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结合山东某港口大面积吹填软土地基处理实践,阐述了真空联合堆载预压施工相关监测和检测内容及其基本操作方法;分析了真空联合堆载预压施工过程中土体表面沉降、分层沉降、深层水平位移以及孔隙水压力的发展变化过程和规律。表明真空联合堆载预压法加固软土地基具有真空预压和堆载预压的双重加固特征,堆载能加速软土地基的固结变形,但在堆荷较小情况下,被加固土体总体仍表现为土体向加固区中心位移的收缩固结变形特征。从工后现场原位测试及试样室内土工试验成果可以看出,淤泥土层加固后含水量、孔隙比均有大幅减小,土体物理力学性质得到较大改善,土体强度增长幅度可达100%～300%。说明真空联合堆载预压应用于处理大面积吹填软土地基是成功可行的,其加固效果明显,有效影响范围可达排水板深度。
Based on the practice of large area soft soil foundation filling in a port in Shandong Province, the contents of monitoring and testing as well as the basic operation methods of vacuum combined prestressed construction are expounded. The surface settlement, Stratification and settlement, deep horizontal displacement and pore water pressure development and change process and law. It is indicated that vacuum combined with surcharge preloading method can enhance the consolidation of soft ground under the conditions of vacuum preloading and surcharge preloading. The pile loading can accelerate the consolidation deformation of soft ground, but under the condition of small pile load, The whole body still shows the characteristics of shrinkage consolidation deformation of soil moving to the center of the reinforcement zone. It can be seen from the results of the in-situ tests at the post-construction site and the indoor laboratory tests of the samples that the moisture content and void ratio in the silt soil layer are greatly reduced, and the physical and mechanical properties of the soil body are greatly improved. Up to 100% to 300%. It shows that the vacuum preloading combined with preloading is feasible and feasible for the treatment of soft soil foundation with large area and the reinforcement effect is obvious and the effective influence range can reach the depth of drainage board.