Research On The Key Techniques For Rapid Construction Of Long Inclined Shaft In Thick Surface Soil

This paper uses key construction technologies for coal inclined shaft under the thick topsoil condition as research objects. The inclined shaft construction was divided into two sections which are topsoil segment and rock segment, and for each section, construction methods were selected respectively. Analyzing time used in roadheader operating line of rock segment, and adopting PDCA cycling method in construction management, both are relatively new concepts in the domestic mine construction. In order to ensure safety construction and timely support, peripheral convergence monitor was introduced in coal inclined shaft construction, and through construction verification, it could effectively forecast safety situation of the inclined shaft, which is advanced in the coal inclined shaft construction.The construction of coal mine inclined shaft at surface soil was divided into open channel section, junction section of open channel and dark cavern, as well as topsoil section; thus different excavation methods, support patterns, and construction assurance measures were selected for each construction segment in this research, according to various geological conditions. Moreover, setting the principle of construction and excavation, formulating the operation parameters, and combining the observation of the peripheral convergence, enabled the inclined shaft construction successfully passed through the surface soil section.The construction of coal mine inclined shaft at bedrock section adopted roadheader operating line, and took each construction cycle as per research time period. Firstly, braking down the construction processes of the roadheader operating line, and base on the Hengshan Weiqiang Coal Mine Project, calculated the weighted average from the collected data. Then, analyzing the critical chain of each construction process, as well as verifying the technical reason of influence on construction time used, improved techniques on time-consuming construction process, and well arranged the relationship among various construction procedures while organized parallel operation.Total quality management was applied on setting the organizational structure of project department, and responsibility matrix for key personnel was established. The construction operation was monitored by using the x-R control chart, to find the influence factors of construction time base on the data fluctuation range in the x-R control chart. For problems that rose during construction, PDCA cycle, an iterative four-step management method, was used to implement pre-feedback, pretreatment and cycle improvement, and a plan of "full participation, safe and efficient construction" was launched to enhance total involvement and initiative of inclined shaft rapid construction.Through the research on the technologies for long inclined shaft excavation under thick topsoil condition, this paper presents key influence factors of construction time used, and technologies used for shortening construction period. As inclined shaft construction is continuously optimized, applying a dynamic management philosophy PDCA to optimize the roadheader operation line into a dynamic process provides a practical method for future studies.