The indicator reflecting the soil permeability is:

A$.$ coefficient of permeability;

B$.$ relative compaction;

C$.$ coefficient of uniformity;

D$.$ coefficient of compressibility

The surface layer of a site is $4m$ thick silty clay, with natural gravity $=18k\frac{N}{m^3},$ below which is saturated clay layer with saturated gravity ${}_{\text{s}\text{a}\text{t}}=19k\frac{N}{m^3},$ the groundwater level is $4m$ below the surface, calculate the vertical self$-$weight stress of soil at $2m$ below the surface is:

A$.72$kPa;

B$.36$kPa;

C$.16$kPa;

D$.38$kPa

According to the limit equilibrium condition of soil, the included angle between the failure surface and the minor principal plane is

A$.45+\frac{}{2}$;

B$.45-\frac{}{2}$;

C$.90+$;

D$.90-$

Under the action of one$-$way eccentric load, if the base reaction is trapezoidal along the length of the foundation, the relationship between the eccentricity and the length of the rectangular foundation is

A$.>>\frac{1}{6}$

B$.e=\frac{1}{6}$

C$.e\frac{1}{6}$

D$.e<mfrac><mrow><mn>1</mn></mrow><mrow><mn>6</mn></mrow></mfrac>$

When the degree of consolidation of a cohesive soil foundation reaches $40\%,$ the settlement is $100mm,$ and the final consolidation settlement is

A$.400mm$;

B$.200mm$;

C$.250mm$;

D$.140mm$

Among many factors influencing the earth pressure of retaining wall, is the most important one.

A$.$ displacement direction and size of retaining wall;

B$.$ height of retaining wall;

C$.$ stiffness of retaining wall;

D$.$ type of backfill

The strength failure of soil is usually due to:

A$.$ the base pressure is greater than the compressive strength of soil;

B$.$ the tensile strength of soil is too low;

C$.$ the shear stress of a point in the soil reaches the shear strength of the soil;

D$.$ caused by shear failure on the action surface of maximum shear stress