Mechanical characteristics of columnar jointed rock at dam base of Baihetan hydropower station  

作　　者：闫东旭 徐卫亚 郑文棠 王伟 石安池 吴关叶 

机构地区：[1]Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University [2]Research Institute of Geotechnical Engineering, Hohai University [3]State Key Laboratory of Hydroscience and Hydraulic Engineering, Tsinghua University [4]Guangdong Electric Power Design Institute [5]East China Hydropower Investigation and Design Institute

出　　处：《Journal of Central South University》2011年第6期2157-2162,共6页中南大学学报（英文版）

基　　金：Projects(50979030, 50911130366) supported by the National Natural Science Foundation of China;Project(2009B14014) supported by the Fundamental Research Funds for the Central Universities in China

摘　　要：Irregular columnar jointed structure is a primary irregular columnar morphological tensile fracture. In order to study the geometric features of irregular columnar joints and the new problems in geotechnical engineering, hydraulic and hydropower engineering caused by columnar jointed basaltic mass, Voronoi graph from geometry was introduced to simulate the irregular columnar jointed basaltic mass at Baihetan hydraulic station. Discrete element software UDEC was used to simulate the whole process of rigid bearing plate test. Anisotropic constitutive of columnar joints was adopted to analyze the stress diffusion of rock mass at dam base of Baihetan. The results show that, the compaction property and hysteresis effect are well simulated based on discrete element simulation of Voronoi joint structure by UDEC. Four stages of cyclic loading and unloading process are imaged clearly. The results from in situ rigid bearing plate tests are explicated and the stress diffusion rule of anisotropic body is affected by structure surface. The elements in the stress state of 4-5 MPa are the most, about more than 35% of the total. Appropriate constitutive must be proposed to columnar jointed rock mass with different styles. It has important significance to realize the nonlinear mechanical behavior of irregular columnar jointed basaltic mass.Irregular columnar jointed structure is a primary irregular columnar morphological tensile fracture. In order to study the geometric features of irregular columnar joints and the new problems in geotechnical engineering, hydraulic and hydropower engineering caused by columnar jointed basaltic mass, Voronoi graph from geometry was introduced to simulate the irregular columnar jointed basaltic mass at Baihetan hydraulic station. Discrete element software UDEC was used to simulate the whole process of rigid bearing plate test. Anisotropic constitutive of columnar joints was adopted to analyze the stress diffusion of rock mass at dam base of Baihetan. The results show that, the compaction property and hysteresis effect are well simulated based on discrete element simulation of Voronoi joint structure by UDEC. Four stages of cyclic loading and unloading process are imaged clearly. The results from in situ rigid bearing plate tests are explicated and the stress diffusion rule of anisotropic body is affected by structure surface. The elements in the stress state of 4-5 MPa are the most, about more than 35% of the total. Appropriate constitutive must be proposed to columnar jointed rock mass with different styles. It has important significance to realize the nonlinear mechanical behavior of irregular columnar jointed basaltic mass.

关 键 词：columnar joints Voronoi graph discrete element method hysteresis effect Baihetan hydropower station stressdiffusion 

分 类 号：TV221.2[水利工程—水工结构工程]