasonic identification of rock mass classification and rock mass strength prediction[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(1)：89-92.(in Chinese))
[18]	邓华锋，李建林，邓成进，等. 岩石力学试验中岩样选择和抗压强度预测方法研究[J]. 岩土力学，2011，32(11)：3 399- 3 403.(DENG Huafeng，LI Jianlin，DENG Chengjin，et al. Analysis of sampling in rock mechanics test and compressive strength prediction methods[J]. Rock and Soil Mechanics，2011，32(11)： 3 399-3 403.(in Chinese))
[19]	黄高峰. Hoek-Brown强度准则在岩体工程中的应用研究[硕士学位论文][D]. 西安：西北农林科技大学，2008.(HUANG Gaofeng. Application research of Hoek-Brown strength criterion in rock mass engineering[M. S. Thesis][D]. Xi¢an：Northwest Agriculture and Forestry University，2008.(in Chinese))
[20]	贾善坡，陈卫忠，杨建平，等. 基于修正Mohr-Coulomb 准则的弹塑性本构模型及其数值实施[J]. 岩土力学，2010，31(7)：2 051-2 058.(JIA Shanpo，CHEN Weizhong，YANG Jianping，et al. An elastoplastic constitutive model based on modified Mohr- Coulomb criterion and its numerical implementation[J]. Rock and Soil Mechanics，2010，31(7)：2 051-2 058.(in Chinese))
[21]	邓华锋，李建林，刘杰. 考虑裂隙水压力的岩体压剪裂纹扩展规律研究[J]. 岩土力学，2011，32(增1)：297-302.(DENG Huafeng，LI Jianlin，LIU Jie. Research on propagation of compression shear fracture in rocks considering fissure water pressure[J]. Rock and Soil Mechanics，2011，32(Supp.1)：297-302.(in Chinese))