片岩三轴蠕变特性及蠕变模型研究

在云南澜沧江流域,发育了大量的倾倒变形体。软硬岩互层的岩体结构是该流域形成倾倒变形体的重要原因。软岩的岩体力学参数是研究倾倒变形体的关键点。为了研究其变形机制,采用YSJ-01-00岩石三轴蠕变实验机,在恒温条件下,对片岩进行三轴蠕变实验;采取Burgers模型对其流变曲线进行辨识,并确定模型参数。试验结果表明,该种岩石长期强度只有瞬时强度的0.71倍。通过对实验曲线的研究,本文系统分析了片岩在蠕变条件下的变形特征和力学特征。着重探讨了加速蠕变阶段的轴向应变-应变率-偏应力关系特征。为预测和评价倾倒变形体的长期稳定性提供了重要依据。

Schist triaxial creep characteristics and Creep Model

In Yunnan Lancang River Basin, there are a large number of toppling deformation body. Interbedded soft and hard rock structure is an important reason for the formation of toppling deformation body. Therefore, the rock mechanics parameters of soft rock is one of the key points of research on it. In order to study the deformation mechanism, YSJ-01-00 rock triaxial creep testing machine is used to carry out triaxial creep experiments on schist under constant temperature condition; And Burgers model is used to identify its rheological curve, thereby determining the model parameters. The experimental results show that the long-term strength of this kind of rock is only 0.71 times the instantaneous intensity. Through study of the experimental curve, this paper systematically analyzes the deformation characteristics and mechanical characteristics of schist under creep condition. It focuses on accelerating creep stage axial strain - strain rate - partial stress relationship characteristics. To forecast and evaluate the toppling body provides an important basis for long-term stability.