【摘 要】
：
For the purpose of describing the deformation characteristics of rocks, the effect of volume changes on mechanical properties of rocks should be taken into acco
【基金项目】
：
the National High-Tech Research and Development Program of China
论文部分内容阅读
For the purpose of describing the deformation characteristics of rocks, the effect of volume changes on mechanical properties of rocks should be taken into account with relation to the development of constitutive model. Firstly, rocks are divided into three parts, i.e., voids, a damaged part and an undamaged part in the course of loading. The void ratio was applied to describing the changes of voids or pores during the deformation process. Then, using statistical damage theory, a constitutive model was developed for rocks to describe their strain softening and hardening on the basis of investigating the relationship between the net stress and apparent stress, in which the influence of volume changes on rock behavior was correctly taken into account, such as the initial phase of compaction and the latter stage of dilation. Thirdly, a method of determining model parameters was also presented. Finally, this model was used to compare the theoretical results with those observed from experiments under conventional triaxial loading conditions.
其他文献
钢筋混凝上结构在目前的工业与民用建筑中占了很大的比重。但由于混凝土这种材料的特性，以及设计和施工中某些措施的不当，产生裂缝也相当普遍。所以研究混凝土结构裂缝的产生机
Serial material model (Dilute model)and Limited Units (LU)method were employed to analyze the performance of binary piezo-composite system. The reckoned electri
本文通过具体的工程实例,对小直径钢管桩基础在市中心区人行天桥的施工进行了介绍,总结了应用中的成功经验,探讨了小直径钢管桩在人行天桥桩基础中的应用.
In order to evaluate and integrate travel time reliability and capacity reliability of a road network subjected to ice and snowfall conditions, the conceptions
你是否感受到人类正越来越干渴。根据联合国统计，全球淡水消耗量自20世纪初以来增加了6～7倍，比人口增长速度高2倍，全球目前有14亿人缺乏安全清洁的饮用水．其中约3亿人生活在极度缺
A series of Mn-doped TiO_2 nanowires (NWs) were prepared by hydrothermal method at the mole fraction of Mn changing from 0 to 12.0%. X-ray powder diffraction (X
考虑了微网中微电源(分布式电源)出力的随机性,建立了微网运行时微电源的容量充裕度的风险评估模型,并且提出将微电源与可中断负荷协调控制的思路,综合考虑微电源投资、微电
In the present study, the flow field around a circular pier is investigated with experimental measurements and numerical simulations.The transient flow patterns
Guidong granitic complex is constituted by Luxi intrusion, Xiazhuang intrusion, Maofeng intrusion, Sundong intrusion, Aizi intrusion and Siqian intrusion, which
YVO_4:Er~(3+), Yb~(3+) with varying Yb3+ concentrations were prepared by a precipitation method. The results of X-ray difffaction (XRD) show that all the sample