Field Test of Mechanical Properties of Large Diameter Steel Jacking Pipe Under Construction and Temperature Load in Soft Soil

doi:10.16183/j.cnki.jsjtu.2018.11.005

Abstract

Abstract:

Circumferential and longitudinal strain of steel jacking pipe which is buried in deep soft soil and jacked with long distance was monitored on the spot to study internal force of pipe under construction and temperature load. The results show that internal force of a fixed section changes little due to jacking distance. For different sections, the one that is closer to the jacking machine head is affected less by jacking force. Compressive stress predominates in longitudinal direction, and is mainly affected by jacking force. However, circumferential stress is mainly due to buried depth, and maybe tensile with deep buried on top of pipe. Circumferential stress and longitudinal stress are coupling especially with large buried depth. Eccentricity of jacking force has a great effect on internal force of pipe. When jacking force is applied, longitudinal stress changes by a large margin, and returns to steady after jacking force removed. The stress in pipe can reach 25 MPa caused by 6 ℃ temperature difference, which hardly influences the using of the pipe. There is little distinction between longitudinal stress and circumferential stress. However, extreme range of temperature should be valued, and may cause destroying.

Key words: large diameter steel jacking-pipe, mechanical properties, site monitoring, construction stress, temperature stress

CLC Number:

TU990.3

MA Helong, LIAO Chencong, WANG Jianhua, LI Yaoliang. Field Test of Mechanical Properties of Large Diameter Steel Jacking Pipe Under Construction and Temperature Load in Soft Soil[J]. Journal of Shanghai Jiao Tong University, 2018, 52(11): 1444-1451.

Figures/Tables 18

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