動、靜載荷下不同角度裂縫對類砂巖力學(xué)特性影響試驗研究
[Abstract]:As a kind of complex geological body, rock has experienced various complex and uneven geological processes in the geological history of its formation and change, and its interior usually contains irregular defects such as joints, fractures, etc., and with the excavation of geotechnical engineering, With disturbance such as unloading, these defects in rock will be further expanded and penetrated, resulting in rock failure. In recent years, the study of mechanical properties of rock containing joints and cracks has become the focus of attention in rock mechanics and engineering. This subject has become one of the hot frontier topics. In this paper, the sandstones in Ludian County are taken as simulation objects, and the natural fractures are simplified and studied experimentally. In this paper, the influence of fracture on rock mechanical properties is analyzed theoretically, then sandstone like specimen is prepared and tested in laboratory, and the test results are analyzed under static load and dynamic load, respectively. The conclusions are as follows: (1) the angle of precast cracks under dynamic and static loads will change the mechanical properties of the specimens, and affect to some extent the generation, expansion and penetrating mode of internal cracks, and then reduce the strength of the specimens. At the same time, the cracks are closed to different degrees. (2) under the dynamic and static test conditions, the failure mode of the intact specimen, the 0 擄crack specimen and the 90 擄crack specimen is mainly the crack through the top and the bottom of the specimen, and the splitting tensile failure occurs. The fracture plane of 45 擄fracture specimen has a certain inclination angle with the direction of loading, and the shear failure and tensile failure will occur simultaneously. (3) the breaking degree and ultimate strength of the specimen under dynamic load are higher than those of static load, because the strain rate of the specimen under dynamic load increases. The strength of crack specimen is lower than that of complete specimen under two kinds of test conditions, and the failure mode of specimen is the same when the crack angle is the same. Taking prefabricated fractured sandstone specimens with different angles as experimental objects, the evolution process of cracks and the mechanical properties of specimens under dynamic and static loads are analyzed in this paper. The purpose of this paper is to discuss the influence of cracks on the mechanical properties of rocks. To provide theoretical reference for related geotechnical engineering.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TD315
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