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本文通过离心试验,研究了饱和粘土在考虑土体自重应力作用下的固结变形特性。试验结果表明,离心试验与常规试验相比,两者压缩特性一致,而固结特性差别较大。离心试验求得的固结速率比太沙基固结理论推算的结果要快,而与有限线性应变固结理论推算的结果相一致。从理论和实验两方面说明,常规固结试验中忽略了主体的自重应力水平,用测定的固结系数推算实际较厚软粘土层的固结变形特性,将会过慢的估计固结完成的时间。此外,离心试验比常规试验的固结历时大大缩短,用离心技术可提高固结试验效率。
In this paper, the deformation behavior of saturated clay under the effect of soil self-gravity stress is studied by centrifugal test. The test results show that compared with the conventional test, the compression characteristics of the two are the same, and the consolidation characteristics differ greatly. The consolidation rate obtained by the centrifugal test is faster than that predicted by the Terzaghi consolidation theory, and is consistent with the result of the finite linear strain consolidation theory. From both theory and experiment, it is shown that in the conventional consolidation test, the self-weight stress level of the main body is neglected, and the consolidation deformation coefficient of the actual thicker soft clay layer is estimated by using the determined consolidation coefficient, and the consolidation will be estimated too slowly. time. In addition, the centrifugation test is much shorter than that of the conventional test, and the centrifuge test technique can improve the consolidation test efficiency.