School of Resources and Safety Engineering,China University of Mining and Technology ( Bejing) School of Mining
Engineering,North China University of Science and Technology Hebei Provincial Key Lab of Mining Development and
Safety Technology

为研究分析水对泥质粉砂岩物理力学性能的影响,选取干燥、自然和饱和3种含水状态的泥质粉砂岩为研究对象,进行单轴压缩破坏和扫描电镜(SEM)试验,研究了水对岩石破裂的力学特性、破坏形式、微观结构形态的影响。研究结果表明,含水使泥质粉砂岩应力-应变曲线变化不同,弹性阶段持续时间减少,塑性屈服阶段逐渐明显;随着含水率的增加,泥质粉砂岩的峰值应力和弹性模量均呈指数减小;含水使得泥质粉砂岩软化,破坏剧烈程度降低,能量释放过程更为平和,并使其由脆性或半脆性向塑性过渡;含水使得泥质粉砂岩的微观结构发生改变,颗粒吸水膨胀,排列紊乱,结构松散,胶结物被溶解,黏聚力降低;且微观结构对泥质粉砂岩的宏观力学性能有显著影响。

In order to study and analyze water affected to the physical mechanics performances of the muddy siltstone,based on the selection on the muddy siltstone with three moisture contents of dry,natural and saturated moisture as the study object,an uniaxial compression failure and scanning electron microscope experiment were C onducted and a study was conducted on the water affected to the mechanics features of the rock fracture,failure form and micro-structure pattern.The study results showed that water bearing could make different changes in the stress-strain curves of the muddy siltstone,the sustained time of the elastic stage would be reduced and the plastic yield stage would be obvious steadily. With the moisture content increased,the peak stress and elastic modulus of the muddy siltstone would be reduced in index.The water bearing could make softening of the muddy siltstone ,the failure serious degree would be reduced,the energy released process would be mild and the muddy siltstone would be changed from fragility or semi-fragility to plasticity. The water bearing could change the micro-structure of the muddy siltstone ,the particle would be swelling with water,t he arrangement would be in disorder,the structure would be relaxed,the cementing material would be dissolved and the cohesion would be reduced.The micro-structure Wo uld have obvious influences to the macro mechanics performances of the muddy siltstone.

国家自然科学基金资助项目(51374088,51174071)；国家大学生创新创业训练计划资助项目(201210081001)；河北省自然科学基金资助项目(E2012209047)；河北省教育厅自然科学基金资助项目(QN2014067)；