Ground Subsidence Triggered by the Overexploitation of Aquifers Affecting Urban Sites: The Case of Athens Coastal Zone along Faliro Bay (Greece)

Table 2

Physical and mechanical properties of the Quaternary fine-grained fluvial deposits [53–58].

	Sandy clay			Silty sand
	Unified Soil Classification System (USCS) classification
	CL			SM
	Min	Max	Av.	Min	Max	Av.
	Physical parameters
Dry unit weight, γd (KN/mᵌ)	10.7	18.8	15.69	14.8	22.4	18.28
Specific gravity, Gs	2.49	2.67	2.55	2.58	2.58	2.58
Liquid limit, LL (%)	21.2	57.5	36.53	N.P.	39.7	23.41
Plastic limit, PL (%)	12.9	27.8	19.73	N.P.	19.4	14.47
Plasticity index, PI (%)	2.1	33	16.87	N.P.	23.3	9.49
	Mechanical parameters
UC strength, qu (KN/m^2)	35	399	172	36	353	213,33
Compression index, Cc	0.09	0.32	0.2	0,11
	Shear box test (CD)
Cohesion, c (KN/m^2)	1	49	10.28	8.5	31	19.75
Friction angle, (°)	3	31	23.14	26	28	27
	Triaxial test (CUPP)
Cohesion, c (KN/m^2)	26	30	27.67	˗	˗	˗
Cohesion, (KN/m^2)	23	34	27.33	25		˗
Friction angle, (°)	14	29	19.67	˗	˗	˗
Friction angle, (°)	17	31	23.67	31		˗