Q2、Q3黄土深堑中高填方地基变形规律离心模型试验研究

doi:10.16285/j.rsm.2015.12.018

›› 2015, Vol. 36 ›› Issue (12): 3473-3481.doi: 10.16285/j.rsm.2015.12.018

Q2、Q3黄土深堑中高填方地基变形规律离心模型试验研究

梅源¹，胡长明¹，魏弋峰²，张文萃¹，袁一力¹，王雪艳^{1, 3}

1.西安建筑科技大学土木工程学院，陕西西安 710055；2.中国民航机场建设集团公司，北京 100101； 3.西安工程大学环境与化学工程学院陕西西安 710048

收稿日期:2015-02-11 出版日期:2015-12-11 发布日期:2018-06-14
作者简介:梅源，男，1983年生，博士，讲师，主要从事岩土力学及工程技术方向的研究工作。
基金资助:
国家自然科学基金资助项目（No. 51408463）；陕西省教育厅专项科研计划项目（No. 15JK1413）；西安建筑科技大学科技计划项目（No. RC1375）；西安建筑科技大学科技项目（No. QN1409）。

A centrifugal test study of the deformation of high backfill foundation in deep ravine of Q2 and Q3 loess

MEI Yuan¹, HU Chang-ming¹, WEI Yi-feng², ZHANG Wen-cui¹, YUAN Yi-li¹, Wang Xue-yan^1,3

1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China; 2. China Airport Construction Group Corporation of CAAC, Beijing 100101, China； 3. College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China

Received:2015-02-11 Online:2015-12-11 Published:2018-06-14
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51408463), Special Research Project of Education Department of Shaanxi Provincial Government(Grant No. 15JK1413), Science and Technology Plan Projects of Xi’an University of Architecture and Technology(Grant No. RC1375) and Science and Technology Project of Xi’an University of Architecture and Technology（Grant No. QN1409）.

摘要/Abstract

摘要： 采用大尺寸原状黄土与重塑黄土联合制作模型，针对Q2、Q3黄土深堑中超高填方地基在天然含水率及饱和状态时的沉降变形规律开展大型离心模型试验研究，系统模拟了超高黄土填方地基在施工期及工后期的变形规律。结果表明：此类高填方地基的施工期沉降变形是总变形量主要组成部分；地基填筑完毕后表面沉槽轮廓清晰，填筑过程中沉降速率随施工填方高度增加而增大，沉降变形中部大、两侧小，且填方体与原地基结合部位的变形缓坡较陡坡一侧小；天然状态下的地基整体沉降变形较小，差异变形量较大，饱和状态下的地基沉降变形增大，差异变形量较小，稳定性较差，差异变形使得原地基与填方体极易发生错动开裂。根据模型试验的分析规律，建议此类地基施工过程中宜对填方体与原地基接触带进行处理，以改善填方体约束条件，同时，填筑完工前可预留一定高度，待前期变形基本完成后，再施工至设计标高，以防止过大差异变形导致的工后开裂。

关键词: 土力学, 湿陷性黄土, 离心模型试验, 高填方地基, 沉降变形, 原状黄土

Abstract: The settlement of high backfill foundation in deep ravine of Q2 and Q3 loess under natural moisture content and saturated conditions was investigated based on the centrifuge testing. A large-scale centrifugal model test was carried out to simulate the behaviors of the high backfill foundation in its construction and post-construction periods. In this test, the intact loess and disturbed loess were selected as testing materials. It is shown that the settlement deformation of the high backfill foundation mainly occurs in the construction period, and the settlement rate increases with the filling height. After the test, the settlement trough can be clearly seen on the top of the foundation. The maximum settlement occurs in the middle of the filling body. The deformation on the gentle slope with the joint of the filling body and the original foundation is smaller than that on the steep slope. Under the natural moisture content, the total settlement is small, whereas the differential settlement is large. In contrast, the deformation under the saturated condition shows different characteristics, and the foundation is less stable. Differential settlements can yield a rupture between the original foundation and the filling body, so that the joint zone needs special treatments during construction period to improve the constraint of the filling body. It is suggested here that a certain reserved height of the filling body should be determined by the end of the filling process, and then measures must be taken to avoid the post-construction cracking owing to large differential settlement deformation.

Key words: soil mechanics, collapsible loess, centrifugal model test, high backfill foundation, settlement deformation, intact loess

中图分类号:

TU 478

梅源，胡长明，魏弋峰，张文萃，袁一力，王雪艳 , . Q2、Q3黄土深堑中高填方地基变形规律离心模型试验研究[J]. , 2015, 36(12): 3473-3481.

MEI Yuan , HU Chang-ming , WEI Yi-feng , ZHANG Wen-cui , YUAN Yi-li , Wang Xue-yan , . A centrifugal test study of the deformation of high backfill foundation in deep ravine of Q2 and Q3 loess[J]. , 2015, 36(12): 3473-3481.

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Q2、Q3黄土深堑中高填方地基变形规律离心模型试验研究

A centrifugal test study of the deformation of high backfill foundation in deep ravine of Q2 and Q3 loess

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