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裂隙岩体渗流-损伤-断裂耦合分析与工程应用

期刊名称：岩土工程学报
时间：2010.1.15
页码：24-32
分类：TU452[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201, [2]湖南科技大学能源与安全工程学院,湖南湘潭411201, [3]中南大学资源与安全工程学院,湖南长沙410083
相关基金：基金项目：国家重点基础研究发展计划（973）项目（2007CB209400）;国家自然科学基金项目（50774093）：煤矿安全开采技术湖南省重点实验室开放基金项目（2008001）
相关项目：二次卸荷条件下扰动岩体流变损伤破坏机理研究

关键词：耦合模型, 损伤演化, FLAC3D, 裂隙岸坡, 渗透压, coupling model, damage evolution, FLAC3D, fractured bank slope, seepage pressure

中文摘要：

综合运用岩体结构力学、几何损伤力学及岩石流体力学理论，建立裂隙岩体渗流一损伤一断裂耦合数学模型（扩展FLAC3D模型），在FLAC现有计算模块的基础上，通过Fish研制了其分析程序。该模型的耦合机理：渗透水力梯度作为渗透体积力作用于损伤应力计算单元，裂隙渗透压作为面力作用于裂纹张开部分引起断续岩石裂纹的起裂，扩展导致岩体损伤演化；岩体裂纹的扩展引起岩体渗透系数的增加，导致渗流场的改变。对一复杂裂隙岸坡蓄水加载过程进行渗流一损伤一断裂耦合分析，得到不同蓄水时期，裂隙岸坡渗流场分布、损伤场的演化，初步探讨了水库蓄水过程中岸坡山体变形机制。耦合分析认为：山体变形是增量渗透力和增量浮托力共同作用于岸坡的结果；对蓄水相对高程较大的裂隙岸坡而言，库水位上升，裂隙渗透水压增加导致岩体裂纹起裂扩展，岩体损伤区增大且向岸坡深部扩展。高渗透压诱发岸坡不利断层带损伤区扩展，甚至贯通，可能是导致岸坡失稳的重要原因。

英文摘要：

By comprehensive use of the theories of structural mechanics of rock mass, geometrical damage mechanics and rock fluid mechanics, the model of seepage-damage-fracture coupling （extended FLAC3D model） is established. Based on FLAC3D existing computation modules, the programs of seepage-damage-fracture coupling in fractured rock mass are developed with the Fish language. The coupling mechanism of the model lies in that hydraulic gradient applies on the stress calculation units as permeable volume strength. Seepage pressure applies on the opening part of cracks as surface force, resulting in damage of rocks with splitting and growth of discontinuous cracks. The crack growth induces the increase of permeability coefficient, ultimately the change of seepage field. The seepage-damage-fracture coupling analysis on the fractured rock bank slope during the rising of water level in a reservoir is shown. The laws of the distribution of the seepage field and rock damage field evolution are obtained. A preliminary study on deformation of bank slope during the rising of water level in the reservoir is also made. Coupling analysis indicates that deformation of bank slope is due to the interaction of increment seepage force and increment uplift force. For the fractured bank slope with relatively high elevation of water storage, the increase of seepage pressure in fractures leads to the starting growth and propagation of damage zone. High seepage pressure leads to the growth of damage zone in unfavorable fault zone and even to the penetration. It may be the important reason for the instability of bank slopes.

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