水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2015年
3期
188-191,199
,共5页
非饱和土抗剪强度%脱湿抗剪强度%折线包络面%吸湿抗剪强度
非飽和土抗剪彊度%脫濕抗剪彊度%摺線包絡麵%吸濕抗剪彊度
비포화토항전강도%탈습항전강도%절선포락면%흡습항전강도
shear strength of unsaturated soil%drying shear strength%broken-line failure envelope%wetting shear strength
非饱和土广泛分布且非饱和土强度问题日益凸显，而非饱和土力学有关强度理论尚未统一和成熟。非饱和土的抗剪强度是非饱和土土力学的重要组成部分，其强度指标是工程中重要的设计参数。利用 TKA 非饱和土直剪测试系统对非饱和重塑高液限黏土分别进行脱湿等吸力直剪试验以及吸湿等吸力直剪试验。试验研究表明，非饱和土的抗剪强度随吸力增大而呈非线性增长；提出了简单且适合工程应用的抗剪强度公式；对于同一吸力，土处在脱湿状态的抗剪强度大于其处在吸湿状态下的抗剪强度。
非飽和土廣汎分佈且非飽和土彊度問題日益凸顯，而非飽和土力學有關彊度理論尚未統一和成熟。非飽和土的抗剪彊度是非飽和土土力學的重要組成部分，其彊度指標是工程中重要的設計參數。利用 TKA 非飽和土直剪測試繫統對非飽和重塑高液限黏土分彆進行脫濕等吸力直剪試驗以及吸濕等吸力直剪試驗。試驗研究錶明，非飽和土的抗剪彊度隨吸力增大而呈非線性增長；提齣瞭簡單且適閤工程應用的抗剪彊度公式；對于同一吸力，土處在脫濕狀態的抗剪彊度大于其處在吸濕狀態下的抗剪彊度。
비포화토엄범분포차비포화토강도문제일익철현，이비포화토역학유관강도이론상미통일화성숙。비포화토적항전강도시비포화토토역학적중요조성부분，기강도지표시공정중중요적설계삼수。이용 TKA 비포화토직전측시계통대비포화중소고액한점토분별진행탈습등흡력직전시험이급흡습등흡력직전시험。시험연구표명，비포화토적항전강도수흡력증대이정비선성증장；제출료간단차괄합공정응용적항전강도공식；대우동일흡력，토처재탈습상태적항전강도대우기처재흡습상태하적항전강도。
Unsaturated soil is widely distributed and its strength problems are becoming increasingly prominent ,but the strength related theories of unsaturated soil mechanics have not been unified and developed .The shear strength of unsatu-rated soils is an important part of unsaturated soil mechanics ,its strength indexes are important design parameters in the engineering .Here ,two kinds of direct shear tests corresponding to the drying and wetting process of unsaturated high liq-uid clay ,namely drying shear strength test and wetting shear strength test ,were carried out respectively with TKA unsat-urated soil test system .The results showed that the shear strength presented a nonlinear growth along with the suction , according to which a simple and practical formula for unsaturated shear strength was put forward .Besides ,the drying shear strength was bigger than the wetting shear strength under the same suction strength .
