Analysis Of Creep Deformation And Stability Of A Cavern In Bedded Salt Rock

Rock salt has the identity of low penetration coefficient and resilience damage by itself. So, using salt rock underground to store oil and gas is approbated by everyone. As the perfect concourse of storing oil and gas, the study to rock salt body becomes very important. Most rock salt body in our country are salt layer with interlayer and the impurities, they are mainly the gypsum,mudstone and so on. Distortion of our country's salt rock underground is more complexity compared with foreign salt rock. The convergence of the rock salt, as well as the difference between it and interlayer should be considered. The permeability of the salt rock, as well as the permeability of interlayer and layers must be considered. The stability of salt rock body as well as the heterogeneity of the interlayer should be considered. Characteristic for the salt rock and bedded salt rock have been summarized in the dissertation. Numerical simulation for the rock salt surrounding had been conducted. Stability and deformation in salt rock surrounding are analyzed. The main content and result are the follows:1. Experiment on rock salt is combined to summarize the identity of rock salt. According to the identity of our country's rock salt and the result of the study on layered rock salt in the past, the creep properties of rock sat and rock salt with mudstone interlayer are analyzed and summarized.2. The impact of the thickness of rock salt in top cavity to the intensity and displacement of rock salt cavern are analyzed according to the identity of rock salt. It is easily to result in the collapse of the cavern, and threat the stability of the rock salt cavern, if the top rock salt is too thin.3. The deformation of rock salt cavern with bedded. There is some difference in creep distortion between rock salt and interlayer, because they have different identity. Interlayer with less thickness has little effect to distortion, interlayer which is more thick has effect both in distortion and intensity of cavern. Because the thickness of interlayer is less than 10 meters in our country, so the existing of this kind interlayer has non effect in cavern's stability.