水利学报
水利學報
수리학보
2013年
7期
772-778
,共7页
王子健%刘斯宏%王怡舒%孔维耀
王子健%劉斯宏%王怡舒%孔維耀
왕자건%류사굉%왕이서%공유요
细观结构%颗粒材料%离散单元法%力链%土体骨架%应力路径
細觀結構%顆粒材料%離散單元法%力鏈%土體骨架%應力路徑
세관결구%과립재료%리산단원법%력련%토체골가%응력로경
microstructure%granular material%DEM%force chain%soil skeleton%stress path
用离散单元法对颗粒材料的双轴压缩试验进行了模拟,分析了不同应力状态时颗粒材料细观结构的发展规律。由经典土力学中土体骨架的细观表达出发,延伸出一种表述结构力链的数学统计参数。研究了该参数在不同应力路径下的变化趋势,验证了该参数对于描述颗粒材料细观结构的合理性,并从细观结构的角度解释了破坏滑动面产生的原理。通过定量描述加载过程中土体内部力链结构的变化,建立细观与宏观之间的关系,从细观机理上解释了宏观试验中破坏滑动面一般呈现45°+φ/2左右的事实,为今后从细观结构角度研究土体宏观特性提供了一个新的思路。
用離散單元法對顆粒材料的雙軸壓縮試驗進行瞭模擬,分析瞭不同應力狀態時顆粒材料細觀結構的髮展規律。由經典土力學中土體骨架的細觀錶達齣髮,延伸齣一種錶述結構力鏈的數學統計參數。研究瞭該參數在不同應力路徑下的變化趨勢,驗證瞭該參數對于描述顆粒材料細觀結構的閤理性,併從細觀結構的角度解釋瞭破壞滑動麵產生的原理。通過定量描述加載過程中土體內部力鏈結構的變化,建立細觀與宏觀之間的關繫,從細觀機理上解釋瞭宏觀試驗中破壞滑動麵一般呈現45°+φ/2左右的事實,為今後從細觀結構角度研究土體宏觀特性提供瞭一箇新的思路。
용리산단원법대과립재료적쌍축압축시험진행료모의,분석료불동응력상태시과립재료세관결구적발전규률。유경전토역학중토체골가적세관표체출발,연신출일충표술결구력련적수학통계삼수。연구료해삼수재불동응력로경하적변화추세,험증료해삼수대우묘술과립재료세관결구적합이성,병종세관결구적각도해석료파배활동면산생적원리。통과정량묘술가재과정중토체내부력련결구적변화,건립세관여굉관지간적관계,종세관궤리상해석료굉관시험중파배활동면일반정현45°+φ/2좌우적사실,위금후종세관결구각도연구토체굉관특성제공료일개신적사로。
A biaxial compression test on granular materials is numerically simulated by DEM. The evolution of the microstructures of granular materials under different stress states is analyzed. A statistical parameter which characterizes the force chain structures is extended based on the microscopic expression of the soil skeleton in the soil mechanics. The evolutions of the proposed parameter under different stress paths are studied, and the rationality of the parameter to characterize the microstructure of the granular materials is verified. From which the mechanism of generation of sliding surface is explicated. Through describing the revolution of the force chain structures, the relationship between the microscopic and macroscopic views is set up,which explains the facts that the destroied sliding surface generally present around 45°+φ/2 in mac-roscopic trial from the mesoscopic mechanism, leading to a new idea to study the soil properties from the microscopic view.