Title: STUDY ON MOVEMENT AND STRESS EVOLUTIONARY PROCESS OF IMPACTED ROOF WITH 3DEC
Abstract:The model of long wall top-coal caving is established with three-dimensional discrete element method(3DEC) to study the impact movements of stope,mined-out area and roof strata and the segmentation fa...The model of long wall top-coal caving is established with three-dimensional discrete element method(3DEC) to study the impact movements of stope,mined-out area and roof strata and the segmentation falling are formed in actual mining at comprehensive mining face.The vertical stress and horizontal stress evolutionary process of mining rockmass are recorded and analyzed during the course of the stope moving.The research results indicate that the movement forms,roof pressurization period and strength of main roof have relationship with the drop thickness of immediate roof in mined-out area;the pressure arch formed by immediate roof behind hydraulic power support can buffer the roof pressurization strength of main roof,and at the same time,the roof pressurization period is modified.The block vertical stress and horizontal stress present high and low area divisions,i.e.the stress concentration exists in tracking rock block and the stress concentration degree continually fluctuates with the working face closing up to the tracking rock block.With the height of rock stratum increasing,the peak stress moves to the front of coal face.Read More
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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Cited By Count: 2
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