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張清華¹， 楊益洪¹， 何雪蓮¹， 翁麗婭²
（1 溫州市建筑設(shè)計(jì)研究院，溫州 325003； 2 溫州市勘察測繪研究院，溫州 325027）
   
[摘要] 結(jié)合實(shí)際工程，對(duì)嵌入卵石層鉆孔灌注樁后壓漿設(shè)計(jì)、施工中后壓漿方法的選擇、注漿量的確定、后壓漿樁的承載力計(jì)算、后壓漿在超長樁中的應(yīng)用等進(jìn)行了研究。試驗(yàn)結(jié)果表明，采用后壓漿時(shí)應(yīng)選用樁底注漿，樁底后壓漿的注漿量與樁徑的平方成正比；后壓漿樁端承載力可按預(yù)制樁的樁端承載力進(jìn)行計(jì)算；后壓漿對(duì)超長樁的承載力和沉降均有較大改善。
[關(guān)鍵詞] 卵石層；鉆孔灌注樁；后壓漿；注漿量；超長樁

Some problems about post-grouting design of bored pile inserted to boulder bed in soft foundation
Zhang Qinghua¹, Yang Yihong¹, He Xuelian¹, Weng Liya²
(1 Wenzhou Architectural Design and Research histitute, Wenzhou 325003, China;  2 Wenzhou Geotechnical Investigation and Mapping Institute, Wenzhou 325027, China)
   
Abstract: Based on actual projects, it carries out research on the choice of post-grouting method, grouting quantity and bearing capacity of bored pile, and the application of post-grouting in superlong pile. The experiments show that grouting under the bottom of the pile is preferred when using post-grouting, and the grouting quantity is in direct proportion to square of the diameter of the pile. The carrying capacity of the bottom of the post-grouting can be calculated according to the carrying capacity of the bottom of the prefab pile, and post-grouting can geatly improve the carrying capacity and settlement of the super-long pile.
Keywords: boulder bed; bored pile; post-grouting;  grouting quantity;  super-long pile