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盾构隧道施工,隧道周边土体应力场发生改变,临近隧道土体因应力扰动出现塑性区,塑性区的分布范围与注浆压力、注浆量等注浆参数密切相关。塑性区被认为是施工扰动比较严重的区域,为分析盾构施工扰动范围,基于小孔扩张理论研究了注浆压力、注浆量对土体扰动塑性区的影响,推导了塑性区与注浆压力和注浆量之间的函数关系。在定义扰动评价标准基础上,提出应用有限元计算盾构施工塑性区和扰动范围的一种简捷实用的数值方法。最后采用静力触探现场测试盾构施工扰动范围,并与理论公式及有限元方法进行比较,理论公式、有限元及现场测试三者取得了较为一致的结果,验证了推荐方法的有效性。其研究结果可对盾构施工注浆参数的正确选择提供理论支持。
In the construction of shield tunnel, the soil stress field around the tunnel changes. The plastic zone near the tunnel soil due to the stress disturbance appears. The distribution of plastic zone is closely related to the grouting parameters such as grouting pressure and grouting volume. The plastic zone is considered as the area where the construction disturbance is relatively serious. In order to analyze the disturbance range of the shield construction, the influence of grouting pressure and grouting volume on the disturbance plastic zone is studied based on the theory of small hole expansion. The plastic zone and grouting Pressure and the amount of grouting as a function of. Based on the definition of disturbance evaluation criteria, a simple and practical numerical method for calculating the plastic zone of construction and the range of disturbance using the finite element method is proposed. In the end, the range of disturbance of shield construction was tested by static probe, and compared with the theoretical formula and finite element method. The theoretical formula, finite element and field test achieved more consistent results, which verified the validity of the recommended method. The research results can provide theoretical support for the correct selection of grouting parameters of shield construction.