摘要
为了研究不同种类岩石在点载荷作用下塑性特征,通过室内实验测定了花岗岩、细砂岩、黄砂岩、玄武岩、粉砂岩、红砖在点载荷作用下位移-载荷曲线,得到了6种类岩石力学特性和塑性特征。粉砂岩、红砖和玄武岩的强度接近;黄砂岩、花岗岩和细砂岩强度呈现线性增大,且与刚度变化趋势相一致。随着强度的增加,变形呈现先急剧增长后缓慢下落的特点。根据曲线规律对岩石进行分类和分级,黄砂岩、粉砂岩、玄武岩和红砖均属于脆塑性岩石;玄武岩为塑性岩石,细砂岩为脆性岩石。通过塑性系数对岩石进行分类,细砂岩为脆性岩石,级别为1级,塑性系数为1;玄武岩为塑性岩石,级别为6级,塑性系数为6~∞;花岗岩塑性<黄砂岩塑性<粉砂岩塑性<红砖塑性。岩石越致密越均质,弹脆性越好;孔隙越多越离散,塑性变形越明显。
In order to study the different kinds of rock plastic characteristics under point load,the granite、sandstone、siltstone、yellow sandstone、basalt、red brick load-displacement curves were obtained under point loading by laboratory experiment,it is got mechanical properties of 6 kinds of rock and plastic characteristics.The siltstone、red brick and basalt of strength is close,the yellow sandstone、granite and fine sandstone of strength appear linearly increases,the trend of stiffness is coincident.With the increase of strength,the deformation presents rapid growth and slow drop of characteristics.According to the law of curve classification and classification of rock,yellow sandstone、siltstone、basalt and red brick belong to brittle plastic rock,basalt is plastic rock,fine sandstone is brittle rock.Through the plastic coefficient classify for rocks,sandstone belong to brittle rock,the result is grade 1,the plastic coefficient is 1,basalt is plastic rock,the result is grade 6,the plastic coefficient range 6 ~ ∞,granite plastic yellow sandstone plastic siltstone plastic red brick plastic.Rock is more dense and more homogeneous,it is elastic brittle the better,the more pore is discrete,the more obvious is plastic deformation.
出处
《科学技术与工程》
北大核心
2018年第2期217-222,共6页
Science Technology and Engineering
基金
哈尔滨市科技局科技创新人才研究专项资金(2017RAQXJ041)
国家自然科学基金(51574115
51374097
51604100)
黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室开放课题(F2313-01)资助
关键词
点载荷
塑性特征
岩石破裂
力学特征
岩石分类
point load plastic characteristics rock fractur mechanical characteristics rock clas-sifi＋ation
作者简介
刘刚（1986-）,硕士研究生.研究方向：岩石力学.E-mail：18944630110@163.com.
