The compression curves of soft clay of different disturbance degree finally intersect at 0 . 42eo 不同擾動度的壓縮曲線最終交于0 . 42e _ 0位置。
From the oedometer compression curves , the gradual damage course of soil structure is indicated apparently during loading 從固結儀壓縮曲線更可反映土體受荷后結構性的漸進破壞過程。
The research indicate that the structured soft clay has below several characteristic , the viscous strain is produced during the stage of primary consolidation and of second consolidation , and in the prophase , the relation of stress - strain - strain rate is unique , so the form of constitutive model , such as , f ( v ' , e ) = 0 , f ( ' v , e , t ) = 0 , ca n ' t describe strain behavior of soil skeleton rationally ; the time - dependent properties involve three aspects , in addition the time - dependent strain , apparent preconsolidation pressures that depend on strain rate , and the effect of creep compression on apparent preconsolidation pressures ; because of holding structural strength , the mechanics characteristic is determined by the magnitude of stress , and the compression curve is composed of several sections . by combining structural yield stress and it ' s characteristics with the improved time line model , a new one - dimensional elastic visco - plastic consolidation model is established 研究結果表明,結構性土的固結過程具有以下特性:主固結和次固結階段都包含有因土骨架的粘滯性移動而產生的變形,而且在正常固結階段,存在應力?應變?應變速率的唯一性, f ( _ v , e ) = 0 、 f ( _ v , e , t ) = 0形式的本構關系不足以描述土骨架的變形行為;固結壓縮過程中的時間效應包括三個方面的內容,除了應力應變關系與時間相關外,還包括粘滯性變形引起表觀前期固結壓力增加和屈服應力的應變速率效應;軟土的結構性使其力學特性與應力水平相關,壓縮曲線具有分段性。
As a result , the p - v curve of the target was a quasi - isentropic compression curve , which consisted of small hugoniot curves ( similar to isentropic curves ) from different original states , and was located betwee n the hungoniot curve and isentropic curve but closer to the latter . finally , on a two - stage light - gas gun , titanium alloy projectiles ( with mass of 0 . 35 ~ 2 . 80g ) were driven intact to hypervelocities as over 15km / s by 93w - ofc - tc4 - a1 - mb2 system flier - plate with graded wave impedance , although the fl 在二級輕氣炮上,利用93w - ofc一tc4一al一mb :系波阻抗梯度飛片成功將克量級( 0 . 35一2 . 809 )欽合金二級飛片發射到了15kln / s以上的超高速度,且二級飛片主體是完整性,但其平面性和飛行姿態還有待于今后的深入研究。
The systematical experimental study on the structure characteristic of soft clay from wenzhou has been carried out . based on schmermann and nagaraj ' s experimental conclusions and a large number of structure characteristic experiments of soft clay from wenzhou , an updated correction method of compression curve of disturbed soil is presented . the corrected compression curve is composed of four sections : horizontal section , elastic compression section , structure dilapidation compression section and normal compression section 結合溫州軟土進行了結構性試驗,對軟土的結構性進行了系統研究,在schmertmann和nagaraj等人實驗結論及大量溫州軟土結構性試驗的基礎上,得到了結構性軟土的四段式壓縮曲線:水平段、彈性壓縮段、結構破損突降段,正常壓縮段。
The sedimentation compression lines of natural clays , intrinsic compression lines of reconstituted clays and oedometer compression curves can be normalized by a void index , then the difference of the structural clays and reconstituted clays as well as the gradual damage course of soil structure are showed apparently 用孔隙指數來歸一化天然粘土的沉積壓縮曲線、重塑土的壓縮曲線和固結儀壓縮曲線,可以很清晰地揭示出結構性土與重塑土的內在差別、固結儀試驗中土體結構性的漸進破壞過程。
The research results show that compression curves of intact loess and man - made cement structural loess are very approached to each other on the condition of some certain moisture content and cement content , so the method of using cement as bonding material to make man - made cement structural loess is available 結果表明,在一定的含水量及水泥含量條件下,水泥結構性試樣的壓縮曲線幾乎與原狀黃土的重合,這說明,用水泥作為粘結材料人工制備結構性黃土試樣是可行的。
Finally , two examples show that , the availability and practicability of the new model is verified . the analysis of calculation result of berthiervill test embackment shows different part of compression curve have different influence upon the course of consolidation , and correct coefficient and viscous effect have great significance on deformation forecast . associated with the wenzhou airport runway engineering , the reason of increasing of pore - water pressuer in under - lying soft layer and post - construction settlement are given 最后,通過兩個工程實例的分析來說明本文模型的有效性和實用性:一是對berthiervill填土試驗場的軟基實測數據和理論成果進行對比分析,闡明考慮結構性擾動和粘滯性效應對分析天然粘土固結壓縮性的重要性;二是對溫州機場袋裝砂井超載預壓工程進行數值模擬,指出停荷預壓期間下臥層孔壓增加和工后沉降大的原因。
The physical process of generating quasi - isentropic compression on target via flier - plates with graded wave impedance might be considered as the successive overlap of a series of small shock loading waves generated by the transition layers in the flier - plate . as a result , the p - v curve of the target was a quasi - isentropic compression curve , which consisted of small hugoniot curves ( similar to isentropic curves ) from different original states , and was located between the hungoniot curve and isentropic curve but closer to the latter 波阻抗梯度飛片對靶板的壓縮過程是一系列弱沖擊加載波相繼發生作用疊加的結果,靶板由此獲得的p - v線是一組通過不同起始狀態點的hugoniot線的連線,這條連線可以近似看作是由小段小段等熵線連接而成的準等熵線。