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研究生:簡宜嫻
研究生(外文):Yi-hsien Chen
論文名稱:膠結不良軟岩之彈塑性模式與基礎承載模擬應用
論文名稱(外文):Elasto-plastic Model of Poorly Cemented Soft Rock and Application on Footing Bearing Capacity
指導教授:潘以文潘以文引用關係廖志中廖志中引用關係
指導教授(外文):Yii-Wen PanJyh-Jong Liao
學位類別:碩士
校院名稱:國立交通大學
系所名稱:土木工程系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:102
中文關鍵詞:軟弱岩石屈伏模式數值模擬基礎承載
外文關鍵詞:soft rockyieldingmodelnumerical simulationbearing capacity
相關次數:
  • 被引用被引用:4
  • 點閱點閱:163
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:2
因地質材料之力學特性極為複雜,其力學特性包括 (A)非線型、(B)受載後可能出現不可回復之塑性變形、(C)異向性、(D)體積受剪變化性、(E)受圍壓影響、(F)受應力歷史影響、(G)受應力軌跡影響、…等,並非簡單的力學模式所能輕易模擬。本研究所採用之模式以漸進屈伏面模式為架構,以彈塑性模式來分析軟岩受壓所產生之應變軟化與體積變化。利用此模式模擬軟岩之三軸試驗,與基礎承載行為。並採用基因演算法來求取參數。實驗資料取交大西南山區、寶二水庫及人造軟岩三軸實驗之應力應變曲線,每組試驗均取三組應力應變實驗資料同時模擬迴歸分析。並探討各參數對應力應變關係的影響。由數值模擬結果與試驗結果之比較驗證此模式之合理性與正確性。並可進一步分析在軟岩中的邊坡穩定、淺基礎、深基礎等大地工程問題。
Because of the complex behavior of geomaterial mechanical property, including non-linear, the unrecoverable plastic displacement due to pressure, anisotropy, volume variation after shear stress, the effect of confining stress, stress history and stress path etc., it is hard to model by those simple mechanic model. The elasto-plastic model, a special version of the generalized transitional yielding approach, is adopted for modeling the mechanical behavior, strain hardening and volume variation, of soft rock. The model was carried out to simulate laboratory triaxial test in soft rock and application on footing bearing capacity. Optimized calibration by genetic algorithm is proposed for determining model parameters. The results of all soft-rock experiments carried out by the geotechnical group of National Chiao-Tung University. Compare the results of simulation and testing can proof the rationality and accuracy. Further, it may analysis the other geotechnical problems such as slope sliding, shallow foundation or deep foundation.
第一章 研究動機與目的..........................1
1.1 研究動機 .............................1
1.2 研究目的 .............................2
1.3 研究流程 .............................2
第二章 文獻回顧 .............................4
2.1 軟岩的定義及特性 ....................4
2.2 組合律(Constitutive laws) ..................9
2.3 理想塑性模式(Perfect Plasticity Models)....11
2.3.1變形理論(deformation theory) ..........11
2.3.2可變異模數模式(Variable moduli models) .12
2.3.3塑性增量理論(Flow Theory) ..........12
2.3.4理想塑性模式(Perfect plastic models) .15
2.4 硬化法則(Hardening plasticity ) ..........23
2.5 屈伏面群\複屈伏面模式(Nested surface Multiple Yield Model).........................27
2.6 軟岩數值模擬 ............................31
2.6.1應力應變關係 ............................32
2.6.2漸進屈伏模式(Transitional Yielding
Approach Model) ............................33
2.7 應變軟化 ............................35
2.8基因演算法(GA)之最佳化 ...................37
第三章 軟岩力學模式之架構 ...................41
3.1屈伏函數的選定 ............................41
3.2塑性應變的推求 ............................42
3.3彈塑性勁度矩陣的推算 ...................43
3.4三面模式之幾何關係 ...................44
3.5屈伏疊代方式 ............................46
3.6硬化模數的推求 ............................48
第四章 模式之求取與探討 ...................50
4.1 模式參數標定 ............................50
4.2 基因演算法之收斂性 ...................53
4.3 彈塑性模式參數探討 ...................54
4.4 應變軟化參數探討 ...................66
第五章 彈塑性模式模擬結果 ...................69
5.1三軸實驗模擬 ............................69
5.1.1傳統三軸模擬: ............................71
5.1.2 不同應力路徑 ............................84
5.2基礎承載模擬應用 ...................86
第六章 結論與建議 ............................95
6.1 結論 .....................................95
6.2 建議 .....................................96
參考文獻 .....................................98
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