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... the excavation design intent. Recommendations by the engineer enabled the contractor to improve blasting designs, reduce blast damage, and improve the quality of rock support systems. With careful surveillance and instrumentation monitoring the revised excavations were completed without further incident. 1...

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... 1. INTRODUCTION The existing North Pylon and North Anchorage Housing of the Golden Gate Bridge, located in Marin County, California, are currently undergoing a seismic retrofit (Figure 1). Shimmick Obayashi Joint Venture (SOJV) is the contractor performing the retrofit work. The North Anchorage...

... on the design and cost of projects. This study stems from a comparison of geological mappings during a shaft-sinking project. Two geotechnical engineering teams, assigned by the project design engineer (Engineer) and the contractor (Contractor) conducted the geological mapping. The rock mass classification data...

... in tunneling practice. The Tunneling Game Model (TGM) is a two-person cooperative game which is formulated as a bargaining situation. The two players, the owner and the contractor, have the opportunity to collaboratefor mutual benefit. Two utility functions are proposed to determine the psychological...

... caused from the rockslope. The work involved rock excavation by production blasting, rock reinforcement with dowels and rock bolts and rockfall mitigation using wire mesh drape. A contractor?s access road was constructed across the upper rock face about 85 feet above the shoulder of the highway...

... a maximum hydrostatic head of 244 meters with excess water head to be relieved as needed. The design changes for the segments had to be compatible with the Contractors existing TBM segment erection system. Additionally, a ground water monitoring program was developed to assure the buildup of hydrostatic...

... rock mass geology intervention pipe grout phyllitic rock displacement friction angle diameter contractor landslide micropile Rock Mechanics for Indust Amadei, Kranz, Scott & Smeallie (eds) ¸ 1999 Balkema, Rotterdam, ISBN 90 5809 052 3 Stabilization of Candide landslide A. Mammino & I.G...

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... bearing on the primary support. The A. R. Davis Water Transmission Project (Davis WTP) included two contracts involving TBM tunneling in the Glen Rose and Walnut Formations. The Phase VI contractor used one of the Lovat TBMs previously used on the OCWI Section IV contract. The Davis WTP Phase VII contract...

... metre, including additional work and preliminaries. The values in brackets are percentages of the total cost. TITAN ROADHEADER 2997 m advanced in 1416 shifts Contractor Materials Machine Parts and Tools Machine Total TOTAL COST/m 456 (38.7%) 666 (56.6%) 19 (1.6%) 37 (3.1%) 1178 (100%) ROBBINS TBM 4821 m...

... scale, well instrumented tests that have been constructed at the Waste Isolation Pilot Plant (WIPP) in southeastern New Mexico. As a precursor to the TSI tests, a ventilation drift (Room D) was mined, drilled and instrumented. This room provided the contractor an excellent area to practice controlled...

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... excessively may be reduced too far in grain size, below an acceptable limit and, in the extreme, wasted. Upstream Oil & Gas particle velocity constraint strength presplit hole rock product drilling operation design line category excavation contractor limitation restriction metals...