岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2014年
5期
1311-1316
,共6页
土体动力本构模型%筑坝土石料%阈值应变%变形机制
土體動力本構模型%築壩土石料%閾值應變%變形機製
토체동력본구모형%축패토석료%역치응변%변형궤제
dynamic constitutive model for soils%damming earth and rocks%threshold strain%deformation mechanism
探讨Bouc-Wen土体动力模型的适用条件与参数对滞回圈的影响等。基于热力学基本定律，研究了Bouc-Wen土体动力模型的增量耗散函数表达式，讨论了不同动应变水平下某筑坝土石料的能量耗散机制。发现筑坝土石料的动力特性存在2个阈值应变，即第l和第2阈值应变。其对应的模量比分别为0.94左右及0.50～0.80之间。第2阈值应变与传统意义上以孔压升高或体积变化为标准的门槛应变相当。对进一步认识土体动应力-应变特性有一定意义。
探討Bouc-Wen土體動力模型的適用條件與參數對滯迴圈的影響等。基于熱力學基本定律，研究瞭Bouc-Wen土體動力模型的增量耗散函數錶達式，討論瞭不同動應變水平下某築壩土石料的能量耗散機製。髮現築壩土石料的動力特性存在2箇閾值應變，即第l和第2閾值應變。其對應的模量比分彆為0.94左右及0.50～0.80之間。第2閾值應變與傳統意義上以孔壓升高或體積變化為標準的門檻應變相噹。對進一步認識土體動應力-應變特性有一定意義。
탐토Bouc-Wen토체동력모형적괄용조건여삼수대체회권적영향등。기우열역학기본정률，연구료Bouc-Wen토체동력모형적증량모산함수표체식，토론료불동동응변수평하모축패토석료적능량모산궤제。발현축패토석료적동력특성존재2개역치응변，즉제l화제2역치응변。기대응적모량비분별위0.94좌우급0.50～0.80지간。제2역치응변여전통의의상이공압승고혹체적변화위표준적문함응변상당。대진일보인식토체동응력-응변특성유일정의의。
The applicable conditions of dynamic Bouc-Wen model and influence of the model parameters on hysteretic loop, etc. are discussed. Based on the laws of thermodynamics, the incremental dissipation functional expressions of Bouc-Wen dynamic model are formulated. Then the energy dissipation mechanism of damming earth and rocks are analyzed under different levels of dynamic strain;and two threshold strains are found defined as the first threshold strain and the second threshold strain respectively. The corresponding modulus ratios are around 0.94 and between 0.50-0.80. The second threshold strain is equated with the traditional threshold strain using pore water pressure build-up or volume changes as standard. It is good for the further understanding of the dynamic response of soil.
