加载方式和压力差对类软岩稳态蠕变率影响的实验研究

Experimental study on influence of loading mode and pressure difference on steady state creep of similar soft rock

为研究加载方式和压力差对类软岩蠕变稳态率的影响,统一配制类软岩试件,采用分别加载和分级加载的方法进行单轴和三轴蠕变实验。利用Boltzman n迭加原理对原始实验结果进行处理,建立了稳态蠕变率与压力差的关系函数表达式。结果表明,加载历史是造成类软岩分级加载和分别加载稳态蠕变率大小不同的原因,类软岩在轴压和围压不同组合关系作用下,稳态蠕变率大小呈交替变化。研究结果可为矿区巷道及相关地下工程建设,深部能源开发、开采提供参考。

In order to study the influence of loading mode and pressure difference on the steady state creep rate of similar soft rock,the uniaxial and the three-axial creep tests are carried out on the similar soft rock samples by separate and stepwise-incremental loadings,respectively.The original experimental results are processed by the Boltzmann superposition method,and the function expression of the relation between the steady state creep rate and the pressure difference is established.The results show that the loading history is the cause of different steady state creep rate of similar soft rock under different loading modes.Besides,under the action of different combinations of axial pressure and confining pressure,the steady state creep rate of the similar soft rock is alternately changed.The present work has great guiding significance for the mine roadway and related underground engineering construction,and has reference value for the deep energy development.