| 摘要: |
| ［摘 要］ 【目的】 〖JP2〗研究降雨条件下黏性土坡位移场、应变场、微结构动态环境能场的变化及对土坡稳定性的影响。【方法】 通过室内土坡模型试验,用读数显微镜观测降雨前后土坡内45个测点的位移,特意选择并全程观测斜坡面（1个）、坡脚（2个）、坡底（1个）的4个测点的位移，研究侧向位移和竖向位移随时间的变化,利用反分析方法分析土坡的位移场与应变场的变化，从宏观、中观、微观角度上分析黏性土坡微结构动态环境能场及外部环境条件变化与其内在介质环境变化之间的关系。【结果】 降雨条件下坡顶和坡脚处土体的损伤程度较大，最大竖向位移发生在坡脚处；用常规方法分析土坡变形时会低估瞬时变形而夸大固结变形；由斜坡面、坡脚和坡底的蠕变曲线可见，降雨初期的瞬时竖向位移和侧向位移增长较快，但随着降雨时间的延长，土坡微结构受到损伤，竖向位移和侧向位移的增长变慢，最后趋于稳定。【结论】 降雨引发的土坡滑移大多数是瞬时的,土坡的蠕变既是土体损伤的过程，也是土坡微结构能量耗散的过程。因降雨劈裂力的作用，在坡顶及斜坡面上会出现裂缝,而斜坡面和坡脚是最容易诱发险情的部位。 |
| 关键词: ［关键词］黏性土坡 微结构动态环境能场 土坡稳定性；模型试验 降雨 蠕变 |
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| Analysis of microstructure dynamic environmental energy-field of clays-soil slope under rainfall |
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| Abstract: |
| Abstract:【Objective】 Displacement field,strain field,the microstructure dynamic environmental energy field,and their influence on the stability of clays soil slope were studied under rainfall.【Method】 Model tests were made in laboratory.During the whole testing process,displacements of 45 observation points of soil slope were obtained by reading microscope under rainfall.It should be noted that 4 observation points were selected specially,which were located at the inclined slope,under the bottom of slope,and at the toe of slope,to study the variation of the lateral and vertical displacement with time.Inverse analysis method was used to obtain the strain field of soil slope.The intrinsic relationship among the microstructure dynamic environmental energy field,external environmental condition and environmental medium were analyzed based on macrostructure,middle structure and microstructure.【Result】 Beneath the top and toe of clays soil slope under rainfall,damage becomes serious.The bigger vertical displacement occurred is in the toe of slope,test results show that the routine method,regardless of damage,underestimates the immediate deformation and overestimates the consolidation deformation.It can be seen from creep curve of beneath the inclined slope,toe of slope and bottom of slope that at the beginning of rainfall,the lateral and vertical displacement increases rapidly.With the increase in time,microstructure of soil slope is damaged,then the lateral and vertical displacement increases slowly,finally tends to remain steady.【Conclusion】 Conclusions are made that the slope sliding of clays soil happens immediately under rainfall in most cases.Creep of soil slope can be considered as the process,during which damage occurs and energy dissipates under rainfall.Cracks emerges on the top and inclined slope of soil,the most dangerous positions are the inclined slope and the toe of slope,which are subject to collapse. |
| Key words: Key words:clays soil slope microstructure dynamic environmental energy field stability of clays soil slope model test rainfall creep |
