摘要
浅层桩周土的性能对桩体水平承载力有很大影响,通过加固桩周土来提高桩体水平承载力是一种经济有效的手段,但目前国内其研究甚少。通过现场全尺度水平加载试验来研究、分析高压旋喷桩加固后灌注桩在软土中的水平静力加载性能,为进一步动力计算提供前提条件和基本依据。试验结果表明:将延深度5倍和7.5倍D(D为灌注桩桩径)范围内的土体进行高压旋喷桩加固后,灌注桩水平承载力分别提高了2/3和1倍,且其桩身弯矩显著下降,从而大大提高了旋喷桩的抗开裂性能,保证桩体能在较大水平作用力下截面混凝土不发生开裂。
Properties of soil around piles at shallow level show great influences on horizontal carrying capacity of pile bodies, and reinforcement of soil around piles to improve horizontal carrying capacity of pile bodies is an economical and effective way, but at present studies on it are very few at home. This paper studies and analyzes horizontal static loading properties of pouring piles in soft soil after reinforcement by high - pressure jet pouring piles via site full - scale horizontal loading test to provide preconditions and essential bases for further dynamic calculation. The test results show that after soil mass which extension is 5 and 7.5 times the D （ D is diameter of pouring piles） is reinforced by high - pressure jet pouring piles, the horizontal carrying capacity of pouring piles is increased by 2/3 and 1 time respectively, and the bending moment of pile bodies decreases remarkably so as to anti - crack performance of jet pouring piles greatly and guarantee that sectional concrete of pile bodies does not crack at large horizontal action force.
出处
《公路交通技术》
2015年第5期48-52,共5页
Technology of Highway and Transport
关键词
旋喷桩
加固
水平静载
原位试验
jet pouring pile
reinforcement
horizontal static load
in situ test
