Influence of deep excavation on adjacent subway
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摘要: 城市深基坑的施工中，往往会引起周围建（构）筑物的变形。对于临近运营地铁的基坑工程，由于其严格的变形控制要求，分析中对变形的合理预测是重点。本文通过研究小应变硬化本构模型的理论基础，根据北京地区的工程经验，针对这一高级本构模型，初步提出了适用于北京地区工程地质特点的主要参数取值方法。以北京地区某实际工程为例，本文采用小应变本构模型和莫尔库仑模型分别对其变形进行分析预测，并与实测结果对比表明，采用目前工程中最常用的莫尔库仑模型预测的结果与实际有很大的偏差，不适合用于变形控制设计的基坑分析，而小应变硬化模型较好的模拟了施工实际引起的变形，预测的隧道结构变形接近实测结果。Abstract: Urban excavations always result in deformations of surrounding buildings. In the analysis, reasonable prediction of deformations is of importance. After studies on the theory of hardening small strain (HSS) constitutive model, a series of experiential parameters are proposed. Adjacent to the operating subway, an excavation is put on by a strict deformation standard. The deformations of diaphragm wall and tunnel are predicted using the HSS model and the Mohr Coulomb model. A great difference is found between the Mohr Coulomb and observed results, while the HSS model reproduces the site deformation well. As a result, incorporating the HSS model into the deformation-control design is feasible.
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Keywords:
- deep excavation /
- deformation control /
- stiffness variation /
- constitutive model /
- small strain
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