摘要
关于复合加载条件下裙板式基础稳定性研究中,传统方法都是将基础底面中心作为荷载参考点,从而导致裙板式基础的破坏包络面形状非常复杂,而且依赖于埋深与宽度之比。为了得到能够适用于一定埋深比范围的统一破坏包络面方程,建议了一种裙板式基础最优荷载参考点的搜索方法,并将之在有限元软件ABAQUS中予以数值实施。基于最优荷载参考点,联合采用swipe加载和固定位移比加载两种方法,所得到的归一化破坏包络面可以近似为力矩–水平荷载空间内的椭圆。进而提出了双参数的统一破坏包络面方程,该方程可以用于估计正常固结软黏土地基上裙板式基础的稳定性。对于工程上常用的裙板式基础埋深比,还给出了方程中的参数取值范围。通过与有关离心模型试验结果的对比分析,在一定程度上验证了本文所提出的破坏包络面方程的合理性。
The shape of failure envelope for skirted foundations under combined loading is complex and strongly dependent on embedment ratio when the traditional load reference point, i.e., the base center, is utilized. To overcome the difficulty to obtain a closed-form equation to describe the shapes of failure envelopes for skirted foundations with a range of embedment ratios, an efficient searching procedure for the optimal load reference point is suggested and implemented in the finite element package ABAQUS. Using the optimal load reference point, the failure envelope obtained through combining swipe loading and fixed displacement ratio probing can be approximated as an ellipse in normalized moment-horizontal load space. Then a unified double parameter equation is proposed, which can be utilized to estimate the combined capacity of skirted foundations in normally consolidated clay within practically acceptable accuracy. The values of the two parameters are also presented for a range of practical embedment ratios. The rationality of the proposed equation is validated by comparing the present solutions with the experimental data from a given centrifuge model test.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第10期1917-1924,共8页
Chinese Journal of Geotechnical Engineering
基金
National Natural Science Foundation of China (50909048)
Shandong Provincial Natural Science Foundation of China (ZR2010EQ036)
Project of Shandong Province Higher Educational Science and Technology Program(J12LG01)
Open Foundation of State Key Laboratory of Coastal and Offshore Engineering(LP1215)
关键词
承载力
裙板式基础
复合加载
破坏包络面
荷载参考点
bearing capacity
skirted foundation
combined loading
failure envelope
load reference point
