回填土压缩性质的试验研究

Experimental Study on the Compressibility of Backfilling Clay and Silt Soil

地下水位较高的地区,在城市地下隧道上部回填土内铺设市政管线,回填土压缩性及其工后沉降大小直接关系到市政管线运行的安全。通过在试验室对回填土实际工况的模拟,利用室内土工试验方法,测定回填土在饱和自重压力下的湿陷系数,计算其浸水饱和后的压缩量。试验结果表明,粘质回填土压实系数对其压缩性会产生明显的影响,压实系数小于或等于0.9时均可能产生较大工后沉降,危及管线的运行安全。

While the pipelines are placed in backfilling soil above the underground tunnels in the city, the compressibility and settlement of the backfilling soil are directly related to the safe operation of the municipal pipeline networks, especially in the high water level regions. By means of the experimental simulation and study of the backfilling soil, and using soil test method, the coefficient of collapsibility is measured and the compression deformation of saturated backfilling clay soil and silt soil is calculated. The experimental results show that the compaction factor of clay soil has a great impact upon compressibility, and if the compaction factor of backfilling soil is less than or equal to 0.9, it will lead to more settlement and endanger the safety of municipal pipeline networks.