不同温度下引水隧洞围岩单轴加卸荷蠕变分析

Study on Uniaxial Loading and Unloading Creep of Surrounding Rock of Diversion Tunnel Under Different Temperature

为研究温度对岩石力学特性的影响,以辽宁朝阳白石无压引水隧洞为工程背景,采用MTS815伺服试验系统对该引水隧洞围岩(砂岩)进行不同温度环境下的单轴加卸荷蠕变试验.结果表明:砂岩瞬时应变、蠕应变均随温度的降低而减小,岩石破坏应力随温度的降低而增大;瞬弹、瞬塑应变均随荷载水平呈递增趋势,相同荷载水平下随着温度降低,瞬弹、瞬塑应变均逐渐减小;同一温度环境下,岩石的黏弹、黏塑应变均随荷载水平的增大而增大;相同荷载水平下,黏弹、黏塑应变随温度降低均逐渐减小.

To study the effect of temperature on the rock mechanics characteristics,no pressure diversion tunnel in Liaoning Chaoyang white stone as the engineering background,using MTS815 servo-controlled testing system of the diversion tunnel surrounding rock(sandstone)under different temperature conditions of uniaxial loading and unloading creep test.The results show that the sandstone instantaneous strain,creep strain decreases with the decreasing of the temperature,rock failure stress increases with the decreasing of temperature.The strain of transient elastomer and transient plastic both increase with the load level.Under the same load level,the strain of both the transient elastomer and the transient plastic gradually decreases with the decrease of temperature.Under the same temperature environment,the viscoelastic and viscoplastic strains of rocks increase with the increase of load level,while under the same load level,the viscoelastic and viscoplastic strains gradually decrease with the decrease of temperature.