基于连续介质的裂隙岩体流固耦合数值分析

发布时间：2018-07-08 15:51

本文选题：滑坡 + 渗透压力　；参考：《中南大学学报(自然科学版)》2016年11期

【摘要】：基于库区水位涨落或暴雨入渗,经过演变易造成滑坡,研究渗透压作用下裂隙损伤效应对渗透张量的影响,通过理论推导,提出裂隙岩体渗流场与损伤场耦合的分析模型;以湖北潘口水电站进水口边坡为研究对象,建立基于连续介质的裂隙岩体流固耦合渗流数值计算分析方法。研究结果表明:边坡在开挖过程中变形以卸荷回弹变形为主,回弹变形范围随开挖逐级增大,各级边坡开挖对邻级边坡变形的影响最显著,对较远坡段的影响逐步减弱;边坡开挖面基本处于小拉应力状态,边坡浅表层拉应力区分布范围及量值均很小;边坡全部开挖完成后,边坡的塑性区主要沿近坝的开挖马道外缘分布,分布范围小,在表层岩体内;裂隙岩体流固耦合模型的三维数值计算能够较真实地模拟边坡开挖过程位移场、应力场、塑性区、拉应力区的分布规律。
[Abstract]:Based on the fluctuation of water level in reservoir area or the infiltration of rainstorm, it is easy to cause landslide through evolution. The influence of fracture damage effect on permeable Zhang Liang under osmotic pressure is studied. Through theoretical derivation, an analytical model of coupling seepage field and damage field of fractured rock mass is put forward. Taking the intake slope of Pankou Hydropower Station in Hubei Province as the research object, a numerical calculation and analysis method for fluid-solid coupling seepage of fractured rock mass based on continuous medium is established. The results show that the deformation of slope is mainly unloading and springback deformation, and the range of springback deformation increases with the excavation step by step. The influence of slope excavation on adjacent slope deformation is the most significant, and the influence on the far slope is gradually weakened. The excavating surface of the slope is basically in the state of small tensile stress, the distribution range and quantity of the tensile stress zone of the shallow surface of the slope are very small, and after all the excavation of the slope is completed, the plastic zone of the slope mainly distributes along the outer edge of the excavation track near the dam, and the distribution range is small. The three-dimensional numerical calculation of fluid-solid coupling model of fractured rock mass in the surface rock body can simulate the distribution of displacement field, stress field, plastic zone and tensile stress region in the excavation process of slope.
【作者单位】：中南大学地球科学与信息物理学院;中国电建集团中南勘测设计研究院有限公司地质工程处;长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金资助项目(51508042)~~
【分类号】：TV223

【相似文献】