深厚填土区碎石土抗剪性能及桩基力学特性分析

doi:10.3969/j.issn.1674-0696.2022.03.12

重庆交通大学学报（自然科学版） ›› 2022, Vol. 41 ›› Issue (03): 79-86.DOI: 10.3969/j.issn.1674-0696.2022.03.12

深厚填土区碎石土抗剪性能及桩基力学特性分析

王林峰1，程平2，唐宁1，杨柳1，朱航1

(1. 重庆交通大学山区公路水运交通地质减灾重庆市高校市级重点实验室，重庆 400074； 2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都 610059)

收稿日期:2020-09-03 修回日期:2020-10-20 发布日期:2022-03-24
作者简介:王林峰（1983—），男，重庆人，教授，博士，博士生导师，主要从事地质灾害方面的研究。E-mail：wanglinfeng@cqjtu.edu.cn 通信作者：程平（1994—），男，四川万源人，博士研究生，主要从事地质灾害方面的研究。E-mail：2302080303@qq.com
基金资助:
重庆市自然科学基金项目（cstc2020jcyj-msxmX0218）；重庆市教委科技研究项目（KJQN201800706）

Shear Resistance of Gravel Soil and the Mechanical Properties of Pile Foundation in Deep Filling Area

WANG Linfeng1, CHENG Ping2, TANG Ning1, YANG Liu1, ZHU Hang1

(1.Chongqing Municipal Key Laboratory of Highway and Water Transportation, Geological Disaster Reduction in Mountainous Areas, Chongqing Jiaotong University, Chongqing 400074, China; 2. State Key Laboratory of Geohazard Prevention and Geo-environmental Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China)

Received:2020-09-03 Revised:2020-10-20 Published:2022-03-24

摘要/Abstract

摘要： 碎石土作为工程中常见的填土材料，其抗剪性能受含水率和含石量的影响较大。道路建设中以碎石土填料为承载基础的桥梁桩基在荷载作用下的力学特性也受多因素影响。以渝黔高速公路綦江北互通段公路桥梁建设项目为依托，选取施工现场的碎石土材料进行不同含水率和含石量的抗剪性能试验；基于MIDAS/GTS有限元软件建立深厚填土区以碎石土作为填土材料的桩基计算模型。研究结果表明：碎石土体黏聚力随着含水量增加而平缓减小，当含水率超过一定值时，其黏聚力减小较快，内摩擦角也随着含水率的增加而减小；黏聚力随着含石量的增大逐渐减小，内摩擦角则随着含石量增加而增大；先施加堆载造成的桩顶沉降变化幅度小于先施加桩载再施加堆载的变化情况，产生沉降较小的是先施加桩载再堆载最后桩载；桩侧摩阻力的变化规律与加载大小及顺序有关，取决于桩土之间的相对位移。

关键词: 岩土工程；碎石土；抗剪强度；桩基；摩阻力

Abstract: As a common filling material in engineering, the shear properties of gravel soil were greatly affected by water content and stone content. In highway and railway construction, the mechanical properties of bridge pile foundations filling with gravel soil as the bearing foundation were also affected by multiple factors under the action of load. Based on the highway bridge construction project in Qijiangbei interchange section of Chongqing-Guizhou Expressway, the gravelly soil material was taken from the construction site for shear performance tests with different moisture content and stone content. Based on MIDAS/GTS finite element analysis software, the calculation model of pile foundation with gravel soil as filling material in deep filling area was established. The results show that the cohesion of gravel soil firstly decreases gently with the increase of water content, but when the water content exceeds a certain value, the cohesion decreases rapidly, and the angle of internal friction decreases with the increase of water content. The cohesion decreases with the increase of stone content and the angle of internal friction increases with the increase of stone content. The variation range of pile top settlement caused by heap load first is less than that caused by pile load first and then heap load, and the final settlement of pile caused by pile load first and then heap load and last pile load is relatively small. The variation law of pile side friction resistance is related to the loading size and order and depends on the relative displacement between pile and soil.

Key words: geotechnical engineering; gravel soil; the shear strength; pile foundation; frictional resistance

中图分类号:

TU473.1

王林峰1，程平2，唐宁1，杨柳1，朱航1. 深厚填土区碎石土抗剪性能及桩基力学特性分析[J]. 重庆交通大学学报（自然科学版）, 2022, 41(03): 79-86.

WANG Linfeng1, CHENG Ping2, TANG Ning1, YANG Liu1, ZHU Hang1. Shear Resistance of Gravel Soil and the Mechanical Properties of Pile Foundation in Deep Filling Area[J]. Journal of Chongqing Jiaotong University(Natural Science), 2022, 41(03): 79-86.

参考文献

［1］钟祖良，涂义亮，何晓勇，等.土石混合体物理指标及强度特性研究进展［J］.地下空间与工程学报，2016，12(4)：1135-1144.
ZHONG Zuliang, TU Yiliang, HE Xiaoyong, et al.Research progress on physical index and strength characteristics of bimsoils［J］. Chinese Journal of Underground Space
and Engineering, 2016, 12(4): 1135-1144.
［2］许丹.碎石土地基的大型原位水平推剪试验与单环注水试验［J］.科学技术与工程，2018，18(10)：124-129.
XU Dan. Large-scale in-situ horizontal push-shear and constant-head injection test of the gravel soil［J］.Science Technology and Engineering, 2018, 18(10): 124-129.
［3］宋岳，崔超，李江龙.三峡库区滑坡土石混合体剪切强度试验研究［J］.三峡大学学报(自然科学版)，2018，40(5)：27-31.
SONG Yue, CUI Chao, LI Jianglong. Test research on shear strength of soil-rock mixture of landslide in Three Gorges reservoir area［J］.Journal of China Three Gorges
University(Natural Sciences), 2018, 40(5): 27-31.
［4］郭喜峰，晏鄂川，刘洋.三峡库区碎石土滑坡体抗剪强度研究［J］.重庆交通大学学报(自然科学版)，2015，34(1)：68-71.
GUO Xifeng, YAN Echuan, LIU Yang. Shear strength of gravel soil landslide in the Three Gorges Reservoir zone［J］. Journal of Chongqing Jiaotong University(Natural
Science), 2015, 34(1): 68-71.
［5］胡峰，李志清，胡瑞林，等.基于大型直剪试验的土石混合体剪切带变形特征试验研究［J］.岩石力学与工程学报，2018，37(3)：766-778.
HU Feng, LI Zhiqing, HU Ruilin, et al. Research on the defor-mation characteristics of shear band of soil-rock mixture based on large scale direct shear test［J］.Chinese
Journal of Rock Mechanics and Engineering, 2018, 37(3): 766-778.
［6］丁秀丽，李耀旭，王新.基于数字图像的土石混合体力学性质的颗粒流模拟［J］.岩石力学与工程学报，2010，29(3)：477-484.
DING Xiuli, LI Yaoxu, WANG Xin. Particle flow modeling mechanical properties of soil and rock mixtures based on digital image［J］. Chinese Journal of Rock Mechanics
and Engineering, 2010, 29(3): 477-484.
［7］徐文杰，胡瑞林，谭儒蛟，等.虎跳峡龙蟠右岸土石混合体野外试验研究［J］.岩石力学与工程学报，2006，25(6)：1270-1277.
XU Wenjie, HU Ruilin, TAN Rujiao, et al. Study on field test of rock-soil aggregate on right bank of Longpan in Tiger-leaping gorge area［J］. Chinese Journal of Rock
Mechanical and Engineering, 2006, 25(6): 1270-1277.
［8］ SIMONI A, HOULSBY G T. The direct shear strength and dilatancy of sand-gravel mixtures［J］. Geotechnical & Geological Engineering, 2006, 24(3): 523-549.
［9］ MIRGHASEMI A A, ROTHENBURG L, MATYAS E L. Influence of particle shape on engineering properties of assemblies of two-dimensional polygon-shaped particles
［J］. Géotechnique, 2002, 52(3): 209-217.
［10］卢黎，王华飞，胡岱文.含水率和颗粒级配对稍密碎石土抗剪性能及地基承载力的影响［J］.土木建筑与环境工程，2017，39(3)：138-144.
LU Li, WANG Huafei, HU Daiwen. Influence of moisture content and grain composition on shear strength of slightly dense gravel soil and bearing capacity of foundation
［J］.Journal of Civil and Environmental Engineering, 2017, 39(3): 138-144.
［11］裴向军，罗阳楚君，杨晴雯. 含水率及掺砂量对双聚材料改良碎石土性能的影响［J］. 重庆交通大学学报(自然科学版)，2018，37(9)：48-52.
PEI Xiangjun, LUO Yangchujun, YANG Qingwen. Impact of water content and sand content on performance of improved gravel soil with dimeric materials［J］. Journal of
Chongqing Jiaotong University(Natural Science), 2018, 37(9): 48-52.
［12］程麦理.黄土场地桩基横向力学行为数值模拟［J］.工程力学，2019，36(增刊)：229-233.
CHENG Maili. Numerical simulation of transverse mechanical behavior of pile foundation in loess site［J］. Engineering Mechanics, 2019, 36(Sup): 229-233.
［13］刘源，徐同桐，赵宪锋.桩周土含水率对三维碎石桩基承载力影响的实验［J］.成都理工大学学报(自然科学版)，2019，46(2)：249-256.
LIU Yuan, XU Tongtong, ZHAO Xianfeng. Experimental study on influence of soil moisture content in 3D grave pile foundation on its bearing capacity［J］.Journal of
Chengdu University of Technology(Science & Technology Edition), 2019, 46(2): 249-256.
［14］杨剑，黎冰，鲍安琪，等.考虑土性参数空间变异性的单桩竖向承载力分析［J］.水利水运工程学报，2019(5)：85-90.
YANG Jian, LI Bing, BAO Anqi, et al. Analysis of vertical bearing capacity of single pile foundations considering spatial variability of soil parameters［J］. Hydro-Science and
Engineering, 2019(5): 85-90.
［15］交通部公路科学研究院.公路土工试验规程：JTG E40—2007［S］.北京：人民交通出版社，2007.
Research Institute of Highway Ministry of Transport.Test Methods of Soils for Highway Engineering: JTG E40—2007［S］. Beijing: China Communications Press, 2007.
［16］贾喜翠.堆载条件下软弱土地基基桩负摩阻力分布特性研究［D］.兰州：兰州交通大学，2016.
JIA Xicui.Research on the Distribution Characteristic of the Negative Skin Friction of Single Pile in Soft Soil Foundation under Surcharge Load［D］. Lanzhou: Lanzhou
Jiaotong University, 2016.

[1]	杨建群1，许东风2，蔡键1，周洋3. 基于边界元法的隧道掘进对邻近基础影响研究[J]. 重庆交通大学学报（自然科学版）, 2019, 38(04): 35-40.
[2]	杨雄，何忠意，齐昌广. 内力测量新技术在灌注桩试验中的应用研究[J]. 重庆交通大学学报（自然科学版）, 2016, 35(5): 85-91.
[3]	崔江浩. 一种土塞效应的计算方法[J]. 重庆交通大学学报（自然科学版）, 2014, 33(3): 98-101.
[4]	张红军，周世良，杨虎锋. 基于模糊综合评判法和有限元法的超声波测桩评定方法[J]. 重庆交通大学学报（自然科学版）, 2013, 32(3): 429-433.
[5]	戴国亮，刘立基，龚维明，周香琴. 四室井筒式地下连续墙水平承载试验研究[J]. 重庆交通大学学报（自然科学版）, 2012, 31(增1): 655-660.
[6]	许锡宾，周亮，刘涛. 大直径嵌岩桩单桩承载性能的有限元分析[J]. 重庆交通大学学报（自然科学版）, 2010, 29(6): 942-946.
[7]	司文静, 王成. 压弯荷载作用下圆截面混凝土桩的损伤分析[J]. 重庆交通大学学报（自然科学版）, 2008, 27(S1): 892-894.
[8]	赵世航, 许锡宾. 嵌岩桩竖向承载力的探讨[J]. 重庆交通大学学报（自然科学版）, 2008, 27(2): 255-258.
[9]	贾虎. 钻孔灌注桩在滑坡治理中的应用与研究[J]. 重庆交通大学学报（自然科学版）, 2006, 25(增刊1): 89-92.
[10]	陈太瑞. 桩基沉降计算分析及高压旋喷加固研究[J]. 重庆交通大学学报（自然科学版）, 2004, 23(4): 60-63.
[11]	阙云,1 刘明维,1熊国伟2. 基于蒙特卡罗法的抗拔桩可靠度指标分析[J]. 重庆交通大学学报（自然科学版）, 2004, 23(1): 69-72.
[12]	吴恒立. 推力桩非线性全过程分析及控制性设计——综合刚度原理和双参数法[J]. 重庆交通大学学报（自然科学版）, 2001, (S1): 77-82.
[13]	肖广成. 测斜-声波透射法的研究[J]. 重庆交通大学学报（自然科学版）, 2001, (4): 87-88.
[14]	王多银，邢磊，段伦良. 考虑临近道路施工过程的在役桥墩墩顶位移演变规律研究[J]. 重庆交通大学学报（自然科学版）, 2021, 40(10): 82-90.

深厚填土区碎石土抗剪性能及桩基力学特性分析

Shear Resistance of Gravel Soil and the Mechanical Properties of Pile Foundation in Deep Filling Area

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 14

编辑推荐

Metrics