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水泥改良土融沉对地层位移场影响的数值分析(PDF/HTML)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2017年02期
Page:
136-142
Column:
研究论文
publishdate:
2017-03-23

Article Info:/Info

Title:
Numerical analysis of the influence of cemented soil thawing settlement on the stratum displacement field
Article ID:
1000-2006(2017)02-0136-07
Author(s):
WANG Xiaobin1 YANG Ping2* HU Jun2
1. Management Department of Changshu Institute of Technology,Changshu 215500,China;
2.College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Keywords:
cement soil thawing settlement ground displacement field numerical simulation
Classification number :
U456
DOI:
10.3969/j.issn.1000-2006.2017.02.020
Document Code:
A
Abstract:
【Objective】 Research on the influence of cemented soil thawing settlement on the stratum displacement field can provide a theoretical basis for the application of cemented soil freezing methods in urban underground engineering. 【Method】Taking the shield tunneling horizontal freezing reinforcement project in Nanjing metro line 10 as an example, a 3-D numerical simulation analysis is conducted on the stratum displacement field caused by the cemented soil thawing settlement. The effect of the thaw settlement coefficient, thickness of the covering soil, and size of the frozen soil wall on the cemented soil displacement field are studied using the single factor analysis. It was found from research that the amount of maximum surface thawing settlement is 12.811 cm as the frozen soil had not improved; when the cement-mixed ratio is increased to 12%, the maximum surface thawing settlement amount reduces to 1.521 cm, revealing that mixing of cement can significantly decrease the thawing settlement of the frozen soil. 【Conclusion】 In the freezing thawing settlement of the cement soil, the deeper the soil is, the larger the thawing settlement displacement is and the smaller the thawing settlement range is. The surface thaw displacement shows a basin shaped settlement, with the maximum settlement displacement located at the outlet. With the increase in the thawing settlement coefficient, the amount of maximum surface settlement increases gradually, but the soil displacement distribution does not change; the larger the covering soil thickness, the smaller is the surface settlement. When the frozen wall size is increased, the rate of development of surface displacement decreases; thus, the surface settlement time increases, and finally the thaw displacement increases.

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Last Update: 2017-03-23