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为研究充填膏体的蠕变硬化特性,对采用特定配比制成的充填膏体试样进行含水率与密度、单轴压缩与单轴压缩蠕变、电镜扫描等系列试验研究。结果表明:试验试样含水率及密度呈正态分布,离散性小,其单轴压缩强度与密度和含水率均无相关性;蠕变过程中,充填膏体随应力水平提高水平间弹性阶段应变率减小而瞬时变形模量增大,每个应力水平加载2,4及8 h时,瞬时变形模量增长率分别为1.17×105%,1.21×105%,1.23×105%,平均为1.20×105%;加载时长为2,4和8 h时,充填膏体有效模量强化系数分别为0.813 9,0.873 7,0.911 8,平均为0.866 5;蠕变过程中试样内部结构调整趋于压密闭实、裂纹扩展发生偏转汇聚,蠕变硬化大于损伤;充填膏体在加载时长为2,4及8 h时,蠕变系数分别为1.06,1.16及1.20,平均蠕变系数为1.14。
In order to study the creep and hardening properties of the filling paste, a series of experimental studies were conducted on the samples of filled paste with a specific ratio for moisture content and density, uniaxial compression and uniaxial compression creep, and electron microscope scanning. The results show that the moisture content and density of the test sample are normal distribution and the dispersivity is small. The uniaxial compressive strength has no correlation with the density and water content. During the creep process, the filling paste increases with the stress level, The strain rate decreases and the instantaneous modulus of deformation increases. The rate of instantaneous modulus of deformation increases 1.17 × 105%, 1.21 × 105% and 1.23 × 105% respectively at 2,4 and 8 h of loading, with an average of 1.20 × 105%. When the loading time is 2, 4 and 8 h, the effective modulus of filling paste is 0.813 9, 0.873 7 and 0.911 8, respectively, with an average of 0.866 5. During the creep process, When the loading time is 2, 4 and 8 h, the creep coefficients are 1.06, 1.16 and 1.20 respectively, and the average creep coefficient is 1.14.