论土石围堰和基坑渗流场调控

Seepage Field Regulation for Rockfill Cofferdam and Foundation Pit

分析了围堰和基坑工程的特点;提出了渗流场调控的概念及调控的总体目标;强调保障调控效果就必须做到时机恰当、措施得当。按照实施的时机将调控措施分为预设措施和应急措施;归纳概括了针对性的调控措施及其适用条件;结合工程实例说明了预设措施失效时及时采取应急调控措施的重要性。渗流场调控理论充分考虑了渗流场在各种因素影响下的动态特点,可以指导在工程设计、施工和运行的全过程中布置和实施及时、有效的调控措施,以达到保障工程安全、控制工期和成本、减轻环境负效应的总体目标。渗流场调控理论对于所有涉水工程及与地下水有关的工程都具有重要意义。

The characteristics of cofferdam and foundation pit were analyzed.On this basis,the concept of seepage field regulation was put forward for cofferdam and foundation pit.The regulation aims at safety,construction period and cost control,as well as environment protection.It is emphasized that the efficiency can only be guaranteed by adequate and proper regulation measures at the right moment.The regulation measures were classified as preinstalled and urgent ones according to the time to take.Pertinent regulation measures and application conditions were presented.Furthermore,the importance of urgent measures when preinstalled measures failed was illustrated by an engineering example.The dynamic characteristics of seepage field corresponding to many factors were taken account into the seepage field regulation theory.With this theory,prompt and effective regulation measures would be arranged and fulfilled in the whole process through work planning,construction and operation to achieve aims inclusive of guaranteeing engineering safety,controlling construction period and cost,and mitigating negative effects on environment.Seepage field regulation theory is significant for all engineering involving surface and subsurface water.