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STUDY OF SEEPAGE AND PIPING THROUGH DIKE FOUNDATION
Author(s): 
Pages: 41-43
Year: Issue:  3
Journal: DAM OBSERVATION AND GEOTECHNICAL TESTS

Keyword:  渗漏涌砂完整井非完整井;
Abstract: 本文将堤基的工程地质条件划分为四种类型,即二元结构型、透水层型、软粘土型和基岩型。对二元结构型堤基,分析了渗漏涌砂的成因,包括承压水头大小、砂砾石层透水性及粘性土厚度、基岩断裂构造、地下水的水文地球化学作用等。在上述分析的基础上,提出了堤基渗漏涌砂的两个理论模型,即均质各向同性砂砾石层中的非完整井和完整井模型。当砂砾石层较厚时,涌砂的发生、发展符合紧靠上覆粘性土层的半球形井底模型,涌砂临界面既向堤防方向发展,也向深部扩展,涌水口的冒沙量主要来自涌水口附近,向深部和堤防方向似层状汇聚并涌出;当砂砾石层相对较薄时,涌砂的发生、发展过程符合完整井模型。涌砂临界面呈椭球柱状,并向堤防方向发展,涌水口的冒沙量来自涌水口附近,但在整个含水层厚度上汇聚并向堤防方向扩展。
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