核废料地质处置概念库锚喷支护坑道热-水-应力耦合效应的二维离散元分析  

2D distinct element analyses of thermo-hydro-mechanical coupling effects for a drift with bolt-shotcrete supporting in a conceptual nuclear waste repository

作　　者：张玉军[1] 徐刚[1] 

机构地区：[1]中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,武汉430071

出　　处：《岩土力学》2013年第S1期430-436,共7页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973)项目资助(No.2010CB732101);国家自然科学基金资助(No.51079145)

摘　　要：假定一个核废料地质处置库位于具有一定水头的饱和节理岩体中,开挖完闭施作系统锚杆和喷混凝土支护。对坑道建造和一个50年期的热-水应力(T-H-M)耦合运营过程,使用UDEC程序进行数值模拟,分析无、有支护时近场围岩中的应力、变形、塑性区、温度、渗流的变化状态,以及不同场(温度、渗流、应力)耦合条件下的锚杆和喷混凝土中的承载情况。结果显示,喷混凝土和系统锚杆支护不仅具有常规的支护功能,并且可阻滞地下水从坑道表面的自由渗出,使得围岩中塑性区减小,裂隙水压力和温度升高;相比于应力单场作用的情况,在热-水-力耦合的条件下洞室围岩的稳定性下降,支护结构的受力状况变差。It is assumed that a conceptual disposal repository for nuclear waste is located in a saturated jointed rock mass with certain water head,and a supporting system composed of rock bolts and shotcrete is installed after excavation of the drift.The construction of drift and a coupled thermo-hydro-mechanical(T-H-M) operation process of 50 years are simulated numerically by using UDEC code.The changes of stresses,displacements,plastic zones,temperatures,water flow in the rock mass of near field are analysed for cases with and without supporting;and the loading states of bolts and shotcrete are investigated under the conditions of coupling with different fields(temperature,water and stress).The results show: not only the rock bolts and shotcrete have the routine support function,but also are able to block free seepage of groundwater from the drift surface,so making plastic zone decrease,fracture pressure and temperature rise;compared with the case of action only by single stress field,the stability of surrounding rock mass is reduced,and the loading state of supporting structure is degenerated in the case of thermo-hydro-mechanical coupling.

关 键 词：核废料处置概念库 锚喷支护 热-水应力耦合 离散元 数值分析 

分 类 号：TL942.2[核科学技术—辐射防护及环境保护]