圆形煤场中桩-网复合地基原体试验研究

›› 2011, Vol. 32 ›› Issue (2): 487-494.

圆形煤场中桩-网复合地基原体试验研究

戴洪军^{1, 2}，刘欣良²，任治军²，韦华²

1.东南大学土木工程学院，南京 210096；2.江苏省电力设计院，南京 211102

收稿日期:2010-01-08 出版日期:2011-02-10 发布日期:2011-02-16
作者简介:戴洪军，男，1970年生，博士研究生，高级工程师，注册岩土、造价、监理工程师，主要从事电力岩土工程咨询工作。

Prototype testing study of pile-net composite foundation of circular coal yard

DAI Hong-jun ^{1, 2}, LIU Xin-liang², REN Zhi-jun², WEI Hua²

1.School of Civil Engineering, Southeast University, Nanjing 210096, China; 2.Jiangsu Province Electric Power Design Institute, Nanjing 211102, China

Received:2010-01-08 Online:2011-02-10 Published:2011-02-16

摘要/Abstract

摘要：

在大型圆形煤场中采用桩-网复合地基是火电厂地基方案设计的新思路，该方案不仅要考虑地基土层的强度满足上部荷载的要求，还需要考虑堆载区内土体的变形对环基的影响。通过对圆形煤场中桩-网复合地基原体试验研究，介绍了在大面积堆载下如何进行桩、土及垫层中应力与应变的测试，设计了2套堆载与测试方案，在试验1区铺设了2层土工格栅，而在试验2区未铺设土工格栅。根据在2个试验区所获得的测试成果，研究了大面积堆载对堆载区内外土体变形的影响深度与范围，对比分析了不同高程处垫层与土体的竖向及侧向应力随深度的变化规律，结合堆载区中桩与边桩的桩身轴力变化，计算出上部桩侧土体对桩所产生的负摩阻力，并依据承台顶面附近测得的垫层与土层的应力，计算出桩土分担荷载的比例，以及桩土应力比的大小与变化规律。在此基础上得到土工格栅对大面积堆载区内外土体应变与应力的影响程度，从而可以为大型圆形煤场桩-网复合地基方案的设计与施工提供客观的技术参数与建议。

关键词: PHC桩, 土工格栅, 桩-网复合地基, 桩土应力比, 圆形煤场

Abstract:

It is a new idea to adopt pile-net composite foundation for circular coal yard in fossil power plants, while not only certain soil strength is required to bear the upper load, but also the influence of soil deformation in load area on ring foundation shall be taken into account. Through prototype test and study on pile-net composite foundation of circular coal yard, this paper gives an introduction to that how to test stress and strain of pile, soil and cushion under large-area load. During the process, two loading and testing schemes were designed, while two layers of geogrids were arranged in test zone 1 and no geogrids in test zone 2. Based on the test results of two test zones, the paper investigates the depth and range of influence of large-area load on soil deformation inside and outside the load area, and analyzes the variation principle of vertical and lateral stress of cushion and soil in different elevations. Then combining with the change of pile axial force of middle pile and boarder pile in load area, the negative friction of upper soil is calculated. According to the stress of cushion and soil near the cap table, the pile-soil load sharing ratio and stress ratio are computed. Therefore the effects of geogrids on stress and strain of soil inside and outside the load area are deduced to provide objective technical parameters and suggestions on the design and construction of pile-net composite foundation of circular coal yard.

Key words: PHC pile, geogrids, pile-net composite foundation, pile-soil stress ratio, circular coal yard

中图分类号:

TD 79

戴洪军，刘欣良，任治军，韦华. 圆形煤场中桩-网复合地基原体试验研究[J]. , 2011, 32(2): 487-494.

DAI Hong-jun, LIU Xin-liang, REN Zhi-jun, WEI Hua. Prototype testing study of pile-net composite foundation of circular coal yard[J]. , 2011, 32(2): 487-494.

参考文献

相关文章 15

[1]	黄宇华, 徐林荣, 周俊杰, 蔡雨, . 基于改进Terzarghi方法的桩网地基桩土应力计算[J]. 岩土力学, 2020, 41(2): 667-675.
[2]	尹锋, 周航, 刘汉龙, 楚剑, . 车辆载重与动荷载对X形桩桩-网复合地基动力特性影响的试验研究[J]. 岩土力学, 2019, 40(4): 1324-1330.
[3]	王家全, 张亮亮, 赖毅, 陆梦梁, 叶斌, . 加筋土挡墙静动力学特性大模型试验研究[J]. 岩土力学, 2019, 40(2): 497-505.
[4]	刘方成, 吴孟桃, 杨峻, . 土工格栅加筋橡胶砂强度特性试验研究[J]. 岩土力学, 2019, 40(2): 580-591.
[5]	王家全, 徐良杰, 黄世斌, 刘政权. 动载下土工格栅加筋桥台挡墙承载性能分析[J]. 岩土力学, 2019, 40(11): 4220-4228.
[6]	汪益敏，闫岑，于恒，李奇. 静载作用下土工格栅加筋拓宽路堤土中应力特征试验研究[J]. , 2018, 39(S1): 311-317.
[7]	姜文雨, 刘一, . 刚性桩复合地基中性面深度与桩土应力比计算[J]. 岩土力学, 2018, 39(12): 4554-4560.
[8]	王家全，张亮亮，刘政权，周圆兀. 土工格栅加筋砂土地基大模型动载试验研究[J]. , 2018, 39(10): 3539-3547.
[9]	李连祥，黄佳佳，符庆宏，成晓阳，胡峰, . 不同置换率复合地基力学性状附加荷载影响规律离心试验研究[J]. , 2017, 38(S1): 131-139.
[10]	王志杰，Felix Jacobs，Martin Ziegler，. 土工格栅横肋对加筋砾石强度与变形特性的影响[J]. , 2017, 38(8): 2234-2240.
[11]	唐晓松，郑颖人，王永甫，冯雨实，. 关于土工格栅合理网孔尺寸的研究[J]. , 2017, 38(6): 1583-1588.
[12]	王家全，周岳富，唐咸远，黄世斌，. 可视大模型加筋土直剪数采仪的研发与应用[J]. , 2017, 38(5): 1533-1540.
[13]	郑俊杰，曹文昭，周燕君，江金国. 三向土工格栅筋-土界面特性拉拔试验研究[J]. , 2017, 38(2): 317-324.
[14]	沈才华，王媛，李鹤文，胡玉田，. 基于扩孔理论的挤密砂桩复合地基桩土应力比计算方法[J]. , 2017, 38(10): 2873-2880.
[15]	陈俊，符文熹，戴峰，邓建辉. 用于填筑路堤加固的竹筋格栅力学性能[J]. , 2017, 38(1): 174-179.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed