A STUDY OF THE RECENT TECTONIC ACTIVITY IN JIANGSUSHANDONG-ANHUI AREA

In this paper two vertical deformation maps have been drawn, based on the accurate leveling data of 1950-1980, in Jiangsu-Shandong-Anhui area. Along combining with neotectonic, geological basis and crustal deformation data, an analysis of the recent tectonic activity in the studied area has been made,and some conclusions have been drawn as follows: (1) The Tancheng-Lujiang fault zone across the studied area is the key tectonic element in recent tectonic activity, and the crustal deform...更多ation is controlled by the fault zone. (2) A study of the two deformation maps shows that the section of the Tancheng-Lujiang fault zone in this area is a creeping section, but both ends of the section are locked parts. The stress concentration ought to be accumulated in these parts. (3) Difference between the two maps suggests that the activity character of the fault zone is right lateral slip during 1950 to 1970, but reverse activity has occurred since 1982 to 1983. This suggests that the most intense earthquake in East 还原 【Abstract】 In this paper two vertical deformation maps have been drawn, based on the accurate leveling data of 1950-1980, in Jiangsu-Shandong-Anhui area. Along combining with neotectonic, geological basis and crustal deformation data, an analysis of the recent tectonic activity in the studied area has been made,and some conclusions have been drawn as follows: (1) The Tancheng-Lujiang fault zone across the studied area is the key tectonic element in recent tectonic activity, and the crustal deformation is controlled by the fault zone. (2) A study of the two deformation maps shows that the section of the Tancheng-Lujiang fault zone in this area is a creeping section, but both ends of the section are locked parts. The stress concentration ought to be accumulated in these parts. (3) Difference between the two maps suggests that the activity character of the fault zone is right lateral slip during 1950 to 1970, but reverse activity has occurred since 1982 to 1983. This suggests that the most intense     

天津市新建的具有独特风格的桥梁

天津市近几年来新建了多座具有独特风格和景观效果的新型桥梁,本文主要介绍其中的三座斜拉桥、三座拱桥、一座自锚式悬索桥和一座集交通、观光、游览为一体的巨型摩天轮桥梁,以及三座经装修改建、使旧桥换新颜的实例。     

Modelling the drained response of bucket foundations for offshore wind turbines under general monotonic and cyclic loading

The response of bucket foundations on sand subjected to planar monotonic and cyclic loading is investigated in the paper. Thirteen monotonic and cyclic laboratory tests on a skirted footing model having a 0.3 m diameter and embedment ratio equal to 1 are presented. The loading regime reproduces the typical conditions of offshore wind turbines: very large cyclic overturning moment, large cyclic horizontal load and comparatively little, self-weight induced, vertical load. The experimental soil-foundation response is interpreted within the macro-element approach, using an existing analytical model, suitably modified to accommodate the footing embedment and the application of cyclic load. Details of the proposed model are provided together with evidences of its ability to reproduce the essential features of the experimentally observed behaviour. The results of the study aim at increasing the confidence in the use of the macro-element approach to predict the response of bucket foundations for offshore wind turbines, notably as the long-term accumulated displacements are concerned.     

基于FVCOM的长江口预选倾倒区抛泥扩散数值模拟

2019年以来,长江口海域年疏浚总量约为7 000×104 m3,现有的7座吹泥站停用后,长江口倾倒区容量仅剩约3 000×104 m3,疏浚物处置缺口约为4 000×104 m3,需及时开展海洋倾倒区选划工作。通过FVCOM （Finite Volume Community Ocean Model）数值模型对预选倾倒区进行抛泥扩散模拟,并分析其影响。根据长江口航道管理局所统计的疏浚船只,结合实际情况,选定12 000 m3舱容作为代表船只进行模拟。模拟结果显示,抛泥悬浮物主要在倾倒区周围呈螺旋状扩散,从扩散范围来看,4个预选倾倒区抛泥时,其10 mg/L增量包络线均不会显著影响到附近主航道及周边环境敏感区,其中预选倾倒区D扩散影响范围最大,C次之,A和B扩散影响范围最小。从动力角度来看,长江口深水航道北侧两个预选倾倒区（A和B）倾倒扩散时,对南侧深水航道造成回淤的概率更大,深水航道南侧水动力条件优于北侧。综合抛泥扩散影响范围和动力条件来看,预选倾倒区C位置最佳。