RESEARCH ON THE SOIL DISPLACEMENT LAW CAUSED BY DOUBLE LINE TUNNEL IN UPPER SOFT AND LOWER HARD STRATA
In order to study the displacement law of surface and deep soil caused by the crossing of double line par-allel tunnels through upper soft and lower hard strata, based on the excavation characteristics of composite strata, a calculation formula for the vertical displacement of soil caused by double line tunnel construction was derived based on Mindlin solution and random medium theory. Reliability verification is conducted based on engineering measured data. The results indicate that the calculated results are similar to the variation patterns of the measured data. Soil loss is the main factor causing formation settlement. As the depth of the soil increases, the width of the settlement groove decreases and the central settlement value increases. The settlement curves under single and double track conditions are V-shaped and W-shaped, respectively. As the excavation spacing decreases, the overall settlement of the soil will increase. The research may provide the reference for predicting the vertical displacement of soil caused by the excavation of a double-line tunnel in a complex stratum.s
upper soft and lower hard stratadouble track parallel tunnelprediction of soil displacementimpact of shield excavation
万方数据
维普
