摘要
为了研究泥质软岩弃渣在路基填料中的应用,以成武(成县—武都)高速公路为工程依托,开展土工离心模型试验,对泥质软岩及3种改良填料路基沉降规律进行分析,研究泥质软岩弃渣及其改良填料路基2年内的沉降量、沉降速率和固结时间;并在依托工程试验段开展路基沉降监测,对砂砾改良后的泥质软岩弃渣填筑路基沉降规律进行研究。试验结果表明:泥质软岩弃渣直接填筑路基时的沉降最大,路基顶面中心线的沉降量为53.58mm,路基边缘的沉降量为49.25mm;与泥质软岩弃渣直接填筑路基相比,砂砾改良后的泥质软岩弃渣填料路基沉降量最小,路基顶面中心线的沉降量减小了34.7%,路基边缘的沉降量减小了33%;泥质软岩弃渣直接填筑的路基沉降速率最大,为0.5mm/d,砂砾改良后的泥质软岩弃渣填料路基沉降速率最小,为0.2mm/d,比泥质软岩弃渣直接填筑路基时的沉降速率减小60%;4种方案固结时间由长到短依次为泥质软岩弃渣、土工格室加固、水泥改良、砂砾改良;试验段砂砾改良后的泥质软岩弃渣填筑路基沉降也呈现出路基顶面中心处较大,两侧沉降量较小的特征,前30d路基顶面沉降的速率最大,144d后路基顶面最大沉降量达到27.1mm;靠近边坡端的沉降量比靠近挡土墙端的大;沉降监测结果与试验结果基本吻合,研究结果可为类似工程提供借鉴。
To study the application of argillaceous soft rock discard in subgrade filling, considering the Chengwu （Chengxian to Wudu） Expressway as the engineering background, the settlement law of argillaceous soft rock and three kinds of modified fillers were analyzed using a centrifugal modeling test. Furthermore, the settlement, the settlement rate, and the two-year consolidation time of four kinds of waste slag fillers were investigated. The settlement monitoring of the subgrade was presented in the test section of the project, and the settlement law of the subgrade of the mud soft rock slag after improvements by gravel, was studied. The results show that the settlement of subgrade filled by argillaceous soft rock is the largest. Moreover, the settlement of the top surface of the embankment center line is 53. 58 mm, the edge of the subgrade is 49. 25 mm, whereas embankment filling with gravel treatment has a minimum settlement, the settlement of the top surface of the embankment center line is 35 ram, which decreased by 34.7%, and the settlement of the edge of the subgrade is 33 mm, which decreased by 33%. The subgrade filled by argillaceous soft rock has a maximum settlement rate, up to 0.5 mm/d, however, the settlement rate of the filling with gravel treatment is minimum, with 0.2 mm/d. The order of the sequence of decreasing consolidation times is argillaceous soft rock, reinforced with geocell, cement treatment, and gravel treatment. The settlement of roadbed filled with argillaceous soft rock presents the characteristics of a larger center at the top of the foundation and a smaller settlement on both sides, the settlement rate of the top of the subgrade before 30 d is the maximum, and the maximum settlement after 144 d reaches 27.1 mm. Due to the difference between the retaining wall and subgrade slope, the settlement near the end of the slope is larger than that near the retaining wall. The settlement law of the observation points is similar, which is also in good agreement with the test results. The researc
作者
杜耀辉
杨晓华
王明皎
DU Yao-hui;YANG Xiao-hua;WANG Ming-jiao(School of Highway, Chang＇an University, Xi＇an 710064, Shaanxi, China;Gansu Changda Highway Co., Ltd., Lanzhou 730000, Gansu, China)
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第3期18-25,共8页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(41272285)
关键词
道路工程
泥质软岩
离心模型试验
沉降规律
现场监测
road engineering
argillaceous soft rock
centrifugal model test
settlement law
in-situ monitoring
