【作者】 盛芳；

【导师】 陆晓敏；

【作者基本信息】 河海大学 ， 工程力学， 2004， 硕士

【摘要】 裂隙岩体是一类常见的工程岩体，其强度、变形和稳定性主要受结构面的控制。本文采用块体单元法来模拟岩体变形的不连续性，以块体单元之间的接触缝面单元来模拟岩体中的结构面，在接触缝面单元的本构关系上引入西原模型来研究岩体的流变性质，并进行了工程应用。所做的主要工作如下： 1．系统地介绍了块体单元法的理论，进行了相关的理论公式的推导。 2．引入块体的常应变作为基本未知量，从而使计算能够考虑块体的弹性，大大增加了计算的精度。 3．将弹—粘弹—粘塑性复合流变模型——西原模型的本构关系引入块体单元法理论中，将其作为块体之间接触缝面的本构关系，进行了相关公式的推导并列出了相应的粘弹性和粘塑性阶段的计算步骤，同时进行了相应的程序编制工作。 4．在锚杆支护的加固模拟上，将锚杆视为穿越块体的特殊元件，参与块体单元协同工作，形成加锚单元的综合效应模型。将锚杆的劲度加入到系统的整体劲度矩阵中，直接而又比较客观的反映了锚杆对岩体的加固效果，并推导了相应的理论公式。 5．在上面的理论研究基础上进行了工程应用，对瀑布沟水电站大跨度地下洞室群中代表性较好的5号机组段进行了计算，取得了较好的计算效果，并对计算成果进行了分析。更多还原

【Abstract】 Joninted rock mass is one of the most common engineering rock masses. Its strength, deformation and stability are mainly controlled by the structural planes in it. In this paper, the block element method is used to simulate the discontinuities. The structural planes in rock masses are simulated by the contacted elements between block elements while the rheological property of the structural planes are considered by the usage of a complex rheological model describing elastic-viscoelastic-viscoplasticity as the constitutive relation of contacted elements. The main contents are as followings:1. The theory of the block element method is systematically presented here and its relative theoretical formulas are deduced.2. By introducing the constant strain as another basic unknown quantity besides the rigid displacement at centroid of block elements, the elasticity of bock elements can be considered and the precision are improved.3. A complex rheological model describing elastic-viscoelastic-viscoplasticity is used as the constitutive relation of contacted elements. Its relative formulas are deduced and computation procedures are listed.4. To simulate the bolt in rock masses, it is considered as a special component through block elements. Bolt cooperates with bock elements and they form the integrate model. The stiffness of the bolts are added to the integer stiffness matrix.445. The above theories are applied in the stability analysis of the 5 machine set of PuBuGou hydropower underground cavity group. The results are analyzed and they are reasonable.更多还原