摘要
利用试验方法研究了节理岩体中表面裂隙不同制作方式及充填情况对表面裂隙扩展规律的影响。在试件制作过程中采用预埋聚酯薄膜片、预埋薄铝片及切割等方法制作了表面裂隙。随后对试件进行了单轴压缩实验,试验结果表明,利用预埋薄膜片和切割形成的表面裂隙能够较好地模拟自然界节理岩体的天然裂隙,但是预埋薄铝片形成表面裂隙的试件在单轴压缩试验过程中并不能从预制裂隙处起裂和贯通,因此预埋薄铝片形成的表面裂隙并不能很好地模拟节理岩体中的天然裂隙。在切割形成的表面裂隙中放置聚酯薄膜片和薄铝片以模拟2种不同的充填物,通过与不含充填物的表面裂隙的扩展情况比较,含充填物的表面裂隙的起裂强度和贯通强度会更高。
The article examines the influence of the ways in which the surface cracks are made and fillings inthe surface cracks on the fracture behavior of the jointed rock masses by a number of experiments.In the experiments the surface cracks are made in different methods such as placing polyester and aluminum thin plate, and cutting.Then,the specimens are tested in the single-axis compression experiments.The experimental results show that the surface crack made by placing polyester thin plates and cutting may well simulate the natural cracks in jointed rock masses,but the specimens can′t initiate and fracture through the surface cracks formed by placing aluminum thin plates during the single-axis compression experiments.The surface cracks formed by placing aluminum thin plates are unable to simulate the natural cracks in jointed rock masses.In order to study the influences of the fillings in the cracks on the fracture behavior of the jointed rock masses,polyester and aluminum thin plates are placed in the surface cracks to simulate different fillings.Compared with the propagation of the surface cracks without fillings,the crack initiation strength and through strength of the surface cracks with fillings will be higher.
出处
《山东交通学院学报》
CAS
2012年第1期67-70,86,共5页
Journal of Shandong Jiaotong University
基金
国家自然科学基金项目(40902083)
山东省优秀中青年科学家科研奖励基金(2009BSB01921)
交通运输部交通应用基础研究项目(2010319817040)
关键词
表面裂隙
节理岩体
充填
裂隙扩展
surface crack
jointed rock mass
filling
crack propagation
