黄冈长江干堤防渗方法研究

Study on Methods to Prevent Seepage at Huanggang Main Dike on Yangtze River

讨论了黄冈长江干堤堤身土质状况,对黄冈长江干堤堤基土层结构进行了分类。通过渗流计算提出了黄冈长江干堤典型断面堤基防渗加固处理措施。针对黄冈长江干堤堤基土层结构的特点,提出了黄冈长江干堤堤基防渗加固处理的原则,黄冈长江干堤加固的重点是堤基的防渗加固处理,应根据渗流计算的结果,考虑到堤防周围的地理、地质环境及人文社会因素,通过方案比较确定出合理的堤基防渗加固方案。由于黄冈长江干堤所在堤段的堤基透水层一般为砂壤土和粉细砂,因此黄冈长江干堤不宜于采用排渗井或减压沟进行堤基防渗。

Soil conditions of the dike body at Huanggang Yangtze river main dike is discussed.Soils of the dike body at Huanggang Yangtze river main dike are silt loams,silt clays,sandy loams and cracked stones. The structure of the soil layer of the dike foundation at Huanggang Yangtze river main dike is classified into class A, class B, class C and class D. The measure of seepage prevention in the dike foundation of the typical segment at Huanggang main dike on Yangtze river is given by means of seepage calculation . Considering the character of the structure of the soil layer at Huanggang Yangtze river main dike,principles to prevent seepage in the dike foundation at Huanggang Yangtze river main dike are given. The reinforcement of Huanggang Yangtze river main dike is the major methods to prevent seepage in the dike foundation. Methods to prevent seepage are on the basis of the results of seepage calculation,geographical and geological environments consideration and social factors near the dike. By means of comparison of projects ,the reasonable scheme to prevent seepage in the dike foundation is chosen . Because permeable layers in the dike foundation at Huanggang Yangtze river main dike are sandy loams and mealy sands,Huanggang main dike on Yangtze river can not use relief wells and relief ditches to prevent seepage in the dike foundation.