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Effects of deep soil mixing on existing shield tunnels in soft soil ground

Underground Space 2022年第4期7卷 724-733页

作者： Huangsong Pan Liyuan Tong Zhansheng Wang Tao Yang Institution of Geotechnical Engineering Southeast UniversityNanjing 210096China Senior Engineer Suzhou Rail Transit Group LtdSuzhou 400045China

To mitigate the impact of adjacent construction on existing shield tunnels,deep soil mixing(DSM)has been widely used to reinforce the soft soil ground around shield ***,the construction of DSM may cause the movement of existing shield tunnels under soft soil and sensitive ground conditions,and reasonable installation parameters will reduce the impact of DSM construction on the existing shield *** on the field tests of DSM installation parameters and a program of field measurements of existing shield tunnels during the DSM construction in Suzhou,the reasonable installation parameters of DSM were selected,and the movement of soil behind the soil mixing walls(SMWs)during multirow DSM installation was *** movement of the shield tunnels caused by DSM construction were discussed in *** field test results showed that the DSM columns installed at a higher speed and a lower water-cement ratio enlarged the movement of the surrounding *** DSM should be installed at a lower speed and a higher watercement ratio to reduce the movement of the shield *** field measurement results showed that the displacement of the tunnel lining was primarily caused by the construction of DSM zones beside the shield tunnels,which led to vertical compression and horizontal expansion of the tunnel *** construction of DSM immediately above the shield tunnels caused uplift to the *** addition,the deformed shapes of the two shield tunnels were asymmetric,and the displacement of the spring lining was larger than that of the *** taking the reasonable installation parameters of DSM and under the protection of the SMWs,the deformation of the shield tunnels caused by the construction of DSM was effectively controlled,and the maximum displacement was within the control value of the shield tunnels in this study.

关键词： deep soil mixing Soft soil Shield tunnel Field tests Field measurement

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Bearing Capacity Assessment of Collapsible soils Improved by deep soil mixing Using Finite Element Method

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Open Journal of Geology 2016年第9期6卷 1055-1068页

作者： Pouya Kavandi Alireza Firoozfar Mohammad Amin Hemmati Young Researchers and Elite Club Zanjan Branch Islamic Azad University Zanjan Iran University of Zanjan Zanjan Iran Department of Civil Engineering Zanjan Branch Islamic Azad University Zanjan Iran

Problematic soils usually cause considerable problems to engineering projects. As an example, soil structure collapse caused by moisture increment or rising underground water level results in huge settlements. This type of problematic soil, named collapsible soil, can cause dramatic problems and should be amended where exists. Today, the use of different techniques for soil reinforcement and soil improvement is widely used to treat soil properties. One of these methods is deep soil mixing (DSM) method. This method becomes more important in the cases of studying and examining collapsible soils. In this research, the settlement of amended collapsible soils, applying deep soil mixing method, is examined. The experiments show that soil amendment using this method, well prevents the settlement of collapsible soils giving rise to bearing capacity.

关键词： Collapsible soil Settlement deep soil mixing Finite Element Method

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Transportation infrastructure settlement and heave distress:challenges and solutions

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第11期13卷 850-857页

作者： Anand J.PUPPALA Bhaskar C.S.CHITTOORI Department of Civil Engineering The University of Texas at ArlingtonArlingtonTX 76019USA

Transportation agencies spend millions of dollars annually to repair civil transportation infrastructure including pavements,earth structures and approach slabs distressed by soft compressible soils and expansive *** research studies performed at the University of Texas at Arlington(UTA) focused on stabilizing these problematic soils so that they will provide better and more stable support to the transportation *** paper focuses on a summary of two major distresses and mechanisms,and remedial measures for addressing these distress problems.A combined lime-cement stabilization method is fully evaluated in providing better support of pavement infrastructure,and these results are described *** major transportation infrastructure problem involving bridge approach slabs requires different treatment methods,and these results are briefly *** a part of the recently completed research study assessments,both shallow and deep soil treatment methods for stabilizing soils are fully evaluated for their effectiveness in arresting the distress posed to the pavements and bridge approach *** results along with a few future research needs are presented in this paper.

关键词： Ground improvement deep soil mixing Settlements Heaving Instrumentation Inclinometers

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