基于盐岩腔体收敛过程的地表变形动态预测

盐岩具有很强的流变特性,使得盐腔在运营过程中逐渐收缩,从而引起地面沉降,影响到地表建筑物的安全。为了获得盐岩开采引起地表变形的动态规律,基于传递函数方法,在考虑腔体收敛过程的情况下,对腔体收敛形式进行一定的简化,建立起一套适用于预测盐岩开采诱发地面变形的计算模型。本模型只引入腔体收敛率一个动态参数,求得地表变形情况,且与相同条件下椭圆体单腔开采引起的地表变形数值模拟结果具有很好的近似效果,说明本模型在一定程度上可运用于求解盐腔开采诱发地面变形。通过对群腔开采进行沉降计算,发现其布置形式和开采规模对地表沉降影响显著,该结果可为控制盐岩开采引发的沉降地质灾害提供借鉴。

Dynamic Prediction of Surface Deformation based on Convergence Process of Rock Salt Caverns

The salt rock has a strong rheological property, which makes the salt caverns shrink gradually during operation. It will cause surface subsidence and affect the safety of surface buildings. In order to obtain the dynamic regularity of surface deformation which caused by salt mining. Basing on the transfer function, establishing a prediction model about surface deformation induced by salt mining. That can be used for single salt rock carve and multiple carves. The model considers the caves convergence process and takes certain simplification of convergence. The proposed model only introduce cavity convergence rate as dynamic parameter, it can be used to calculate the surface deformation easily. At the same time, the results of surface deformation calculated by the proposed model and numerical simulation have a good approximate effect with the same elliptical salt cavern. It suggests that the proposed model can be applied to solve the surface deformation caused by the salt cavity mining. Through calculating the surface subsidence of salt group, it can be found that layout and mining scale have a significant effects on surface subsidence. The results can provide reference for controlling the geological disasters caused by salt mining.