雪山河流域泥石流灾害防治效果分析

Analysis of Debris Flow Hazard Remediation Methods of Xueshan River Basin

雪山河流域近年泥石流地灾频繁发生,雪山河位于点仓山西麓的云南省大理市漾濞县,地质构造复杂,岩体破碎,加上短时雨强形成大量潜在的崩塌堆积物源。通过对雪山河流域考察,评估了以往泥石流灾害治理方式,剖析了已有治理工程的防治模式。结果显示,以＂拦＋稳＂为主的前期措施其治理效果并不显著。基于本流域泥石流的特征,指出了其存在的问题,并建议今后对类似大流域、大规模泥石流灾害治理以排导工程为主,拦挡工程为辅,生物工程和预警预报监测相结合的防治方案。

Debris flow hazards are frequently occurred in Xueshan River Basin recently.Remediation measures were applied at various locations in different time.A comprehensive analysis of the results of existing debris mitigation projects can provide indepth understanding for the future engineering applications.Xueshan River is in Yangbi County of Dali City at the west side of Diancang Mountain.The tectonic structure of the area is complicated with broken rock mass and it also has a large amount of colluvium material derived from the collapse of the rock mass due to the intense precipitations in a short period time.The authors conducted a geological investigation in the Xueshan River watershed and evaluated the results of various debris flow mitigation measures.It is concluded that the mitigation method with the idea of cut-off and stabilizing are not very effective.The more effective mitigation measures should have an idea of mainly diversion plus some of engineering stabilization,bio-engineering as well as monitoring measures.