摘要
通过选择甘肃省瓜州县风电场盐渍土地基进行天然条件和浸水条件下静力载荷试验,来研究风电场区域盐渍土地基在附加应力作用下的变形变化特征。试验结果表明,甘肃河西地区分布的盐渍土,在天然状态下承载力较高,可作为天然的地基。浸水后,地层中的细粒物质被冲蚀和盐分被溶蚀均可引起地基的沉降。作为持力层的密实砾砂层是否发生溶陷与地层中盐分含量密切相关,地层中如未见明显盐分结晶时,其溶陷量较小;地层中有明显盐分晶体富集时,易引起较大的溶陷,这部分地层作为地基时需要处理。风电场区因缺水,不宜进行大规模预浸水处理地基。建议场区地基的处理采用密实法和置换垫层法,结合场地周围砾石等粗粒土较多的实际情况,将地基中含盐地层挖除,回填以含盐较少砾石土压密。
Through static load tests under natural conditions and soaking conditions on the saline soil foundation of the wind farm in Kuazhou County of Gansu Province, the deformation characteristics of saline soil foundation in the wind farm zone under the action of additional stress are studied. The test results show that the saline soil distributed in Gansu Hexi Prefecture has high bearing capacity under natural conditions and can be used as natural foundation. After soaking, the erosion of fine materials and dissolving of salt may cause foundation settlement. Whether the dense gravel sand layer, as a bearing layer, has collapsibility is closely related with the saline density of the stratum. If no obvi- ous salt crystallization appears, the collapsibility is less; if there is rich salt crystallization, it easily causes great collapsibility, and this part of stratum must be treated if used as foundation. Because of water shortage in the wind farm, a large scale foundation treatment by soaking is not advisable. It is suggested that the compaction method and replacement cushion method be applied for treatment of the wind farm foundation. Because there are a lot of gravels and coarse soils around the wind farm, the saline soil layer in the foundation shall be removed and backfilled with saline less-salt gravelly soil and compacted.
出处
《西北水电》
2011年第6期75-80,共6页
Northwest Hydropower
关键词
风电场
静力载荷试验
盐渍土
地基处理
wind farm
static load test
saline soil
foundation treatment
