泥质页岩注浆结石体的蠕变特性试验研究

在分析已有软岩蠕变机制成果的基础上,为了研究软岩注浆结石体的蠕变特性,分析了不同荷载水平以及不同含水条件对泥质页岩注浆结石体蠕变特性的影响。试验结果表明:1)在相同含水率状态下,蠕变变形随着荷载水平的增加而增大;软岩注浆结石体不同蠕变特性曲线间的转换存在一个荷载阈值,当荷载小于该阈值时,蠕变为稳定蠕变,大于该阈值时试样进入加速蠕变且短时间内直接破坏。2)在相同荷载水平下,随着含水率的增加,蠕变变形逐渐增大且变形增长速率较快。低应力等级下含水率对注浆结石体的蠕变特性影响较大,而高应力下的影响相对较小。3)Burgers模型可以较好地描述注浆结石体的蠕变特性。

Experimental study on the creep property of grouting concretion stone of argillaceous shale

In order to study the creep characteristics of soft rock grouting concretion stone, the influence of different load levels and different moisture conditions on the grouting creep characteristics of the grouting concretion stone of argillaceous shale is analyzed on the basis of the existing research results of soft rock creep mechanism. The results show that: 1) Under the same moisture condition, the creep deformation increases with load level increasing. There is a load threshold which switches the different creep characteristics curve shapes of grouting concretion stone, when the load is smaller than the threshold, the creep is under the stable state, otherwise the grouting concretion stone will turn into the accelerated creep stage and is directly damaged in a short time. 2) Under the same load condition, the creep deformation and the growth rate gradually increases with the increase of moisture content. Moisture content make a greater influence on the creep properties of grouting concretion stone under low level stress, but it makes little influence under high level stress. 3) Burgers model can describe the creep characteristics of grouting concretion stone preferably.