基于压差传感技术的坑底隆起监测方法及应用

发布时间：2018-01-30 05:52

本文关键词： 坑底隆起监测方法压差传感技术　出处：《水文地质工程地质》2017年06期 　论文类型：期刊论文

【摘要】：针对基坑坑底隆起监测问题,提出了一种基于压差传感技术的坑底隆起监测方法。首先分析了压差传感技术原理,其次介绍了监测系统中的压差传感系统及相应的辅助系统,然后通过模型试验验证了监测系统的温度稳定性,最后将该监测系统应用于工程实践,并对监测结果进行了分析。所得主要结论如下:基于压差传感技术的坑底隆起监测系统通过测点处的液面变化来反映竖向位移。基坑坑底隆起值随着开挖深度的增加而增大;开挖深度较小时,坑底隆起随基坑开挖同时发生和结束;当基坑开挖深度不断增加,坑底隆起随基坑开挖同时发生,并在该层开挖结束后持续增大。开挖相同厚度的土层,深度越深,所引起的坑底隆起越大,坑底土体重新稳定所需要的时间也越长。
[Abstract]:To solve the problem of pit bottom uplift monitoring, a new method based on differential pressure sensing technology is proposed. Firstly, the principle of pressure differential sensing technology is analyzed. Secondly, the differential pressure sensing system and the corresponding auxiliary system are introduced, and the temperature stability of the monitoring system is verified by model test. Finally, the monitoring system is applied in engineering practice. The main conclusions are as follows:. The bottom uplift monitoring system based on the differential pressure sensing technology reflects the vertical displacement through the change of the liquid level at the measuring point. The value of the bottom uplift of the foundation pit increases with the increase of the excavation depth. When the excavation depth is small, the bottom uplift occurs and ends simultaneously with the excavation of the foundation pit. When the excavation depth is increasing, the bottom uplift occurs simultaneously with the excavation of the foundation pit, and increases continuously after the excavation of the layer. The deeper the depth is, the bigger the bottom uplift is. The longer it takes for the bottom soil to be stabilized.
【作者单位】：宁波市轨道交通集团有限公司;
【分类号】：TU753
【正文快照】： 基坑开挖过程中坑底土体卸载回弹以及坑底土体负孔隙水压力消散导致的吸水膨胀与软化都将导致坑底隆起[1]。坑底隆起一方面会引起基坑工程本身的质量安全问题,如坑底受承压水作用产生隆起破坏;另一方面会对附近建(构)筑物产生不利影响,如地铁隧道上方基坑开挖产生坑底隆起引起

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