摘要
利用TSP203对云南待功高速打营隧道左幅K20+220段塌方后塌方规模、塌腔稳定性及塌方段围岩稳定性进行了预报,研究了塌方后塌腔空洞范围、围岩塑性区及垂直垮塌高度的地震波反射特性,提出了塌方段围岩稳定性的判释原则,并就据此方法得出的预测结论和实际围岩开挖揭露状况进行了对比分析。结果表明,提出的方法对塌方段及前方一定距离的围岩稳定性预报具有一定的借鉴意义。
The forecast is made by utilizing TSP203 in the matter of collapse scale, cavity collapse stability and stability of surrounding rock at collapse section after the collapse of left K20 ＋ 220 section of camping tunnel of Yunnan Daigong expressway. The echoing characteristics of seismic wave of collapse cavity range, plastic zone of surrounding rock and vertical collapse height after the collapse are studied, the photo - interpretation principle of stability of surrounding rock at collapse section is put forward, and the contrastive analysis on forecast conclusion that is obtained by this method and excavation and exposure condition of practical surrounding rock is made. The results show that the proposed methods have certain reference significance for the forecast of stability of surrounding rock at collapse section and certain distance from the front.
出处
《北方交通》
2016年第9期48-52,共5页
Northern Communications
