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对沿溪(河)线的设线高程问题,一般都着重以安全可靠为原则。在以往的设计规范(准则)和新的《公路工程技术标准》中历来有所规定,路基高度应高出各级公路所规定的洪水频率计算水位0.5米以上。而对各级公路的设计洪水频率,除四级路按具体情况确定外,其余各级路都有明确规定。但近几年来据各地有关资料报导,时有道路水毁情况发生,尤以沿溪线居多。针对水毁情况,
On the line along the river (river) line elevation problems are generally focused on the principle of safety and reliability. It has always been stipulated in the previous design codes (norms) and the new Technical Standards for Highway Engineering that the height of the subgrade should be higher than the flood water level calculated by the highway at all levels by more than 0.5 meters. However, the design flood frequency of all levels of roads, in addition to the four-tier road according to the specific circumstances to be determined, the rest of the road have a clear rule. However, in recent years, it has been reported in various places on the basis of information that sometimes road water damage occurs, especially along the Brookline. For the water damage situation,