臺灣博碩士論文加值系統

本研究以自行研發之動力三軸試驗儀，對台北盆地北投地區基隆河黏土進行室內試驗，求取動態強度。並於動態載重作用完畢後，打開排水閥，排出所激發之超額孔隙水壓，求取體積應變，以評估地震後之沈陷。試驗結果顯示等向壓密試體在動態載重作用下之破壞是由於反覆軸向應變過大所導致；而非等向壓密試體在動態載重作用下，在初始剪應力較大之情況下，試體破壞是由於殘餘軸向應變過大所導致；試驗結果顯示超額孔隙水壓之上升速率隨著應力反轉程度變大而增加；且超額孔隙水壓消散所導致之體積應變，在應力控制之條件下，不論為等向壓密或非等向壓密室體，都隨著最大反覆剪應變變大而增加。

The study is to investigate the soil dynamic strength of Peitou region in Taipei Basin. These tests were have been performed by self-developed stress-controlled triaxial mechine. In order to evaluate the post earthquake settlement, the drained valves are opened after dynamic loading completed, then and excess pore water pressure dissipates with time and induce volumetric strain. Testing results indicate the isotropic consolidated speciman failure at large cyclic axial strain, the anisotropic consolidated speciman failure at large residual axial strain. The excess pore water pressure raising-rate increases with the increasing degree of stress reversal. The post cyclic volumetric strain also increases with the increasing maxium shear strain in the stress-controlled test.

目錄
內容 頁次
中文摘要………………………………………………………………Ⅰ
英文摘要………………………………………………………………Ⅱ
目錄……………………………………………………………………Ⅲ
圖目錄………………………………………………………………….Ⅴ
表目錄………………………………………………………………….Ⅷ
符號說明……………………………………………………………….Ⅸ
第一章 緒論…………………………………………………………….1
1-1 前言……………………………………………………………1
1-2 研究方法………………………………………………………2
1-3 論文內容………………………………………………………2
第二章 文獻回顧……………………………………………………….3
2-1 以動力三軸模擬有初始條件下之動態荷載…………………3
2-2 黏土之動態強度………………………………………………3
2-3 應變速率與黏土強度之關係…………………………………4
2-4 超額孔隙水壓之激發…………………………………………4
2-5 初始剪應力對動態強度之影響………………………………6
2-6 初始剪應力下土壤在動態載重作用下之弱化行為…………7
2-7 黏土強度之衰減………………………………………………8
2-8 黏土於動態載重後再壓密之行為……………………………9
2-9 黏土動態載重後之不排水剪力強度……………………..… 11
第三章 室內試驗………………………………………………………25
3-1 研究場址……………………………………………………...25
3-2 試驗內容……………………………………………………...25
3-3 試驗儀器…………………………………………………….26
3-4 試驗方法…………………………………………………….29
3-5 資料處理…………………………………………………….31
第四章 試驗結果……………………………………………………..39
4-1 典型之黏土動態強度試驗結果…………………………….39
4-2 動態載重與靜態載重之應力-應變曲線……………………40
4-3 動態強度曲線……………………………………………….40
4-4 超額孔隙水壓……………………………………………….41
4-5 附加剪應力對反覆剪應變之影響…………………….……42
4-6 黏土強度之衰減…………………………………………….42
4-7 壓密應力對對動態強度曲線之影響……………………….43
4-8 剪力模數與有效應力之關係……………………………….43
4-9 不同黏土衰減參數之比較………………………………….44
4-10 試體承受動態載重後之再壓密行為……………………...44
第五章 結論與建議…………………………………………………..59
5-1 結論………………………………………………………….59
5-2 建議………………………………………………………….60
參考文獻……………………………………………………………….61

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