高速公路低路堤路基服役狀態(tài)風險評估

徐敬業(yè) 徐林榮 張亮亮

摘要：高速公路低路堤受到路基高度的限制，容易產(chǎn)生工后沉降過大或不均勻沉降等問題。路基設計和養(yǎng)護規(guī)范中均未針對低路堤設計進行統(tǒng)一規(guī)定，導致低路堤在建設期、運營期存在影響工程正常使用的問題。借鑒地質(zhì)災害風險評估理論，分析干濕循環(huán)、交通荷載等影響因素，考慮養(yǎng)護維修對各因素進行修正，提出了低路堤路基服役狀態(tài)評估方法。該方法運用模糊綜合評價法和物元分析方法分析建設期結(jié)構(gòu)質(zhì)量易損性、運營期路基危險性及養(yǎng)護維修修正值，得出低路堤路基綜合風險度。將該方法運用于浙北低路堤段工程實例，得到的綜合風險度為低度，服役狀態(tài)風險程度與現(xiàn)場調(diào)查結(jié)果基本一致，說明了該評估方法的可行性。

關鍵詞：高速公路;路堤;路基;服役狀態(tài);風險評估

中圖分類號：U416.1 文獻標志碼：A 文章編號：20966717（2020）04003608

收稿日期：20191115

基金項目：國家自然科學基金（51778634）

作者簡介：徐敬業(yè)（1972 ），男，高級工程師，博士生，主要從事巖土工程研究，Email：837088296@qq.com。

徐林榮（通信作者），男，教授，Email：lrxu@csu.edu.cn。

Received：20191115

Foundation items：National Natural Science Foundation of China （No. 51778634）

Author brief：Xu Jingye（1972 ）， senior engineer， PhD candidate， main research interest： geotechnical engineering， Email： 837088296@qq.com.

Xu Linrong （corresponding author）， professor， Email： lrxu@csu.edu.cn.

Risk assessment of expressway lowembankmentsubgrade in service status

Xu Jingye a， Xu Linrong a，b， Zhang Liangliang a

（a. College of Civil Engineering; b. National Engineering Laboratory of Highspeed Railway Construction Technology， Central South University， Changsha 410075， P. R. China）

Abstract： The low embankment of the expressway is limited by the height of subgrade， and some special problems such as excessive settlement or uneven settlement are easily caused after construction. At present， the subgrade design and maintenance codes do not uniformly regulate the design of the low embankment， resulting in many problems that would affect the normal use of the structure during the construction and operation of the low embankment. Based on the risk assessment theory of geological disaster， this paper analyzed the effect of some factors such as drying and wetting cycle as well as traffic load on the low embankment of the expressway. In addition， considering the maintenance and repair， these factors were modified and the evaluation method of lowembankmentsubgrade in service status was proposed. Combined with fuzzy comprehensive evaluation method and matterelement analysis method， the structural quality vulnerability in construction period， the risk of subgrade in operation period and the modified value of maintenance and repair were analyzed. And then the comprehensive risk of lowembankmentsubgrade was obtained. The method was applied to a low embankment project in northern Zhejiang. The result shows that the comprehensive risk is low and the service state risk is basically consistent with the filed survey result， which illustrates the feasibility of the proposed evaluation method.

Keywords：expressway; embankment; subgrade; service status; risk assessment

高速公路廣泛采用高路堤（>2.5 m）設計方案，但采用高路堤會增大土石方工程量，而且在軟土地基廣泛分布的東南沿海地區(qū)，高路堤方案會出現(xiàn)路基不均勻沉降引起的縱橫向開裂、整體或局部下沉、路基滑坡或邊坡坍塌等問題[1]，因此，提出了高速公路低路堤的設計理念與方案。低路堤設計在高速公路建設中逐步得到推廣應用，如山東省濟青高速、河南省商開高速部分路段，均采用低路堤設計方案，取得了較好的社會經(jīng)濟效益。高……