倾角对裂隙岩体力学特性影响试验模拟研究  

Experimental Research on the Influence of Obliquity on the Mechanical Characteristics of a Fractured Rock Mass

作　　者：张伟[1,2] 周国庆[1] 张海波[2] 张勇[2] 

机构地区：[1]中国矿业大学建筑工程学院,江苏徐州221116 [2]徐州空军学院机场工程系,江苏徐州221000

出　　处：《中国矿业大学学报》2009年第1期30-33,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(50534040)

摘　　要：为了解决工程中遇到的裂隙岩体的开挖与防护问题,用水泥砂浆制作试样,模拟具有不同倾角的贯通裂隙岩体,利用电液伺服万能试验机和分离式霍普金森压杆分别对试样施加静、动荷载,分析倾角对裂隙岩体静、动态力学性能的影响.结果表明,裂隙岩体的破坏具有脆性破坏的特征;其强度具有应变率敏感性,随着应变率的提高,强度也得到提高;倾角对裂隙岩体的静、动态力学性能有影响,静态荷载下的抗压强度在裂隙倾角为45°时最小,0°和90°时最大,而动力荷载下的抗压强度则是在裂隙倾角为30°时最小,90°时最大.Rock mass fracture data was collected from cement specimens to help solve engineering problems related to the digging and support of fractured rock masses. The specimens were made from cement and are intended to simulate rock masses that have different obliquities in cross-sectional fracture. The specimens were loaded with a static load or with a dynamic load using an electro-hydraulic servo test machine or a split Hopkinson pressure bar. The influence of obliquity on the mechanical characteristics of the fractured rock mass was analyzed. The results are that the fractured rock mass shows the characteristics of brittle failure. The strength is sensitive to the strain rate： the strength increase with an increase in the strain rate. There is difference between the static and dynamic fracture of the rock mass related to obliquity. The lowest and the highest compression strength of the fractured rock mass under static loads occurred when the obliquity was 45° and 0° or 90°. Under dynamic loads the lowest and highest strengths occurred at 30° and 90°.

关 键 词：裂隙岩体 倾角 试验研究 动、静态力学性能 

分 类 号：TU411[建筑科学—岩土工程]