Assessment of the Performance of the Ground and Facilities at Wellington Port during Three Earthquakes

三次地震期间惠灵顿港地面和设施的性能评估

基本信息

批准号：
1956248
负责人：
Jonathan Bray
金额：
$ 48.04万
依托单位：
University of California-Berkeley
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-04-01 至 2025-03-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1956248&HistoricalAwards=false
关键词：
Assessment Performance Ground Facilities Wellington

项目摘要

Ports are critical economic assets and their resilience is necessary for the security of our Nation. Many ports are in seismically active areas, which could be damaged and lose operational readiness after an earthquake. Research on liquefaction effects on ports is vitally important in the U.S. where the effects of liquefaction like those observed at Wellington Port, New Zealand after the 2016 Kaikoura earthquake could kill people and cripple commerce. As widely used liquefaction evaluation procedures are largely empirically based, it is crucial that well-documented, insightful liquefaction case histories be investigated thoroughly. There remain several important issues to explore such as gravel and silt liquefaction and their effects on port facilities. The rich Wellington Port dataset provides an exceptional opportunity to advance the understanding of soil liquefaction effects, to develop more robust simplified procedures, and to evaluate the capabilities of advanced models and simulations to discern the seismic performance of critical port facilities. Wellington Port provides the opportunity for an integrated study of port facilities at a degree of detail and level of complexity that could not be performed in the U.S. due to security restrictions. The similarity of its liquefaction hazards and infrastructure with those in the U.S. means that the research findings will be directly transferable to the U.S. Lessons learned will be incorporated in recommendations for assessing the effects of liquefaction on port facilities built on reclaimed land. Simplified liquefaction evaluation procedures provide useful insights, but they cannot explain the different levels of liquefaction-induced ground and facility damage during the 2016 Kaikoura earthquake at Wellington Port. The effects of this event and the less damaging 2013 Cook Strait and Lake Grassmere earthquakes warrant further study. Performance-based earthquake engineering requires analytical tools that can discern varying levels of seismic performance. These earthquakes, with their excellent ground motion recordings, their well-documented performance of port facilities, and subsequent fieldwork to characterize the soil conditions, which includes gravel that liquefied, provide an exceptional opportunity to advance understanding. Documenting and learning from field case histories of gravel liquefaction are especially important, as few of these cases exist. The research goals are to: a) investigate liquefaction triggering of the Thorndon fill with up to 70% gravel-size material; b) investigate the lack of liquefaction manifestation at silty soil sites at the port; c) develop a new probabilistic method for estimating post-liquefaction volumetric settlement; d) develop and back-analyze case histories of port facilities undergoing different levels of liquefaction-induced ground failure; and e) transfer knowledge. These goals are realized through a research plan that: (1) develops and interprets well-documented case histories of ground performance for three soil conditions at the port: gravel fill, silty soil, and sand fill; (2) combines the Port’s lidar data with other case history data to develop a new probabilistic method for estimating volumetric reconsolidation ground settlement, which assesses uncertainty; (3) develops and back-analyzes seven well-documented case histories of port facility performance to evaluate the importance of soil-structure-interaction effects for wharves and buildings; and (4) performs outreach activities and develops guidance. The excellent case histories of ground and structural performance at Wellington Port provide an exceptional opportunity to develop new methods that capture the observed differing levels of performance during the earthquakes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

港口是关键的经济资产，其弹性对于我们国家的安全必不可少。许多港口都处于地震活跃地区，地震后可能会受到损害并失去操作准备。在美国，对液化影响的研究至关重要，在美国，液化的影响像2016年Kaikoura地震后在新西兰惠灵顿港口所观察到的那样，可以杀死人们和致命的贸易。由于广泛使用的液化评估程序在很大程度上是紧迫的，因此对充分记录的，有见地的液化病史进行了彻底研究至关重要。仍然有几个重要问题需要探索，例如重力和淤泥液化及其对港口设施的影响。丰富的惠灵顿港口数据集提供了一个极好的机会，以提高对土壤液化效应的理解，开发更强大的简化程序，并评估高级模型和模拟的能力，以辨别关键端口设施的地震性能。惠灵顿港口为对港口设施的综合研究提供了一个机会，并以一定程度的详细程度和复杂程度，由于安全限制，在美国无法执行。其液化危害和基础设施与美国的相似性意味着，将直接将研究结果直接转移到美国的经验教训中，以评估液化对在再生土地上建造的港口设施的影响。简化的液化评估程序提供了有用的见解，但他们无法解释惠灵顿港口2016年Kaikoura地震期间液化诱导的地面和设施损害的不同水平。该事件的影响以及2013年库克海峡和格拉斯米尔湖地震的破坏性较小，需要进一步研究。基于绩效的地震工程需要分析工具，以辨别不同水平的地震性能。这些地震，具有出色的地面运动记录，据据可查的港口设施的性能以及随后的野外作业，以表征土壤条件，其中包括液化的重力，为提高理解提供了极好的机会。从现场案例史的记录和学习重力液化史特别重要，因为这些案例很少。研究目标是：a）调查索恩登填充液化液的液化，最多70％的重力大小材料； b）研究港口的粉质土壤部位缺乏液化表现； c）开发一种新的概率方法，用于估计Liquefaction容量设置； d）开发和反分析端口设施的病史，经历了不同水平的液化引起的地面故障；和e）转移知识。通过研究计划实现了目标：（1）在港口的三种土壤条件下开发和解释有据可查的地面性能史：重力填充，粉质土壤和沙子填充；（2）将港口的LiDAR数据与其他案例历史数据结合起来，以开发一种新的概率方法来估计体积重新固定地面设置，从而评估不确定性；（3）开发和背分析港口设施绩效的七个有据可查的病史，以评估土壤结构互动效果对建筑物和建筑物的重要性；（4）进行外展活动和发展指导。惠灵顿港口的地面和结构性表现的出色案例历史为开发新方法提供了一个非凡的机会，以捕捉地震期间观察到的不同水平的表现。该奖项反映了NSF的法定任务，并认为值得通过基金会的知识分子优点和更广泛的影响审查标准通过评估来获得支持。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Post-Liquefaction Free-Field Ground Settlement Case Histories

液化后自由场地面沉降案例历史

DOI：
发表时间：
2023
期刊：
International Journal of Geoengineering Case Histories
影响因子：
0
作者：
Olaya, Franklin R.;Bray, Jonathan D.
通讯作者：
Bray, Jonathan D.

Sensitivity of CPT-based liquefaction assessment to sleeve friction depth correction

基于 CPT 的液化评估对套筒摩擦深度修正的敏感性

DOI：
发表时间：
2022
期刊：
Proc. 20th International Conference on Soil Mechanics and Geotechnical Engineering
影响因子：
0
作者：
Dhakal, R.;Bray, J.D.;Cubrinovski, M.
通讯作者：
Cubrinovski, M.

Strain Potential of Liquefied Soil

液化土的应变势