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Deformation Mechanism and Its Control Strategy for Water-rich Sand Stratum in Tunnels of Qingdao

Author: ZhangZuo
Tutor: HeManChao
School: Beijing
Course: Geotechnical Engineering
Keywords: water-rich sand stratum ADECO-RS soil stability deformation mechanism control strategy
CLC: U455.4
Type: PhD thesis
Year: 2013
Downloads: 74
Quote: 0
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Abstract


Taking Qingdao subway tunnel case as example, theoretical analysis, laboratory tests and fieldtests were used to research on the engineering characteristics of Qingdao water-rich sand stratum. Itwas found that Qingdao sand was of high clay content and intensity, and the sand layer was thin, also,tunnel construction was often under a particular condition of soil-rock compound strata. Numericalsimulation and physical model experiment were combined to simulate the deformation processduring the tunnel excavation of water-rich sand stratum, and convergence deformation analysis,stress state constraints, extrusion and binding contrast judgment method were combined to analyzethe stability of Qingdao water rich-sand stratum tunnel, thus, it was revealed that the high-strengthsand layer is the most main damage factor of deformation mechanism. Considering practicalengineering, the corresponding control countermeasures were put forward, and it was pointed outthat ADECO-RS had a good control effect on the tunnel deformation of rich-water sand stratum bystrengthening core soil of tunnel face in advance. Also, the construction control technology ofADECO-RS was studied, and compressive strength tests and monitoring measures were adopted toanalyze the applicability of ADECO-RS, so, it was further verified that ADECO-RS was effectiveand that strata uplift and pile Angle control were key for construction control.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods
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