Research On Progress Control Of Large Diameter Vertical Shaft Project Based On Critical Chain Technology

As a major coal producer and consumer in the world,coal production plays a vital role in China’s economic development.In recent years,with the exhaustion of shallow coal resources,the depth of shaft began to exceed 1,000 meters.The depth of the tunneling can reach 800-1200m,and the diameter of the shaft is 9.0-15.0m.This caused the construction speed of the shaft to drop sharply,the construction period increased,and the construction technical and economic indicators were too high.In response to the above problems,the state has carried out research projects on technical equipment including "key technology and equipment research for rapid excavation of deep-scale bedrocks in kilometer-scale",but few studies have focused on the construction of construction projects for vertical shaft construction projects.As an important part of mine construction,the vertical shaft project is directly related to the economic benefits of the mine.The current vertical shaft project mostly uses the critical path method to manage the construction period.Any delay in the construction of the critical route will result in delays or even failures in the entire project.Due to the complicated construction process of the vertical shaft project,the intersection of many processes,and the large changes in the strata environment,there are many disturbance factors in the construction progress,so the project construction period is difficult to guarantee.In this paper,the PERT method was used to determine the 18 expected construction periods of large-diameter shaft constructions.The network plan was drawn through WBS,and the critical path was determined.The expected construction period is 641 days.Taking the concrete consumption as the core constraint resource,all the process resource requirements of the well construction were statistically obtained,and the key process resource conflicts were solved according to the principle of minimum construction time.On this basis,the critical path was optimized.The buffer FB was set up in the non-critical chain and the key link barge.The root canal calculation method was used to calculate the buffer size of the vertical shaft construction,and the optimization model of the vertical well construction project schedule management based on the critical chain technology was formed,which was achieved without affecting the completion.The purpose of shortening the planned construction period on the premise of the rate.Finally,the buffer three-color management matrix model was used to establish a vertical well construction process management monitoring plan,and comprehensive protection measures for ideas,organization,technology,system and economy were formulated to ensure the smooth implementation of construction projects and provide reference for the vertical shaft construction projects of other enterprises.Figure[16]Table[10]Reference[57]...