Page - 799 - in Book of Full Papers - Symposium Hydro Engineering

(2) The space ratio of collision (Sr). The space ratio means the ratio between the space area of collision and the original entity, because the entity of Collision gets different damage in the collision, this index can reflect influence extent between the two collisions. (3) The continuance of collision (Dc). The continuance means the overlap time of two entities in the space, which reflect the influence of working procedure, if the continuance is long, and it maybe influence the project schedule. (4) The duration ratio of collision (Ds). The duration ratio means the ratio between the continuance and the set time, and determine the adjustment will be necessary or not according to this index. 3.2. CONFLICTS IMPACT ANALYSIS After the above indicators are analysis, the collision impact to the project can divide into the following types. (1) Significant Effect. Significant effect usually caused by the breakdown of key equipment during construction. Key equipment cannot work normally, so the construction cannot carry out. (2) Great Effect. Great effect caused by some troubles of construction equipment due to collision, but it can be solved by analyzing and eliminating the troubles in a certain time, but it may be delay the project schedule more or less as the long solving time. (3) General Effect. Suspend the construction for a short time because of collision, but some simple processing can solve it, and it influences the project for a short time. (4) Slight Effect. Collision leads to the put-off of construction date of the following activities, but the normal construction can be assuring by simple adjustment or delay of the process, and it has no effect on the whole schedule. (5) No Effect. Although there is collision, the degree is subtle and it has no effect on construction entities and schedule. 3.3. COLLISION ADJUSTMENT MECHANISM The adjustment of collisions can operate by time and space. 1) Time adjustment mechanism The time adjustment is to change the running time parameters of the entities in the system to make the corresponding trajectories of the entities change to avoid the collision. As shown in Fig.2. 799