深部含水层黏弹塑固结模型及压密模拟

李洪然; 张阿根

深部含水层黏弹塑固结模型及压密模拟

李洪然¹,
张阿根²

1.
同济大学地下建筑与工程系上海 200092;
3.
中国地质调查局地面沉降研究中心上海 200002

基金项目:

国土资源部和上海市共同资助项目(200413000020)

详细信息

中图分类号: TU443
计量
- 文章访问数: 2964
- HTML全文浏览量: 148
- PDF下载量: 743
- 被引次数: 0
出版历程
- 收稿日期: 2011-10-20
- 修回日期: 2012-03-22
- 刊出日期: 2012-06-25

VISCOELASTIC-PLASTIC CONSOLIDATION MODEL FOR DEEP AQUIFER COMPACTION WITH TIME

LI Hongran¹,
ZHANG Agen²

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092;
2.
Center of Land Subsidence Research,CGS. ,Shanghai 200092

摘要

摘要: 上海市曾遭受了严重的地面沉降灾害,主要由于浅部含水层开采引发浅部土层固结所致。之后采取了回灌浅部含水层并转向开采深部含水层的措施,地面沉降得到了有效控制。但21世纪初,通过水位及分层沉降监测,发现随着开采量增加,深部含水层也会成为主要压密土层。其变形呈现出显著的非线性压密特征,即使水位普遍抬升,压密仍然持续,开展其固结压密机理模型研究对地面沉降防治十分必要。传统太沙基理论认为砂土骨架是瞬时变形的,忽略了流变性本质,因此无法解释该现象。基于国内外学者的研究,考虑了前期固结压力前后流变性的差异,建立了深部含水层黏弹塑固结压密模型。通过试验获取了相关参数,结合塘桥F16分层标监测结果,对第四含水层长期压密变形进行了模拟。模拟结果很好地反映了含水层长期非线性压密行为,研究结果对指导防治地面沉降有实际意义。
- 深部含水层 /
- 非线性压密 /
- 黏弹塑 /
- 分层标
Abstract: Shanghai had suffered severe ground subsidence, mainly due to the shallow soil consolidation caused by shallow aquifer exploitation. Thereafter, pumping aquifer is adjusted from the shallow aquifers to deep ones. The land subsidence was effectively controlled. However, in the early 21 century, through water level and borehole extensometer monitoring, it found that deep aquifer will become the major compaction layer with the increasing exploitation. The deformation of the deep aquifer shows a significant nonlinear compaction characteristic. Even if the water level is generally uplift, the compaction continues. It is very necessary to research the consolidation mechanism model for the ground subsidence prevention and control. The traditional Terzaghi theory regards sand skeleton as instantaneous materials, ignoring the rheological nature. So there is no way to explain the above-mentioned phenomenon. Based on the studies of scholars at home and abroad, taking into account the differences in rheological properties before and after the pre-consolidation pressure, the viscoelastic-plastic consolidation model for deep aquifer is established. The deep fourth aquifer long-term compaction deformation is simulated based on the test parameters, combined with the Tangqiao F16 borehole extensometer monitoring results. The simulation result shows that the model used well reflects the aquifer long-term nonlinear compaction behavior. The study result is helpful to guide the prevention and control of ground settlement.
- Deep aquifer /
- Nonlinear compaction /
- Viscoelastic-plastic /
- Borehole extensometer

HTML全文

参考文献(1)

[1] 张云, 薛禹群,吴吉春,等.抽灌水条件下上海砂土层的变形特征和变形参数[J].水利学报, 2006, 37 (5): 560~566.
Zhang Yun, Xue Yuqun, Wu Jichun, et al. Characteristics and parameters of san d strata deformation due to groundwater pumping in Shanghai. Journal of Hydraulic Engineering, 2006, 37 (5): 560~566.
[2] 张云, 薛禹群,李勤奋.上海现阶段主要沉降层及其变形特征分析[J].水文地质工程地质, 2003, 30 (5): 6~11.
Zhang Yun, Xue Yuqun, Li Qinfen. Current prominent subsidence layer and it deformation properties in Shanghai. Hydrological Geology and Engineering Geology, 2003, 30 (5): 6~11.
[3] 魏子新. 上海第四承压含水层应力-应变分析[J].水文地质工程地质, 2002, 29 (1): 1~4.
Wei Zixin. The stress-strain analysis of the 4th confined aquifer in Shanghai city. Hydrological Geology and Engineering Geology, 2002, 29 (1): 1~4.
[4] 张阿根, 魏子新.上海地面沉降研究的过去、现在与未来[J].水文地质工程地质, 2002, 29 (5): 72~75.
Zhang Agen, Wei Zixin. Past, present and future research on land subsidence in Shanghai city. Hydrological Geology and Engineering Geology, 2002, 29 (5): 72~75.
[5] 张云. 一维地面沉降模型及其求解[J].工程地质学报, 2002, 10 (4): 434~437.
Zhang Yun. One-dimensional model for land subsidence and its solution. Journal of Engineering Geology, 2002, 10 (4): 434~437.
[6] Corapcioglu MY and Brutsaert W.Viscoelastic aquifer model applied to subsidence due to pumping. Water Resources Research, 1977, 13 (3): 597~604.
[7] 吴林高, 缪俊发.抽灌水作用下土层变形及应力应变本构律的研究[J].地球科学, 1995, 20 (5): 581~588.
Wu Lingao, Miao Junfa. Soil layer deformation and determination of the constitutive law on the stress-strain of soils under pumping-recharge. Earth Science, 1995, 20 (5): 581~588.
[8] Leung CF,Lee FH and Yet NS.The role of particle breakage in pile creep in sand. Can.Geotech. J. ,1996, 33 : 888~898.
[9] Colliat-Dangus JL,Desrues J and Foray P.Triaxial testing of granular soil under elevated cell pressure. In: Advanced Triaxial Testing of Soil and Rock, Philadelphia, ASTM, 1988, 290~310.
[10] Mejia CA,Vaid YP and Negussey D.Time dependent behavior of sand. In:.Conf.on Rheology and Soil Mechanics, Coventry, England, 1988, 101~105.
[11] Jerry A.Yamamuro, Paul Abopp and Poul V Lade. One-dimensional compression of sand at high pressures. Journal of Geotechnical Engineering, 1996, 122 (2): 147~154.
[12] 叶淑君. 区域地面沉降模型的研究与应用 .南京:南京大学博士论文, 2004.
Ye Shujun. Study on the Regional Land Subsidence Model and Its Application. Nanjing: Nanjing University, 2004.
[13] 张云, 薛禹群,施小清,等.饱和砂性土非线性蠕变模型试验研究[J].岩土力学, 2005, 26 (12): 1869~1873.
Zhang Yun, Xue Yuqun, Shi Xiaoqing, et al. Study on nonlinear creep model for saturated sand. Rock and Soil Mechanics, 2005, 26 (12): 1869~1873.
[14] 薛禹群, 张云,叶淑君,等.我国地面沉降若干问题研究[J].高校地质学报, 2006, 12 (2): 153~160.
Xue Yuqun, Zhang Yun, Ye Shujun, et al. Research on the problems of land subsidence in China. Geological Journa1 of China Universities, 2006, 12 (2): 153~160.
[15] Taylor DW and Merchant W.A theory of clay consolidation accounting for secondary compression. J.Math. Phys. ,1940, 19 : 167~185.
[16] 吴林高, 缪俊发.黏弹性多孔介质第三越流理论的研究[J].同济大学学报(自然科学版), 1989, 17 (1): 21~23.
Wu Lingao, Miao Junfa. The research for the third type of leaky theory in porous media with viscoelastic properties. Journal of Tongji University(Natural Science), 1989, 17 (1): 21~23.
[17] 佴磊, 杨健.上海浦东地面沉降分析中土层变形面沉降参数分析[J].长春地质学院学报, 1997, 27 (4): 429~434.
Er Lei, Yang Jian. Analysis on the coefficient of subsidence at Pudong, Shanghai city. Journal of Changchun University of Earth Sciences.1997, 27 (4): 429~434.

施引文献

资源附件(0)

访问统计