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飞来峡水利枢纽工程河床段土坝为均质坝,其坝基高程14m以下为未经压实的吹填中粗砂及天然覆盖砂层。为防止河床段土坝砂基地震液化,确保土坝砂基稳定,减少大坝坝基沉陷,设计要求对该砂层进行振冲加固处理。为取得合理的振冲施工技术参数,保证施工顺利进行,由设计、施工等单位进行了现场试验,通过对河床段土坝及纵向围堰联接段振冲加固的设计、施工及其效果检测,对试验成果进行论证,表明振冲加固砂基确保大坝砂基稳定在技术上是可行的,试验所选定的施工技术参数和加固效果检测标准是合理的,可用于指导下一阶段大面积坝基振冲加固处理。
Feilaixia Water Conservancy Project dam section of the earth dam is a homogeneous dam, the dam foundation elevation 14m below the un-compacted fill in the sand and natural sand cover. In order to prevent earth-rock liquefaction of earth-dam foundation in riverbed, ensure the sand foundation of earth dam to be stable and reduce the dam foundation settlement, the design is required to vibrate and reinforce the sand layer. In order to obtain reasonable technical parameters of vibro-construction and to ensure smooth construction, field tests were carried out by design and construction units. Through the design, construction and effect test of vibrating and reinforcing of the connecting section between earth-rock dam and longitudinal cofferdam, The results demonstrate that it is technically feasible to strengthen the sand foundation by vibro-impacting to ensure that the sand foundation of the dam is stable. The testing technical parameters and testing standards for the reinforcement effect are reasonable and can be used to guide the large-scale dam foundation vibration Rush reinforcement.