基於Rockfall軟體的隧道洞口落石運動軌跡及支護效果評估

EVALUATION OF MOVEMENT TRACK AND IT'S SUPPORT EFFECT OF TUNNEL PORTALS ROCKFALLS BASED ON ROCKFALL SOFTWARE

10.6652/JoCICHE.202406_36(4).0004

趙立財(Li-Cai Zhao)；陳希舜(Shi-Shuenn Chen)

Rockfall軟體 ； 隧道洞口 ； 崩落岩塊 ； 運動軌跡 ； 支護效果 ； rockfall software ； tunnel portals ； collapsed rock block ； movement track ； supporting effect

中國土木水利工程學刊

36卷4期（2024 / 06 / 01）

357 - 363

繁體中文;英文

掌握隧道洞口危岩塊的運動軌跡，將有助於對後期崩落岩塊支護評估具有重要的意義。本文以中國雲南省陽宗隧道洞口崩落岩塊為案例，在採用極射赤平投影法對崩落岩塊穩定性分析的基礎上，對崩塌落石運動過程中的機制進行了闡述，并利用Rockfall軟體模拟了崩塌落石的運動軌跡與特徵，并針對自然狀態下攔石牆、攔石網、落石槽三種常見的攔擋措施，進行了支護效果評估。結果表明：研究對象所處邊坡是以大角度順向坡、斜交坡為主，坡體節理走向以北西向發育為主，邊坡崩落岩塊的穩定性狀態會受到節理裂隙發育程度的影響；崩落岩塊形成的落石在坡面上的運動形式主要包括：飛行和碰撞兩種基本模式，其在碰撞階段容易造成速度大小和方向的突變以及能量的急劇損失，在所採用的支護措施中，攔石牆的支護效果最佳，其次為攔石網，落石槽效果最差。本研究成果可為同類型情況下的崩塌落石研究提供借鑒意義。

To timely grasp the movement track of dangerous rock mass at tunnel portals, it is of great significance to support evaluation of collapsed rock block in later stage. In this paper, the case of collapsed rock block at Yangzong tunnel portals in Yunnan Province, on the basis of the stability analysis of collapsed rock block by the stereographic projection method, the mechanism during the movement of avalanche rockfalls was elaborated, the mechanism of the movement process of collapsed rock block was elaborated. The movement track and characteristics of collapsed rockfall were simulated by rockfall software, and the support effect was evaluated for three common blocking measures in the natural state: retaining wall, stone barrier net and rockfall trough. The results show that slope of the study object is mainly large-angle dip slope and oblique slope and the trend of rock-slope with joints are mainly developed in the north and west direction, the stability status of slope collapsed rock block is affected by the degree of joints fracture development. The movement form of collapsed rock block rockfalls formed on slopes mainly include two basic modes: flight and collision, which are easy to cause sudden change of velocity and direction as well as sharp loss of energy in the collision stage. Among the supporting measures adopted, the supporting effect of retaining wall is the best, followed by stone barrier net, and the effect of rockfall trough is the worst. This research result can provide reference significance for the study of collapsed rock block rockfall under the same type of working conditions.