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| MECHANICAL PROPERTY WEAKENING AND THE MESO- MECHANISM OF HARD DISSOLVED SALT
ROCK SOAKED IN BRINE |
| YANG Xiaoqin1，2，LIANG Weiguo1，2，YU Yanmei1，2，ZHANG Chuanda1，2，YU Weidong1，2，ZHAO Yangsheng1，2 |
| (1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of In-situ Property-improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
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Abstract The internal meso-structure development of rock material contributes a lot to its macroscopic mechanical properties. The mechanical properties weakening mechanism and internal meso-structure development of typical glauberite soaked in brine are studied；and the mechanism of mechanical properties weakening is revealed. It is found that under the actions of swelling and disintegration of hydrophilic mineral in the cement of the rock，the dissolution of sulfate，the ion exchange and the chloride ion erosion damage，etc.，the porosity of glauberite soaked in brine is changed nonlinearly with the solution concentration and soaking time. So，the mechanical properties weakens. The strength weakening coefficient decreases to 0.1–0.2 after the glauberite being soaked in brine for 20 d. Because of the water effect and hydration，the argillaceous content contained in the glauberite would swell or disintegrate. So the deformation of glauberite shows the characteristics of strain softening and ductile from the original brittle behavior. The meso-structure development results also show that the pores in glauberite soaked in brine develop more slowly than that in pure water. The pores development rate in fresh water is several to hundreds of times as that in brine. The porosity of glauberite soaked in water for 48h increases to 16.62%，which is 9 times of that of natural state. And the porosity of glauberite soaked in half saturated solution for 48 h is 3 times of its natural state. However，the porosity of glauberite soaked in saturated solution for the same time has an increase of only 2.8%. The change of porosity is mainly due to dissolution and hydration of sulfate in the glaubetire，the water effect and cement of hydrophilic minerals(mainly glimmerton and smectite contents) swelling. These are definite reasons for the mechanical property weakening of the glauberite. The research results are significant either for study of physico-mechanical properties of the glauberite or for in situ leaching mining of salt deposits and salt cavern construction for oil and gas storage and other related engineering practice.
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Received: 27 May 2013
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2014, Vol. 33 
