联合板索基础抗拔机理及容许上拔力
2016-11-30雒亿平邓骁言志信
雒亿平 邓骁 言志信



摘 要:针对目前使用的既抗压又抗拔基础存在的缺陷和不足,构建了联合板索基础并获得了发明专利授权。在研究联合板索基础与扩底桩基础的抗拔机理基础上,研究了联合板索基础与扩底桩基础所能承受的极限上拔力,通过联合板索基础与扩底桩基础的对比研究,揭示了联合板索基础的抗拔机理,并借助扩底桩基础的上拔力容许设计值和稳定验算公式,解决了联合板索基础设计和稳定验算问题。
关键词:板索基础;联合基础;抗拔机理;上拔力
中图分类号:TU470.3
文献标志码:A文章编号:1674-4764(2016)05-0085-05
Abstract:A joint plate cable foundation is established and offered patent of invention to improve the deficiencies of present widely used compression and pulling resistant foundation. Based on the study of anti-tensile mechanism of joint plate cable foundation and belled pile foundation, the ultimate uplift force that the joint plate cable foundation and belled pile foundation can bear is further analyzed. The anti-tensile mechanism of the joint plate cable foundation is revealed through comparatively studying the joint plate cable foundation and belled pile foundation. The issue of designing and verifying the joint plate cable foundation is solved by using the allowable uplift force and the stability verification equation of the belled pile foundation, which provides theoretical and technical support to the promotion of such kind of foundation.
Keywords:plate cable foundation; joint foundation; anti-tensile mechanism; uplift force
在基础设施建设中,上部结构的理论已较为成熟,设计思想和理念已较为先进,工程施工也已积累了较丰富的经验并不断得到发展。然而,地基基础的研究相对滞后,以致于工程建设中时常出现基础尺寸大,费用高昂,且造成材料浪费和环境破坏的情况,开发新型基础型式已成为满足工程建设需要的紧迫问题。近年来很多研究人员围绕探索造价低、可靠度高、施工简便可行的基础型式而不懈努力[1]。
“大开挖”基础、“掏挖扩底”基础为现今主要使用的既抗压又抗拔的基础型式。“大开挖”基础以扰动的回填土构成抗拔土体保持基础的上拔稳定,由于是回填土,虽经夯实亦难以恢复其原有土的结构强度,主要靠扩大基础尺寸来满足抗拔稳定性,但是加大基础尺寸会提高基础造价和工程成本,同时,由于弃土较多,也对环境造成较大破坏。……
