【摘要】 排水板是排水固结法中的典型竖向排水体，其芯板抗压性能是控制排水板在堆载与真空预压作用下是否发生压屈失稳的关键指标。现行规范多沿用土工合成材料的试验思路，将芯板沿通水方向裁剪，制备受压面积为50 cm~2的圆形试样，采用位移控制加载，记录荷载-位移曲线，并将压屈荷载与受压面积的比值定义为芯板压屈强度。在制备过程中，存在两个影响制样精度的因素：（1）将矩形样品裁剪成圆形的过程中，不可避免地对样品裁剪邻近部分的齿条造成损坏；（2）不同裁剪位置对应的样品，其齿条的数量和长度均有差异。这些因素导致的相对误差（约10%）严重影响了排水板降解性能与老化性能的定量化评估。在此背景下，本文从芯板受力机制出发，提出累计齿条长度概念，将芯板视为由若干承压齿条组成的线承载体系，将峰值压缩荷载与累计齿条长度的比值定义为齿条压缩强力（kN/m）。采用万能试验机对B型排水板芯板试样进行了单轴压缩试验。试样涵盖圆形、正方形和矩形3种几何形状，受压面积包括30 cm~2、50 cm~2和100 cm~2，共计11组。将芯板压屈强度与齿条压缩强力的统计特征进行对比分析，结果表明：芯板压屈强度的范围为1.30～1.45 MPa，整体变异系数约3.22%；而齿条压缩强力的范围为4.48～4.53 kN/m，整体变异系数仅约0.42%。在相同材料与加载条件下，齿条压缩强力几乎不受试样几何形状和受压面积的影响，可视为芯板的固有抗压指标。该方法在不引入其他测试手段的前提下，减小了现有试验方法的离散性，有望成为现行规范中芯板抗压性能评价的有益补充，为排水板产品检测及地基处理的精细化设计提供参考。更多还原

【Abstract】 Prefabricated vertical drains(PVDs) are typical vertical drainage bodies employed in drainage consolidation methods. The compressive performance of the drain core is a critical indicator governing whether buckling instability occurs in PVDs under surcharge preloading or vacuum preloading. Current specifications often follow the testing methodologies established for geosynthetic materials: the core is cut along the direction of water flow to prepare circular specimens with a pressurized area of 50 cm~2, displacement-controlled loading is applied, load-displacement curves are recorded, and the core buckling strength is defined as the ratio of the buckling force to the pressurized area. During specimen preparation, two factors affect the accuracy of sample preparation:(1) the process of cutting rectangular samples into circular shapes inevitably damages the ribs adjacent to the cutting line;(2) the number and length of ribs contained within a specimen vary depending on the cutting position. The relative error(approximately 10%) introduced by these factors significantly hinders the quantitative assessment of the degradation and aging properties of PVDs.Against this backdrop, this study proposes the concept of cumulative rib length based on the mechanical behavior of the core. The core is regarded as a linear load-bearing system composed of numerous compressive ribs, and the rib compressive strength(kN/m) is defined as the ratio of the peak compressive load to the cumulative rib length. Uniaxial compression tests were conducted on Type B PVD core specimens using a universal testing machine. The specimens encompassed three geometric shapes—circular, square, and rectangular—with pressurized areas of 30 cm~2, 50 cm~2, and 100 cm~2, totaling eleven groups. A comparative statistical analysis was performed between the core buckling strength and the rib compressive strength. The results indicate that the core buckling strength ranges from 1.30 MPa to 1.45 MPa, with an overall coefficient of variation(CV) of approximately 3.22%. In contrast, the rib compressive strength ranges from 4.48 kN/m to 4.53 kN/m, with an overall CV of only about 0.42%. Under identical material and loading conditions, the rib compressive strength is virtually unaffected by specimen geometry or pressurized area and can be regarded as an intrinsic compressive property index of the core. Without introducing additional testing procedures, the proposed method reduces the discreteness inherent in existing test methods and holds promise as a valuable supplement to the evaluation indices for core compressive performance in current specifications. It provides a reference for advancing the refinement of PVD product testing and ground improvement design.更多还原