土工基础

›› 2012, Vol. 26 ›› Issue (4): 112-115.

• 工程实录 • 上一篇    下一篇

砂卵石地层桩锚支护结构现场实测与研究

李红梅,钱 霄,赵小庆   

  1. 成都兴蜀勘察基础工程公司，成都 610072
  • 收稿日期:2012-04-25 出版日期:2012-08-20 发布日期:2012-09-07
  • 作者简介:李红梅（1982-），女，四川德阳人，本科（助理工程师），研究方向为深基坑支护设计及施工技术。

Field Measurements of PileAnchor Supporting Structures in Sandy Cobble Soils in Chengdu

LI Hongmei, QIAN Xiao, ZHAO Xiaoqing   

  1. Chengdu Xingshu Exploration & Foundation Engineering Co., Ltd, Chengdu 610072
  • Received:2012-04-25 Online:2012-08-20 Published:2012-09-07

摘要： 对成都市某楼的深基坑桩锚支护结构进行现场监测,研究分析了砂卵石地层条件下深基坑开挖过程中土压力、桩身内力、锚杆拉力的分布和变化规律。研究表明：桩侧静止土压力约占理论静止土压力的1/6~1/10，开挖过程对冠梁与底板附近的土压力影响较小；桩体钢筋应力仅发挥了钢筋设计强度的16.8%；预应力锚杆只出现了前期预应力损失等，为今后成都地区的桩锚支护结构的研究提供了较好的参考价值。

关键词: 砂卵石层, 桩锚支护结构, 现场监测

Abstract: The case history of a deep excavation using a pileanchor supporting system is presented in this paper. The excavation support system was constructed in sandy cobble soils and was instrumented. The earth pressures, the stress in the piles and the tension force in the anchors were monitored during the excavation. The results indicated that the earth pressures acting on the piles were only 1/6 to 1/10 of the atrest earth pressure. The excavation depth had minor impact on the steel wales. The stress recorded in the pile rebar was only 16.8% of the design strength. The stress loss in the prestressed anchors was observed immediately after the pretension. These data provide valuable information for similar deep excavations in the Chengdu area.

Key words: Sandy Cobbles, PileAnchor Supporting Structures, Filed Measurements