岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2014年
3期
689-695
,共7页
土-水特征曲线%干湿循环%预测%变形%强度
土-水特徵麯線%榦濕循環%預測%變形%彊度
토-수특정곡선%간습순배%예측%변형%강도
soil-water characteristic curve(SWCC)%drying and wetting cycles%prediction%deformation%strength
目前对于土体的干湿循环过程中变形、强度变化规律研究较多,而对经过多次干湿循环后土-水特征曲线的试验研究较少。由于吸力平衡需要时间太长,对干湿循环过程中土-水特征曲线的研究也多限于单次的干湿循环试验。但考虑到实际岩土工程中气候条件的多变性和自然环境的复杂性,一般土体均要经历多次干湿循环,因此,对多次干湿循环后的土-水特性曲线研究显得非常重要。结合已有的试验数据总结脱湿曲线与吸湿曲线随着干湿循环次数的变化规律,通过引入一个与干湿循环次数有关的函数,提出能预测多次干湿循环后土-水特征曲线的方法。本方法仅需土-水特征曲线的首次干湿循环脱湿与吸湿曲线和塑性指数,就可以预测多次干湿循环后的土-水特征曲线。
目前對于土體的榦濕循環過程中變形、彊度變化規律研究較多,而對經過多次榦濕循環後土-水特徵麯線的試驗研究較少。由于吸力平衡需要時間太長,對榦濕循環過程中土-水特徵麯線的研究也多限于單次的榦濕循環試驗。但攷慮到實際巖土工程中氣候條件的多變性和自然環境的複雜性,一般土體均要經歷多次榦濕循環,因此,對多次榦濕循環後的土-水特性麯線研究顯得非常重要。結閤已有的試驗數據總結脫濕麯線與吸濕麯線隨著榦濕循環次數的變化規律,通過引入一箇與榦濕循環次數有關的函數,提齣能預測多次榦濕循環後土-水特徵麯線的方法。本方法僅需土-水特徵麯線的首次榦濕循環脫濕與吸濕麯線和塑性指數,就可以預測多次榦濕循環後的土-水特徵麯線。
목전대우토체적간습순배과정중변형、강도변화규률연구교다,이대경과다차간습순배후토-수특정곡선적시험연구교소。유우흡력평형수요시간태장,대간습순배과정중토-수특정곡선적연구야다한우단차적간습순배시험。단고필도실제암토공정중기후조건적다변성화자연배경적복잡성,일반토체균요경력다차간습순배,인차,대다차간습순배후적토-수특성곡선연구현득비상중요。결합이유적시험수거총결탈습곡선여흡습곡선수착간습순배차수적변화규률,통과인입일개여간습순배차수유관적함수,제출능예측다차간습순배후토-수특정곡선적방법。본방법부수토-수특정곡선적수차간습순배탈습여흡습곡선화소성지수,취가이예측다차간습순배후적토-수특정곡선。
Many researchers focus on deformation and strength of the soils experienced wetting and drying cycles. But few researches have been conducted on soil-water characteristic curve of the soils experienced wetting and drying cycles. Because the processing of suction equalization takes too long time, the studies of soil-water characteristic curve of the soils experienced drying and wetting cycles are mostly limited to a single wetting and drying cycle. But considering the variability of the actual climatic conditions encountered in geotechnical engineering and the complexity of natural environment, generally soils experience many drying and wetting cycles. Therefore the study of the soil-water characteristic curves of soils experienced many drying and wetting cycles is significant. On the basis of the existing experimental data about the variation of the drying and wetting curves with the numbers of drying and wetting cycles, a method is proposed by introducing a function of the number of drying and wetting cycle, which is capable of predicting the soil-water characteristic curve of soils experienced drying and wetting cycles. Once the first drying and wetting curves and plasticity index of the soil are given, the method can predict the soil-water characteristic curve of the soils experienced drying and wetting cycles.