基于長沙地鐵開挖引起的地面沉降預(yù)測分析
[Abstract]:With the rapid development of China's economy, subway excavation project has entered the stage of large-scale construction. However, there are more and more disasters caused by subway excavation, and people pay more and more attention to the ground subsidence caused by excavation. The underground excavation will disturb the surrounding soil, and the release of some soil stress will break the stress balance of the original soil, and the stress adjustment and deformation caused by the construction disturbance will be transmitted to the ground. It causes the change of the properties of the soil and its supporting conditions, which results in uneven settlement and various deformation of the ground, which will affect its normal use and even cause collapse or uplift failure. In recent years, similar accidents have occurred frequently in many subway excavation construction at home and abroad, resulting in significant economic losses and serious social consequences. The ground deformation caused by urban tunnel construction will inevitably have a negative impact on the environment, so settlement control is very important in the design and construction of tunnel quality management. Based on the excavation project of Wangmei section station of West extension Line of Changsha Metro Line 2, this paper firstly studies the lateral surface settlement caused by subway excavation. The Gao Si equation proposed by Peck is the simplest and most widely used method to predict the lateral surface settlement caused by subway tunnel excavation. Peck holds that the ground subsidence caused by construction occurs without drainage. So the settlement tank volume should be equal to the formation loss volume. It assumes that the formation loss is uniformly distributed in the whole tunnel length, and the transverse distribution of surface subsidence generated by tunnel construction is approximately a normal distribution curve. Since the formula is based on the measured data in a limited area, the verification work based on the local measured data should be carried out before application, and the geological conditions of each region are different. The settlement predicted by the Peck formula often does not coincide with the measured data, and there is a large error. Based on the field monitoring data, this paper introduces two correction coefficients by regression analysis, that is, the correction coefficient 偽 of the maximum surface subsidence and the correction coefficient 尾 of the width of the subsidence trough. The Peck formula is modified in this paper. The Peck formula applicable to the west extension of Changsha Metro Line 2 is obtained, and the reference basis for the construction of other subway lines in the future is provided. At the same time, on the basis of collecting and arranging all kinds of mathematical models commonly used in engineering to predict long-term settlement, the curve fitting is carried out according to 50 groups of settlement data from December 20, 2012 to July 15, 2013. Each parameter value in the prediction of six models is calculated and analyzed, and the variation law of ground subsidence caused by subway construction with time is discussed, and the measured and predicted values are compared, and the errors in each stage are compared. Finally, the hyperbolic model is chosen as the most suitable model for predicting the long-term settlement of the land surface. The research results have certain theoretical significance and broad application prospect.
【學(xué)位授予單位】:中南林業(yè)科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U231.3;P642.26
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