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