Geotechnical Engineering Principles: Soil Mechanics Insights

Why in soft clays should be done undrained cond? Clays soils present a very low permeability, so water pres disipation takes a lot of time, so failure will be reached in undrain conditions. It contracts when shear stresses are apllyed. Undrain resist is much smaller than draine, and can be aprox: Cu=0,25+sicma'v and for triax cu=q/2 b)How the second consol coef can be estimated?Settlement can be reduced  by preloading the soil with a load equal or higher to the one it will withstand after construc. 2) Which parameters or fundamental control the seismic ... Shear modulus G and damping (la de compu rara), which are turned relationed with porosity, relatv densi y wave speed 's'. Shear modu is the ratio of shear stres and deformation . Damping mesures capacity to dissipate energy. The more shear deformati, lower G, but more damping more dicipate energy (grafices q em parlat) 3)Mü+ku-Qp=fu (mec)  Qt.ú+Sp(punt sobre p)+Hp=fp(hidr) Q(acopl) H(perm) S(compr) p(punt) deri tempor pres por etapas: ü=0 (conso) (din no dren) (Kij=0) (estat dren) tots els de punt sobre=0  5) calcul: sicm vert = gamma s * z; sicma'v=sicma ver - gama wat(10) * z; sic'hor=sic'vert *ko ; camb = (1/3)*(sic'ver+2*sic'h) i q'=sicm'ver-sicm'hor; ocr=sic'max/sic'current; 2 casos Ai B: (max p' o kp)/kp kp(valor testos)

For progressive failure to occur? Mater must be britlle and loading strains non unif , the catastrofic consecu aznacollar.. large pore pressures in the foundation, The BBM is a mod whose hard is con.. predicted strains in BBm for some stress path are dependents and the model is capable of predicting plastic defor along k0 stress paths at const suction ;  dens=pM/RT  relativ humidyt is defi= actual mass vapor divided  by mass of vapor at satur safety factor= SF=Wx/Endn-Etdt  Failures of cutting.. the slow recovery of pore pressures reduced by excavation; SF Retaining wall SF=Wtandelta/E  Consider the reduc strength method for aretaining walla ocfa;  if OCFA > SCFA it means that overturning is more probable than sliding. This is because friction angle is reduced (strength reduct method) from the real value, the ocfa is reached first. 

Discontinuitis suchs as joints and faults are foten pres .. Post rupture strength in joints and residual in faults  In clays the degree of britlenes Overconsolidation ratio, plasticity index and water content