| 济宁城区地面沉降固结特性分析及压缩层组划分 |
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| 引用本文： | 韩飞,韩红梅,邹连庆.济宁城区地面沉降固结特性分析及压缩层组划分[J].山东国土资源,2019,35(11). |
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| 作者姓名： | 韩飞 韩红梅 邹连庆 |
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| 作者单位： | 济宁市土地综合整治中心,济宁市土地综合整治中心,山东省地质环境监测总站 |
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| 摘 要： | 基于济宁城区2处钻孔沉积物的物理力学相关试验数据,综合分析地层的物理特征、塑性特征和压缩特征,计算有效自重压力和前期固结压力,判断地层固结状态,研究地层物理力学特性变化与地面沉降的相关联系,并进行地面沉降压缩层组的划分。结果表明:济宁城区204.5m以浅土层的物理特性的总体趋势受自重压力控制,孔隙水压力的变化是相对变化的重要控制因素,次级波动与矿物成分和颗粒分布关系密切,同时也是多重因素共同叠加的结果。100m以浅地层属中压缩性,正常固结状态,100～200m地层属低压缩性,超固结状态,产生原因与地下水过量开采有关,是历史地面沉降发生的主要层位;该区地层可以划分为5个特征较为明显的地面沉降压缩层组。
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| 关 键 词： | 地面沉降 自重应力 前期固结压力 固结状态 压缩特性 济宁 |
Analysis on Consolidation Characteristics of Land Subsidence and Classification of Compression Layers in Jining City |
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| HAN Fei,HAN Hongmei and ZOU Lianqing.Analysis on Consolidation Characteristics of Land Subsidence and Classification of Compression Layers in Jining City[J].Land and Resources in SHANDONG Province,2019,35(11). |
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| Authors: | HAN Fei HAN Hongmei and ZOU Lianqing |
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| Abstract: | Based on experimental data of physical mechanics of two borehole sediments in Jining city, physical characteristics, plastic characteristics and compression characteristics of strata have been analyzed comprehensively, the effective gravity pressure and preconsolidation pressure have been calculated, the consolidation state of strata has been judged, the relationship between the change of physical mechanics characteristics of strata and land subsidence has been studied, and the ground subsidence compression layer group has been divided. It is showed that the general trend of physical properties of soil layers above 204.5m in Jining city is controlled by gravity pressure, and the change of pore water pressure is an important controlling factor of relative change. Secondary fluctuation is closely related to mineral composition and particle distribution, and is also the result of multiple factors combined. The strata above 100m are of medium compressibility and normal consolidation, while the strata between 100m and 200m are of low compressibility and over consolidation. The causes are related to the excessive exploitation of groundwater, and are the main strata of historical land subsidence. The strata in this area can be divided into five strata with obvious characteristics of land subsidence compression. |
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| Keywords: | Land subsidence self-weight stress pre-consolidation pressure consolidation state compression characteristics Jining city |
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