复合地层土压平衡盾构掘进参数模拟分析研究:《隧道建设》2012年03期

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b7PQI7q?7V[0【摘要】:复合地层特别是软硬交互地层的盾构掘进参数模拟与预测理论及方法研究,目前还处于薄弱阶段。基于Terzaghi松动土压力模型与CSM(科罗拉多矿业学院)模型,对广州地铁3号线大石—汉溪区间不同风化程度混合岩地层的土压平衡盾构掘进表现分别进行模拟分析,结果基本符合实际的掘进表现,但在贯入度大于20 mm/r的硬岩掘进情况下推力及扭矩模拟值与实际值存在较大正负差异。针对这种正负差异情况,分析可能产生的原因。通过对软硬交互复合地层的盾构受力分析,模拟计算在软硬地层各占50%情况下的推力与扭矩值,结果表明,总推力和扭矩的模拟值均在实际值范围内,验证了采用的综合考虑软土和硬岩模拟分析结果的复合地层掘进参数模拟分析方法的有效性。

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常州数尔精密机械有限公司;广州市盾建地下工程有限公司;中铁十一局集团城市轨道工程有限公司;水利论文o.tV D9m"P

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【关键词】:

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软弱地层 硬岩地层 软硬交互地层 复合地层 土压平衡模式 敞开模式 半敞开模式 模拟分析

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0引言随着40台次盾构在广州和深圳地区复合地层100 km的实践,复合地层的概念逐步形成,复合地层盾构施工技术有了突破性的进展[1-2]。文献[3]针对广州地铁软硬不均地层的盾构施工,提出了复合盾构的设计思想,对复合盾构的功能及技术参数进行了研究,分析了刀盘、刀具与地质的适

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