The second semester of the 2018-2019 academic year of online education in Xiamen University Review of Geotechnical Engineering Course I. Selective Questions 1 The mechanism of dynamic consolidation for foundation reinforcement is (C) A produces strong tamping energy and strong shock waves in the foundation. B produces greater ramming energy, and produces strong additional force in the foundation, which affects the soil mass. Compaction Principle of C Soil Compactable in a Certain Water Content Range and a Certain Tamping Energy D produces strong tamping energy and strong shear stress in the foundation. The function of cushion layer in CFG pile in composite foundation is (A) A Guarantee Pile and Soil Bearing Load Together When the B cushion is thicker, the load ratio of pile is relatively higher. The setting of C cushion increases the stress concentration at the bottom of the foundation and increases the bearing capacity. When D cushion is thicker, the horizontal load shared by piles is larger. 3 Permafrost is characterized by (C) A contains solid water or may contain part of liquid water B. The freezing state lasts for more than one year. C freeze lasts for at least three yearsD. The water body has been completely frozen without liquid water. 4 Foundation composed of the following soil layers: I miscellaneous fill and plain fill, II low saturation silt and cohesive soil, III collapsible loess, IV silty soil, V expansive soil. Foundation suitable for dynamic compaction treatment is (A) A B II, III, IV C III, IV, V D I, II, VI, II, III 5 (C) The ratio of compression wave velocity of rock mass to compression wave velocity of rock mass is square. When selecting rock mass and rock mass to measure wave velocity, attention should be paid to their representativeness. A Saturated Uniaxial B Compressive Strength C D Tensile IndexIntegrity index 6 Typical characteristics of loess do not include (C) A Loess is a continental sediment in arid and semi-arid climate B is porous and has macropore visible to the naked eye. CThe main component of granules is clay, which generally accounts for more than 50%. D surface layer is collapsible and easy to produce potential erosion to form caves. 7 Among the following soil materials which can be used as compaction filling is (A) A Sand with Crushed StoneB Low Saturation Silt and Muddy Soil C Expansive Clay D Fine Sand 8 In permafrost areas, buildings should be avoided except minor projects (D) A Unsaturated Frozen Soil Section B Less Frozen Soil and More Frozen Soil Section C Section D with low groundwater level or low frozen soil levelTransition zone between thaw zone and permafrost zone 9 For the calculation of liquefaction index, the following is correct (B) The calculation depth of liquefaction index A should be 10m in general. B 10~15mThe weight function in the range is 10. With the increase of C depth, the value of weight function decreases correspondingly. D When the measured standard penetration technology is greater than the critical standard penetration number, the liquefaction index should be negative. 10 Regarding the thickness of replacement cushion, the following statement is correct (C) In general, the thickness of replacement cushion should not be too thick, not more than 0.6m The thickness of B replacement cushion is generally 4-5 m, which is more suitable. C replacement cushion thickness is generally not more than 3m, otherwise construction is difficult. The effect of D-replacement cushion is more significant when the thickness of Dreplacement cushion is generally 0.5m. 11 The construction method often used in gravel pile construction is (A) A vibroflotation methodB Vibration C Impact D Stirring Method 12 Replacement materials are not available for replacement cushion construction (B) A gravel soil and sandy soil B C plain soil and sandy soil D silt and lime soilCollapsible loess 13 The requirements for calculating expansive soil foundation are (D) The suitable vertical pressure for calculating the expansion rate of A expansion should be the sum of self-weight stress and additional stress. The calculation depth of B expansion should be the smaller value of the depth of atmospheric influence and the depth of water immersion influence. The calculated depth of C contraction deformation is the depth of atmospheric influence. DWhen calculating shrinkage deformation, the water content of each soil layer is considered as a curve change. 14 The following statement is correct (D)

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