|Table of Contents|

Safety monitoring and analysis of shield ultra-deep receiving well excavation in mixed stratum(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
144-152
Research Field:
隧道工程
Publishing date:

Info

Title:
Safety monitoring and analysis of shield ultra-deep receiving well excavation in mixed stratum
Author(s):
SUN Zexin1; 2;  WANG Yongchen1; 3;  LU Yanzhu2;  WANG Nanzhou2;  XUE Huaiyu2
(1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, Liaoning, China; 2. Geo-engineering Investigation Institute of Jiangsu Province, Nanjing 210019, Jiangsu, China; 3. Institute of Deep Engineering and Intelligent Technology, Northeastern University, Shenyang 110819, Liaoning, China)
Keywords:
foundation pit engineering;  ultra-deep excavation;  mixed stratum;  retaining structure;  depth effect;  deformation behavior
PACS:
TU473
DOI:
10.19815/j.jace.2021.11049
Abstract:
The 45.4 m ultra-deep shield well receiving foundation pit in clay-sandstone mixed stratum of a Nanjing river-crossing tunnel was used as the research object. Based on geological survey data and construction logs, the measured data of the support system for the excavation and support process of the ultra-deep foundation pit, including the top uplift of the diaphragm wall, deep lateral deformation and column uplift were analyzed. The deformation behavior of the ultra-deep foundation pit in the mixed stratum was discussed. The results show that the position of maximum deformation Hm is between 0.34He and 1.28He(He is the excavation depth)when the excavation depth of the foundation pit is less than 20 m. The lateral deformation position basically does not change when the excavation depth exceeds 20 m. The excavation of mixed stratum has a great influence on the deep lateral deformation of the diaphragm wall of the foundation pit. The excavation of clay soil layer has obvious depth effect, but the excavation depth effect of sandstone strata is not obvious. In the case, the maximum lateral deformation δhm of diaphragm wall varies between 0.013%He and 0.044%He, and the displacement is small. The integrity of the supporting system has a good inhibitory effect on the displacement of the diaphragm wall. When the excavation depth is large, the reduction of the thickness of the confined aquifer will cause a short-term rebound effect, which will cause the uplift of the column and the diaphragm wall. The uplift and subsidence stage of the entire support system has obvious synchronization correlation.

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Last Update: 2023-07-01