高速公路路面渗水的环境灾害分析及其治理

本文以广东花清高速公路路面渗水问题为例,进行环境灾害分析并提出有效防治措施。通过现场水文地质试验、岩土测试以及综合环境地质调查,研究结果表明渗水由弱透水层中的潜水引起,连续降雨期间,在各种地质环境因素的共同作用下,弱透水层中的孔隙潜水面上升造成,而潜水的补给来源是分水村环形山谷中的地下水和地表水。针对其成因提出了降水盲沟的治理措施。综合考虑各种环境条件的情况下,通过降低高速公路附近的地下水水位,路面渗水现象得到了较好的控制。该事故表明在岩土工程和环境工程研究中地下水的作用应该作为一种基本环境因素进行考虑,在全球气候发生变化的大环境背景条件下,多学科结合进行环境灾害的危险性评价显得十分重要。

Analysis and Remediation of Environmental Geohazard for Highway Pavement Seepage

A case of highway pavement seepage induced by groundwater,at a location along the section of Hua-Qing Highway of Guangdong Province,China,is presented for environmental hazard analysis and effective remediation based on in-situ hydrogeologic investigation,rock-soil testing and integrated environmental investigation.The analyses indicate that the highway seepage was caused by the risw of groundwater hydraulic pressure in low permeable strata near the highway pavement,which was controlled by landform,hydrology,weather and road structure.The risk source of groundwater `flooding' was the groundwater and surface water in the ring-like valley around Fenshui Village.A blind-ditch system for effective remediation of the pavement seepage hazard was proposed and successfully implemented by drawing groundwater table down near the highway.This geotechnical accident shows that the role of groundwater is an essential factor to be considered in the geotechnical and environmental engineering studies and multidisciplinary effort for risk assessment of environmental hazards is important under current global climate change condition.