红层软土地基沉降监测及预测

研究目的:红层软泥岩是一种特殊岩土,具有易崩解、易风化、遇水易软化等特点。在这种特殊地质条件下,修建高等级铁路,必须要解决地基沉降问题。要准确地计算软土地基的沉降,特别是预测工后沉降,满足高速铁路暂行规定,仍是铁路建设中要解决的关键问题。研究方法:采用沉降管对经粉喷桩处理过的红层软土地基进行沉降监测,将得到沉降数据进行分析,分析软土地基沉降规律,通过指数函数进行拟合及预测其最终沉降量。研究结果:结果发现沉降管在红层软土地基的沉降监测得到了很好的应用,其预测结果表明经过粉喷桩处理后的软土地基的沉降满足高速铁路暂行规定。研究结论:证明该沉降管监测方法和预测方法应用在红层软土地基沉降中是合理的。

MONITORING AND FORECAST FOR SETTLEMENT OF RED ROCK SUBGRADE IN SOFT SOIL ZONE

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 rettlement 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.