流固耦合下深层盾构隧道开挖面稳定流体参数研究

发布时间：2019-05-13 22:29

【摘要】：目前盾构工法广泛应用于城市地铁的建设之中,而隧道开挖面稳定性是影响隧道施工安全性的重要因素。采用数值模拟的方法,对考虑流固耦合影响的深层盾构隧道砂土层开挖面稳定性进行了模拟研究,并利用自己提出的一套新的判别准则来确定盾构隧道开挖面极限支护压力。相比以前的研究,该准则不仅考虑了盾构隧道开挖面直径对确定极限支护压力的影响,而且也考虑了在开挖面位移曲线突变和近线性两种类型下的极限支护压力如何确定。利用该判别准则,对影响渗流状态下砂土层隧道开挖面稳定性的因素——土体饱和渗透系数、渗流持续时间、地下水位埋深和孔隙率等进行了参数敏感性分析。研究结果表明,土体饱和渗透系数、渗流持续时间、地下水位埋深均与开挖面极限支护压力成正比关系;而随孔隙率变化,开挖面极限支护压力则变化不大。
[Abstract]:At present, shield tunneling method is widely used in the construction of urban subway, and the stability of tunnel excavation surface is an important factor affecting the safety of tunnel construction. The stability of sand layer excavation surface of deep shield tunnel considering the effect of fluid-solid coupling is simulated by numerical simulation method, and a new set of criteria proposed by ourselves is used to determine the ultimate support pressure of shield tunnel excavation surface. Compared with the previous research, this criterion not only considers the influence of the diameter of shield tunnel excavation surface on the determination of ultimate support pressure, but also considers how to determine the ultimate support pressure under the sudden change of displacement curve and the near linear type of excavation surface displacement curve. By using this criterion, the parameter sensitivity analysis of the factors affecting the stability of sand layer tunnel excavation surface, such as soil saturated permeability coefficient, seepage duration, groundwater level buried depth and porosity, is carried out. The results show that the saturated permeability coefficient, seepage duration and groundwater level buried depth are proportional to the ultimate support pressure of the excavated surface, but the ultimate support pressure of the excavated surface does not change much with the change of porosity.
【作者单位】：常州市轨道交通发展有限公司;同济大学土木工程学院;
【基金】：国家自然科学重大研究计划项目,项目编号90815008 国家人防项目,项目编号0290235002
【分类号】：U455.43

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