关键词: JPP 桩, 模型试验, 分段组合, 水平承载力, 桩身弯矩

Abstract: Jet grouting soil-cement-pile strengthened pile (JPP for short) is a new type pile which is composite of jet grouting pile and prestressed concrete core pile, and achieving the powerful effect of rigid pile and low cost of flexible pile. JPP pile is used in excavation protection and other engineering, but its research on horizontal bearing behavior falls behind the engineering practice. In order to study the horizontal bearing behaviors of different combinations JPP pile, horizontal load model tests are carried out by using the home-made model test pile loading system. The test results show that: sub-portfolio II carries maximum capacity, combined with the sub-portfolio I close, under combination carries the lowest capacity level, so the more sub-portfolio combination shows that the overall horizontal bearing capacity appears. Maximum moment of JPP pile occurs at the position of 3 to 4 times diameter under core pile top and this site is relatively weak and prone to damage. So we can conclude that the soil characteristics within a certain depth below the soil surface will have a direct impact on the horizontal bearing capacity.

Key words: JPP pile, model test, segment combination, horizontal bearing capacity, pile moment