| 连云港徐圩地面沉降BOTDR监测与评价 |
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| 引用本文： | 刘苏平,施斌,张诚成,顾凯,孙梦雅,杨鹏,卢毅.连云港徐圩地面沉降BOTDR监测与评价[J].水文地质工程地质,2018,0(5):158-158. |
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| 作者姓名： | 刘苏平 施斌 张诚成 顾凯 孙梦雅 杨鹏 卢毅 |
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| 作者单位： | 1.南京大学地球科学与工程学院，江苏 南京210023；2.国土资源部地裂缝地质灾害重点实验室（江苏省地质调查研究院），江苏 南京210049 |
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| 基金项目： | 国家自然科学基金重点项目（41230636）；国家重大科研仪器研制项目资助（41427801）；国家自然科学青年基金（41502274）；国土资源部公益性科研行业专项基金（201511055）；江苏省研究生科研与实践创新计划项目（KYCX17_0031） |
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| 摘 要： | 连云港市位于苏北沿海地区，地面沉降灾害面积较大，多地沉降速率超过20 mm/a，徐圩的沉降现状尤为严重。为了能够对徐圩地区的地面沉降进行精细化观测，文章采用BOTDR分布式光纤感测技术，对徐圩镇127 m深的钻孔地层进行了两年多的全断面精细化监测。结果表明:徐圩镇共有四个承压含水层组，I-1隔水层和I-2隔水层土体沉降量分别占总沉降量的70.29 %、24.59 %，抽水层的土体最大沉降量仅占比1.38 %。I-1隔水层和I-2隔水层的地层岩性包括淤泥质黏土（L2）、亚黏土（L3）、亚砂土夹粉砂（L4），总厚度为44 m，由于抽水过程中隔水层向含水层失水，导致该隔水层土体固结压缩。同时，工程建设附加荷载对地面沉降的影响也不可忽视。徐圩地区现阶段的沉降仍在继续发生，但沉降速率有减小的趋势。BOTDR技术可有效获取地面沉降钻孔全断面的土层变形分布信息，为地面沉降评价提供了一种精细化的分布式监测手段。
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| 关 键 词： | 地面沉降 BOTDR 分布式光纤监测 连云港 |
| 收稿时间： | 2018-03-18 |
| 修稿时间： | 2018-05-03 |
Monitoring and evaluation of land subsidence based on BOTDR in Xuwei near Lianyungang |
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| LIU Suping,SHI Bin,ZHANG Chengcheng,GU Kai,SUN Mengya,YANG Peng,LU Yi.Monitoring and evaluation of land subsidence based on BOTDR in Xuwei near Lianyungang[J].Hydrogeology and Engineering Geology,2018,0(5):158-158. |
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| Authors: | LIU Suping SHI Bin ZHANG Chengcheng GU Kai SUN Mengya YANG Peng LU Yi |
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| Affiliation: | 1.School of Earth Sciences and Engineering, Nanjing University, Nanjing，Jiangsu210023, China; 2.Key Laboratory of Earth Fissures Geological Disaster，Ministry of Land and Resource (Geological Survey of Jiangsu Province), Nanjing, Jiangsu210049，China |
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| Abstract: | Located in northern of Jiangsu Province near the coastal area, Lianyungang is undergoing large-scale subsidence, and the rate of land subsidence is more than 20 mm/a in a lot places, such as Xuwei. Aiming at observing land subsidence intensively, the authors adopted the Brillouin optical time domain reflectometry (BOTDR) technique to monitoring a borehole with a depth of 127 m in Xuwei for more than 2 years. The results show that there are four confined aquifer groups in Xuwei, the accumulated settlement of soil in aquitard I-1 and I-2 accounts for 70.29% and 24.59%, respectively, and the maximum settlement of aquifer accounts for 1.38 %. The soil of 44 m in thickness in aquitard I-1 and I-2 includs muddy clay (L2), mild clay (L3), silt and sand layer (L4), and the main cause for subsidence is water from aquitard flowing to adjacent aquifer. Furthermore, additional load from engineering play a significant role in development of subsidence. The current situation of land subsidence in Xuwei is that the settlement is on the rise while its rate is decreasing. Therefore, BOTDR technique can monitoring the deformation information of all layers, which can help to monitor and evaluate the land subsidence in the study area. |
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