Forward Inversion Analysis On Physical Parameters Of Surrounding Rock

As 21st century China's rapid economic development, infrastructure constructions get unprecedented opportunities for development. Traffic engineering as the main component of infrastructure, its development is also changing, as one of the focal points of transportation engineering, the construction of the tunnel got rapid development. This requires tunnel in design, construction and operation process guarantee its safety, economy and durability. At present, the design and construction of the tunnel are established on the basis of experience, design and construction is conservative and reason for surrounding rock and the uncertainty of the physical parameters of surrounding rock, unable to give full play to the stability and supporting material strength. How to give full play to the surrounding rock and materials, achieve tunnel construction self-intensity of security, economic demand is our problems needed to resolve.Due to the complexity of surrounding rock, and geological survey, therefore, existing in design unilateralism when design safety factor relies on increase and the supporting structure strength (such as section size, material strength). Lead to excessive waste material. Therefore, develop the physical parameters of surrounding rock back analysis study is very necessary.In this paper the physical parameters of surrounding rock back analysis method was studied. The research content mainly divided into the following several aspects:①To discuss the principle of surrounding rock inversion analysis, this paper proposes some species and actual engineering inversion analysis method.②By comparing different statistics method of field monitoring data of statistical analysis, get reasonable data set.③According to the concrete construction principle and construction procedure, the finite element theory and calculation software to simulate the whole construction and guide the construction.④According to the actual monitoring data, we can build plane and three-dimensional calculation model is derived, compiling inversion iteration formulas of the surrounding rock of physical parameters.⑤Using inversion get physical parameters, calculation of the tunnel and displacement stress and strain. Through comparing with actual monitoring data, test physical parameters of rationality.Based on the actual rock tunnel engineering, the results showed that the plane inversion analysis through inversion of the surrounding rock: get physical parameters and practical parameters of surrounding rock is identical, to improve during the tunnel construction of tunnel monitoring measurement accuracy of forecasting work and advance.Based on the actual rock tunnel engineering 3d inversion analysis, and the results show that: establishing three-dimensional model inversion of physical parameters obtained than plane model parameters more accurate, and the actual monitoring data more data.Through the analysis and calculation of practical engineering, we can draw the: use the displacement method combining optimization disposal inversion, and the form of physical parameters of surrounding rock back analysis, it is a kind of simple and quick way.