岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2015年
z1期
2759-2766
,共8页
岩石力学%双重孔隙-裂隙介质%强度异向性%弹塑性模型%热-水-应力耦合%有限元分析
巖石力學%雙重孔隙-裂隙介質%彊度異嚮性%彈塑性模型%熱-水-應力耦閤%有限元分析
암석역학%쌍중공극-렬극개질%강도이향성%탄소성모형%열-수-응력우합%유한원분석
rock mechanics%dual-pore-fracture medium%strength anisotropy%elasto-plastic model%thermo- hydro-mechanical coupling%FEM analysis
计入裂隙连通率，进一步完善了确定双重孔隙–裂隙介质岩体的黏聚力及内摩擦角的方法，将其引入独立开发的热–水–应力耦合二维弹塑性有限元程序中。假定一个位于饱和岩体中的实验室尺度的核废物地质处置库模型，以此为计算背景，拟定裂隙组正交和斜交的二种情况，进行热–水–应力耦合有限元分析。结果表明：与裂隙组正交时的各场量呈轴对称分布相比，两组裂隙斜交时，孔隙水压力及其流速呈轴对称分布，但岩体中的应力场、裂隙水压力及其流速、塑性区均呈非轴对称分布；裂隙组正交时岩体中的塑性区大面积出现，而裂隙组斜交时岩体中几乎无塑性区产生；岩体中裂隙组的产状强烈地影响到应力场、塑性区和裂隙水的状态。
計入裂隙連通率，進一步完善瞭確定雙重孔隙–裂隙介質巖體的黏聚力及內摩抆角的方法，將其引入獨立開髮的熱–水–應力耦閤二維彈塑性有限元程序中。假定一箇位于飽和巖體中的實驗室呎度的覈廢物地質處置庫模型，以此為計算揹景，擬定裂隙組正交和斜交的二種情況，進行熱–水–應力耦閤有限元分析。結果錶明：與裂隙組正交時的各場量呈軸對稱分佈相比，兩組裂隙斜交時，孔隙水壓力及其流速呈軸對稱分佈，但巖體中的應力場、裂隙水壓力及其流速、塑性區均呈非軸對稱分佈；裂隙組正交時巖體中的塑性區大麵積齣現，而裂隙組斜交時巖體中幾乎無塑性區產生；巖體中裂隙組的產狀彊烈地影響到應力場、塑性區和裂隙水的狀態。
계입렬극련통솔，진일보완선료학정쌍중공극–렬극개질암체적점취력급내마찰각적방법，장기인입독립개발적열–수–응력우합이유탄소성유한원정서중。가정일개위우포화암체중적실험실척도적핵폐물지질처치고모형，이차위계산배경，의정렬극조정교화사교적이충정황，진행열–수–응력우합유한원분석。결과표명：여렬극조정교시적각장량정축대칭분포상비，량조렬극사교시，공극수압력급기류속정축대칭분포，단암체중적응력장、렬극수압력급기류속、소성구균정비축대칭분포；렬극조정교시암체중적소성구대면적출현，이렬극조사교시암체중궤호무소성구산생；암체중렬극조적산상강렬지영향도응력장、소성구화렬극수적상태。
A method of determining the cohesion and internal friction angle of a dual-pore-fracture rock mass was improved by considering fracture connection ratio,and this method was introduced into the elasto-plastic thermo-hydro-mechanical(THM) coupling finite element method(FEM) code. Aiming at a model of hypothetical nuclear waste repository in a saturated dual-pore-fracture rock mass with a laboratory scale,the THM coupling FEM analyses were carried out for two assumed cases withorthogonal fracture sets and oblique-cross fracture sets,respectively. The results show that:compared with the axisymmetric distributions of various field quantities in the case with orthogonal fracture sets,the distributions of pore pressures and flow velocities of underground water are axisymmetric,but the distributions of stresses,fracture pressures and relative flow velocities,plastic zones in the rock mass are non-axisymmetric for the case with oblique-cross fracture sets. A large area of plastic zone occurs in the case with orthogonal fracture sets,but almost no plastic zone is produced in the case with oblique-cross fracture sets. The occurrence of fracture sets strongly influences the states of stress,plastic zone and fracture pressure in rock mass.
