裂隙性黄土在减压三轴压缩下的变形破坏特征
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摘要
为了研究黄土地区各种开挖工程所引起的土体变形乃至破坏现象,通过对裂隙性黄土样进行减压三轴压缩试验,得到其应力应变关系曲线,总结了裂隙性黄土的变形破坏特征。试验结果表明:减压三轴压缩试验下,裂隙性黄土的应力应变曲线以近似理想塑性或软弱化型为主,随着轴向压力的增大,其软化现象越明显;其总体变形方式为轴向变形和侧向弯曲变形;当土样裂隙角度为45°,60°时,容易沿原裂隙发生剪切破坏。
For studying the loess deformation and failure characteristics induced by engineering excavation,we studied the failure characteristics of fissured loess by the decompressed triaxial compression test and obtained the stress- strain curve. The summarization of the deformation and failure characteristics of fissured loess shows that the stress- strain curve of fissured loess is strain- soften type or approximately perfect plasticity,the softening phenomenon turns to be obvious with increase of axial stress,the deformation type is mainly axial and lateral bending deformation; the shear deformation is prone to occur along the original fissure when the fissure angles is 45° or 60°.
For studying the loess deformation and failure characteristics induced by engineering excavation,we studied the failure characteristics of fissured loess by the decompressed triaxial compression test and obtained the stress- strain curve. The summarization of the deformation and failure characteristics of fissured loess shows that the stress- strain curve of fissured loess is strain- soften type or approximately perfect plasticity,the softening phenomenon turns to be obvious with increase of axial stress,the deformation type is mainly axial and lateral bending deformation; the shear deformation is prone to occur along the original fissure when the fissure angles is 45° or 60°.
引文
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[9]刘祖典.黄土力学与工程[M].西安:陕西科学技术出版社,1996.
[10]卢全中,葛修润,彭建兵,等.三轴压缩条件下裂隙性黄土的破坏特征[M].岩土力学,2009,30(12):3689-3694.
[2]卢全中,彭建兵,陈志新,等.黄土高原地区黄土裂隙发育特征及其规律研究[J].水土保持学报,2005,19(5):191-194.
[3]蒋建平,章杨松,罗国煜.土体宏观结构面及其对土体破坏的影响[J].岩土力学,2002,23(4):482-485.
[4]卢全中,彭建兵.黄土结构面的发育特征及其灾害效应[J].西安科技大学学报,2006,26(4):446-450.
[5]李喜安,彭建兵,陈志新,等.湿陷性黄土地区土壤洞穴侵蚀研究[J].水土保持研究,2003,10(2):28-32.
[6]雷祥义.黄土高原地质灾害与人类活动[M].北京:地质出版社,2001.
[7]沈珠江,陈铁林.岩土破损力学-结构类型与荷载分担[J].岩石力学与工程学报,2004,23(13):2137-2142.
[8]卢全中,彭建兵,范文,等.三轴压缩条件下裂隙性黄土的变形特征[J].公路,2006,(8):1-4.
[9]刘祖典.黄土力学与工程[M].西安:陕西科学技术出版社,1996.
[10]卢全中,葛修润,彭建兵,等.三轴压缩条件下裂隙性黄土的破坏特征[M].岩土力学,2009,30(12):3689-3694.