Coal mine vertical shaft freezing sinking process simulation calculation method

Abstract

The invention belongs to the technical field of coal mine freezing method vertical shaft sinking simulation, particularly relates to a coal mine vertical shaft freezing sinking process simulation calculation method. The method comprises the following two steps of 1, carrying out rock creep test, coring a frozen wall of a vertical shaft to be simulated, processing the frozen wall into a cylindricalrock sample with the diameter of 50mm and the height of 100mm, carrying out rock uniaxial creep tests at different temperatures to obtain a change rule of creep strain of the rock sample along with time in different temperature states, and calculating a rock creep constitutive equation at different temperatures according to the change rule; and 2, establishing a vertical shaft sinking model, embedding the creep constitutive equation obtained in the step 1 in finite element simulation software under different temperature states, setting temperature change and control time, and simulating the whole vertical shaft sinking process through the established model. According to the method, the stress deformation condition of the stratum confining pressure in each construction stage of freezing method sinking is simulated and calculated according to the actual influence of the creep deformation of the frozen wall, and the calculation result can guide the actual construction guidance.

Description

technical field [0001] The invention belongs to the technical field of shaft sinking simulation technology of coal mine freezing method, and in particular relates to a simulation calculation method for coal mine shaft freezing and sinking process. Background technique [0002] In coal mining in northwest China such as Shaanxi, Gansu, Inner Mongolia and other provinces and cities, most coal mine shaft shafts pass through deep water-rich soft rock formations such as the deep Cretaceous and Jurassic systems. Construction method. In deep soft rock frozen drilling, the frozen soft rock is in a complex state of high stress. After excavation and unloading, the rheological deformation of the frozen wall is an important part of its deformation. Numerical simulation is an important method to study the rheological deformation of the frozen wall . [0003] The current simulation method of shaft sinking construction by freezing method regards the frozen wall and the shaft wall as elast...

AI Technical Summary

Problems solved by technology

It is impossible to simulate the change of the wellbore during the period from the sinking of the well to the masonry of the outer shaft wall, nor can it reflect the interaction and deformation process between the frozen wall and the shaft wall. At the same time, it cannot simulate the inner shaft wall after the masonry. The changes in the wellbore during and after the thawing of the frozen wall lead to a certain difference between the final simulation results and the actual situation, which affects the later construction

Images