| 合肥盾构地表沉降和土压力变化模型试验 |
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| 引用本文： | 武文安,黄晓康,卢坤林,朱大勇.合肥盾构地表沉降和土压力变化模型试验[J].防灾减灾工程学报,2017(6):916-922. |
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| 作者姓名： | 武文安 黄晓康 卢坤林 朱大勇 |
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| 作者单位： | 合肥工业大学土木与水利工程学院， 安徽 合肥 230009 ；土木工程结构与材料安徽省重点试验室, 安徽 合肥 230009 |
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| 基金项目： | 国家自然科学基金项目（51179043,41402256）；合肥市轨道交通项目（2015FFCZ0617）资助 |
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| 摘 要： | 盾构开挖穿越不同性质的土体时,地表沉降规律和土压力变化规律均会发生改变。以合肥地铁盾构施工为背景,采用合肥地区典型砂土和黏工作为试验材料进行模型试验,探究盾构开挖情况下两种土质的地表沉降和土压力变化规律。结果表明:与黏土相比,砂土对开挖扰动更加敏感。开挖后砂土的沉降和土压力变化较快,土体在更短的时间内恢复稳定,同时砂土模型中相邻沉降测点测得的沉降值相差较大,最终的沉降槽起伏明显。而黏土的沉降和土压力变化较慢,最终的沉降槽较平缓。对两种土质还均有如下试验结果:开挖阶段的沉降值占总沉降值的比例基本相同,四个阶段中土压力减小速度和沉降速度呈现相似的规律,最大沉降值出现在先开挖侧而最大沉降速度出现在后开挖侧。
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| 关 键 词： | 盾构 模型试验 地表沉降 土压力 沉降槽 |
| 收稿时间： | 2016/5/30 0:00:00 |
| 修稿时间： | 2016/11/8 0:00:00 |
Model Test on Surface Settlement and Earth Pressure in HefeiCity Shield Tunneling |
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| WU Wenan,HUANG Xiaokang,LU Kunlin,ZHU Dayong.Model Test on Surface Settlement and Earth Pressure in HefeiCity Shield Tunneling[J].Journal of Disaster Prevent and Mitigation Eng,2017(6):916-922. |
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| Authors: | WU Wenan HUANG Xiaokang LU Kunlin ZHU Dayong |
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| Abstract: | The laws of surface settlement and earth pressure are different in different kinds ofsoil when shield machine passes through. With Hefei subway shield constructionas the background, model tests with typical sand and clay of Hefei region as test material are conducted to investigate variation laws of settlement and earth pressure change, which are caused by shield excavation. The results show that thesand ground is more sensitive than the clay ground to the disturbance of excavation. The change of settlement and earth pressure of sand model is much faster than that of the clay model after excavation, as well as the rate of recovery of stability. The curve of final settlement trough of sand model has more fluctuation than that of clay model. While the settlement and earth pressure of clay modelchange smoothly and the curve of final settlement trough of clay model is relatively smooth. For both kinds of soil model, results also show that ratios of settlement in excavation stage to final settlement are similar. The law of earth pressure decrease rate is basically identical with that of settlement rate duringfour experimental stages. The maximum value of settlement is observed at the formerly excavated side while the maximum value of settlement rate is at the latterlyexcavated side. |
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