一种模拟岩石蠕变的数值流形方法

为了保障岩土工程结构能长期正常使用，需要对其蠕变变形进行分析。“时步-初应变”法是一种常用的计算岩石蠕变的方法。数值流形方法是一种新兴的数值计算方法，常用于计算节理岩体的变形，但尚未被试用于计算蠕变变形。在原数值流形方法的程序中增加了基于“时步-初应变”法的计算模块，通过对广义开尔文模型进行的模拟，显示新程序可以正确反映岩石的黏弹性蠕变趋势，并能够计算包含节理的岩体的蠕变变形，改进后的数值流形方法不但能够模拟岩石的线弹性变形，而且可以模拟岩石的黏弹性蠕变，比原流形方法更能全面地模拟岩石的变形，扩展了数值流形方法在岩土工程中的使用范围。

A numerical manifold method for simulating creep of rocks

To ensure the safety and normal usage of geotechnical engineering,it’s necessary to analyze the creep of rock mass.The "time step-initial strain" method is commonly used to compute the creep of rocks.Numerical manifold method(NMM) is a recently developed numerical method which is used to simulate the deformation of jointed rock mass but has not been used to analyze the creep of rocks.A "time step-initial strain" computing module has been added to the NMM code.The result of simulating the deformation of generalized Kelvin model shows that the new program can reflect the trend of viscoelastic creep of rocks and could be used to simulate the creep strain of jointed rock mass;so the adapted NMM now can compute both linear elastic and viscoelastic deformation of rock mass.It reflects rocks’ deformation trend more comprehensively,and extends the usage scope of NMM in geotechnical engineering.