夯实水泥土桩复合地基载荷试验及数值模拟

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摘要夯实水泥土桩复合地基处理技术已得到了广泛的应用,然而其设计理论和计算方法却严重滞后,主要借鉴水泥土搅拌桩的计算理论和方法。载荷试验目前是确定地基承载力的主要方法,但试验存在许多如工期长、费用高等问题。鉴于上述问题,利用通用的有限元计算软件 ABAQUS ,并进行二次开发,采用南水双屈服面土体本构模型和增量加载数值计算方法,模拟载荷试验,并与夯实水泥土桩的现场载荷试验比较,载荷曲线与沉降曲线基本吻合,结果表明,只要土体力学参数与实际工程情况一致,载荷试验结果可以通过数值计算来获取。

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	司海宝
	肖昭然

关键词 ：载荷试验, 土体本构, 增量加载, 地基承载力

Abstract：The processing technology for composite foundation with compacted cement-soil piles has been widely utilized. Nonetheless, the related design theory and calculation method seem out of date, which usually refers to the counterparts for cement-soil mixing piles. Loading tests are the primary method to determine the bearing capacity of foundation recently, while there’re some undesirable problems with regard to the tests such as the long experiment term. Considering these issues, the secondary development is made in this study on the ABAQUS platform, and the NHRI model and incremental loading numerical calculation method are adopted to simulate the actual loading test. A comparison between the results from in-site loading tests and numerical simulation is made. The loading curves and settlement curves are in agreement. A conclusion is drawn: the results of actual loading tests can be obtained from numerical simulation as long as the mechanical parameters of soil adopted in numerical simulation are consistent with those in the actual projects.

Key words： loading test constitutive model step-loading bearing capacity

收稿日期: 2011-08-22

TU472

基金资助:国家自然科学基金项目( 50978086)

作者简介: 司海宝 (1974 – ) ,男,安徽安庆人,讲师,博士研究生,从事工程数值计算等研究工作。

引用本文:

司海宝, 肖昭然. 夯实水泥土桩复合地基载荷试验及数值模拟[J]. 岩土工程学报, 2011, 33(sup2): 480-484. SI Hai-bao, XIAO Zhao-ran . Loading tests on composite foundation with compacted cement-soil piles and numerical simulation. Chinese J. Geot. Eng., 2011, 33(sup2): 480-484.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Isup2/480

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