盐穴储气库三种典型岩石拉伸声发射特征研究.

Salt rock, mudstone, and glauberite are three typical rocks of the salt cavern gas storage. In order to obtain the rocks’ characteristic parameters of acoustic emission under the stretching test, the Brazilian split test and acoustic emission test were carried out. The results show that among the three rocks, salt rock’s strength is the lowest, with peak stress of 1.27 MPa, which is less than 1/2 of mudstone and slightly lower than glauberite. The maximum strain salt rock corresponding to the peak stress is 0.007 6, which is 1.5 times larger than mudstone and more than 2 times that of glauberite. Among the three rocks, the maximum number of acoustic emission events for salt rock is 10 148, mudstone is 119, and glauberite is 1 166. The salt rock first appears the acoustic emission event point at the cushion, while the mudstone and glauberite appears in the middle part of the sample and extended towards both ends along the loading direction. The energy rate and the ringing count rate of three rocks increases significantly during the yield deformation stage. The cumulative energy and cumulative ringing count of the salt rock rose in the form of a smooth curve, which the curve of the mudstone is stepped, and the glauberite is steep near the peak stress. The maximum average energy and ringing count of salt rock is 2.02×10-14 J and 1 200.6 times. Mudstone is similar to glauberite, of which difference between salt rock is large. [ABSTRACT FROM AUTHOR]