摘要
鉴于正确认识软硬互层岩体力学特征、分析其变形和强度规律,是大型岩体工程设计和施工需解决的关键问题,开展了一系列的物理模型试验和数值模拟试验,研究了软硬互层岩体的力学特征,探讨了互层的存在以及倾角变化对岩体变形破损的影响规律。结果表明,当岩层倾角由0°增加至90°时,试样的单轴抗压强度存在明显差异,抗压强度随岩层倾角的增大呈U型分布;试样的破损特征随倾角变化和分层变化呈不同破坏形态,破裂面主要沿软硬分层薄弱面发育,层间破坏主要由软弱分层的破坏引起;软硬分层薄弱面处切应力明显增大,相邻软硬夹层的应力分布有明显间断。
Further study of the mechanism and law of soft and hard interbedded rock mass and breakage has great significance to the large rock engineering design and construction.A series of laboratory tests and numerical simulations were used to research the mechanism of soft and hard interbedded rock mass,and the influence of dip angle and interlayers on the deformation and failure mechanism of soft and interbedded rock mass were discussed.The results show that the uniaxial compressive strength is changed with the dip angle from 0°to 90°and the strength distribution curve appears the Ushape.As the dip angle and interlayer＇s changing,the failure characteristics have different failure modes,and most of the failure surfaces develop along with soft and hard aspects.The layers failure is mainly caused by the destruction of soft interlayer.The shear stress at interlayers increases obviously and the stress distribution of the adjacent soft and hard interbedded salt rocks interrupts significantly.
出处
《水电能源科学》
北大核心
2015年第4期123-126,138,共5页
Water Resources and Power
基金
国家自然科学基金项目(41102182)
中国石油科技创新基金(2011D-5006-0603)
湖北省自然科学基金重点项目(2013CFA110)
湖北省建设科技计划项目(2011-119)
关键词
软硬互层岩体
室内试验
破坏模式
薄弱层
数值模拟
soft and hard interbedded rock mass
indoor test
failure mechanism
weak layer
numerical simulation
