| 位移正反分析在地铁施工变位分配控制中的应用 |
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| 引用本文： | 房 倩,张顶立.位移正反分析在地铁施工变位分配控制中的应用[J].岩土力学,2006,27(Z1):406-411. |
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| 作者姓名： | 房 倩 张顶立 |
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| 作者单位： | 北京交通大学 隧道及地下工程试验研究中心，北京 100044 |
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| 摘 要： | 采用浅埋暗挖法施工的城市地铁车站，开挖将不可避免地扰动土层引起地表沉降，从而对周围建构筑物的安全造成危害。由于地铁车站洞室的断面较大，大多采用分步开挖的方式施工，采用变位分配的方法通过预测每一步施工造成的地表沉降将最终的地表沉降分解到各个施工步序中，从而建立起各个阶段的地表沉降控制标准。这样，就可以通过加强对各个阶段的地表沉降的控制来实现对地表沉降进行整体控制的目的。而通过地质勘测所得的参数往往不能满足变位分配所依赖的数值模拟的要求，因此，反分析作为一种有效地补充手段来获得适合岩土工程数值模拟的力学参数。详细介绍了位移正反分析的特点、模型的建立条件和分析步骤，并通过工程实例验证了位移正反分析在预测地表沉降，从而提出变位分配控制标准的可行性。
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| 关 键 词： | 反分析 变位分配控制 数值模拟 最优化参数 地铁车站 |
| 收稿时间： | 2006-07-11 |
Direct back analysis algorithm for deflection distribution
control during construction of subway |
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| FANG Qian,ZHANG Dingi.Direct back analysis algorithm for deflection distribution
control during construction of subway[J].Rock and Soil Mechanics,2006,27(Z1):406-411. |
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| Authors: | FANG Qian ZHANG Dingi |
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| Institution: | Research Center of Tunneling and Underground Engineering, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | The ground surface settlements induced by the construction of subways using shallow tunnel construction method are hardly avoidable. As the cross-sections of subways are very large most of them adopt partial-face excavation method. So it is possible to use deflection distribution control method to distribute the final ground surface settlements into every construction stage and make the ground surface settlement control standard for each construction stage．In this way we can achieve the aim of integral control by controlling in every stages. But it is often not acceptable to use the parameters from geological exploration in numerical simulation which is relied by deflection distribution control. So back analysis is used as a complement method in getting the parameters adapt to numerical simulation. This paper describes the characteristics of direct back analysis, the qualification for modeling and the procedures for analysis. Application of a real subway showed that the proposed system could successfully forecast the ground surface settlement and approve the practicability of the deflection distribution control method. |
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| Keywords: | back analysis deflection distribution control numerical simulation optimized parameter subway station |
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