A new discrete fracture modelling approach for rock masses
A new discrete fracture modelling approach for rock masses
复制标题
一种新的岩体离散断裂建模方法
DOI：
10.1680/geot.2007.57.9.757
复制
发表时间：
2007
期刊：
影响因子：
5.8
通讯作者：
J. Rance
中科院分区：
文献类型：
--
作者：
R. Pine;D. Owen;J. Coggan;J. Rance
本文提出了一种在拉、压应力场中模拟岩体离散断裂的方法，该方法基于压缩状态下的Mohr-Coulomb破坏面和拉伸状态下的三个独立的各向异性旋转裂纹模型。拉伸断裂是通过耦合各向异性旋转裂纹破坏准则的软化到压缩塑性应变演化来模拟的。一个显式的时间积分耦合离散元/有限元方法采用显式拉格朗日接触算法，以执行非穿透的表面时，产生的拉伸强度耗尽。地质力学模型适用于天然裂隙岩体，其特点是现场测绘和钻孔数据集成在一个随机的三维离散裂隙网络模型。这种方法最大限度地利用现场数据，并提供了一个直接的方法来确定岩体强度和变形。它还提供了一个现实的洞察复杂的故障我。
A method for modelling discrete fracture in rock masses under tensile and compressive stress fields is presented, based on a Mohr–Coulomb failure surface in compression and three independent anisotropic rotating crack models in tension. Extension fracturing is modelled by coupling the softening of the anisotropic rotating crack failure criterion to the compressive plastic strain evolution. An explicitly time-integrated coupled discrete element/finite element approach is employed with an explicit Lagrangian contact algorithm to enforce non-penetration of the surfaces created when the tensile strength is depleted. The geomechanical model is applied to naturally fractured rock masses, which are characterised by field mapping and borehole data integrated in a stochastic 3D discrete fracture network model. This approach maximises the utility of the field data and provides a direct approach to the determination of rock mass strength and deformability. It also provides a realistic insight into complex failure me...