In this study, a new buffering system with geocell is proposed as a buffer for concrete rock-fall protection retaining walls, and real-scale impact loading tests were conducted to investigate its buffering capacity and failure behavior. Geocell filled with single-grain crushed stone was placed in front of a rigid wall that simulated a retaining wall, and the experiments were performed by allowing the weight to horizontally collide by pendular movement. Transmitted stress was measured with load cells embedded in the rigid wall. The following results were obtained: (1) The falling weight did not bounce and the proposed geocell buffering system absorbed the total input energy. (2) Lame’s constant is evaluated as λ = 1500 kN/m² in all cases, which is approximately 1.5 times higher than when sand is used as a cushion material and is considered a design value. (3) Geocell buffering systems exhibit sufficient buffering performance, even with second impact loading. (4) The impact resistance of the concrete retaining wall is improved approximately 17 times by installing a geocell buffering system in front. Future studies should clarify the buffering effect of the geocell buffering method and establish an impact-resistant design method that also considers the overturn and sliding of the concrete retaining wall. When the proposed method is put into practical use, it is possible to improve the impact resistance of existing concrete retaining walls at low cost and in a short period. This can protect human lives and a smooth transportation network from unexpected large rock falls.

中文翻译：

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单粒碎石填充土工格室的混凝土挡土墙缓冲体系试验研究。

在这项研究中，提出了一种带有土工格室的新型缓冲系统，作为混凝土防落石挡土墙的缓冲，并进行了实际冲击载荷试验以研究其缓冲能力和破坏行为。将充满单粒碎石的Geocell放在模拟挡土墙的刚性墙前面，并通过摆锤使重物水平碰撞来进行实验。传递的应力通过嵌入刚性壁中的测力计进行测量。得到以下结果：（1）重量下降并没有反弹，拟议的土工单元缓冲系统吸收了总输入能量。（2）Lame常数评估为λ  = 1500 kN / m ²在所有情况下，其比使用沙子作为垫层材料时高约1.5倍，被认为是设计值。（3）Geocell缓冲系统即使在第二次冲击载荷下也表现出足够的缓冲性能。（4）通过在前面安装土工格架缓冲系统，混凝土挡土墙的抗冲击性提高了约17倍。未来的研究应阐明土工格室缓冲方法的缓冲效果，并建立一种耐冲击的设计方法，该方法还应考虑混凝土挡土墙的倾覆和滑动。当所提出的方法投入实际使用时，可以低成本且在短时间内提高现有混凝土挡土墙的抗冲击性。这样可以保护人们的生命，并确保畅通无阻的交通网络免遭意外的大石块袭击。