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姓名 張文騰(Wen-Teng Chang) 查詢紙本館藏 畢業系所 土木工程學系 論文名稱 黏性土壤受定量擠壓變形後之力學行為 相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 許多工程的進行，常會對土體施予定量之擠壓變形量。對黏性土
壤而言，受到㆒定量擠壓變形後，會激發超額孔隙水壓，造成側向土
壓力㆖升，在擠壓變形量不在增加之條件㆘，超額孔隙水壓逐漸消
散，側向土壓力隨之減少。在此㆒過程㆗，土壤之力學性質則隨之改
本研究以方形應力試驗儀進行側向擠壓試驗，對單向度壓密後土
體施加定量之側向擠壓變形後，量測擠壓方向與未受擠壓方向土壓力
之歷時變化。另外進行㆔軸軸向擠壓試驗，對徑向壓密後土體受定量
之軸向擠壓變形後，量測軸向應力σz 與超額孔隙水壓uw 隨時間的變
由試驗結果可知，土體受到定量擠壓變形後，其力學行為會由原
本以趨向被動之狀態逐漸回復至另㆒平衡之靜止土壓力狀態，側向土
壓力則趨於㆒穩定值，且此值會大於原先靜止土壓力狀態㆘之側向土
壓力；當定量擠壓變形量愈大，最終穩定狀態時擠壓方向之應力愈
大，且㆓水平應力間差距愈大。最後並以理論公式進㆒步建立穩定狀
態時，側向擠壓試驗主應力比與㆔軸軸向擠壓試驗主應力比之關係摘要(英) Soils in ground may suffer a constant deformation in construction
progress. For saturated cohesive soils, excess pore water pressure and
lateral earth pressure may increase after the deformation occured. With no
deformation occurred continuously, the lateral earth pressure decreased
gradually as excess pore water pressure dissipated. During this process,
the mechanical properties of soils are changed.
In this research, the lateral compression tests of one-dimensional
consolidation soils with a specially designed square box were carried out
to measure the elasped variation of the horizontal earth pressures. Besides,
axially compressed triaxial tests were carried out to measure the elasped
variation of the axial pressure and the excess pore water pressure .
According to the results of the tests, the mechanical properties of
soils tended to passive state after the deformation occurred, and then
varied to another new equilibrium state. Finally, the lateral earth pressures
tended to some stable values, which were larger than the lateral earth
pressure in original condition. Besides, larger deformation caused larger
variation in horizontal earth pressures. Finally, an equation was proposed
for estimating the relationships between the principal stress ratio which
were obtained from the both tests.關鍵字(中) ★ 主應力比
★ 定量擠壓變形
★ 側向土壓力
★ 穩定狀態關鍵字(英) ★ lateral earth pressure
★ constant compression deformation論文目次 英文摘要...................................................................................................II
目錄..........................................................................................................III
表目錄.......................................................................................................V
圖目錄......................................................................................................VI
符號說明...............................................................................................XVI
第㆒章緒論............................................................................................1
1.1 研究動機與目的...........................................................................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 靜止土壓力...................................................................................3
2.1.1 靜止土壓力係數之定義........................................................3
2.1.2 靜止土壓力之評估方式........................................................4
2.2 主動與被動土壓力.......................................................................7
2.2.1 主動與被動土壓力係數之定義............................................7
2.2.2 土壤達主動與被動破壞之應力－應變關係........................8
2.3 平面應變理論...............................................................................9
2.4 土壤受擠壓後之力學行為.........................................................11
第㆔章土樣與試驗方法......................................................................27
3.1 試驗土樣之基本物理性質.........................................................27
3.2 儀器設備.....................................................................................27
3.2.1 方形應力試驗儀..................................................................27
3.2.2 ㆔軸試驗儀..........................................................................29
3.3 試驗方法...................................................................................30
3.3.1 側向擠壓試驗......................................................................30
3.3.2 ㆔軸軸向擠壓試驗..............................................................32
3.3.3 ㆔軸壓密不排水試驗..........................................................33
第㆕章試驗結果與分析......................................................................39
4.1 側向擠壓試驗.............................................................................39
4.1.1 單向度壓密階段....................................................................39
4.1.2 側向擠壓階段........................................................................41
4.2 ㆔軸軸向擠壓試驗.....................................................................45
4.2.1 徑向壓密階段.......................................................................45
4.2.2 軸向擠壓階段.......................................................................46
4.2.3 多階施加擠壓變形量...........................................................49
4.3 側向擠壓試驗與㆔軸軸向擠壓試驗結果之歸納.....................50
第五章結論與建議............................................................................114
5.1 結論...........................................................................................114
5.2 建議...........................................................................................115
參考文獻................................................................................................116
附錄........................................................................................................120參考文獻 116
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Vol.100, No.GT3, pp.207-224(1974).指導教授 張惠文(Huei-wen Chang) 審核日期 2002-7-18 推文 plurk
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