探地雷达在湿陷性黄土挖填方高边坡土体性状探测中的应用

王韵; 王红雨; 李其星; 亢文涛

doi:10.16031/j.cnki.issn.1003-8035.202201008

探地雷达在湿陷性黄土挖填方高边坡土体性状探测中的应用

doi: 10.16031/j.cnki.issn.1003-8035.202201008

1.
宁夏大学土木与水利工程学院，宁夏银川　750021
2.
宁夏送变电工程有限公司，宁夏银川　750001

基金项目: 国家自然科学基金项目（41962016）；妙岭750kV变电站科技进步项目（SGNXSB00BDJS2100567）；宁夏大学研究生创新项目（GIP2021-26）

详细信息

作者简介:
王韵：王　韵（1996-），女，重庆人，硕士研究生，主要从事边坡稳定性研究。E-mail：wy-slime@foxmail.com

通讯作者:
王红雨（1961-），男，宁夏银川人，博士，教授，主要从事水工及岩土工程研究。E-mail：why.nxts@163.com

中图分类号: P642.22
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出版历程
- 收稿日期: 2022-01-10
- 修回日期: 2022-03-14
- 网络出版日期: 2022-12-30
- 刊出日期: 2023-04-25

Application of the ground-penetrating radar technology in detection of soil properties of the high cutting and filling slopes in collapsible loess area

1.
School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia　750021, China
2.
Ningxia Power Transmission and Transformation Engineering Co. Ltd., Yinchuan, Ningxia　750001, China

摘要

摘要: 在湿陷性黄土丘陵山区通过平山造地开辟建筑场地，施工后高挖填方边坡变形特征及其交界线在坡面出露位置土体内部性状是边坡稳定性评价的关键环节。为掌握西电东送重要枢纽——同心妙岭变电站湿陷性黄土高边坡稳定性，在该场地挖、填方区域边坡顶端布设了长度为416 m和372 m的测线，同时在挖填交界线两侧分别布设了长度为15 m和20 m的测线，利用pulseEKKO PRO专业型探地雷达，在所选测线上以0.5 m间隔为测点实施相关探测工作。结果表明：高挖方边坡波谱特征图像和地勘报告相同位置处土层分布一致，反射波较杂乱，边坡内部存在卸荷裂缝、零星破碎带等现象；高填方边坡无裂缝、局部沉陷等异常反射波面，填土均匀，填土下伏自重湿陷性黄土，土体存在潜在危险；挖填交界区域有较明显的挖填方交界线，该交界线坡度较缓，过渡均匀；交界线左侧（挖方区）探测波形复杂，岩性种类多，土体密实度高，右侧（填方区）波形规则，土性单一，土体密实度低，挖填方土性的差异性易导致不均匀沉降。研究结果可为平山造地建筑场地的高边坡支护设计与施工提供基础资料。
- 探地雷达 /
- 湿陷性黄土 /
- 高边坡 /
- 挖填交界带 /
- 土体内部性状
Abstract: Building sites are created by leveling hills and creating land in the hilly mountainous areas of collapsible loess. The deformation characteristics of the high slopes of excavation and filling and the internal properties of the soil at the exposed position of the boundary line are the key aspect of slope stability evaluation. To investigate the stability of the collapsible loess high slope for the Tongxin Miaoling transformer station from the important hub of the West-East power transmission project, this study conducted field detection tests using professional ground-penetrating radar (GPR) of model pulseEKKO PRO, Survey lines with lengths of 416 m and 372 m were laid at the top of the slope in the excavation area and the fill area. Meanwhile, survey lines of 15 m and 20 m in length were laid on both sides of the excavation and filling boundary. GPR is used to carry out detection work on all survey lines at 0.5 m intervals. The results show that the wave spectrum characteristics image of the high excavation slope is consistent with the soil distribution at the same location in the geological survey results. Meanwhile, its reflected wave is messier, which indicates that there are unloading cracks and sporadic fracture zones inside the slope. There is no abnormal reflective wave surface such as cracks and local subsidence on the high fill slope, and its filling soil is uniform. The original soil in the high fill slope area is self-weight collapsing loess, thus the soil of the high fill slope has potential risks. The boundary area of excavation and filling has a more obvious boundary line of excavation and filling, which has a slow slope and uniform transition. The detection waveform on the side of the boundary line is complex, with many types of lithology, and high soil compactness, while the right side has regular waveforms, single soil properties, low soil compactness, and differences in soil properties between excavation and filling.easily lead to unenen settlement. These results could provide a reference for the design and construction of the high side slope of the cutting hills to the backfill ditch project.
- ground penetrating radar /
- collapsible loess /
- high slope /
- boundary line of excavating and filling /
- internal properties of the soil body

HTML全文

图 1 妙岭变电站场地示意图

Figure 1. Miaoling substation site

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图 2 探地雷达测线布置

Figure 2. GPR survey line layout

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图 3 挖方边坡探地雷达波谱图

Figure 3. GPR spectrum of excavation slope

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图 4 挖方边坡地质剖面图

Figure 4. Geological section of excavation slope

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图 5 填方边坡探地雷达波谱图

Figure 5. GPR spectrum of filling slope

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图 6 填方边坡地质剖面图

Figure 6. Geological section of filling slope

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图 7 挖填方交界区域探地雷达波谱图

Figure 7. GPR spectrum of the excavation and filling boundary area

下载: 全尺寸图片幻灯片

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