常速率应变固结试验和常规固结试验对比分析

Analysis between Constant Rate of Strain Consolidation Tests and Conventional Consolidation Tests

软黏土的固结变形特性是各类工程建筑基础设计及沉降计算的重要依据。针对连云港和淮安软黏土进行常速率应变固结试验和常规固结试验,结果表明:常速率应变固结试验能够大大缩短固结试验时间;固结屈服压力和固结系数会随着应变速率的增加而增加;当应变速率较小时,常速率应变固结试验和常规固结试验的固结屈服压力和固结系数具有较好的一致性,当应变速率较大时,由于试验过程中产生的孔隙水压力较大,常速率应变固结试验求得的试验结果比常规固结试验的偏大,因此应变速率是常速率应变固结试验的重要参数。

The characteristics of consolidation on clay is an important basis for the basic design of all types of engineering construction and calculations of settlement. Constant rate of strain consolidation tests and conventional consolidation tests for clay of Lianyungang and Huai＇an are caried out. The results show that： Constant rate of strain consolidation tests can greatly shorten the time of consolidation; consolidation yield stress and coefficient of consolidation increases with the strain-rate ; when the strain-rate is smaller, yield pressure and coefficient of consol- idation about constant rate of strain consolidation tests and conventional consolidation tests have a better consisten- cy, when the strain-rate is larger, results of constant rate of strain consolidation tests are larger than conventional consolidation tests because of larger pore water pressure produced during the test, So the strain-rate is an important parameter for constant rate of strain consolidation test.