岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
z2期
1-17
,共17页
软黏土%蠕变%次固结%应力剪胀%微观结构
軟黏土%蠕變%次固結%應力剪脹%微觀結構
연점토%연변%차고결%응력전창%미관결구
soft clay%creep%secondary consolidation%stress-dilatancy%microstructure
大量的室内和现场试验表明软黏土存在长期变形难以收敛的问题，为了更深入地认识软黏土的蠕变特性，首先，从微观物理化学角度探讨蠕变机制；然后，深入分析一维应力条件下次固结系数的演变规律以及确定方法和三轴排水、不排水蠕变特性及黏土的长期抗剪强度、室内旁压试验和现场试验等复杂应力下的黏土蠕变特性等，并且讨论黏土蠕变特性与应变速率和应变松弛特性在一维和三轴条件下的关联性；最后，从黏土次固结特性与微观结构的相关性、如何准确描述次固结系数的非线性及蠕变过程中应力剪胀剪缩关系发展等三方面更深入地探讨软黏土蠕变特性。
大量的室內和現場試驗錶明軟黏土存在長期變形難以收斂的問題，為瞭更深入地認識軟黏土的蠕變特性，首先，從微觀物理化學角度探討蠕變機製；然後，深入分析一維應力條件下次固結繫數的縯變規律以及確定方法和三軸排水、不排水蠕變特性及黏土的長期抗剪彊度、室內徬壓試驗和現場試驗等複雜應力下的黏土蠕變特性等，併且討論黏土蠕變特性與應變速率和應變鬆弛特性在一維和三軸條件下的關聯性；最後，從黏土次固結特性與微觀結構的相關性、如何準確描述次固結繫數的非線性及蠕變過程中應力剪脹剪縮關繫髮展等三方麵更深入地探討軟黏土蠕變特性。
대량적실내화현장시험표명연점토존재장기변형난이수렴적문제，위료경심입지인식연점토적연변특성，수선，종미관물이화학각도탐토연변궤제；연후，심입분석일유응력조건하차고결계수적연변규률이급학정방법화삼축배수、불배수연변특성급점토적장기항전강도、실내방압시험화현장시험등복잡응력하적점토연변특성등，병차토론점토연변특성여응변속솔화응변송이특성재일유화삼축조건하적관련성；최후，종점토차고결특성여미관결구적상관성、여하준학묘술차고결계수적비선성급연변과정중응력전창전축관계발전등삼방면경심입지탐토연점토연변특성。
Extensive laboratory tests and field observations show that soft clay exhibits long-term deformation. For further understanding of the creep characteristics of soft clay, the mechanism of creep is first discussed from the microscopic physicochemical viewpoint. Then, the evolution of second compression coefficient and its determination under 1D condition, triaxial creep characteristics under drained and undrained conditions, long-term shear strength, and the creep characteristics under complex stress conditions are analyzed. The relevance of creep characteristics to strain-rate and strain relaxation characteristics under both 1D and 3D conditions is discussed. Finally, some new development of the creep characteristics of soft clay are presented in three aspects:the relevance of second compression coefficient to microstructure, accurate description of nonlinear creep, and the stress-dilatancy during drained and undrained creep.
