基于激光点云数据的裂隙岩体渗流场的无单元法模拟

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Abstract The precise point clouds of rock surface which are obtained through three-dimensional laser scanning technology are used to get the geometric information and distribution of rock mass fracture networks. Application of penalty function method to disposing seepage boundary condition is put forward while the basic equations and the integration schemes for seepage based on element free Galerkin method(EFGM) are derived. Data for gridding nodes are obtained from coordinate transformation and vacuation of the laser point clouds. EFGM is used for the acquisition of seepage field distribution in accordance with the geometric information and mass discontinuity occurrence. This method has the following advantages：(1) Accurate fracture occurrence，location，length，opening degree and other geometric information for high and steep slope could be obtained. (2) The gridding nodes for EFGM could be directly transferred from the laser point clouds，reducing the work of generating discontinuity grids and coordinates of nodes. (3) Fracture networks are expressed by fracture permeability tensors and simulation of discontinuity with unconnected，different degrees of openings and filling is performed. On this basis，EFGM software LIDAREFM is developed with interactive data language(IDL). The massive laser point clouds handling and numerical simulation of seepage can be implemented by LIDAREFM. The numerical simulation of seepage field distribution for the bare discontinuous rock slope in Qiaozi Town，Huairou County，Beijing is carried out. The results show that the method is feasible and effective and the calculated seepage field distribution and characteristics could correctly reflect the influence of rock fractures on the seepage field of the slope rocks. Meanwhile，this method provides a new research idea for the study of the real seepage field in fractured rock.

Key words： rock mechanics rock mass discontinuity laser point cloud element free Galerkin method seepage field LIDAREFM software

Received: 04 March 2011

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I11/2330

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