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首页> 外文期刊>Tunnelling and underground space technology >Ground movements in EPB shield tunneling of Bangkok subway project and impacts on adjacent buildings
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Ground movements in EPB shield tunneling of Bangkok subway project and impacts on adjacent buildings

机译：曼谷地铁项目EPB盾构隧道的地面运动及其对相邻建筑物的影响

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摘要

Monitoring data of the first Bangkok subway project excavated by 8 EPB shields were analyzed to evaluate the ground movement characteristics and responses of adjacent buildings. Mostly the maximum ground surface settlements were in the range of 20-40 mm, corresponding to 0.5-2.0% of tunnel volume loss, although few sections experienced larger settlements reaching 100 mm. Larger ground losses tended to occur while excavating in sand or mixed soil layers and at locations of long duration stoppage. There was only a slight trend of relationship between the settlement and shield pressure. The predominant factor controlling the movement was the human related factor in shield operating which was not easy to predict. Obstructions from piled foundations and other known and unknown buried utilities and objects, resulted in non-conformance of ground surface settlement troughs to the Gaussian function, thus they could not be predicted by any empirical and analytical methods. Shield face pressures often caused outward ground displacements that complicated the final ground movements, particularly the lateral displacement which could not be predicted by available analytical methods. Long term consolidation settlements mainly occurred in the soft clay layer, but the amount and rate did not seem significant. On impacts to buildings, buildings on deep piles showed the least induced settlements. But for buildings on short piles, the settlements may be larger or smaller than ground surface settlements, depending on the distance from tunnel center line and pile tip depth.
机译：分析了由8个EPB盾构开挖的曼谷第一个地铁项目的监测数据，以评估地面运动特征和邻近建筑物的响应。大多数地面最大沉降量在20-40 mm的范围内，相当于隧道体积损失的0.5-2.0％，尽管很少有人遇到较大的沉降量达到100 mm。在沙土或混合土壤层中以及长时间停工的位置开挖时，往往会发生更大的地面损失。沉降和盾构压力之间只有很小的关系。控制运动的主要因素是盾牌操作中与人相关的因素，这不容易预测。桩基以及其他已知和未知的地下公用设施和物体的障碍物导致地表沉降波谷不符合高斯函数，因此无法通过任何经验和分析方法进行预测。盾构工作面压力经常引起向外的地面位移，使最终的地面运动复杂化，尤其是横向位移，而现有的分析方法无法预测这些位移。长期固结沉降主要发生在软粘土层中，但数量和速率似乎并不重要。在对建筑物的影响上，深桩建筑物的诱导沉降最少。但是对于短桩建筑物，沉降量可能大于或小于地面沉降量，具体取决于距隧道中心线的距离和桩尖深度。

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