正交各向异性岩体裂纹扩展的扩展有限元方法研究

被引:34
作者
师访 [1 ,2 ]
高峰 [1 ,2 ]
杨玉贵 [1 ,2 ]
机构
[1] 中国矿业大学深部岩土力学与地下工程国家重点实验室
[2] 中国矿业大学力学与建筑工程学院
关键词
扩展有限元法; 裂纹; 正交各向异性; 断裂力学;
D O I
10.16285/j.rsm.2014.04.001
中图分类号
O346.1 [断裂理论];
学科分类号
070301 [无机化学];
摘要
石油开采和非常规天然气开采等领域经常遇到页岩、砂岩等沉积岩,这类岩石材料往往具有正交各向异性特征。采用扩展有限元方法研究了正交各向异性岩体裂纹扩展问题,并基于Matlab平台编写了数值计算程序Betaxfem2D。将由复变函数法得到的裂纹尖端渐进位移场作为裂尖位移增强函数,用相互作用积分法计算混合模式应力强度因子,采用修改后的最大周向拉应力扩展准则确定裂纹扩展方向。与传统有限元方法的对比表明,扩展有限元方法达到相同计算精度需要的自由度少,节省计算机时。分别采用扩展有限元程序和传统有限元程序模拟了岩石试件4点弯曲试验,二者所得结果一致。数值试验表明:随着正交材料坐标系与空间坐标系夹角α的增大,裂纹扩展方向角?按照周期为?的近似正弦函数的规律变化;保持剪切模量和泊松比不变时,正弦函数的值域随着弹性模量比值E1/E2的减小而缩小,但相位基本保持不变;研究沉积岩断裂力学问题时,岩石的正交各向异性特征不可忽略。
引用
收藏
页码:1203 / 1210
页数:8
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