Du Jijie, Liu Jiaqi, Lyu Xianzhou, Zhai Peihe, Wang Weiming
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China.
ACS Omega. 2022 Aug 4;7(32):28016-28029. doi: 10.1021/acsomega.2c01896. eCollection 2022 Aug 16.
Grouting is widely utilized to reinforce fractured surrounding rock. However, presently, the secondary stress distribution of fractured surrounding rock after grouting is not distinct, which hinders the accurate evaluation of the grouting effect. Therefore, a complex variable function solution is provided for the evolution of the stress field and the displacement field around the reinforced fractured surrounding rock subjected to a nonuniform load. By comparing the evolution of the stress and radial displacement fields around the cavern, the reinforcement effect on the fractured surrounding rock is quantitatively confirmed. The results show that grouting has an obvious modification effect on fractured surrounding rock: its radial stress and circumferential stress fields are affected to different degrees, and the circumferential stress is more obvious. Grouting makes the circumferential stress peak transfer from the wall of the cavern to the roof and floor of the cavern, which is beneficial to the stability of the cavern. The radial displacement around the cavern also decreases. The displacement of the wall decreases by approximately 24.0%, and the radial displacement of the roof and floor decreases by approximately 61.8%.
注浆被广泛用于加固破碎的围岩。然而，目前注浆后破碎围岩的二次应力分布并不清晰，这阻碍了对注浆效果的准确评估。因此，针对承受非均匀荷载的加固破碎围岩周围应力场和位移场的演化，给出了一个复变函数解。通过比较洞室周围应力场和径向位移场的演化，定量地确定了对破碎围岩的加固效果。结果表明，注浆对破碎围岩有明显的修正作用：其径向应力场和环向应力场受到不同程度的影响，且环向应力更为明显。注浆使环向应力峰值从洞壁转移到洞顶和洞底，这有利于洞室的稳定性。洞室周围的径向位移也减小。洞壁位移减小约24.0%，洞顶和洞底的径向位移减小约61.8%。
