云南安宁某污水处理厂地基沉降成因分析

发布时间：2018-01-03 01:20

本文关键词：云南安宁某污水处理厂地基沉降成因分析　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在经济飞速发展的当下时节,城市建筑与工业建筑越来越高,规模也越来越大,随之地面是否会发生沉降变形从而影响建筑物的安全成为了一个不可逃避的问题,我国的北京、上海、天津、西安等地均出现地面沉降,地表沉降变形的危害较大。安宁某污水处理厂地面变形问题较为突出,原因复杂,因此对地表沉降变形的成因和机理进行研究可为场区的治理提供重要的依据,并为类似工程建设提供借鉴,具有一定的理论意义和工程实用价值。监测资料显示,研究区现有最大沉降量位于生化池西南角268mm,均质池南侧163mm,其中还有不均匀差异沉降。本文对主要土层采取定性分析法研究其物理、力学特性及参数特性,并结合FLAC3D进行数值模拟,定量分析导致地基沉降的影响因素,将模拟结果与监测点位移量进行比对拟合,从而得出反演参数,利用反演参数对沉降影响因素进行敏感性分析。分析结果表明研究区有机质层不均匀分布,厚度大于60cm,强度低压缩性高,在上部荷载和降雨情况下发生变形,导致地面沉降;其敏感性分析显示在厚度小于0.3m时影响较小,2m时影响最大(研究有机质土厚度只考虑0-4m区间),位移量在土层厚度为0～2m时增长较快,超过2m后,位移量继续增大,但增长趋势变缓,斜率为0.161。素填土是在荷载和降雨情况下土体颗粒的压密,孔隙变小产生固结沉降,导致地面变形;素填土对厚度比较敏感,在厚度为3m之前沉降量增长比较缓慢,3m以后增长较快,基本呈线性增长趋势,斜率为0.189。溶洞由于规模较小,并采用了有效的处理措施,因此对地表沉降的影响较小;溶洞对洞径大小比较敏感,洞径为5m时位移量达到最大值(研究溶洞洞径只考虑了 0-8m范围),其他洞径变化引起的位移量变化值较小。最后得出结论,研究区生化池沉降变形各影响因素依次为:(1)有机质土(2)素填土(3)溶洞(4)荷载;均质池沉降变形影响因素依次为:(1)有机质土(2)素填土(3)荷载。
[Abstract]:In the current season of rapid economic development, city construction and industrial construction is more and more high, the scale is also growing, then whether the ground settlement will occur deformation to affect the safety of the building has become an inescapable problem in China, Beijing, Shanghai, Tianjin, Xi'an and other places have surface subsidence, ground settlement the deformation of great harm. The peace of a sewage treatment plant in the ground deformation problem is more prominent, the reasons are complicated, so the surface subsidence causes and mechanism of deformation of the study can provide important basis for field management, and provide the reference for similar engineering construction, has certain theoretical significance and practical value. The monitoring data show. The study area is located in the largest settlement of existing southwest corner of 268mm biochemical pool, pool on the south side of the 163mm which are homogeneous, uneven settlement difference. This paper take analysis of the qualitative method of soil physics, The mechanical properties and characteristics, and combined with FLAC3D numerical simulation, quantitative analysis of factors that influence the settlement of foundation, the simulation results and the monitoring points of displacement comparison fitting, so that the inversion parameters on settlement influence factors of the sensitivity analysis using the inversion parameters. Analysis results show that the study area of organic layer distribution, the thickness of more than 60cm, the low strength high compressibility, deformation in the upper load and rainfall condition, leading to land subsidence; the sensitivity analysis showed little influence on the thickness of less than 0.3m, 2m when the greatest impact (Study of organic soil thickness considering only 0-4m interval), the displacement in the thickness of 0 ~ 2m growth, after more than 2m, the displacement continues to increase, but the growth trend slowed down, the slope is 0.161. soil in load and soil particles under the condition of rainfall compaction, pore becomes ever born consolidation settlement, lead Ground deformation; soil is sensitive to the thickness in the thickness of 3M before the settlement of relatively slow growth, 3M growth, the basic increase linearly. The slope of 0.189. cave due to the small scale and the effective treatment measures, therefore it had little effect on the surface settlement of hole size; karst sensitive the hole diameter is 5m maximum displacement (of cave diameter only consider the range of 0-8m), the other hole diameter variation of displacement caused by small value. The final conclusion, the study area of biochemical pool settlement of the factors are as follows: (1) soil organic matter soil (3 (2) karst) (4) load; settlement of homogeneous pool related factors were: (1) organic soil (2) soil (3) load.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU433

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