塑料排水板在海岸工程水下软基处理中的应用

通过综合分析工程建设区域的自然条件和地质条件,对比选取塑料排水板排水固结法加固护岸工程的水下软土地基。系统介绍了塑料排水板的加固机理、排水板的选型、施工工艺、质量控制要点。经过对处理后地基的沉降、位移的长期跟踪观测,结果表明:采用排水板排水加固水下软土地基,取得了理想效果,具有一定的工程指导意义。     

塑料排水板加固水下软基的方法及设备

介绍了最新研制的水下软基处理船。其中包括塑料排水板插设、土工布铺设、水上定位和电脑监测记录方法和装置等。该船适用于多种水下软基处理工程,解决了深水塑料排水板加固软基的方法和设备问题。     

塑料排水板超载预压法处理软基在环胶州湾公路工程中的应用

塑料板排水法是近年来在软基处理中应用较广泛的一般方法。本文结合环胶州湾公路工程实例,介绍了塑料排水板超载预压法处理软基的施工方法。     

青岛港液体化工码头区软基处理方法的对比分析研究

使用层次分析法,对青岛港港池浚深挖泥吹填形成的液体化工码头的软基处理方法进行优选。结合土质特点等因素,分区进行不同工艺的分析,建议真空预压法和强夯法进行地基处理。两种方法的地基处理资料对比表明,真空预压法为首选处理工艺。     

A new method of combination of electroosmosis,vacuum and surcharge preloading for soft ground improvement

As a rapid and effective ground improvement method is urgently required for the booming land reclamation in China＇s coastal area, this study proposes a new combined method of electroosmosis, vacuum preloading and surcharge preloading. A new type of electrical prefabricated vertical drain （ePVD） and a new electroosmotic drainage system are suggested to allow the application of the new method. This combined method is then field-tested and compared with the conventional vacuum combined with surcharge preloading method. The monitoring and foundation test results show that the new method induces a settlement 20% larger than that of the conventional vacuum combined with surcharge preloading method in the same treatment period, and saves approximately half of the treatment time compared with the vacuum combined with surcharge preloading method according to the finite element prediction of the settlement. The proposed method also increases the vane shear strength of the soil significantly. The bearing capacity of the ground improved by use of the new proposed method raises 118%. In comparison, there is only a 75% rise when using the vacuum combined with surcharge preloading method during the same reinforcement period. All results indicate that the proposed combined method is effective and suitable for reinforcing the soft clay ground. Besides, the voltage applied between the anode and cathode increases exponentially versus treatment time when the output current of power supplies is kept constant. Most of the voltage potential in electroosmosis is lost at electrodes, leaving smaller than 50% of the voltage to be effectively transmitted into the soil.     

海涂围垦工程中悬挂式爆破挤淤基础处理技术探讨

沿海软土地基围涂工程中悬挂式爆破挤淤基础处理断面结构设计中遇到的最大难题是对腰宽的处理,腰宽太窄则工后沉降大,反之,则断面石方量增大,投资增加,因此,试图通过工程实例说明悬挂式爆破挤淤基础处理断面设计及工程实施过程中遇到的问题及对策措施。