Monitoring and Analysis on Composite Support System with Soil-Nailing Wall-pile Anchor-inner Bracing(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年04期
- Page:
- 120-126
- Research Field:
- Publishing date:
Info
- Title:
- Monitoring and Analysis on Composite Support System with Soil-Nailing Wall-pile Anchor-inner Bracing
- Author(s):
- SONG Jian-xue; LI Li-jian; TONG Yuan-tong
- School of Civil Engineering, Zhengzhou University
- Keywords:
- foundation engineering; horizontal displacement; field measurement; numerical simulation; composite support; soil nailing wall; pile anchor
- PACS:
- -
- DOI:
- -
- Abstract:
- The field measurement of the whole construction process of a deep foundation pit engineering in Zhengzhou city was carried out. Through analysis of monitoring data such as the horizontal displacement of slope top and top beam, deep horizontal displacement of support pile, the horizontal displacement law of composite support system with soil nailing wallpile anchor-inner bracing was studied. Combined with the engineering example, the finite element model was established, the measured data and numerical analysis results were compared to verify the applicability of model parameters, and then the influences of inner bracing position, anchor lock value on the deformation of support structure were summarized. The results show that the horizontal displacement of slope top is mainly controlled by the upper soil nailing wall in the composite support system with soil nailing wall-pile anchor-inner bracing. The deep horizontal displacement curve of the support pile in this system is generally “P” shape, and the maximum displacement occurs near the inner bracing, which is produced before forming strength of reinforced concrete inner bracing. As the elevation of inner bracing moves upward, the maximum displacement of pile moves towards the bottom of foundation pit. In the composite support system, the determination of the elevation of inner bracing should be based on the location of protected objects outside the foundation pit. With the increase of anchor lock value, the maximum horizontal displacement position of pile body moves down and the maximum horizontal displacement decreases. When the engineering geological condition of the site is better, the horizontal displacement of support structure can be controlled by increasing the anchor lock value appropriately.
Last Update: 2018-07-18