盾构开挖面楔形体支护压力模型分析及改进

发布时间：2019-02-22 20:08

【摘要】：为了维持砂土地层盾构隧道开挖面的稳定性,以楔形体模型2种常用的面积等效方法为出发点,对开挖面支护压力计算公式进行推导,同时结合现有楔形体模型与Takano 1g模型试验结果从砂土盾构开挖面破坏区外形的角度改进楔形体计算模型,在考虑松动土压力的情况下提出盾构开挖面主动极限支护压力的计算公式并简化。将Chambon离心模型试验结果与楔形体支护压力计算结果进行对比,并依托西安盾构隧道工程土舱压力监测数据对新公式进行工程应用分析。研究结果表明:采用第1种面积等效方法时的楔形体模型计算结果更为精确,不同模型计算结果出现差异的主要原因来自于楔形体竖直侧面摩擦力的影响,同时提出1.5倍所提简化公式的计算值作为上部土舱压力设定的建议值。
[Abstract]:In order to maintain the stability of excavation surface of shield tunnel in sand stratum, the calculation formula of supporting pressure of excavating face is deduced based on two common area equivalent methods of wedge body model. At the same time, according to the experimental results of the existing wedge model and Takano 1g model, the wedge calculation model is improved from the angle of the shape of the damaged area of sand shield excavating surface. Under the condition of considering the loose earth pressure, the formula for calculating the active limit support pressure of shield excavating face is presented and simplified. The results of Chambon centrifugal model test are compared with the calculated results of wedge support pressure, and the new formula is analyzed based on the soil chamber pressure monitoring data of Xi'an shield tunnel project. The results show that the calculated results of the wedge model with the first area equivalent method are more accurate, and the main reason for the difference in the results of the different models is the influence of the friction force on the vertical side of the wedge body. At the same time, the calculated value of 1.5 times simplified formula is put forward as the suggested value of upper earth tank pressure setting.
【作者单位】：东北大学资源与土木工程学院;
【基金】：国家自然科学基金项目(51578116)
【分类号】：U455.43

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