Established on October 18th of 2002, the School of Software Engineering of Beijing University of Posts and Telecommunications is one of the 35 national model schools of software engineering approved by the Ministry of...Established on October 18th of 2002, the School of Software Engineering of Beijing University of Posts and Telecommunications is one of the 35 national model schools of software engineering approved by the Ministry of Education and the National Committee of Development and Reform. According to current requirements and international trends, the school has set up its objective as to educate students with multi-level, practical, and composition talents. To this end,展开更多
High-capacity, post-tensioned anchors have found wide-spread use, originally in initial dam design and construction, and more recently in the strengthening and rehabilitation of concrete dams to meet modern design and...High-capacity, post-tensioned anchors have found wide-spread use, originally in initial dam design and construction, and more recently in the strengthening and rehabilitation of concrete dams to meet modern design and safety standards. Despite the advances that have been made in rock mechanics and rock engineering during the last 80 years in which post-tensioned anchors have been used in dam engineering, some aspects of the rock engineering design of high-capacity rock anchors for dams have changed relatively little over the last 30 or 40 years. This applies, in particular, to the calculations usually carried out to establish the grouted embedment lengths required for deep, post-tensioned anchors.These calculations usually make simpli fi ed assumptions about the distribution and values of rock e grout interface shear strengths, the shape of the volume of rock likely to be involved in uplift failure under the in fl uence of a system of post-tensioned anchors, and the mechanism of that failure. The resulting designs are generally conservative. It is concluded that these aspects of the rock engineering design of large, posttensioned rock anchors for dams can be significantly improved by making greater use of modern,comprehensive, numerical analyses in conjunction with three-dimensional(3D) models of the rock mass structure, realistic rock and rock mass properties, and the results of prototype anchor tests in the rock mass concerned.展开更多
文摘Established on October 18th of 2002, the School of Software Engineering of Beijing University of Posts and Telecommunications is one of the 35 national model schools of software engineering approved by the Ministry of Education and the National Committee of Development and Reform. According to current requirements and international trends, the school has set up its objective as to educate students with multi-level, practical, and composition talents. To this end,
文摘High-capacity, post-tensioned anchors have found wide-spread use, originally in initial dam design and construction, and more recently in the strengthening and rehabilitation of concrete dams to meet modern design and safety standards. Despite the advances that have been made in rock mechanics and rock engineering during the last 80 years in which post-tensioned anchors have been used in dam engineering, some aspects of the rock engineering design of high-capacity rock anchors for dams have changed relatively little over the last 30 or 40 years. This applies, in particular, to the calculations usually carried out to establish the grouted embedment lengths required for deep, post-tensioned anchors.These calculations usually make simpli fi ed assumptions about the distribution and values of rock e grout interface shear strengths, the shape of the volume of rock likely to be involved in uplift failure under the in fl uence of a system of post-tensioned anchors, and the mechanism of that failure. The resulting designs are generally conservative. It is concluded that these aspects of the rock engineering design of large, posttensioned rock anchors for dams can be significantly improved by making greater use of modern,comprehensive, numerical analyses in conjunction with three-dimensional(3D) models of the rock mass structure, realistic rock and rock mass properties, and the results of prototype anchor tests in the rock mass concerned.
