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1、东财土力学与地基基础在线作业三（Easternmoney soil mechanics and foundation online homework three）What is the degree of consolidation at this time?.A. 10%B. 20%C. 51.8%D. 45.6%The correct answer: C5. a retaining wall, the slope of the back of the wall = 30 degrees, the wall height of 5m, the wall of cohesionless soi
2、l specific gravity = 17.6kN/m3, and the internal friction angle phi = 30 degrees. Based on the earth pressure theory of Kulun, the magnitude, direction and location of the active earth pressure are calculated. Take Phi 0 = phi = 30 degrees. ()A. active earth pressure Ea=147KN/mB. active earth pressu
3、re Ea=247KN/mC. active earth pressure Ea=177KN/mD. active earth pressure Ea=127KN/mThe correct answer: A6. a construction site to fill, excavation volume is 2000m3, is the source of earthwork excavation, from a nearby mound by soil survey, the proportion of 2.70, 15% moisture content, void ratio is
4、0.60, water filling requirements 17%, dry density is 17.6KN/m3, ask soil field soil gravity, dry and severe saturation is how much? ()A. P =16.875 (KN/m3), P d=19.406 (KN/m3), Sr=67.5%B. P =26.875 (KN/m3), P d=20.406 (KN/m3), Sr=57.5%C. P =16.475 (KN/m3), P d=18.406 (KN/m3), Sr=63.5The correct answe
5、r: A6. generally use the vibration shock method to determine ()A. minimum void ratioB. maximum void ratioC. minimum porosityD. maximum porosityThe correct answer: A6. silt soil ()A. natural void ratio is greater than 1 and less than 1.5B. is 1.5 larger than natural void ratioC. natural void ratio is
6、 less than 1D. natural void ratio is greater than 1.5 and less than 2The correct answer: A7., the building construction speed is faster, the foundation soil permeability condition is bad, the shear strength index determination method should choose ().A. unconsolidated undrained shear testB. consolid
7、ated undrained shear testC. drained shear testD. direct shear testThe correct answer: A7. a square plinth, depth of D=1m, 120 tons under load, the foundation for the sand, severe natural gamma = 19kN/m3, sat = 21kN/m3 with saturated gamma, phi = 30 degrees, deep groundwater level 1.0m. For the found
8、ation size, the stability of the foundation is required and the safety factor is not less than ().A. 3.0mB. 4.1mC. 2,.2mD. 1.8mThe correct answer: C7. of a saturated specimen unconfined compression test, unconfined compressive strength was 160kPa, if on the same soil for three axis shear test, ambie
9、nt pressure is 180kPa, ask the total vertical stress for many samples will be broken? ()A. sigma 1 =340kpaB. sigma 1 =240kpaC. sigma 1 =440kpaD. sigma 1 =140kpaThe correct answer: A8., a retaining wall, high 6m, the wall back upright and smooth, fill surface horizontal and uniformly distributed load
10、 q=10kPa. The indexes of physical and mechanical properties of filling soil are as follows: c=0, Phi =34 degrees, gamma =19kN/m3. Test the active earth pressure of retaining wall. ()A. 46.7kN/mB. 1421.9kN/mC. 166.5kN/mD. 1005kN/mThe correct answer: B8., the construction quality of the filling soil a
11、nd the evaluation of the compactness of the soil are the most commonly used indexesA. effective weightB. soil particle relative densityC. saturation densityD. dry densityThe correct answer: D9. a consolidation of saturated cohesive soil in three triaxial undrained test in C, =0, is =28 degrees if th
12、e specimen is 1=200kPa and the sigma 3=150kPa, the measured pore water pressure u=l00kPa, ask the specimen will be damaged (?)A. wont breakB. damageC. cant judgeThe correct answer: A9. a cohesive soil sample by consolidated undrained test effective shear strength index of C =24kPa =22, with degrees,
13、 if the samples were consolidated drained test to failure in =200kPa under ambient pressure, the Lord stress at failure. ()A. sigma 1 =490kPaB. sigma 1 =500kPaC. sigma 1 =510kPaD. sigma 1 =520kPaThe correct answer: C9. there are several kinds of sedimentary genetic types in QuaternaryA. 3B. 5C. 4D.
14、2The correct answer: C10. self weight stress, that isGravity stress of A. FoundationLateral self weight stress in B. soilC. effective self weight stressD. vertical effective self weight stressThe correct answer: D10. when the foundation is destroyed by the whole sliding, the pressure acting on the b
15、ase must be greater than ().A. plastic loadB. critical loadC. ultimate loadBearing capacity of D. FoundationThe correct answer: C10. soil shear tests have three kinds of test methods, namely, fast shear, consolidation, fast shear and slow shear. Generally, the order of internal friction angle is ().
16、A. slow shear consolidation quick shear quick shearB. quick cut consolidation quick shear slow shearC. consolidation, quick shear quick shear slow shearThe correct answer: A11. under the same depth under the base, the additional stress at the end of the strip foundation is the central part of the st
17、rip foundationA. doubleB. halfC. two timesD. four timesThe correct answer: C11. earth pressure means ()A. refers to the lateral pressure on the back of the wall due to the weight of the backfillB. refers to the lateral pressure on the back of a retaining wall due to dead weight or external loadC. re
18、fers to the lateral pressure on the back of the retaining wall due to the external loadD. refers to the pressure on the back of the retaining wall due to dead weight or external loadThe correct answer: B11. The known retaining walls are H=10m high, and the back fill is medium sand. Gamma = 18kN/m3,
19、phi = 30 degrees, vertical and smooth back wall, fill surface level. Calculate the total resting earth pressure E0. ()A. E0=280KN/mB. E0=3000KN/mC. E0=350KN/mD. E0=450KN/mThe correct answer: D12., the main principles of preventing shifting sands are: ()A. reduces or eliminates the water head differe
20、nce between the groundwater inside and outside the foundation pitB. growth; seepage pathC. balancing hydraulic powerBoth D. are rightThe correct answer: D12. calculation shows that the reinforcement of common reinforced concrete pile is usually controlled by ().Lifting and lifting strength of A. pil
21、esStrength of B. pilesSettlement of C. pileDeformation of D. pileThe correct answer: A12. a known retaining wall height H=8.0m, vertical and smooth back wall, fill surface level. The filling behind the wall is medium sand, with a severe gamma =18.0kN/m3, a saturated gamma sat=20kN/m3, and an interna
22、l friction angle of phi =30 degrees. Calculate the total active earth pressure acting on the retaining wall. ()A. 180kN/mB. 202kN/mC. 192kN/mD. 152kN/mThe correct answer: C13. the soil particle gradation curve is more smooth, and the inhomogeneous coefficient Ku value is more ()A. constantSmall B.C.
23、D. cant judgeThe correct answer: C13. after selecting the appropriate type of foundation, the foundation can be satisfied without treatment. This is called ()A. artificial foundationB. deep foundationC. natural foundationD. shallow foundationThe correct answer: C14. relationship between deformation
24、modulus and compressive modulusThe A. test condition is different, and the two are the compressibility indexes of soil, and they can be converted into each other in theoryB. test conditions are the same, the two are the same as the compressibility of soil indicators, in theory, can not be converted
25、into each otherC. test conditions are different, the two are the same soil compressibility index, both in theory can not be converted to each otherD. test conditions are different, the two are different soil compression indicators, both in theory can be converted to each otherThe correct answer: A14
26、. are known to a concrete retaining wall height H=6.0m, back erect, smooth, surface level filling wall, filling is divided into two layers: the first layer with gamma 1=19.0 kN/m3, cohesion c1=10kPa and internal friction angle of 1=16 degrees; second severe gamma 2=17.0 kN/m3, c2=0 cohesion, interna
27、l friction angle of 1 DEG =30. Test the active earth pressure of retaining wall. ()A. 46.7kN/mB. 42.6kN/mC. 96.28kN/mD. 105kN/mThe correct answer: C14. groundwater can be divided into several categories according to their burial conditionsA. 5B. 4C. 2D. 3The correct answer: DFifteenThe data of a fou
28、ndation soil sample are as follows: the volume of ring knife is 60cm3, the quality of wet soil is 0.1204kg, the soil mass is 0.0992kg, and the relative density of soil particles is 2.71. The pore ratio e () is calculatedA. void ratio e=0.639B. void ratio e=0.539C. void ratio e=0.655D. void ratio e=0
29、.559The correct answer: A15. a basic ground size is 20m * 10m, the effect of 24000KN vertical load calculation: (1) if the load center, for the basal pressure; (2) if the eccentricity of ey=0, ex=0.5m, X for two points on the axis of the basal pressure? ()A. (1) P=140KN/m2 (2) Pmax=156KN/m2, Pmin=94
30、KN/m2B. (1) P=120KN/m2 (2) Pmax=166KN/m2, Pmin=84KN/m2C. (1) P=120KN/m2 (2) Pmax=156KN/m2, Pmin=88KN/m2D. (1) P=120KN/mThe correct answer: D15. if the foundation is laid on a natural ground, the additional stresses and deformations that do not cause the foundation are ()Lateral self weight stress in
31、 A. soilB. effective self weight stressC. vertical effective self weight stressD. basal additional pressureThe correct answer: D16., when the upper part of the foundation is weak and the lower part is not deep enough to bury a solid stratum, it is better to adopt ().A. pile foundationB. caissonC. di
32、aphragm wallD. strip foundationThe correct answer: A16. compaction method can only be applied to the leveling trench or local compaction ()A. heavy tamping methodB. dynamic consolidation methodC. I or frog rammerD. vibratory compactionThe correct answer: C17., the compressibility coefficient of a so
33、il is 0.16kPa-1, the strength index C=20kPa, phi = 30 degrees, if the large and small principal stresses acting on the soil sample are 350kPa and 150kPa respectively, ask if the soil sample is damaged If the minor principal stress is 100kPa, what is the maximum principal stress that the soil sample
34、can withstand? ()A. damage, sigma 1=269.3kpaB. does not destroy, sigma 1=269.3kpaC. damage, sigma 1=369.3kpaD. does not destroy, sigma 1=369.3kpaThe correct answer: D17. ordinary reinforced concrete square pile section length is usually (). The length of prefabricated piles on site is within ().A. 2
35、5 30m, 25 30mB. 300 500mm, 300 500mmC. 25 30m, 300 500mmD. 300 500mm, 25 30mThe correct answer: D18. the consolidation coefficient of the foundation soil of a project is Ck=1.5 * 10-3 cm2/S, which requires 100 days, and the consolidation degree reaches 90%. When the length of bagged sand wells is 15
36、m, the reasonable spacing of sand wells is calculated.A. 110cmB. 140cmC. 180cmD. 160cmThe correct answer: D19. the strength of the foundation depends on ().The relative stiffness of A. foundation, the compressibility of soil, and the size of plastic zone under the basementThe absolute stiffness of B
37、. foundation, the compressibility of soil, and the size of plastic zone under the basementThe relative deformation of C. foundation and subsoil, the compressibility of soil and the size of plastic zone under the basementD. relative stiffness of foundation and subsoil, compressibility of soil and siz
38、e of foundationThe correct answer: AThe three measured indexes of 19. soils are ()A. dry density, saturation density, porosityB. specific gravity, natural density and water contentC. pore ratio, saturation, dry densityD. specific gravity, natural density and porosityThe correct answer: BThe sand mat
39、erial of 19. sand cushion must have good compactness: ().A. medium and coarse sand, but not crushed stonesB. fine sand can be used as cushion and easy to compact, but its strength is not highC. should not use medium and coarse sand as cushionD. medium, coarse sand is good, can also use gravelE. fine
40、 sand can also be used as cushion, but it is difficult to compaction, and the strength is not highThe correct answer: D20. the groundwater level in the geological survey report refers toA. perched waterB. divingC. confined waterD. is wrongThe correct answer: B20. The known retaining walls are 10m hi
41、gh, the walls are vertical and smooth, and the surface of the fill is horizontal. The filling behind the wall is medium sand, and severe gamma = 18kN/m3,Saturation is gamma sat = 20kN/m3, Phi 1=30 degrees, the groundwater level is 6m off the wall, and the total active earth pressure and water pressu
42、re are calculated.A., Ea=278.7KN/m, Pw=80KN/mB., Ea=288.7KN/m, Pw=80KN/mC., Ea=278.7KN/m, Pw=70KN/mD., Ea=288.7KN/m, Pw=70KN/mThe correct answer: ATwo multiple-choice questions1. what is the final settlement of a foundation usually composed of three parts?A. instantaneous settlementSecondary consoli
43、dation settlement of B.C. over consolidation settlementD. consolidation settlementThe correct answer: ABD1. considering the influence of adjacent load on the settlement of the foundation, the spacing is not limitedA long pile is used in one of the two adjacent buildings of the A.The average settleme
44、nt of buildings affected by B. is less than 70mmThe length of C. affected buildings is higher than that of L / Hf 1.5The average settlement of buildings affected by D. is less than 60mmThe correct answer: ABC2., geotechnical engineering investigation specification, in accordance with the building fo
45、undation design code of the building safety grade division, according to the following () conditions, geotechnical engineering is divided into three gradesA. seismic fortification intensityUnfavorable geological process of B.C. geomorphic featuresSoil condition of D. FoundationE. safety rating of bu
46、ildingsThe correct answer: ABCDE2. in situ tests include: ()Static load test of A. FoundationB. side pressure testField shear test of C. soilD. penetration testThe correct answer: ABCD2. factors affecting the impact of heavy hammer compaction are: ()A. hammer weight and fall distanceB. diameter of the hammer headNumber of times of C. tampingD. types of compacted soil