Calculation Method of Surrounding Rock Pressure of Variable Slope Surface Shallow Buried Bias and Small Clear Distance Tunnel
In order to study the influence of cohesion and internal friction angle on the pressure of the surrounding rock of the shallow buried bias and small clearance tunnel of variable slope surface,the limit equilibrium method is used to solve the problem of shallow buried bias and small clear distance tunnel depth,shallow buried side pressure coefficient,The vertical pressure of the surrounding rock vault and the horizontal pressure on both sides of the surrounding rock are deduced,and the calculation method of the surrounding rock pressure considering the cohesion and internal friction angle is derived,and the rationality of the formula is verified by a simple example compared with the existing standard formula and the existing literature,and the influencing factors of the horizontal lateral pressure coefficient of the deep buried tunnel are discussed.The results show that the horizontal lateral pressure coefficient increases gradually with the increase of slope angle,shows different trends with the increase of the included angle,decreases with the increase of cohesion and internal friction angle,and gradually increases with the increase of burial depth.Considering the action of cohesion and internal friction angle,the formula proposed in this paper is conducive to considering the adverse effects of the changes in the mechanical parameters of the rock and soil bodies caused by rainfall and other environmental factors on the surrounding rock,which can provide a theoretical basis for the structural design and optimization of supporting parameters of the shallow buried bias and small clearance tunnel with similar variable slope surface.
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