moocSoil Mechanics课后答案(mooc完整答案)

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Introduction

Exercises

1、后答Which of the following engineering issues are closely related to geotechnical engineering（ ）
A、案m案Foundation excavation
B、整答Pouring floor
C、后答Highway roadbed
D、案m案Steel structure design

2、整答The后答 part of rock, soil and groundwater involved in civil engineering construction is also commonly regarded as geotechnical engineering（ ）

Chapter1 Basic characteristics and engineering classification of soils

Exercises

1、Which of the following statement about the three-phase ratio index of the physical properties of soil is 案m案correct（ ）
A、The整答 void ratio of the soil will never be greater than 1
B、The后答 water content of the soil is the ratio of the mass of water to the total mass of the soil
C、The案m案 natural water content and void ratio of the soil are the basic indexes that can be directly measured
D、The整答 porosity is the ratio of the volume of voids to the total volume of the soil

2、The后答 structure of sandy soil usually belongs to（ ）
A、Single grain fabric
B、案m案Honeycomb fabric
C、整答Flocculent fabric
D、Any of the above

3、The pore volume of fully saturated soil is equal to the volume of water（ ）

4、The greater the plasticity index of cohesive soil, the greater the hardness of the soil（ ）

Chapter 2 Permeability of soil and seepage force

Exercises

1、According to geological exploration, saturated unit weight of a certain soil layer is 19.6KN / m3. Its critical hydraulic gradient is（ ）
A、1.0
B、0.63
C、0.51
D、0.70

2、Darcy’s law shows that the discharge velocity bears a linear relation with （ ）for sand.
A、the seepage time
B、the cross-sectional area of seepage
C、the hydraulic gradient
D、the seepage distance

3、Due to the existence of capillary cohesion, some sand sculptures can be built in the seaside area（ ）

4、The coefficient of permeability of different soil layers in the layered soil are equal（ ）

Chapter 3 Stress calculation in soil

Exercises

1、When calculating geostatic stress of the soil layer, ( ) should be used for permeable soil with (i.e., sand and clay) below the groundwater level.
A、unit weight
B、saturated unit weight
C、buoyant unit weight
D、dry unit weight

2、The stress state of the ground soil under the strip foundation can be simplified as ( ) for analysis.
A、one-dimensional stress
B、plane strain
C、plane stress
D、three-dimensional stress

3、The groundwater level of a foundation is 2.0 m below the ground. When the groundwater level drops to 5.0 m, the vertical geostatic stress of the soil at 3.0 m below the ground will decrease（ ）

4、The effective stress principle shows that the total stress is equal to the sum of the effective stress and the pore water pressure（ ）

Chapter 4 Soil compressibility and calculation of foundation settlement

Exercises

1、H is the maximum drainage distance. When the soil layer is drained on one side, H is the thickness of the soil layer. When the soil layer is drained on both sides, H is（ ）of the thickness of the soil layer.
A、1times
B、0.5times
C、1.5times
D、2times

2、The three stages of the load-settlement curve in the load test include ( )
A、linear deformation stage
B、local deformation stage
C、total destruction stage
D、unconfirmed

3、When the soil is compressed and deformed after loading and then unloaded and rebounded, some of the deformation that cannot be recovered is called elastic deformation ( )

4、It is generally assumed that the compression deformation after loading of the soil is related to the discharge of water and gas in the soil from the pores and the continued shrinkage of the pores（ ）

Chapter 5 Shear strength

Exercises

1、Which of the following is the main advantage of the triaxial compression test（ ）
A、Simple test operation
B、Can carry out unconsolidated undrained shear test (UU test)
C、Simple equipment
D、Drainage conditions can be controlled

2、For cohesive soil, the total stress expression of Coulomb's law is （ ）

3、The limit equilibrium condition of the soil is the relationship of the soil between the principal stress in the soil and the shear strength parameter of the soil under the limit equilibrium state（ ）

4、The advantage of the triaxial shear test is that it can control the drainage conditions and determine the change of pore water pressure of the soil sample during the shear process. （ ）

Chapter 6 Bearing capacity

Exercises

1、The most important difference between the ultimate bearing capacity model of ground of Terzaghi and that of Prandtl is that（ ）
A、the soil of ground is heterogeneous
B、the friction of the bottom surface of the ground is considered
C、the effect of load eccentricity is considered
D、local shear failure of foundation is assumed

2、Which of the following statements about the field load test is wrong（ ）
A、Compared with the laboratory test, the error caused by the disturbance of the sample is reduced
B、Determining modulus of compressibility
C、Determining modulus of deformation
D、When excavating the test pit, the elevation of the bottom of the pit is equal to that of the foundation

3、Based on the calculation formula of limit load derived by Prandtl’s theory, we need to consider the influence of factors such as the shape of foundation, eccentric load, the depth of foundation, etc. according to the actual situation.（ ）

4、The study of the bearing capacity of ground is for reasonable foundation design. （ ）

Chapter 7 Slope stability analysis

Exercises

1、There is a cohesionless dry soil slope with a slope angle of 26 °. According to field investigation, the internal friction angle of the soil is 31 °, then the stability safety factor of the soil slope is（ ）
A、1.23
B、0.81
C、1.19
D、0.84

2、In the Bishop method of arc slide surface, if ( ) is equal to 0, it is the simplified Bishop method.
A、pore water pressure
B、the difference of tangential force on both sides of soil strip
C、the difference of normal forces on both sides of the soil strip
D、friction on the slide surface

3、When seepage occurs along the slope, the stability safety factor of the cohesionless soil slope is almost not reduced（ ）

4、For the stability analysis of cohesive soil slopes, it is often theoretically assumed that the sliding surface of the slope is approximately a cylindrical surface and the sliding soil body is regarded as a rigid body to simplify the calculation. （ ）

Chapter 8 Earth pressure and retaining walls

Exercises

1、Among the many factors that affect the earth pressure of the retaining wall, ( ) is the most important factor
A、the height of retaining wall
B、the stiffness of retaining wall
C、the displacement direction and size of retaining wall
D、the filling type of retaining wall

2、When the fill behind the retaining wall is in the passive limit equilibrium state, the earth pressure acting on the retaining wall is（ ）
A、passive earth pressure
B、active earth pressure
C、at-rest earth pressure
D、geostatic stress

3、According to the displacement conditions of the wall after loading, there are three basic types of earth pressure including at-rest earth pressure, active earth pressure, and passive earth pressure.（ ）

4、For the part of the retaining wall below the groundwater level, the hydrostatic pressure acting on the back of the retaining wall should also be considered in the calculation（ ）

Final exam

Final exam

1、When the normative method determines the formula for calculating bearing capacity of ground, fa is（ ）
A、characteristic value of bearing capacity of ground
B、modified characteristic value of bearing capacity of ground
C、correction coefficient of bearing capacity of ground
D、uncertain

2、Which kind of failure mode of foundation usually has continuous sliding surface（ ）
A、general shear failure
B、local shear failure
C、punching shear failure
D、uncertain

3、Among the three-phase composition of soil, there is no one of the following in dry soil（ ）
A、solid
B、liquid
C、gas
D、uncertain

4、Which of the following weathered products has been eroded, transported, and deposited through various geological processes, and finally formed soil（ ）
A、rock
B、the core of earth
C、the mantle of earth
D、concrete

5、The structure of sandy soil usually belongs to（ ）
A、Single grain fabric
B、Honeycomb fabric
C、Flocculent fabric
D、Any of the above

6、Normally, the lateral pressure of the soil on the back of the retaining wall is called（ ）
A、geostatic stress
B、earth pressure
C、additional pressure
D、vertical pressure

7、The expression of the effective stress principle is（ ）
A、effective stress is equal to the sum of total stress and pore water pressure
B、effective stress is equal to the difference between total stress and pore water pressure
C、effective stress is equal to the product of total stress and pore water pressure
D、effective stress is equal to the ratio of total stress to pore water pressure

8、Which of the following belongs to a natural slope（ ）
A、The foundation pit of construction engineering
B、The embankment of highway
C、Natural hillside
D、Tunnel support system

9、Which of the following is the main advantage of the triaxial compression test（ ）
A、Simple test operation
B、Can carry out unconsolidated undrained shear test (UU test)
C、Simple equipment
D、Drainage conditions can be controlled

10、Which of the following statements about the field load test is wrong（ ）
A、Compared with the laboratory test, the error caused by the disturbance of the sample is reduced
B、Determining modulus of compressibility
C、Determining modulus of deformation
D、When excavating the test pit, the elevation of the bottom of the pit is equal to that of the foundation

11、Which of the following are basic physical indicators of soil（ ）
A、Soil specific gravity
B、Natural water content
C、Void ratio
D、Natural density of soil

12、During the seepage and consolidation process of saturated soil, the pore water pressure ( ) and effective stress ( ) in the soil
A、remain unchanged
B、gradually decrease
C、decrease first and then increase
D、gradually increase

13、Which of the following statements about the calculation of base pressure under eccentric load are correct ( )
A、e<l/6，small eccentric compression，pmin>0 ，base pressure is trapezoidal distribution
B、e<l/12，small eccentric compression，pmin>0 ，base pressure is trapezoidal distribution
C、e>l/6，large eccentric compression, pmin <0, tensile stress zone appears on the base and base pressure is redistributed
D、e=l/12，critical eccentric compression, pmin = 0, base pressure is triangle distribution

14、According to the drainage and consolidation conditions, the triaxial shear test can be divided into（ ）
A、unconsolidated undrained test
B、consolidated undrained test
C、unconsolidated drained test
D、consolidated drained test

15、When local shear failure occurs on the foundation, the sliding surfaces on both sides of the foundation are discontinuous and incomplete（ ）

16、The corresponding load when the maximum plastic zone depth of the foundation is zero is the critical edge pressure（ ）

17、The Swedish method of slices assumes that the sliding soil body is a non-deformable rigid body and slides along the cylindrical surface as a whole（ ）

18、For non-cohesive soil slopes, when the stability safety factor K = 1, the slope angle is equal to the internal friction angle of the soil, also known as the natural angle of repose（ ）

19、Direction of resultant force of the earth pressure at rest is horizontal and the action point is located at H / 3 from the top of the retaining wall（ ）

20、According to the overconsolidation ratio of soil samples, the soil layer can be divided into normal consolidated soil, overconsolidated soil and underconsolidated soil（ ）

21、In the seepage and consolidation mechanical model of saturated soil, the pore water pressure is equal to 0 and the effective stress is equal to the total stress at the instant of external force application（ ）

22、When the soil reaches the limit equilibrium state, the location of shear failure surface must be on the maximum shear stress surface（ ）

23、The advantage of the triaxial shear test is that it can control the drainage conditions and measure the change of pore water pressure of the soil sample during the shear process（ ）

24、According to Darcy's law, the greater the hydraulic gradient of the same soil sample, the faster the penetration rate （ ）

学习通Soil Mechanics

Soil Mechanics是土力学的英文名称，是土木工程专业中的一门重要课程。其主要研究土壤在不同条件下的物理和力学特性，以及土壤的各种力学性质和行为规律。

学习通Soil Mechanics是一个网络学习平台，专注于土力学课程的教学、学习和交流。它旨在帮助土木工程学生系统地学习和掌握土壤力学的理论和实践知识，从而提高其在工程实践中的能力和素质。

课程结构

学习通Soil Mechanics的课程结构主要包括以下部分：

• 土壤力学基础知识
• 固结与沉降
• 土压力与支撑结构
• 土体稳定分析
• 地基处理与加固
• 地下水与渗流

每个部分都有相应的学习资料和课件，包括视频讲解、课程笔记、练习题和考试。学生可以根据自己的时间和进度自由选择课程内容，同时可通过在线讨论和互动来交流和学习。

学习方式

学习通Soil Mechanics提供多种学习方式和工具，以满足不同学生的学习需求：

• 视频讲解：课程视频由资深教师讲解，涵盖课程的核心概念和理论知识。
• 课程笔记：学生可以通过在线阅读或下载课程笔记，加深对课程内容的理解和记忆。
• 在线练习：每个课程都设有相关的练习题，帮助学生巩固所学知识。
• 在线考试：学生可以通过完成在线考试来评估自己的学习效果和掌握程度。
• 在线讨论：学生可以在学习通Soil Mechanics的在线讨论区与同学和教师交流，提出问题和分享心得。

优势与价值

学习通Soil Mechanics的优势在于其丰富的学习资源和灵活的学习方式。它不仅涵盖了土力学课程的核心知识和内容，还通过在线讨论和互动来促进学生之间的交流和合作，提高学生的学习效果和成果。

此外，学习通Soil Mechanics还为学生提供了很多实用工具和资源，如在线课件、课程笔记和练习题等，帮助学生更加深入和全面地掌握所学知识。通过学习通Soil Mechanics，学生不仅可以获得专业知识和技能，还可以提高自身的综合素质和竞争力，为未来的职业发展打下坚实的基础。

总结

学习通Soil Mechanics是一款专业的网络学习平台，为土木工程学生提供了高质量的土力学课程资源和工具。通过学习通Soil Mechanics，学生可以系统地学习和掌握土壤力学的理论和实践知识，提高在工程实践中的能力和素质。我们相信，学习通Soil Mechanics将成为学生学习土力学的重要平台和资源，为他们的职业发展和未来的成功奠定坚实的基础。

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