Abstract
With the human activities gradually into the ocean, especially the implementation of the strategy of the Belt and Road, engineering construction will be more and more involved in the coral sand foundation, and the survey of foundation design specification, has not yet listed coral reef types of geotechnical, field test research on characteristics of coral sand foundation scholars both at home and abroad. However, after the coral reefs are artificially disturbed and blown into the land area, the mixed land foundation with coarse and fine grained soil is formed. In this paper, the characteristics of non-uniform and weak interbedded coral soil are obtained by dynamic field touchdown, pit exploration, particle analysis and Rayleigh wave method. Through triaxial shear tests with different porosity ratios, the results show that the shear strength index of coral sand is higher than that of natural silt sand and silt, and the coralline sand has certain cohesion. Through field loading plate test and dynamic contrast analysis, the reasonable loading plate impact depth, dynamic agent number and coral hybrid bearing capacity of soil foundation has good correlation, and through the analysis of dynamic agent number and the foundation bearing capacity, dynamic agent number and the experience formula of the modulus of deformation, and research has certain reference value to similar projects.
Highlights
Coral sand is a special kind of rock and soil medium, mainly distributed in warm waters on both sides of the equator
Sun-ZongXun [1], [2] coral reef engineering geology is presented according to the characteristics of coral reefs, and summarizes the mechanics characteristics of coral sand foundation, high void ratio, high friction Angle and low strength, particle crushing is the main factors influencing the deformation and strength characteristics of coral sand, Huo-Yingxi [3] and others in the red sea coral reefs packing of compaction effect, Wang-Baofeng [4] on frequency coral sand foundation settlement are studied, and Yan-YuPing [5] and others in the Bahamas coral reef engineering geology features, zhao-TingHuan [6] on the coral reef engineering geology are discussed
Field the 47 set of loading plate test, load test in situ into action after penetration tests (N63.5), 1.0 b, respectively 1.5b, 2.0b, 2.5b, 3.0b depth within the scope of the dynamic ground stroke compared with loading plate test result, the average figure in the b as the loading plate width, N63.5 for certain depth scope through the length and the wall friction modified moving average number, f0 as the characteristic value of subgrade bearing capacity, the result is shown in figure 6 ~ 10
Summary
Coral sand is a special kind of rock and soil medium, mainly distributed in warm waters on both sides of the equator. Sun-ZongXun [1], [2] coral reef engineering geology is presented according to the characteristics of coral reefs, and summarizes the mechanics characteristics of coral sand foundation, high void ratio, high friction Angle and low strength, particle crushing is the main factors influencing the deformation and strength characteristics of coral sand, Huo-Yingxi [3] and others in the red sea coral reefs packing of compaction effect, Wang-Baofeng [4] on frequency coral sand foundation settlement are studied, and Yan-YuPing [5] and others in the Bahamas coral reef engineering geology features, zhao-TingHuan [6] on the coral reef engineering geology are discussed She YinPeng [7] obtained the conclusion that coral sand shows a special shear stress-displacement curve, and the internal friction Angle increases with the increase of particle size. Through the contrastive analysis of the dynamic and static load test, obtained the correlation of stroke and the foundation bearing capacity, to quickly and efficiently detect the coral hybrid bearing capacity of soil foundation, has the extremely positive significance, and can provide the reference for the similar engineering and scientific research
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