Test research and practice of project application indicates that apply thisachievement, the durable years of concrete in harbour engineering can reachdouble or triplicate compared to normal concrete structures, and guarantee atleast 50 years within heavy repair.
This paper continuously sets force and studies the problems on the improvement and development of the types of wharf structures of Tianjin Xingang Port in accordance with the engineering practice both in thesouthern and northern sides of the East Pier of Tianjin Yingang Port (The author's first paper related to this is published on "Harbour Engineering"1990 №. 3—Editor's Note).
During tendering for the water intake works for Zhangzhou Houshi Power Plant, the Second Engineering Company of the Fourth Harbour Engineering Bureau under CHEC and China Communications the Fourth Investigation ＆Design Institute for Navigational Engineering jointly made an alternative proposal to substitute for the original one, which was finally accepted as the formal construction scheme.
The necessity and the experimental method of the three-dimensional model test of harbour engineering with the irregular waves especially with the multidirectional waves are discussed through an example in this paper.
The revision of the Tentative Criteria for Acceptance of Concrete, its com pressive strength, in harbour engineering project is reported, the practicality of the new article is examined theoretically by equiprobability of defined indexes for acceptance/rejection. According to the concrete strength data of more than two hundred projects in harbour engineering, a comparison is made by statistic analysis and sampling characteristic curves for an appropriate practicality between the corresponding articles...
The revision of the Tentative Criteria for Acceptance of Concrete, its com pressive strength, in harbour engineering project is reported, the practicality of the new article is examined theoretically by equiprobability of defined indexes for acceptance/rejection. According to the concrete strength data of more than two hundred projects in harbour engineering, a comparison is made by statistic analysis and sampling characteristic curves for an appropriate practicality between the corresponding articles formulated in the National Standard (GBJ10-65), the Ministry Tentative Criterion(1978), and the revised Criterion in question. It is concluded that the revised article is appropriate to the present engineering practice, and moreover, the safety of engineering quality is better managed.
In this article the regular teriminal observations of 2-munite average wind velocity are converted to 10-munite ones by formulae for different regions with different values of air density and gravitational constants. The equation of wind pressure coefficient q as a function of elevation (h) obtained is q =0.0644 e-0.0001h. Nationwide charts for return period of wind pressure once in 10,20, 30, 60, and 100 years have been prepared for the benefit of various fields of engineering. These charts have been included...
In this article the regular teriminal observations of 2-munite average wind velocity are converted to 10-munite ones by formulae for different regions with different values of air density and gravitational constants. The equation of wind pressure coefficient q as a function of elevation (h) obtained is q =0.0644 e-0.0001h. Nationwide charts for return period of wind pressure once in 10,20, 30, 60, and 100 years have been prepared for the benefit of various fields of engineering. These charts have been included in the design codes for road, railway, electric power, telecommunication and harbour engineering.
At the sites of the harbour along the coast of China, especially in the vicinity of the mouth of Yellow River, Yangtze River and Pearl River, the soil strata often consist of recently deposited alluvial sediment. Therefore, under the foundations of harbour engineering structures there are always soft clays of considerable thickness. In this paper, the definition of soft clay is at first given according to the Chinese Foundation Code of Harbour Engineering. Then the physical and mechanical properties...
At the sites of the harbour along the coast of China, especially in the vicinity of the mouth of Yellow River, Yangtze River and Pearl River, the soil strata often consist of recently deposited alluvial sediment. Therefore, under the foundations of harbour engineering structures there are always soft clays of considerable thickness. In this paper, the definition of soft clay is at first given according to the Chinese Foundation Code of Harbour Engineering. Then the physical and mechanical properties of some soft clays at the sites of harbour along the coast of China are summarized. These soft clays are classified into four types according to their physico-mechanical characteristics: very soft clay (mud), soft (muddy) clay, soft (muddy) silty clay and very soft clay (mud) mixed with lumps of sand. It is seen from the collected data that the physico-mechanical characteristics for soft clay of the same type at various sites along the coast of China are very similar, which implies that these soft clays may be formed from the similar geological origin and in similar environmental condition. It is well known that the soft clay with such unfavourable engineering properties as high water content, low shear strength, high compressibility and low permeability, is a rather weak foundation for structures, hence there would be frequently some problems happened during the construction of structure on it. However, these problems more or less can be avoided, provided that the soft clay strata have been explored, tested and analyzed carefully and appropriate remedies are taken during construction. The problems usually encountered in the construction on soft clay are deformation and stability. The experiences and lessons learned on these respects in China are illustrated with 10 case histories of different types.
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