摘要
在土压平横盾构施工过程中,将产生大量的废弃泥浆,如不能正确、有效地处理这些废弃泥浆将造成重大的环境污染与施工成本的升高。对这些废弃泥浆进行资源化处理是解决环境污染、降低施工成本的关键出路,其固结物的强度指标是评判这些产品质量高低的关键指标之一。为了减少养护时间与养护用地,需要应用这些固结产物的早期强度值来预测其长期强度值,以判断这些产品的质量。针对某市地铁1号线施工现场土样固结试验的强度测试结果,应用灰色理论非等间距GM(1,1)模型预测理论进行长期强度的预测分析,获得了较好的效果。通过分析研究结果可知:1)砂质废弃泥浆固结体的强度值普遍要大于黏质废弃泥浆固结体的强度,在早期强度方面,两者相差不大,但长期强度相差比较大;2)砂质废弃泥浆固结体实测数据的强度拟合曲线与预测数据的强度拟合曲线重叠得都比较好,而黏质废弃泥浆固结体的强度拟合曲线则重叠得不是很好,两者的相对误差比较大,特别是长期强度方面误差更大;3)砂质固结体与黏质固结体养护21 d时强度比较接近,并且都大于1.4 MPa(砂质)与1.3 MPa(黏质)。
During construction of earth pressure balance shield,a lot of waste mud is produced.If the waste mud could not be treated correctly and effectively,it would cause serious environmental pollution and rise the construction cost.The recycling of the waste mud is the key to solve the environmental pollution and reduce construction cost.The strength index of consolidation of the waste mud is one of key indicators of judging the quality of the consolidation.In order to reduce the curing time and land,early strength value of the consolidations must be applied to predict their long-term strength and determine the quality of these consolidations.According to the strength test results of consolidation of site soil sample of some city Metro No.1 line,the grey theory the non-equidistance GM(1,1)model is used in the paper to predict their long strength.The good effect is obtained.The research results are as follows.1)The consolidation strength of sandy mud is greater than the clayey mud’s.In terms of early strength,the difference is not quite,but their difference on long-term strength is larger.2)The fitting curves of strength of the measured and forecasted data of sand mud are overlapped relative well,but overlapping of the fitting curves of clayey mud is not good and the relative error is large.In particular the error is bigger in terms of long-term strength.The 21 days strength of consolidations of sandy mud and clayey mud is closer,and they are greater than 1.4 MPa(sandy),and 1.3 MPa(clayey).
作者
王振宇
阳军生
王星华
WANG Zhenyu;YANG Junsheng;WANG Xinghua(School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第7期1792-1798,共7页
Journal of Railway Science and Engineering
基金
湖南省科技厅重点基金资助项目(2015SK20682-2)。
