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| MONITORING AND FORECAST FOR SETTLEMENT OF RED ROCK SUBGRADE IN SOFT SOIL ZONE |
| QIU En-xi, Xie Qiang, LIU Jun-xin |
| Civil engineering department of /southwest Jiaotong University |
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Abstract Research purpose: Red rock is a special terrane and it is easy to disintegrate weather and be softened after absorbing water. Constructing high criterion railways under this special geological condition, it is essential to solve subgrade in soft soil zone subsidence problems and accurately figure out the subsidence, and especially to forecast the subsidence after construction. Satisfying the temporarily criterion of high-speed railway is still a vital problem to be solved.
Research method: In this paper, the author analyzed the subsidence data gained by monitoring for settlement of red rock subgrade in soft soil zone after powder-spraying pile disposal adopting subsidence-pipe and the rules of subsidence for subgrade in soft soil zone, and made fitting by exponential function and forecast its final settlement value.
Research result: It is found that subsidence-pipe is made good use in the monitoring for settlement of red rock subgrade in soft soil zone, and the subsidence of subgrade in soft soil zone after powder-spraying pile disposal satisfies the temporarily criterion of high-speed railway.
Research conclusion: So it is reasonable to use subsidence-pipe monitoring and forecast means in red rock subgrade in soft soil zone.
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Received: 22 September 2005
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2006, Vol. 23 
