## 4 Empirical Examples
### Case Analysis
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Number** & **Activity Item** & **Precence** & **Duration Estimation** & **Activity Expected** & **Standard** & **Variance** \\  & **Relation** & **to, m, m/Dy** & **Duration** & **Deviation (Day)** & **Variance** \\ \hline
1 & Exoxation of dam abtument above water on two banks (above \(\bigtriangledown\)1901) & - & 170,230,200 & 225 & 15 & 225 \\
2 & Closure dike filling and foundation pit drainage & 1 & 40,55,70 & 55 & 5 & 25 \\  & Foundation pit excavation & 2 & 50,70,90 & 70 & 6.67 & 44.44 \\
3 & Foundation excavation of cutoff wall beside dam & 2 & 30,40,55 & 40.83 & 4.17 & 17.36 \\
4 & Foundation excavation of upstream and downstream enclosing wall & 1 & 40,55,60 & 53,33 & 3.33 & 11.11 \\
5 & Fulling construction of upstream and downstream deformation & 5 & 30,45,50 & 43,33 & 3.33 & 11.11 \\
7 & Silicon pouring of toe slab and foundation (below \(\bigtriangledown\)1901) & 3,46 & 8,15,25 & 15.50 & 2.83 & 8.03 \\
8 & Silicon pouring of octuff wall beside dam & 4 & 55,70,90 & 70.83 & 5.83 & 34.03 \\
9 & Filling construction of energy section of upstream dam (below \(\bigtriangledown\)1955) & 7.21 & 140,165,185 & 164.17 & 7.5 & 56.25 \\
10 & Filling construction of temporary section of downstream dam (below \(\bigtriangledown\)1955) & 8.9 & 130,150,185 & 152.5 & 9.17 & 84.03 \\
11 & Backfilling of gally at axis on net blank & 8.9 & 90,120,145 & 191.7 & 9.17 & 84.03 \\
12 & Masony beside dam & 8.9 & 455,495,560 & 499.17 & 17.5 & 306.25 \\
13 & Silicon pouring of panel of first stage & 8.9 & 45,60,80 & 60.83 & 5.83 & 34.03 \\
14 & Water stopping installation on surface & 13 & 45,60,75 & 60 & 5 & 25 \\
15 & Whole section filling from\(\bigtriangledown\)1955 to dam crest & 10,11 & 160,195,215 & 192.5 & 9.17 & 84.03 \\
16 & Filling of slope body in front of dam (below \(\bigtriangledown\)1940) & 10,11 & 100,120,145 & 120.83 & 7.5 & 56.25 \\
17 & Silicon pouring of panel of second stage & 14,156,32 & 75,90,115 & 91.67 & 6.67 & 44.44 \\
18 & Construction of parameter wall and road on dam crest & 12,17 & 85,120,150 & 119.17 & 10.83 & 117.36 \\
19 & Denolition of downstream deformation & 12,17 & 70,90,115 & 90.83 & 7.5 & 56.25 \\
20 & Filling and masonry on dam crest & 18,19 & 48,60,75 & 60.5 & 4.5 & 20.25 \\
21 & Bolt-concrete support of dam album on two & - & 280,300,400 & 333.33 & 20 & 400 \\
22 & Construction of debject system in this contract section & - & 135,165,195 & 165 & 10 & 100 \\
23 & Transformation of machining system of cushin material & - & 85,105,115 & 103.33 & 5 & 25 \\
24 & Borrow Area Planning and road construction in II zone of water ditch & - & 25,30,45 & 31.67 & 3.33 & 11.11 \\
25 & Peeling of gravel soil and strong decomposed rock & 24 & 100,120,145 & 120.83 & 7.5 & 56.25 \\
26 & Mining and blasting test of transition material & 25 & 12,15,20 & 15.33 & 1.33 & 1.78 \\
27 & Machining of test material in cushin & 22,23 & 35,45,50 & 44.17 & 2.5 & 6.25 \\
28 & Machining of cushin material in first stage & 27 & 48,60,80 & 61.33 & 5.33 & 28.44 \\
29 & Machining of cushin material in second stage & 28 & 105,135,160 & 134.17 & 9.17 & 84.03 \\
30 & Mining of transition material and cushin material & 26 & 195,240,280 & 239.17 & 14.17 & 200.69 \\
31 & Grouping test & 72,90,118 & 91.67 & 7.87 & 58.78 \\
32 & Grouting and pouring of toe slab on left and right banks & 31 & 300,300,400,420 & 360 & 20 & 400 \\ \hline \end{tabular} Note: in the table, a, m, b, respectively, indicate the optimistic completion time, the most likely completion time and the pessimistic completion time of the process. The value is obtained by modifying original data.  
\end{table} 
Table 1: Detall table of engineering construction process information. Step 2. Verify the bottlenecks  
As shown in Table 1 and Figure 2, the activities on the critical path are 1, 2, 3, 7, 9, 10, 15, 17, 18 and 20. The critical activities are ranked from large to small according to their variation or standard deviation,1,18,10 or 15,9,3 or 17, 2, 20, and 7.