土工基础

›› 2017, Vol. 31 ›› Issue (3): 369-371.

• 工程实录 • 上一篇    下一篇

PHS预应力混凝土空心方桩对桩间土挤密效应试验研究

席文勇1，秦秀娟2，蔺泓瑞1   

  1. （1.山东电力工程咨询院有限公司,济南 250100;2.山东黄河勘测设计研究院，济南 250100）
  • 收稿日期:2017-03-04 修回日期:2017-03-13 出版日期:2017-06-25 发布日期:2017-06-26
  • 作者简介:席文勇(1981-)，男，工程师，研究方向为地基处理与测试技术等。

Experimental Study on the Compaction Effect of Hollow Prestressed Reinforced Concrete Square Piles in Soils

XI Wenyong1, Qin Xiujuan2, LIN Hongrui1   

  1. (1.Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan 250100;
    2.Shandong Yellow River Reconnaissance Design & Research Institute, Jinan 250100)
  • Received:2017-03-04 Revised:2017-03-13 Online:2017-06-25 Published:2017-06-26

摘要： 依托工程实例，通过对打桩前后桩间土的物理力学性质指标、标准贯入试验的对比分析，研究了PHS预应力混凝土空心方桩对桩间土的挤密效应。试验表明，挤密效应可消除地基土液化，使桩间土的工程性质得到明显改善，提高强度，降低压缩性。桩间土的物理力学指标、标准贯入试验指标较打桩前均有不同程度的提高。挤密效应对粉土、砂土较为敏感，粘性土相对较弱。挤密效应与桩间土的粘粒含量、塑性指数呈负相关，粘粒含量、塑性指数越大，挤密效应越弱。

关键词: 心方桩, 挤密效应, 液化

Abstract: This paper presents a case study of the effect of the compactive efforts in soil induced by hollow prestressed reinforced concrete piles. The physical and mechanical properties of soils and Standard Penetration Test (SPT) numbers before and after the pile installations are compared. The test results indicate that the installation of these piles can effectively eliminate the liquefaction potential and improve the engineering properties of the soil among piles. The strength of the soil and the SPT N values increase and the compressibility decreases after the pile installation. The results also show that more compactive effects can be found in silty and sandy soils than that of clayey soils. The compactive effective is also reversely correlated with the clay content in soils, plastic indices.

Key words: Hollow Square Concrete Piles, Compactive Effect, Liquefaction