Influence Scope on the Existing Roads of a Certain Tunnel Underpass by Blasting Construction
Daohong Xia,
Xianghui Deng,
Rui Wang,
Yaoyao Meng
Issue:
Volume 4, Issue 3, September 2018
Pages:
50-58
Received:
20 July 2018
Accepted:
5 September 2018
Published:
3 January 2019
Abstract: In tunnel construction, blasting vibration has great influence on buildings and roads nearby. It is particularly important to discuss the influence scope of blasting vibration. This article focuses on the blasting vibration influence scope of the existing roads nearby through the blasting vibration velocity in-situ monitoring of key points with the case of blasting construction of Baohan highway project. The conclusions are as follows: the dominant frequency of blasting vibration is between 10-50Hz during the monitoring of the tunnel blasting construction, so that the existing roads nearby will not resonate with blasting. Based on the results of this in-situ monitoring, for the general blasting construction, the vertical vibration velocity should be principally monitored because it is higher than the radial and tangential vibration velocity and it is significantly destructive to the buildings. To ensure the safety of structures and transportation of the existing roads, the blasting vibration velocity of key points is supposed to be 2.0cm/s for existing roads of the shallow-buried tunnel underpass with large cross-section and soft surrounding rock. Furthermore, the data shows that the influence scope of blasting vibration wave to the existing roads is about 30m, which is consistent with theoretical calculation results. Therefore, these results can provide references to the general tunnel constructions.
Abstract: In tunnel construction, blasting vibration has great influence on buildings and roads nearby. It is particularly important to discuss the influence scope of blasting vibration. This article focuses on the blasting vibration influence scope of the existing roads nearby through the blasting vibration velocity in-situ monitoring of key points with the...
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Post Implementation Evaluation of Lahore - Sheikhupura - Faisalabad Dual Carriageway - A Built Operate Transfer (BOT) Project
Anwaar Ahmed,
Sandeerah Choudhary,
Muhammad Irfan
Issue:
Volume 4, Issue 3, September 2018
Pages:
59-64
Received:
4 January 2019
Published:
5 January 2019
Abstract: The transportation systems generally constitute the largest public-sector investment by any society. Despite of funding limitations, highway agencies continue striving to develop road network to meet needs of the society. In order to ensure optimal utilization of public money, there is a dire need of best project evaluation practices and monitoring of the expected impacts of highway investment decisions. Present study focused on post implementation evaluation of Lahore-Sheikhupura-Faisalabad Dual Carriageway, a 4-lane divided highway 115 Kilometer long that was constructed in 2006 through Build-Operate-Transfer (BOT) financing with a concession period of 22 years. For post-implementation evaluation five performance criteria were considered: safety, vehicle operating cost, fuel cost, lifecycle agency maintenance and operations cost, and lifecycle toll collection. Post-implementation evaluation was carried out using highway maintenance and rehabilitation strategies proposed by facility operator (concessioner). Present worth (2007 constant US$) of travel time, safety and fuel saving was found to be $US 429.290, -1.790, 65.080 Million respectively. Using facility operator’s maintenance and rehabilitation strategy total maintenance and operations cost was found to be $US 234.442 Million (2007 constant US$). Also, present worth of toll collection was estimated as $US 131.410 Million (2007 constant US$). Positive net present value revealed that project is economically viable for society. Also, methodology used in present study can be used by highway agencies for carrying out post-construction evaluation of their projects.
Abstract: The transportation systems generally constitute the largest public-sector investment by any society. Despite of funding limitations, highway agencies continue striving to develop road network to meet needs of the society. In order to ensure optimal utilization of public money, there is a dire need of best project evaluation practices and monitoring...
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