单轴压缩条件下裂隙岩样冻融损伤破坏模式分析
发布时间:2018-11-15 12:29
【摘要】:以寒区裂隙岩体为研究对象,采用水泥砂浆类岩石材料制作具有不同几何特征的裂隙岩样,对预制的不同裂隙岩样进行冻融循环试验和单轴压缩试验,研究裂隙长度、裂隙倾角、裂隙数目以及冻融循环次数对试件贯通模式的影响。试验表明:裂隙岩体的几何特征以及冻融循环作用对岩体损伤破坏模式有较大影响。随着冻融循环次数的增加,岩样破裂面的破裂程度越来越严重,破坏模式也越来越复杂;裂隙倾角为30°的裂隙岩样,主要发生拉伸破坏,而裂隙倾角为60°的裂隙岩样,则表现为拉剪贯通,且双裂隙岩样岩桥间多出现压剪裂纹,对于裂隙倾角为90°的岩样,裂隙数目以及裂隙长度对其影响不大,均为劈裂破坏,且破坏面不一定为裂隙面;预制裂隙长度越大,越容易产生除了主拉裂纹以外的支裂纹(压裂纹)。研究结果可为寒区岩体工程建设及运营提供科学的参考。
[Abstract]:Taking fissured rock mass in cold region as the research object, the fracture rock samples with different geometric characteristics were made by using cement mortar type rock materials. The frozen and thawing cycle tests and uniaxial compression tests were carried out to study the crack length of different prefabricated fractured rock samples. The influence of fracture inclination, number of cracks and number of freeze-thaw cycles on the through-through mode of the specimen. The experimental results show that the geometric characteristics of fractured rock mass and freeze-thaw cycle have great influence on the damage and failure mode of rock mass. With the increase of freeze-thaw cycle, the fracture degree of rock specimen is more and more serious, and the failure mode is becoming more and more complex. The fracture rock sample with 30 掳crack inclination mainly occurs tensile failure, while the fracture rock sample with 60 掳crack dip angle is shown as tension shear through, and the compression shear crack occurs between the rock bridge of double fracture rock sample, and for the rock sample with 90 掳crack inclination angle, the fracture slope angle is 90 掳, and the fracture inclination angle is 90 掳. The number of fractures and the length of fractures have little effect on them, they are split failure, and the failure surface is not necessarily fracture surface. The larger the crack length is, the easier it is to produce a branch crack (compressive crack) other than the main tensile crack. The results can provide a scientific reference for the construction and operation of rock mass engineering in cold area.
【作者单位】: 湖北工程学院土木工程学院;武汉理工大学道路桥梁与结构工程重点实验室;湖北工程学院基本建设管理处;
【基金】:国家自然科学基金项目(51274157;51204128) 湖北省自然科学基金项目(2014CFB575)资助
【分类号】:TU45
[Abstract]:Taking fissured rock mass in cold region as the research object, the fracture rock samples with different geometric characteristics were made by using cement mortar type rock materials. The frozen and thawing cycle tests and uniaxial compression tests were carried out to study the crack length of different prefabricated fractured rock samples. The influence of fracture inclination, number of cracks and number of freeze-thaw cycles on the through-through mode of the specimen. The experimental results show that the geometric characteristics of fractured rock mass and freeze-thaw cycle have great influence on the damage and failure mode of rock mass. With the increase of freeze-thaw cycle, the fracture degree of rock specimen is more and more serious, and the failure mode is becoming more and more complex. The fracture rock sample with 30 掳crack inclination mainly occurs tensile failure, while the fracture rock sample with 60 掳crack dip angle is shown as tension shear through, and the compression shear crack occurs between the rock bridge of double fracture rock sample, and for the rock sample with 90 掳crack inclination angle, the fracture slope angle is 90 掳, and the fracture inclination angle is 90 掳. The number of fractures and the length of fractures have little effect on them, they are split failure, and the failure surface is not necessarily fracture surface. The larger the crack length is, the easier it is to produce a branch crack (compressive crack) other than the main tensile crack. The results can provide a scientific reference for the construction and operation of rock mass engineering in cold area.
【作者单位】: 湖北工程学院土木工程学院;武汉理工大学道路桥梁与结构工程重点实验室;湖北工程学院基本建设管理处;
【基金】:国家自然科学基金项目(51274157;51204128) 湖北省自然科学基金项目(2014CFB575)资助
【分类号】:TU45
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