摘要
高温高压花岗岩钻孔实验表明,温度低于500℃,静水应力低于150MPa状态下,岩体的钻孔变形均属于稳态蠕变变形阶段.该文选取了广义开尔文模型来反映其特征,通过拉普拉斯变换及逆变换,详细推演出了钻孔径向位移解析解,并且考虑温度-应力的耦合效应,给出了模型参数随温度及应力变化的关系式.利用该关系进行拟合计算,说明广义开尔文模型来表达高温高压环境中的花岗岩稳态蠕变变形特性,寻求蠕变参数是合理可靠的.该文对于高温岩体地热资源开发中的钻孔施工与维护、钻孔变形量预测等方面,具有实际的指导意义.
Experiments show that the drilling deformation of rock is partly in the deformation stage of steadystate creep when the temperature is below 500 °C and the hydrostatic stress is below 150 MPa.In this paper,the generalized Kelvin model is selected to reflect its characteristics.By using the Laplace transform and the inverse Laplace transform,the analytical solution of the drilling's radial displacement is obtained,and the relationship between the model parameters,the temperature and the stress are obtained by taking the temperature-stress coupling effect into consideration.After applying the relation to a fitting calculation,it is shown that the model is rational and reliable and can represent the creep deformation characteristics of the granite in steady state and be used to obtain the creep parameters of the granite under high temperature and high pressure.The results can be used in the drilling construction and maintenance,the drilling deformation prediction,and the drilling shaft lining stability analysis during the development of hot dry rock geothermal energy resources.
出处
《力学与实践》
北大核心
2014年第6期742-746,共5页
Mechanics in Engineering
关键词
花岗岩钻孔
高温静水应力
广义开尔文模型
蠕变参数
granite drill
high temperature and hydrostatic pressure
modified Kelvin mechanical creep model
creep parameter
