本文關(guān)鍵詞： 坑底隆起 監(jiān)測方法 壓差傳感技術(shù)　出處：《水文地質(zhì)工程地質(zhì)》2017年06期 　論文類型：期刊論文

【摘要】：針對(duì)基坑坑底隆起監(jiān)測問題,提出了一種基于壓差傳感技術(shù)的坑底隆起監(jiān)測方法。首先分析了壓差傳感技術(shù)原理,其次介紹了監(jiān)測系統(tǒng)中的壓差傳感系統(tǒng)及相應(yīng)的輔助系統(tǒng),然后通過模型試驗(yàn)驗(yàn)證了監(jiān)測系統(tǒng)的溫度穩(wěn)定性,最后將該監(jiān)測系統(tǒng)應(yīng)用于工程實(shí)踐,并對(duì)監(jiān)測結(jié)果進(jìn)行了分析。所得主要結(jié)論如下:基于壓差傳感技術(shù)的坑底隆起監(jiān)測系統(tǒng)通過測點(diǎn)處的液面變化來反映豎向位移�；涌拥茁∑鹬惦S著開挖深度的增加而增大;開挖深度較小時(shí),坑底隆起隨基坑開挖同時(shí)發(fā)生和結(jié)束;當(dāng)基坑開挖深度不斷增加,坑底隆起隨基坑開挖同時(shí)發(fā)生,并在該層開挖結(jié)束后持續(xù)增大。開挖相同厚度的土層,深度越深,所引起的坑底隆起越大,坑底土體重新穩(wěn)定所需要的時(shí)間也越長。
[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.
【作者單位】： 寧波市軌道交通集團(tuán)有限公司;
【分類號(hào)】：TU753
【正文快照】： 基坑開挖過程中坑底土體卸載回彈以及坑底土體負(fù)孔隙水壓力消散導(dǎo)致的吸水膨脹與軟化都將導(dǎo)致坑底隆起[1]。坑底隆起一方面會(huì)引起基坑工程本身的質(zhì)量安全問題,如坑底受承壓水作用產(chǎn)生隆起破壞;另一方面會(huì)對(duì)附近建(構(gòu))筑物產(chǎn)生不利影響,如地鐵隧道上方基坑開挖產(chǎn)生坑底隆起引起

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本文編號(hào)：1475465