In this paper,the horizontal slice method is introduced into the calculation of small clear distance tunnel,and the cohesion of rock and soil and the angle of internal friction are considered as independent factors.Through the derivation of the formula,the position of the intersection point of the inner fracture surface of the tunnel can be accurately obtained,and then the analytical solution of the surrounding rock pressure of the shallow buried small clear distance tunnel under static conditions can be derived.The results are compared with the calculated values according to specifications and engineering measured values to verify the accuracy of the formula derived in this paper.The results show that compared with the standard method,this research method is more reasonable in theory,more in line with the engineering practice,and can calculate the surrounding rock pressure of tunnel more accurately.When the clear distance of the tunnel is between 1.0 and 1.5 times the excavation span of a single bore,the formula for calculating the surrounding rock pressure in tunnels with a small clear distance,as presented in this paper,proves to be more precise and widely applicable.The surrounding rock pressure distribution of the leading tunnel and the trailing tunnel with small clear distance has certain regularity.The vertical surrounding rock pressure inside the trailing tunnel is greater than that of the leading tunnel,and the horizontal side pressure is less than that of the leading tunnel.At the same time,the vertical surrounding rock pressure inside a single tunnel is greater than that outside,and the horizontal pressure outside is greater than that inside.
关键词
隧道工程/小净距隧道/围岩压力/条分法/浅埋
Key words
tunnel engineering/small-spacing tunnels/surrounding rock pressure/slice method/shallow cover
维普
万方数据