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采用应力归还伺服控制方法,对I和II类岩石荷载速率依存性进行研究。首先,运用变阻器技术,实现伺服试验机应力归还控制,能对岩石峰后进行稳定控制,完整地获得岩石的全应力–应变曲线。其次,对I(田下凝灰岩、荻野凝灰岩)和II类岩石(江持安山岩、井口砂岩)进行恒定荷载速率、交替荷载速率和加载–卸载–加载组合试验,组合试验对弹性和非弹性应变成功地进行了分离,得到非弹性应变和应力的对应关系。试验结果表明,破坏强度、破坏应变、杨氏模量和破坏寿命具有明显的荷载速率特性。最后,对峰前区域的荷载速率依存性常数n提出了3种求解方法,为研究岩石的速率效应奠定了基础。
The stress-dependent servo control method was used to study the dependency of rock load rates on type I and II rocks. First of all, the use of rheostat technology to achieve the servo test machine stress return control, the rock can be post-peak stability control, complete access to the rock’s full stress-strain curve. Second, the combination tests of I (Tanaka tufa, Tadano tuff) and Group II rocks (Jiangan andesite and wellhead sandstone) were carried out at constant load rate, alternating load rate and load-unload-load combination test The separation was carried out to obtain the corresponding relationship between inelastic strain and stress. The test results show that the failure rate, the Young’s modulus and the failure life have obvious load-rate characteristics. Finally, three solving methods are proposed for the dependence of load-rate dependence n on the area before the peak, which lays the foundation for the study on the rate effect of rock.