珠江三角洲砂土液化特征与防御对策的研究
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摘要
研究目的:本文在阐述珠江三角洲自然地理背景的基础上,介绍其软土特性和砂土液化机理,针对近年地震活跃期较频繁发生地震、全球气候变暖导致海平面呈不断上升的态势,分析地震和地下水抬升将激活对砂土液化环境的影响,提出一些前瞻性的防御措施,为抗震加固改造工程等科学决策提供参考依据。研究结论:在过去100年南海海平面平均每年上升了2 mm,且有逐年增高的趋势。因相对海平面的上升幅度预测比较复杂,综合考虑理论海平面上升、海平面异常波动、洪潮水升幅、地形变化等因素,预测珠江三角洲地区沿海的海平面到2030年可能会上升22～33 cm,未来珠江三角洲地区海平面上升势必然引起地下水的抬升。
Research purposes: This paper describes the geographical background of the Pearl River Delta,introduces the soft soil characteristics and mechanisms of soil liquefaction,analyzes the impacts of the earthquake and raise of undergroundwater on the sandy soil liquefaction,being aimed at the situations that the earthquake happens more frequently and the sea level continuously raises caused by the global warming in recent years,and offers the some forward-looking defensive countermeasures for the purpose of providing the reference basis for seismic reinforcement projects. Research conclusions: In the past one hundred years,the sea level of the South China Sea raised by an annual average of 20mm,with the tendency of raising more and more year by year.As the prediction of the raise amplitude raise of the sea level is rather complicated,on consideration of the factors of the sea level raise in theory,the abnormal fluctuations of the sea level,the raise of the flood and tidewater and the topography change,it is predicted that the sea level along the Pearl River Delta region will raise to 22~33 cm by 2 030 and it will produce the raise of underground water in this area.
Research purposes: This paper describes the geographical background of the Pearl River Delta,introduces the soft soil characteristics and mechanisms of soil liquefaction,analyzes the impacts of the earthquake and raise of undergroundwater on the sandy soil liquefaction,being aimed at the situations that the earthquake happens more frequently and the sea level continuously raises caused by the global warming in recent years,and offers the some forward-looking defensive countermeasures for the purpose of providing the reference basis for seismic reinforcement projects. Research conclusions: In the past one hundred years,the sea level of the South China Sea raised by an annual average of 20mm,with the tendency of raising more and more year by year.As the prediction of the raise amplitude raise of the sea level is rather complicated,on consideration of the factors of the sea level raise in theory,the abnormal fluctuations of the sea level,the raise of the flood and tidewater and the topography change,it is predicted that the sea level along the Pearl River Delta region will raise to 22~33 cm by 2 030 and it will produce the raise of underground water in this area.
引文
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[2]程鉴基.覆盖型岩溶地基化学灌浆补强加固处理[J].铁道工程学报,1996(4):73-79.Cheng Jianji.Chemical Grouting Treatment onCovered Karst Foundation[J].Journal of RailwayEngineering Society,1996(4):73-79.
[3]陈伟坚,林慧常.海平面上开对珠江三角洲地区土层液化的影响[J].广东土木与建筑,2008(8):57-58.Chen Weijian,Lin Huichang.The Effect of Sea LevelRise to Soil Liquefaction[J].Guangdong ArchitectureCvil Engineering,2008(8):57-58.
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