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高速公路边坡稳定性评估对于公路建设方案优化,提高边坡支护工程措施的科学性和使用安全性,保证高速公路边坡正常建设和安全运营具有重要的现实意义。充分考虑边坡地质环境条件,综合分析谷竹高速公路珠藏洞隧道进口段边坡的稳定性,并分析评估隧道爆破施工对边坡稳定性的影响。评估结果表明边坡整体处于稳定,隧道爆破振动对边坡稳定性的影响很小,但不能排除在暴雨、地震、爆破震动等特殊条件下,边坡会发生局部掉块的可能性;建议采取系统锚杆和适当的预应力锚索支护,并对局部岩体破碎区采取柔性网防护。
The evaluation of highway slope stability is of great practical significance for the optimization of highway construction plan, improving the scientificity and safety of engineering measures for slope supporting and ensuring the normal construction and safe operation of expressway slope. Considering the geological conditions of the slope, the stability of slope at the entrance of Zhuzhundong tunnel of Guzhuo Expressway is comprehensively analyzed, and the influence of tunnel blasting on slope stability is analyzed and evaluated. The assessment results show that the whole slope is stable, and the impact of tunnel blasting vibration has little effect on the stability of the slope, but it can not be ruled out that the slope may be partially dropped off under the special conditions such as rainstorm, earthquake and blasting vibration; System bolts and appropriate prestressed anchor cable support, and partial rock crushing zone to take flexible network protection.