为进一步研究隧道新型初期支护模袋混凝土的抗压力学性能，对原试验试验设计与制作过程进行改进，使得试件制作过程更加符合模袋混凝土实际施工工艺，并针对3个龄期（3、7、28 d）进行了不同试验工况的制作，分析不同龄期下模袋、加压排水压力、加压排水时间3个因素对混凝土抗压力学性能产生的影响以及不同工况试件的破坏形态。结果表明： 1）模袋显著提高了混凝土的抗压强度以及整体的变形能力。2）加压排水压力和加压排水时间提高模袋混凝土的抗压强度和整体变形能力的程度不同，一定时间的加压排水压力的提高效果要好于一定压力的加压排水时间。3）普通混凝土试块是形成角锥形破坏面；无模袋混凝土试块是沿着平行于力的作用方向破坏； 模袋混凝土试块破坏形态从正面来看呈现散落“花”状。
To further investigate the compressive mechanical
properties of new mold bag concrete for primary support of tunnels, the
original test procedure is improved to fulfill the actual construction
requirements of mold bag concrete during specimen processing. Accordingly, various
test conditions are created for specimens aged 3, 7, and 28 days, and the
influence of these mold bags, pressurized drainage pressures, and pressurized
drainage times on the compressive mechanical properties of the concrete are
analyzed, along with the failure modes of the specimens under various working
conditions. The present findings are stated as follows: (1) The mold bags
significantly improve the compressive strength and overall deformation capacity
of the concrete. (2) The overall deformation capacity and compressive strength
of the mold bag concrete vary with the pressurized drainage pressure and
pressurized drainage time, and the pressurized drainage pressure over a certain
time provides a greater enhancement than the pressurized drainage time under a
certain pressure. (3) The normal concrete specimens are damaged in the shape of
an angular cone, the nonmold bag concrete specimens are damaged along the
parallel direction of the applied load, and the mold bag concrete specimens
display a petal shape from the front view.
