天水市国际陆港葫芦河大桥建设用地地质灾害危险性评估与防治

Risk assessment and prevention of geological hazard for construction land of Huluhe Bridge in international land port of Tianshui City

葫芦河大桥拟建场地地处葫芦河河谷,场地内岩土条件复杂。本文对葫芦河大桥建设用地进行地质灾害危险性评估,提出了针对性的防治措施。调查评价发现水体对混凝土结构及结构中的钢筋具有弱、微弱腐蚀性,应做好防腐措施;泥岩是拟建桥梁良好的基础持力层,桩基应穿透至底层泥岩;大桥桥墩采用摩擦桩,桩基施工时采取防护措施,防止塌孔现象发生;施工应做好排水措施,防止泥岩层软化对桥墩造成危害。

The proposed construction site of Huluhe Bridge is located in Huluhe valley with complex rock and soil conditions.This paper evaluated the geological hazard risk of the construction land of Huluhe Bridge and put forward corresponding prevention and control measures.It was found that water showed weak corrosiveness to concrete structure and steel bar in the structure,which meant that anti-corrosion measures should be taken.Mudstone was a good foundation bearing layer for the proposed bridge,and the pile foundation should penetrate to the bottom mudstone.Considering that friction piles would be used in bridge piers,protective measures should be taken in pile foundation construction to prevent hole collapse.Meanwhile,drainage measures should be taken in construction to prevent mudstone layer softening and harm to bridge pier.