| 西安典型段地面沉降分层标观测及数值模拟 |
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| 引用本文： | 王启耀,彭建兵,蒋臻蔚,滕宏泉.西安典型段地面沉降分层标观测及数值模拟[J].岩土力学,2014,35(11):3298-3302. |
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| 作者姓名： | 王启耀 彭建兵 蒋臻蔚 滕宏泉 |
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| 作者单位： | 1.长安大学 建筑工程学院，西安 710061；2.长安大学 地质工程与测绘学院，西安 710054
3.长安大学 西部矿产资源与地质工程教育部重点实验室，西安 710054；4.陕西省地质环境监测总站，西安 710054 |
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| 基金项目： | 国家自然科学基金重点项目(No. 41130753)；国家自然科学基金(No. 41202188）；国家留学基金委项目(No. 201208610103）。 |
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| 摘 要： | 根据西安地下水监测和详细的地层剖面资料,采用比奥固结理论和不连续面的接触分析,建立了含2条地裂缝的典型地段的二维抽水沉降计算模型,对先存断裂存在时抽水作用下的地面沉降进行了尽可能精细地模拟计算。结合该计算段的监测资料,分析了西安市抽水作用下地层压缩量垂向上的分布特点及地面沉降水平位置上存在差异的原因。研究认为,西安市的地面沉降量主要由100300 m深度范围内土层的压缩量组成,地裂缝的出现不单是地层厚度不同产生的差异沉降引起的,先存断裂面的作用也很大。由于断裂的存在以及其正断层的特点,沉降过程中上盘(南盘)的沉降得到了放大,而下盘(北盘)沉降缩小,不同结果导致地面沉降在断裂位置出现差异放大现象,导致地裂缝越来越严重。研究成果很好地解释西安地裂缝附近地面沉降的反常差异现象,对于进一步确定地裂缝的成因、预测其发展变化规律具有一定的作用。
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| 关 键 词： | 地面沉降 地裂缝 监测 分层标 数值模拟 |
| 收稿时间： | 2013-07-13 |
Numerical simulation and layerwise mark monitoring of land subsidence
and ground fissures of typical section in Xi’an |
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| WANG Qi-yao,PENG Jian-bing,JIANG Zhen-wei,TENG Hong-quan.Numerical simulation and layerwise mark monitoring of land subsidence
and ground fissures of typical section in Xi’an[J].Rock and Soil Mechanics,2014,35(11):3298-3302. |
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| Authors: | WANG Qi-yao PENG Jian-bing JIANG Zhen-wei TENG Hong-quan |
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| Institution: | 1. School of Civil Engineering, Chang’an University, Xi’an 710061, China;
2. School of Engineering Geology and Geomatics, Chang’an University, Xi’an 710054, China;
3. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang’an University, Xi’an 710054, China;
4. Shaanxi Institute of Geoenvironment Monitoring, Xi’an 710054, China |
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| Abstract: | By adopting Biot’s consolidation theory and the contact analysis of discontinuity surfaces, a two-dimensional calculation model containing two ground fissures is set up based on detailed groundwater and stratigraphic data in Xi’an. By using this model, the pumping-induced land subsidence under preexisting fault situation is simulated as much detailed as possible. Combining the land subsidence monitoring, the space distribution pattern is analyzed. The results indicate that the amount of compression of the soil deposit 100-300 m beneath contributes to the main settlement. The initiation of the ground fissures is not only for the differential subsidence caused by thickness change of soil deposit, but also the presence of fault. Because of the existing of the normal fault, the displacement of hanging wall is magnified, while the displacement is reduced during the ground subsidence. The reverse effect makes the scarp become larger and larger; so that the ground fissure hazards become more and more serious. The research results are benefit to further understanding the mechanisms of ground fissures, also can play some roles for predicting its development. |
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| Keywords: | land subsidence ground fissures monitoring layerwise mark numerical simulation |
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