Shao Shuai, Wu Yimin, Fu Helin, Feng Sheng, Zhang Jiawei
School of Civil Engineering, Central South University, Changsha 410075, China.
Hubei Communications Planning and Design Institute Co., Ltd., Wuhan 430051, China.
Materials (Basel). 2023 Jun 8;16(12):4248. doi: 10.3390/ma16124248.
This study investigates the influence of longitudinal through voids on vault lining. Firstly, a loading test was carried out on a local void model, and the CDP model was used for numerical verification. It was found that the damage to the lining caused by a longitudinal through void was primarily located at the void boundary. On the basis of these findings, an overall model of the vault's through void was established using the CDP model. The effects of the void on the circumferential stress, vertical deformation, axial force, and bending moment of the lining surface were analyzed, and the damage characteristics of the vault's through void lining were studied. The results indicated that the through void of the vault caused circumferential tensile stress on the lining surface of the void boundary, while the compressive stress of the vault increased significantly, resulting in a relatively uplifted vault. Furthermore, the axial force within the void range decreased, and the local positive bending moment at the void boundary increased significantly. The impact of the void increased gradually with the height of the void. If the height of the longitudinal through void is large, the inner surface of the lining at the void boundary will crack longitudinally, and the vault will be at risk of falling blocks or even being crushed.
本研究调查了纵向贯通孔洞对拱顶衬砌的影响。首先，对局部空洞模型进行了加载试验，并采用CDP模型进行数值验证。发现纵向贯通孔洞对衬砌造成的损伤主要位于孔洞边界处。基于这些发现，利用CDP模型建立了拱顶贯通孔洞的整体模型。分析了孔洞对衬砌表面环向应力、竖向变形、轴力和弯矩的影响，并研究了拱顶贯通孔洞衬砌的损伤特性。结果表明，拱顶的贯通孔洞在孔洞边界衬砌表面引起环向拉应力，同时拱顶的压应力显著增加，导致拱顶相对隆起。此外，孔洞范围内的轴力减小，孔洞边界处的局部正弯矩显著增加。孔洞的影响随孔洞高度的增加而逐渐增大。如果纵向贯通孔洞的高度较大，孔洞边界处衬砌的内表面将出现纵向裂缝，拱顶有掉落块体甚至被压碎的风险。
