Physics Lab Report - 717 Words

(g) The steps (c) and (d) were repeated to obtain new values of Ã…Å"e and then step (e) to obtain a new curve III. The process was repeated till reasonably accurate values of F and P were obtained. However, it was seen that the third trial did give sufficiently accurate values, for all practical purposes. To obtain the safe pile capacity, a factor of safety of 2 on the ultimate skin friction resistance and 2.5 on the ultimate point bearing resistance was applied. 1.3.6 The same graph was also solved using the analytical method. From straight line portion of curve (see Fig. 2) the value of constant from the equation (eq. 2.1) was computed. í‘š = Δs−(ΔT AE)L AE (eq. 2.1) Where m = a constant; Δs = change in total elastic settlement of pile†¦show more content†¦The modified formula for finding out the constant value of m in the formula is í‘š=ΔsΔT (eq 3.1) Where m= a constant ΔS = Change in settlement in the linear portion of the curve ΔT= Change in load in the same interval as taken for the settlement change S = mT (eq 3.2) Where S = corrected settlement in cm, and T = total load on pile top in kgf. Knowing values of m and S compute skin friction and point bearing by solving simultaneous equation (eq. 3.3) and (eq. 3.4) T = P + F (eq 3.3) 푆=mP+ (T−F2)LAE (eq. 3.4) 1.4 Project Summary 1.4.1 Overall View of the Project The detailed analyses of graphical method and analytical method gave the following conclusions: 1. The graphical method can only be applied to cases where the plot the Elastic Compression of Subgrade vs The Applied Load is comparable to the standard curve where the curve has a parabolic part in the beginning which then becomes linear. 2. Graphical method and analytical as per IS code-2911 can be used only in the case of pile socketed in soft rock. 3. For piles resting on hard rock, the graphical method yields unexpected results as the plot between Elastic Compression of Subgrade vs. The Applied Load was erroneous. 4. Analytical method as given in IS Code-2911 when applied to piles resting on hard rock gives the value of an intermediate constant â€Å"m† as negative which renders the rest of the method meaningless. 5. The corrected analytical methodShow MoreRelatedPhysics Lab Report1059 Words   |  5 PagesGrade 11 physics: SPH3U1-01 | Physics Lab Report | Specific Heat Capacity of Brass | | Jin Jin Shi | 2012/12/6 | Instructor: Mr. Nailer | I. 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