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高应力环境中钙质砂的颗粒破碎会影响其工程稳定性,利用液压万能试验机在侧限条件下对0.25mm~0.5mm、1mm~2mm、2mm~5mm粒径和混合粒组钙质砂进行高压加载,研究终止压力、平均粒径、干密度等因素对其颗粒破碎影响。试验结果表明:终止压力P值对钙质砂颗粒相对破碎率Br值影响显著,用Slogistic函数拟合后相关性良好,根据拟合曲线可将破碎分为渐增和缓增阶段;同时相对破碎率Br与试样平均粒径d50呈线性负相关;控制变形速率和终止压力相同,干密度大的试样加荷速率更快,相对破碎率Br比干密度低的试样略大;同等终止压力水平下混合粒组钙质砂相对破碎率Br远小于单粒组;高压加载导致级配和粒组百分含量变化十分显著,工程中应充分考虑其对钙质砂工程性质的影响。试验结论对海相钙质砂区域工程建设具有参考意义。
Particle crushing of calcareous sand in high stress environment will affect the stability of engineering. Using hydraulic universal testing machine, under the confined conditions, the effects of particle size of 0.25mm ~ 0.5mm, 1mm ~ 2mm, 2mm ~ 5mm and calcareous sand High-pressure loading, study the termination pressure, the average particle size, dry density and other factors on the particle crushing. The experimental results show that the P value of termination pressure has a significant effect on the relative breakage Br value of calcareous sand particles, and the correlation is good after fitting by Slogistic function. According to the fitting curve, the breakage can be divided into gradual increase and gentle increase phases. Br and sample average particle size d50 linearly negative correlation; control deformation rate and termination pressure is the same, the sample density of dry bulk faster loading rate, relative breaking rate Br than dry density sample slightly larger; the same termination pressure The relative broken rate Br of the calcareous sand at the mixed granule level is much less than that of the single granule group. The changes of the percentage and the granule percentage under the high pressure are very significant. The project should fully consider its influence on the engineering properties of the calcareous sand. The conclusion of the experiment is of reference significance to the construction of marine calcareous sand area.