公路雪崩危险指标与雪崩灾害评价──—以伊(犁)焉(耆)公路巩乃斯沟口至艾肯山隘段为例

CALCULATION OF AVALANCHE HAZARD－INDEXES AND EVALUATION OF AVALANCHE DISASTERS ALONG A MOUNTAIN HIGHWAY─A Case Study along a Section of Ili－Yangqi Highway

雪崩危险指标是评价雪崩对公路危害程度的主要依据之一。利用已有资料对伊焉公路巩乃斯沟口至艾肯山隘段的雪崩危险指标进行了分段计算，结果表明，该路段雪崩危险指标在0．022－2．685范围内，与国外资料相比，用于小量级，其主要原因是车（人）流量小。同时，利用上述计算结果并结合该路段的雪崩危害史，进行了雪崩灾害评价，评价结果反映在该路段灾害程度划分图上。

Avalanche hazard－index is one of the basic data for the highways with snow avalanbhedisasters. Based on the available data of avaIanche disasters, avalanche hazard－indexes werecalculated sectionally along the Ili－Yanqi Highway. The results show that the avalanche hazard－indexes range from 0.022 to 2. 685, which are low compared with those in abroad due tothe low traffic stream in snow season. Furthermore, an avalanche risk evaluation was carriedout according to the calculated values and historical records of avalanche hazards－indexes range from 0.022 to 2.865, which are low compared with those in abroad due to the low traffic stream in snow season. Furthermore, an avalanche risk evaluation was carried out according to the calculated values and historical records of avalanche hazards.