School of Surveying and Land Information Engineering, Henan Polytechnic University, Henan Jiaozuo, China.
School of Resources and Environment, Henan Polytechnic University, Henan Jiaozuo, China.
PLoS One. 2023 Jan 26;18(1):e0279832. doi: 10.1371/journal.pone.0279832. eCollection 2023.
After large-scale land consolidation in hilly loess region of the Loess Plateau in China, land subsidence has a wide affecting area and considerable difficulty of prevention. Hence, large-scale, stabilized, and continuous deformation monitoring is urgently needed for slopes. In this study, land consolidation zone in the loess platform area of Weinan, China, was selected as the object, and the 30-scene Sentinel-1A data in Jan, 2018 to Dec, 2019 were analyzed. The mean annual velocity of ground deformation was from -6.19 mm∙a-1 to 3.86 mm∙a-1, and Accumulated deformation velocity was within -8.49 mm∙a-1 to 7.24 mm∙a-1. Accumulated deformation of land consolidation changed with the seasons changing. The interrelationship between the spatiotemporal variations in ground subsidence and the precipitation, ground water, loess engineering properties was also discussed. Accumulated deformation of land consolidation changed with the seasons changing. The precipitation accelerated the subsidence by unexpected strong precipitation reflects that the infiltration of rainwater can lead to compacted loess deformation which caused by moistening effect. Under varying ground water environment, external loads may lead to soil collapse, resulting in non-uniform land subsidence. Co-compression deformation of original loess and compacted loess is main influencing factors of subsidence. These findings have important implications and significant positive effects on the prevention of potential hazard such as subsidence and side slope slip.
在中国黄土高原丘陵区大规模土地整治后，地面沉降的影响范围广泛，防治难度较大。因此，需要对边坡进行大规模、稳定和连续的变形监测。本研究选取中国渭南海螺沟黄土台地区土地整治区为研究对象，分析了 2018 年 1 月至 2019 年 12 月的 30 景 Sentinel-1A 数据。地面变形的年平均速度为-6.19mm·a-1至 3.86mm·a-1，累积变形速度为-8.49mm·a-1至 7.24mm·a-1。土地整治的累积变形随季节变化而变化。还讨论了地面沉降的时空变化与降水、地下水、黄土工程性质之间的相互关系。土地整治的累积变形随季节变化而变化。降水通过意外的强降水加速了沉降，这反映出雨水的渗透会导致因湿化效应而产生的压实黄土变形。在不同的地下水环境下，外部荷载可能会导致土壤崩塌，从而导致不均匀的地面沉降。原状黄土和压实黄土的共同压缩变形是沉降的主要影响因素。这些发现对预防沉降和边坡滑移等潜在灾害具有重要意义和积极影响。
