School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, China.
Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo, China.
PLoS One. 2024 Aug 23;19(8):e0307190. doi: 10.1371/journal.pone.0307190. eCollection 2024.
In order to study the tensile properties of rock-concrete composite disc specimens with different roughness, the surface of the gray-white sand specimen was artificially grooved, and six different roughness were configured. The test results show that the roughness size and roughness mode jointly control the tensile strength of the rock-concrete interface. With the increase of roughness, the tensile strength of the sample changes from the initial decrease to the increase and then decrease, and the tensile strength reaches the highest when the roughness is f3. The variation trend of pre-peak energy accumulation and post-peak energy accumulation of the sample is opposite, and the dissipation energy is closely related to the crack propagation strain. The roughness and crack closure strain, crack peak strain, crack propagation strain and crack closure stress show a sinusoidal periodic variation. The crack propagation strain is closely related to the change of dissipation energy. The change trend of crack closure stress is basically consistent with the change trend of tensile strength. Therefore, in the actual project, grasping the period of roughness variation and selecting the construction position can make the rock-concrete interface stable and get twice the result with half the effort.
为了研究不同粗糙度的灰岩-混凝土复合盘试件的拉伸性能，对灰白色砂岩试件表面进行人工开槽，配置了六种不同的粗糙度。试验结果表明，粗糙度大小和粗糙度模式共同控制着岩-混凝土界面的拉伸强度。随着粗糙度的增加，试样的拉伸强度先由减小变为增加，然后再减小，当粗糙度为 f3 时，试样的拉伸强度达到最高。试样的峰前能量积累和峰后能量积累的变化趋势相反，耗散能与裂纹扩展应变密切相关。粗糙度和裂纹闭合应变、裂纹峰值应变、裂纹扩展应变和裂纹闭合应力呈正弦周期性变化。裂纹扩展应变与耗散能的变化密切相关。裂纹闭合应力的变化趋势与拉伸强度的变化趋势基本一致。因此，在实际工程中，把握粗糙度变化的周期，选择施工位置，可以使岩-混凝土界面稳定，事半功倍。
