Theory And Application Of Shaft Lining Design For Ultra Kilometer Deep And High Water Pressure In Jiaodong Gold Mine

Combined with the current resource development trend in China and the current status of metal mine shaft design theory and method,this study carried out the design research of the gold mine shaft with high water pressure and ultra kilometer deep in Jiaodong area,relying on the key research and development plan of "Deep Metal Mine Construction and Lifting Key Technology" in the 13th Five-Year Plan.The purpose of this study is to obtain the design theory and method of the shaft under the condition of high in-situ stress and high water pressure at the depth of the ultra kilometer deep shaft in Jiaodong area.The research has filled the blank of the design theory and method of ultra kilometer deep vertical shaft in domestic gold mine(metal mine).The research includes the following contents:1、The research on "Standard for test of mechanical properties of surrounding rock and concrete for ultra kilometer deep vertical shaft in gold mine" has been carried out.Based on the comparative test data analysis of uniform scale and test conditions,a unified material mechanical property evaluation method and criteria for the surrounding rock and concrete of the 1,000-meter vertical shaft in gold mine are established.In the existing mechanical test specifications of two kinds of materials(rock and concrete),the standard test sizes are not uniform.Considering the "size" effect of specimens,the parameter values obtained under the two test specifications can not be used at the same time.For the above reasons,the comparative tests of mechanical properties of the materials for the 1000 meter deep shaft support system in gold mine are carried out.The relationship between dynamic and static parameters of two kinds of support system materials with different sizes is studied.The unified standard specimen size for mechanical parameter experiment of 1000 m shaft supporting material in gold mine is put forward.2、Based on the modern fluid-structure coupling principle,the stress field,displacement field and seepage field of the surrounding rock under different grouting reinforcement parameters(permeability coefficient,elastic modulus and Poisson’s ratio after grouting)in the gold mine with high water pressure are studied.Based on Darcy and non-Darcy seepage principle,the differential equation under the condition of high water pressure and ultra kilometer deep shaft seepage in gold mine was established,and the analysis theory of stress field and seepage field in surrounding rock of ultra kilometer deep shaft with different grouting range and parameters was solved.It provides a theoretical basis for reasonably determining the grouting parameters of high water pressure and ultra kilometer deep vertical shaft in gold mine.The original rock stress field of the shaft was studied.Based on the unified classification standard of[BQ]surrounding rock in China,combined with the characteristics of the surrounding rock conditions of deep shaft,this paper puts forward a method to perfect the classification of surrounding rock for the design of of ultra kilometer deep shafts in gold mine.3、The anchoring mechanism of broken rock of ultra kilometer deep vertical shaft in gold mine is studied.This paper studies the theory and method of shaft anchoring and grouting design of high water pressure and ultra kilometer deep vertical shaft in gold mine,and further applies the design formula of Baoshen lining to the design theory of high water pressure and ultra kilometer deep vertical shaft in gold mine.Combined with the analytical theory and numerical simulation,the anchorage mechanics theory analysis of fractured surrounding rock in shaft is carried out.It is convenient for engineering design and construction to study and master the anchoring mechanism of vertical shaft surrounding rock,carry out corresponding model test,and put forward equivalent and concise theoretical analysis method.4、The stress field of the original rock in the shaft is studied,and the grouting reinforcement and anchoring structure are included in the design of the shaft wall of the gold mine.The complete design method of metal mine shaft is put forward.In this study,laboratory mechanical test,acoustic test,theoretical derivation,numerical calculation,model test as the research means.Through the research,the following conclusions and results are drawn:1、In this paper,based on the main shaft of Xincheng Gold Mine,uniaxial compressive strength test and comparative study of mechanical properties of surrounding rock and concrete in vertical shaft of gold mine,as well as indoor comparative test and study of mechanical properties of acoustic wave were carried out.The test method of acoustic mechanical properties of lining and surrounding rock suitable for vertical shaft of gold mine is summarized through experimental research.A set of conversion methods of mechanical parameters for nondestructive testing of laboratory specimens is formed.The ultrasonic parameters of the two materials were unified under the condition of the same size specimen.In the original design of the new ultra kilometer deep main shaft of Xincheng Gold Mine,the transverse and longitudinal wave velocities of C25 concrete used in the design are smaller than those of rock,and the mechanical properties of C25 concrete are worse than those of surrounding rock.In the metal mine shaft,the supporting ability of the concrete shaft lining of the complete section of surrounding rock is very weak.2、The formula of effective stress field and radius of grouting reinforcement based on fluid-solid coupling were deduced.The formulas of seepage field,stress field,displacement field and the design calculation formula of grouting reinforcement range are derived by the formulas considering non-Darcy seepage coefficient.At the same time,the analysis method of stress field and seepage field in vertical shaft with high water pressure in gold(metal mine)is obtained.The classification of engineering rock mass[BQ]is introduced into the design of metal mine shaft.3、Based on the equivalent principle of anchoring parameters,the orthogonal test method of similar model test for supporting parameters of vertical shaft in gold mine is put forward.The model test equipment for mechanical test of shaft bolt support is designed and manufactured.The results of similar simulation test are as follows:the reinforcement Angle of a single bolt is the most important factor,the diameter of the bolt is the second,and the preload of the bolt has the least effect.The determination of shear modulus G creates conditions for the use of Baoshen formula in shaft wall design of gold mine.The modified formula of"equivalent elastic modulus of anchorage structure with preload factor" is obtained.4、According to the situation of surrounding rock,two kinds of shaft design methods are put forward for the anhydrous section of broken surrounding rock(class Ⅳ)and the high hydraulic pressure section of broken surrounding rock(class V)of ultra kilometer deep vertical shaft of gold mine.Based on the new main shaft of Xincheng Gold Mine,the design of the shaft wall is carried out with deeply broken water-bearing surrounding rock.Draw the new main shaft of Xincheng Gold Mine with a ultra kilometer deep shaft structure design drawings.The design of new main shaft in Xincheng Gold Mine is checked and calculated.Finally,the design method of the high water pressure and ultra kilometer deep shaft structure of the gold mine in Jiaodong area is determined.