基于渗透试验的深厚填石层止水帷幕比选

通过对深厚抛石填石层中采用高压旋喷注浆、常压注浆、灌注桩咬合桩形成的止水帷幕现场渗透试验结果的分析比较,确定了在临海深厚填石层中采用"冲孔灌注塑性混凝土桩+钢筋混凝土桩"咬合桩的止水方案能够满足基坑止水帷幕设计要求。基坑监测结果表明,"冲孔灌注塑性混凝土桩+钢筋混凝土桩"咬合桩止水效果良好,可靠度高,对类似大块抛石工程止水帷幕方案的选择具有较高的参考价值。     

青岛奥帆赛工程临海复杂地质条件的止水帷幕及地基处理技术

结合青岛奥运帆船赛基地建设的工程实例,分析了临海复杂地质条件下基坑开挖的技术难点,介绍了奥帆赛工程止水帷幕及地基处理的设计和施工技术,提出了利用旋喷桩止水帷幕与地基处理相结合解决临海复杂地质条件下深基坑施工难点的综合技术。     

临海抛石回填地质条件下的深基坑围护技术

临海抛石回填和海沙冲填复杂地层,具有高透水性的特点,尤其受潮汐影响地下水位变幅明显。青岛奥运会国际帆船中心地下车库工程,采用放坡开挖,坡面挂网喷射混凝土保护,高压旋喷注浆穿透抛石层形成止水帷幕等技术措施．有效地解决了4．5m高潮汐落差情况下的基坑止水问题。     

偏心潜孔锤套管跟进钻孔旋喷桩基坑止水施工技术

结合实际工程,详细介绍了在临海复杂地质条件下,采用偏心潜孔锤套管跟进钻孔旋喷桩基坑止水施工新技术.本工程所处位置为填海造陆区,场地水文地质、工程情况十分复杂,帷幕施工难成孔,孔壁坍塌和漏浆严重,并且受到潮汐的影响,采用偏心潜孔锤套管跟进钻孔+PVC管护壁旋喷桩施工及双排桩施工工艺,有效地达到了基坑止水效果并保证了工期.     

深水高潮位临江区域大型水利泵站排放口围堰快速施工及止水技术研究

水利工程排放口通常设置在临江、临海区域,为确保施工安全,采用围堰施工。临江、临海区域水位高、潮汐变化大、水上作业施工风险大、地质条件复杂、施工场地受限、排放口施工总体难度大。结合张家浜雨水泵站新建工程排放口及防汛墙围堰施工,通过围堰的设计优化,现场施工难点攻关,采用一种自驾式水上双排钢板桩围堰施工方法。针对围堰接缝接口易渗漏及流土等问题,提出相应接缝止水办法,确保排放口围堰施工期间的止水及安全,缩短工期和节约成本。     

复杂地质条件下的地基处理技术研究

我国东南沿江区域地质条件复杂,既有天然沉积的土层和岩石,又有回填的碎石、抛石等透水性很强的杂填土。其地下水位受江水影响,且基岩面起伏不平,因此基坑开挖无法采用普通的排降水方案,需采用与地质条件相适应的止水帷幕及地基处理技术。基于此,本文以实际工程案例为依据,通过分析在复杂地质条件下基础工程遇到的技术难题,提出复杂地质条件下的地基处理技术,研究结果对建筑业具有重要意义。     

邻海复杂地质条件下某深基坑工程的应用

介绍了某临海城市一深大基坑工程的设计方案与工程实践。首先根据基坑的工程地质条件,确定支护方案采用钻孔桩和旋喷桩组合支护形成止水帷暮措施．施工阶段对基坑的监测结果表明,该工程采用钻孔桩和旋喷桩组合支护与止水措施达到了安全可靠、经济合理的目的,可以为临海复杂地质条件下．类似工程提供一定的借鉴作用。     

临海复杂地质条件高压旋喷桩止水帷幕应用

针对临海地下水位高且随潮汐变化的复杂地质条件的特点,通过对深层搅拌法成桩和高压喷射注浆成桩及螺旋钻机成桩方案的技术经济比较后,采用高压旋喷注浆技术穿透抛石层,以解决海水大潮汐落差情况下的基坑止水问题,取得了理想效果。     

海滨深厚填石层止水帷幕咬合桩施工技术

以深圳蛇口邮轮中心基坑为例,通过对深厚抛石填石层中采用高压旋喷注浆、常压注浆、灌注桩咬合桩形成的止水帷幕进行现场渗透试验结果分析比较,确定在临海深厚填石层中采用"冲孔灌注塑性混凝土桩+钢筋混凝土桩"咬合桩止水方案能满足基坑止水帷幕设计要求。针对深厚填石层、地下水与海水联通的特殊情况,简要介绍了施工关键技术。监测和检测结果表明,"冲孔灌注塑性混凝土桩+钢筋混凝土桩"咬合桩止水效果良好,可靠度高,对类似工程具有较高的参考价值。     

复杂地质条件下地下工程施工技术的研究与应用

针对青岛土层分布不均匀、杂填土、岩土结合、持力层起伏较大、邻海等复杂地质特点,结合一些大型工程实例,以整体论的方法综合分析了内放坡结合止水帷幕、桩锚结合止水帷幕和土钉结合止水帷幕等基坑支护方案,研究了保证岩土结合部位稳定的设计与构造、基坑开挖的控制爆破技术及复杂地质条件下锚杆施工等关键技术,并提出复杂地质条件下的多种技术先进、经济合理的方案和选择原则,以及包括基坑工程、桩基础、地基处理、混凝土结构工程在内的多项创新技术.     

Observations of turbidity in the Thames Estuary,United Kingdom

Two years of data of water level, salinity and turbidity have been analysed to understand the response of the estuarine turbidity maximum in the Thames to variations in tidal range and freshwater flow. We show the increase in turbidity in spring, together with a sudden decrease in autumn after fluvial flooding. In order to try to understand the mechanisms, we also present data from individual tides. During dry periods, there is a period of slack water around high tide when settling occurs. There is little equivalent settling at low tide, nor is there any significant settling during wet weather periods, pointing to the importance of tidal asymmetry at certain times of year. We also present an empirical relationship between peak tidal water level and turbidity during flood tides, which clearly shows the greater landward transport of sediment under spring tides, although this is moderated by the availability of erodible material.     

Assessing the Joint Probability of Fluvial and Tidal Floods in the River Roding

Water levels in the lower reaches of most rivers are controlled by the interaction of fluvial flows and tides. Assessment of the risk of over-bank inundation therefore requires an estimation of the probability of experiencing combinations of river floods and high tides and calculation of the water levels resulting from their interaction. This may be achieved by numerical integration of the marginal probability distributions of river floods and sea-levels, but this is complex mathematically and requires explicit knowledge of the correlation structure. In this paper a solution is developed for risk assessment in the lower River Roding, by reconstructing the historical water levels from river flow and tidal records using a hydraulic model. The resulting water-level series is then analysed statistically to estimate the probability that certain critical levels will be exceeded. The model allows for operation of the River Roding's flood-protection barrier and for the effects of a general rise in sea level.     

GPS在湖区航标定位中的应用实践

针对在测量实践中经常碰到湖区水面宽、风浪大的情况，通过实例详细介绍了利用GPS系统在湖区定位的方法，通过采取合理有效的方法，解决了湖区航标定位的困难问题。     

A PLASTIC TIDE: MINING FLOATING PLASTIC WASTE THROUGH LANDSCAPE PROCESSES

The United Nations estimates that 40% of the 300 million tons of plastic produced each year are disposed of within a year. At that rate there could be more plastic than fish in the sea by 2050. Developing countries such as China, Indonesia, the Philippines, Thailand, and Vietnam contribute up to 60% of the plastics waste drifting in the world’s sea. Much of the plastic is trapped in the South China Sea for two years before drifting out to the Pacific Ocean. The plastic problem has increased as Chinese recyclers have relocated to Southeast Asia and began importing waste from all over the world. The imported plastics are cheap and clean, outcompeting the dirty plastics collected locally from the tides. The recycled plastic price dropped to unprecedented level in 2017, discouraging plastic scavenging by locals. This thesis empowers the waste pickers by designing structures that incentivize plastic recycling. The thesis proposes that the plastic tides can be mined, shredded, cleaned, dried, baked, and cooled in an efficient and holistic landscape system.     

Risk assessment and decision-making for residential housing adapting to increasing storm-tide inundation due to sea-level rise in South East Queensland,Australia

The exposures and risks of coastal built as well as natural assets to storm-tide inundation are expected to be more pronounced as a result of the reduced recurrence interval or the increased occurrence frequency of storm tides in Australia due to sea-level rise. This study investigates the distributions of direct damage losses and adaptation benefits for residential buildings considering uncertainties of storm tides under projected sea-level rises in South East Queensland, one of the fastest-growing regions in Australia in the last two decades. The study subsequently indicates that ‘deterministic decision-making’ based on an individual hazard or scenario could be fundamentally flawed for coastal planning and adaptation as a result of uncertain natures in coastal hazards under changing climate. The developed knowledge can eventually facilitate better decision-making processes for adapting coastal residential buildings to future climate change under considerable uncertainties. It is also found that constructing new buildings with higher floor heights is a relatively inexpensive but also a highly effective approach insensitive to uncertainties for reducing future damage losses of storm-tide inundation.     

EFFECT ON ESTUARINE FINE-SEDIMENT TRANSPORT OF INTERMITTENT PUMP DISCHARGE AT PAGHAM HARBOUR, WEST SUSSEX

Field investigations were undertaken to identify the mechanisms of fine-sediment transport at a landward limit of Pagham Harbour. Which is a semi-enclosed natural harbour in West Sussex, UK. Measurements of water level, velocity, salinity and turbidity were made during three tidal cycles between June and August 2002. Near-bed measurements revealed that, for spring tides, the most significant transport occurs during the flood tide, with smaller turbidity peaks recorded at times of intermittent pumped discharges at low water. Vertical profiling revealed that the timing of these discharges acts as a control on the landward transport of fine sediment by increasing salinity stratification. The resulting graphs show that, while increased near-bed velocity leads to increased turbidity and sediment transport, the degree of vertical salinity gradient is also linked with landward transport of fine sediment. These results help to explain the role of tides and fresh-water flow in controlling the transport of fine sediment in natural harbours, emphasising the importance of taking stratification into account when using 2-D depth-averaged predictive numerical models.     

潮汐及环境负荷对GPS高程影响的研究

简要介绍了3类潮汐、两类环境负荷模型改正,通过某测区实测数据讨论了中距离范围潮汐和环境负荷对GPS高程精度的影响。     

建筑创作的回归

当今建筑创作的方式,潮流,种类和趋势缤纷繁多,让人疑惑。我们应该从这种混乱的形式中找到一条回归的道路,来指导我们去更好的完成建筑设计。而建筑的地域性理论为建筑创作的回归奠定了一条道路。     

四面环水复杂地层岛屿基坑支护施工技术

某基坑项目临近珠江,动水作用影响大,施工难度高,文中针对工程特点,采用搅拌桩重力墙支护结构外侧增设Ⅳ型钢板桩的方案,以减少珠江流水及潮汐对搅拌桩成桩质量的影响,以达到确保工程质量的目的。     

钢板桩围堰在潮汐河流中的设计和施工

针对东莞市某输水工程位于潮汐河流的情况,采用了钢板桩围堰方案施工,文中对钢板围堰的设计、施工进行了分析,提出了围堰施工中应注意的事项,并比较了水中围堰与土中基坑设计的不同之处,为其他类似工程提供参考、借鉴。