论文部分内容阅读
水坠法筑坝技术是陕北、晋北人民创造的一种多快好省的新型筑坝技术,目前已在全国十三个省区推广应用。尤其是在轻粉质壤土地区和砾质粘土地区,如陕北、晋北、广东、广西和内蒙等地,显示了工效高、工期短、造价低、便于施工等优点。但在中、重粉质壤土地区,如关中、晋南、豫西、陇东等地区,由于土的含粘量较高,渗透系数小,土体中孔隙水压力消散缓慢,影响冲填体的脱水固结速率,所以坝体强度增长较慢,在施工期常常发生坝坡裂缝及鼓肚,甚至发生滑坡现象,造成工程事故。为了在中、重粉质壤土地区应用水坠法筑坝这一筑坝技术,近年来一些地方的群众先后采用了埋砂井或砂垫层、层泥层土等排水措施,以促进冲填体的脱水固结。特别是采用层泥层土的筑坝方法,有成功的,也有的发生了不少问题。因此,关于这一筑坝技术的科学性、可靠性及设计与施工的一些合理技术指标,都是工程上急待解决的问题,
The water-dropping method is a new type of dam-building technology created by the people of northern Shaanxi and northern Shanxi Provinces. It has been applied in 13 provinces and regions in the country. Especially in light silty loam areas and gravelly clay areas, such as northern Shaanxi, northern Shanxi, Guangdong, Guangxi, and Inner Mongolia, shows the advantages of high work efficiency, short construction period, low cost, and ease of construction. However, in the medium and heavy silty loam areas, such as Guanzhong, Jinnan, West Henan, and Jidong, due to the high clay content of the soil, the permeability coefficient is small, and pore water pressure dissipates slowly in the soil, affecting the troche. Due to the dehydration consolidation rate, the strength of the dam body grows slowly. Cracks and bulges of dam slopes often occur during construction, and even landslides occur, causing engineering accidents. In order to apply the water-dropping method to build dams in medium and heavy silt loam areas, in recent years, people in some places have adopted drainage measures such as sand-draining wells, sand cushions, and mud-layered soils to promote filling. Dehydration of the body. In particular, the method of dam construction using layered clay soil has been successful, and some problems have occurred. Therefore, the scientificity and reliability of this dam-building technology and some reasonable technical indicators for design and construction are all urgently needed to be solved in the project.