摘要
在波浪作用下,导堤下近表层的②2-0土极易软化,曾使工程严重受阻。为此采用排水板和基床预压的抗软化加固方案,对方案进行现场试验验证。为在远离岸边且台风时监测,首次采用多个固定测斜仪的连续沉降板法监测沉降,精度达到0.001 mm。首次将自动监测仪器长期放入海底。从监测一年多的沉降和孔隙水压力曲线看,不仅规律性好,无异常点,而且在定量上准确、稳定。监测期间经几次台风袭击,未发生突降。试验验证了抗软化方案是非常成功的。
Soil in Stratum 2-0 close to the surface layer under a levee is extremely prone to softening under the action of wave loads, hence impeding grievously the progress of the works. After the construction scheme against softening of subsoil with installation of prefabricated drains and riprapping as the pre-loads to resist subsoil softening was proposed, field expeximents were made to verify the construction scheme. To execute offshore monitoring and measurements, and those in typhoon periods, it was the first time that a method using multiple stationary inclinometers fixed on hinged continuous settlement plates was adopted and the accuracy of the measurements was 0.001 ram. It was also the first time that all the automatic monitoring and measuring instruments were installed on the seabed over a long period of time. It can be seen from the settlement curves and the curves of pore water pressure measured for mere than a year that the curves showed good regularity with no abnormal points and were also quantitatively accurate and stable. During the field measurements, though the site where the experiments were conducted was several times attacked by typhoons, no sudden and rapid subsidence occurred. The experiments proved that the scheme for antisoftening was very successful.
出处
《海洋工程》
CSCD
北大核心
2007年第2期64-71,共8页
The Ocean Engineering
基金
交通部部级研究与开发资助项目(2003-329-C01-010)
关键词
抗软化加固
现场试验
沉降测量
水下自动监测
长江口
improvement of subsoil against softening
field experiment
subsidence measurement
automatic underwater measurement
the Yangtze River estuary
