论文部分内容阅读
在热带、亚热带潮湿多雨的气候环境中,由母岩经长期风化淋滤作用形成的残积粘性土是一种含水量高、液限大、呈硬塑状态,并有较高强度的特殊土。马达加斯加国家(简称“马国”)二号公路布——昂段全长83.5公里就穿越这种厚达数十米的残积粘性土层。边坡开挖后的第三年,即1982年的第一季度连续降雨60天,降雨量达1873毫米,造成新开挖的布——昂段有35处发生塌坍。时隔2年后的1984年4月18日—4月22日,由于受印度洋台风影响,连续降雨706毫米,又造成布——昂段第二次的严重水毁坍方。坍方数量约八万余立方米,为此增加了大量的清方数量,添置了不少防护设施,影响了道路的正常使用和路容的美观。笔者根据1982年对布——昂段边坡的实地调查,并参考有关文献,撰成此文。从残积粘性土的工程特性,结构面的产状与路线的关系,以及降水的影响等方面对残积粘性土边坡稳定性进行分析评价,并提出了相应的边坡设计意见供援外工程应用。
In the tropical and subtropical humid and rainy climatic environment, the residual cohesive soil formed by long-term weathering and leaching of parent rock is a special soil with high water content, large liquid limit, hard plastic state and high strength. Madagascar country (referred to as “horse country”) Route 2 Bu-Ang segment 83.5 km in length through the thickness of tens of meters of residual clay layer. In the third year after the excavation of the slope, that is, the rainfall in the first quarter of 1982 continued for 60 days and the rainfall reached 1,873 mm, resulting in 35 collapses in the newly excavated Bu-Ang segment. After a lapse of two years, from April 18 to April 22, 1984, a continuous rainfall of 706 millimeters resulted from the typhoon in the Indian Ocean, causing the second serious flood collapse of Bu-Ang. The number of collapses is about 80,000 cubic meters, thus increasing the amount of Qing Fang and adding a lot of protective facilities, affecting the normal use of the road and the beautiful appearance of the road. Based on the field investigation of the Bu-Ang section of slope in 1982 and with reference to relevant documents, the author has written this article. This paper analyzes and evaluates the stability of the residual cohesive soil slope from the engineering characteristics of the residual cohesive soil, the relationship between the appearance of the structural plane and the route, and the influence of precipitation. The corresponding slope design opinions are put forward for the application of foreign aid projects.