摘要
应用先进的MTS和INSTRON刚性伺服试验机对不同灰砂比的充填体进行了常规三轴、无侧限单轴动态、静态抗压强度试验,测得了各种相关力学参数,得到了对应的荷载-位移和应力-应变全曲线,根据所得试验力学参数和压缩试验的性质,将单个试件、单位体积、单位质量的破坏能耗作为考查指标,计算了三轴和单轴抗压动态、静态加载方式下的破坏能耗,计算过程中消除了负位移产生的不利影响,通过统计回归建立和分析了围压与能耗的函数关系和不同情况下破坏能耗的变化及规律,对矿山顺利回采矿柱、维护采场及巷道顶板稳定、控制地压、防止地表塌陷、环境保护等具有现实意义。
By using of the experimental system of advanced MTS and INSTRON rigid servo-controlled testing machine, the destructive energy dissipation test under routine triaxial compression, dynamic and static unconfined uniaxial compression condition of backfills with different cement-sand ratios in the special large-sized stope were made; all kinds of correlative mechanical parameters, full curves of load-displacement and stress-strain were obtained after test. According to the obtained mechanical testing data and the characters of compression experimentation, taking the destructive energy dissipation of single specimen, unit volume, unit weight as check indexes, the different energy dissipation parameters under complicated compression stress conditions of backfill are calculated; the change rules of destructive energy dissipation are analyzed; and the function connection under different loading conditions after statistic regress is set up. It has definite realism meaning to ore pillar mining with safety, maintenance roof＇s stabilization of stope and tunnel, geostatic control, prevent ground sink, environment protection so as to break a new path to use the viewpoint of energy dissipation to analyze and study destruction of backfill, which are of a certain instructive importance to mine improving the quality of backfill, including other concrete engineering fields.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第3期737-742,共6页
Rock and Soil Mechanics
关键词
刚性试验机
力学试验
力学参数
能耗特征
rigid testing machine
mechanical test
mechanical parameters
energy dissipation property
