Research On Rock Drilling Wharf And Reinforcement Scheme For Fractured Rock Masses Of The Wharf

Rock drilling wharf is a new type of wharf structure which is supported by reinforced concrete panels,sheet piles and other components on the surface of rock mass through rock mass excavation,removal and reinforcement.Different from caisson gravity wharf and high-pile wharf,the large rock drilling wharf is seldom used in wharf engineering in our country because of the lack of design theory and technical constraints.The reinforcement of cracks in rock mass is the premise of structural stability,so it is necessary to study the reinforcement scheme of cracks.Based on the Lianjiang Wharf Project in Fujian Province,this paper calculates and analyzes the stability and crack reinforcement components of the rock drilling wharf by using the limit equilibrium theory and the finite element method,and obtains the design idea and calculation method of the rock drilling wharf and the corresponding support and reinforcement scheme.Aiming at the slip and overturning failure of rock mass along cracks in rock drilling wharf,three support and reinforcement schemes of sheet pile,anchor and antislide pile are studied.First of all,according to the limit equilibrium theory,the design and calculation methods of each reinforcement scheme are put forward through force balance and moment balance.Then,the finite element method is used to establish the simulation model of rock drilling wharf and crack reinforcement components,and each scheme is optimized.Finally,the finite element calculation results are compared with those of limit equilibrium theory to verify the effectiveness and safety of each scheme,and the calculation ideas and basic laws suitable for rock drilling wharf are optimized and summarized.Through the calculation and analysis of the reinforcement scheme of sheet pile,anchor and anti-slide pile of rock drilling wharf,the conclusions are as follows:(1)The reinforcement and support scheme of rock drilling wharf is selected according to the degree of rock fragmentation.For the rock mass with large degree of rock fragmentation and many cracks,sheet pile is selected as the support and wharf structure;for the rock mass with less rock fragmentation and less cracks,oblique anchors are used to reinforce the cracks;for the rock mass with more cracks,the pile foundation is used to reinforce the cracks.(2)Aiming at the dangerous face of the through crack in the rock mass of the drilling wharf,the distributed anchors are arranged along the crack direction,and the anchor members are used to provide shear and tensile force to maintain the stability of the rock mass.The limit equilibrium theory and numerical simulation are used to determine the bolt layout and parameters.(3)Aiming at the through crack surface of the rock drilling wharf,a vertical castin-place pile is arranged on the wharf surface,and the cast-in-place pile is used to provide anti-slide force to maintain the stability of the rock mass.Limit equilibrium theory and numerical simulation are used to determine the layout and parameters of cast-in-place pile.According to the geological conditions of Lianjiang Wharf Project in Fujian Province,by comparing and analyzing the advantages and application of various reinforcement and support schemes,the rock drilling wharf can be constructed by digging rock mass and using cast-in-place rock socketed pile to reinforce rock fissures and wharf rock mass.