| The Sandaoba coal fire area in Miquan,Xinjiang has a large area and rapid development.The annual damage to coal reaches hundreds of thousands of tons,and the threatened coal reaches nearly 20 million tons.At the same time,a huge amount of toxic and harmful gas has been formed due to the existence of the fire area.The spontaneous combustion environment has brought great damage.In order to improve the effectiveness of coal fire area management,the thesis carried out a research and application of comprehensive control of the coal fire area.The thesis is divided into three parts: the characteristics of the fire area of the Sandaoba coalfield in Miquan,Xinjiang,the detection of the high temperature area and the comprehensive treatment technology and process.Firstly,based on the existing data of Sandaoba coal fire area and the actual scene,the fire area was classified.And it was divided into the uncollapsed goaf fire area,the loose coal rock mass fire area and coal seam outcrop fire area.And the formation reason,spatial development law and fire characteristics of each fire area was analyzed.Then,combined with the actual situation of Sandaoba fire area,the integrated geophysical prospecting technology combining high-density electrical method,transient electromagnetic method,and magnetotelluric sounding was used to detect the fire area and delineate the high temperature area of the fire area.Finally,according to the characteristics of Sandaoba fire area as well as the detection results of the high temperature zone,the fire area management idea of " divide the control area,classify the type of fire area,and control the fire area targeted" was put forward.A comprehensive fire area control technology with water injection,two-phase foam injection,foaming cement injection,and yellow mud injection as the mainstay,and flat stripping,excavation,and loess covering as supplements had been formed.We have formulated the corresponding fire area management plan.The specific control plan is as follow: water injection,two-phase foam technology,aggregate partition filling technology,and yellow mud colloid filling technology are mainly used in the fire area of the uncollapsed goaf.The loose coal rock fire area mainly uses water injection technology and two-phase foam technology,foamed cement technology.The main use of water injection,yellow mud colloid injection and excavation combined technical means for outcrop fire areas of coal seams.Through the implementation of the above comprehensive fire zone control technology,the Sandaoba coal fire area in Miquan,Xinjiang has been effectively controlled.The thesis contains 43 figures,13 tables and 64 references. |
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