MECHANISMS OF HUMIDITY INDUCED DEFORMATION OF ROCK SALT
In rock engineering, e.g. tunnelling, mining or underground disposal, deformation and stress have to be monitored to evaluate stability of cavities and hydraulic integrity of the rock mass. For the interpretation of such results and as a basis for the prognosis, laboratory investigations must be performed under defined loading by stress, temperature and humidity, to determine the material behaviour of the rock. Within this study a long-term laboratory test was performed to investigate the mechanisms of deformation of rock salt samples in connection with changes of humidity. In salt mines such humidity changes occur for instance as a result of ventilation or of backfilling of rooms using salt concrete. As known from former creep tests, the deformability of rock salt strongly increases at higher levels of humidity but it was not known by which mechanisms this is controlled. In the specially designed laboratory test acoustic emission and active ultrasonic measurements were used to characterize the damage evolution. The results document that increased humidity in the sample leads to an increase of ductility as well as to an increase of damage and cohesion loss.
THOMAS SPIES JUERGEN HESSER
Federal Institute for Geosciences and Natural Resources (BGR), Hanover, Germany
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
491-498
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）