强夯法处理湿陷黄土坝基中的一些问题

Some Problems about Treating Dam Foundation of Collapsibility Loess by Strong Tamping

分析湿陷性黄土地基筑坝的技术特点,提出强夯有效加固深度宜分别用湿陷性消除深度与密实度有效增加深度两个指标界定。夯后密实度与地基土层原始含水量密切相关,随深度递减,且密实度有效增加深度小于湿陷性消除深度。设计应根据坝体稳定、变形及渗流控制要求,提出地基强夯设计参数,并通过现场试验验证其合理性,相应调整坝体结构设计。

The technical features to construct dam on collapsibility loess foundation are analyzed.The effective consolidation depth by strong tamping may be defined by collapsibility-eliminating depth and effective density- increasing depth.The density after tamping is in relation to the oridinal soil moisture content and decreases in pace with the increase of depth,and the effective density-increasing depth is less than the collapsibility-eliminating depth. In design,the design parameters of strongly tamping foundation must be put forward according to the demands of dam stability,deformation and seepage control,and the reasonableness of parameters must be tested and verified by test in place,and thereby the dam structure design must be regulated.