Abstract
Coastal cement soil modified by nanoclay (NCS) has particular research significance as a modification approach to improve the high compressibility of coastal cement soil (CCS). At curing ages of 7 days and 28 days, consolidation and SEM tests were performed on 6 groups of NCS samples with a nanoclay content between 0% and 10% and 6 groups of CCS samples with a cement content between 10 and 20%, and a compression prediction model was established based on the test results. Test results show that (1) there is a linear interval for the improvement effect of the increment of cement content on the compression of CCS samples. In this test, the cement content in this interval is between 12% and 18%. CCS with a cement content of 18% is preferred. (2) The improvement effect on the compression of the sample is better with a nanoclay content of 4% and 8%, but poor with a content of 2%. At a consolidation pressure between 100 kPa and 800 kPa, NCS with a nanoclay content of 4% is preferred. (3) Adhesion is better with a nanoclay content of 4%, and the filling effect is better with a content of 8%. (4) The cosine‐power function‐exponential model is established, and the measured data are fitted, and a prediction model for the compression amount of CCS and NCS is established.
Highlights
With the continuous development of economic construction, determining how to carry out engineering construction in coastal soft soil areas has become a problem that many countries need to solve during the development process
Existing research results show that high compressibility is the main factor restricting the use of coastal cement soil (CCS) as foundation soil [12, 13], cement has a better effect on improving the compressibility of soft soil [14, 15]
When the consolidation pressure is between 0 kPa and 400 kPa, the compression of the sample increases slow at the beginning and fast; between 400 kPa and 1600 kPa, it was first fast and slow. e compression of the sample decreases continuously with the increase of cement content at the same consolidation pressure
Summary
With the continuous development of economic construction, determining how to carry out engineering construction in coastal soft soil areas has become a problem that many countries need to solve during the development process. Coastal soft soil has the characteristics of high natural water content, large compressibility, and low strength [5], which makes it difficult to meet design requirements and requires cement reinforcement [6, 7]. Kwon et al [11] carried out unconfined compressive strength (UCS) tests on cement soil with different clay content and particle fineness. E sample strength was high, and the water absorption was low, with a clay content of 14.3%. Existing research results show that high compressibility is the main factor restricting the use of coastal cement soil (CCS) as foundation soil [12, 13], cement has a better effect on improving the compressibility of soft soil [14, 15]
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