毛乌素沙漠风积砂力学特性及复合地基承载力试验研究
摘要
在对毛乌素沙漠自然地理及地质环境条件进行全面研究的基础上,基于一系列试验和测试手段,对毛乌素沙漠风积砂的级配特点、微结构、密度、含水量等物理特性及压缩特性、击实特性、强度特性等岩土力学性质进行了研究,同时探讨了不同密度条件下土水特征曲线的滞回特性及其变化趋势,并对毛乌素风积砂的渗透性进行了测定,研究了渗透系数与密度的变化关系,为有限元数值模拟计算提供了相关计算参数。
在对常规应力路径应力-应变-强度关系进行研究的基础上,通过改进常规三轴试验设备实现了三轴拉伸应力路径试验,并对该应力路径下应力-应变-强度关系进行了研究,通过相关试验数据确定了D-C非线弹性本构模型和剑桥本构模型的相关参数,为基于这两种本构模型的毛乌素沙漠风积砂工程数值计算提供了相关参数。
开展了毛乌素沙漠风积砂基于状态的弹塑性本构及其相关的本构参数研究。从毛乌素沙漠风积砂变形特性入手,首先研究了毛乌素沙漠风积砂的状态,并确定了相关模型参数,然后围绕基于状态的风积砂剪胀本构模型理论验证了本构模型。以不同应力路径下的三轴试验结果为基础,模拟了毛乌素沙漠风积砂在不同应力路径下的变形特性,并与试验结果进行比较,探讨了不同应力路径状态下该模型的适用性以及存在的问题。
在固结不排水(CU)和固结排水(CD)动三轴试验基础上,对毛乌素沙漠风积砂的动力特性进行了研究。对相关动力参数和动强度特性及其影响因素进行了分析,并在此基础上建立了毛乌素沙漠风积砂的等效黏弹性本构和残余应变模型,获取了等效强度参数,并在此基础上建立了等效摩尔库伦强度判据。为毛乌素沙漠风积砂地基在动荷载作用下的变形、强度计算和场地液化势判别提供了试验和理论依据及可供工程直接应用的模型和参数。
开展了毛乌素沙漠风积砂地基承载力试验工作,研究了毛乌素沙漠风积砂地基的持力特性；针对毛乌素沙漠风积砂地层碎石桩、砂桩及水泥搅拌桩桩体及复合地基的极限承载力开展了大量原位载荷试验及测试等工作,同时研究了桩体复合地基桩土荷载分担特性及单桩有效桩长,为毛乌素沙漠风积砂地基的设计和施工实践提供了重要的试验依据。
Based on the comprehensive study of natural geographical and geological conditions of Mu Us Desert, and a series of tests and test means, this paper studies such physical properties of Mu Us Desert eolian sands as grading characteristics, microstructure, density and water content, and also such rock-soil mechanical properties as compression, compaction and strength. At the same time, this paper discusses the hysteretic properties and change trends of soil-water characteristic curves under different density conditions, measures the permeability of Mu Us eolian sand, studies the changing relationship between osmotic coefficient and density, and provides relevant calculation parameters for the numerical simulation calculation of finite element.
On the basis of studying the stress-strain-strength relationship under the conventional stress paths, this paper realizes the triaxial stretching stress path test by improving the conventional triaxial test apparatus. In this paper, relevant parameters of D-C non-linear elastic constitutive model and constitutive model of Cambridge have been determined through relevant test data after the study of stress-strain-strength relationship under the stress path, which provides relevant parameters for the numerical calculation of Mu Us Desert eolian sand project based on the two constitutive models above.
This paper studies the state-based elastoplastic constitutive and related constitutive parameters concerning the Mu Us Desert eolian sand. Starting with the introduction of deformation property of Mu Us Desert eolian sand, this paper first studies its state and determines relevant model parameters, then verifies the constitutive model by focusing on the state-based constitutive model theory of eolian sand dilatancy. Based on the triaxial test results under different stress paths, this paper simulates the deformation properties of Mu Us desert eolian sand under different stress paths, and compares them with experimental results, discussing the applicability of this model and existing problems under different stress paths.
On the basis of consolidated undrained (CU) and consolidated drained (CD) dynamic triaxial tests, dynamic characteristics of Mu Us Desert eolian sand are studied. Based on the analysis of relevant dynamic parameters, dynamic strength properties and influence factors, this paper establishes the equivalent viscoelastic constitutive and residual strain model of Mu Us Desert eolian sand, obtains the equivalent strength parameters, and makes the criterion for equivalent Mohr-Coulomb strength. This paper provides experimental and theoretical basis, models and parameters directly for engineering applications for the deformation of Mu Us Desert eolian sand foundation under dynamic loads, strength calculation, and site liquefaction potential discrimination.
This paper carries out the work of testing the bearing capacity of Mu Us Desert eolian sand foundation, and studies its bearing properties. Aiming at the ultimate bearing capacity of gravel piles, sand piles and cement mixing pile bodies on the Mu Us Desert eolian sand layer, and that of composite foundation, this paper carries out lots of in situ load tests and testing work, and equally studying the characteristics of load sharing between piles and soils of pile-body composite foundation, and effective length of single pile, which provides an important test basis for the design and construction of Mu Us Desert eolian sand foundation.
在对常规应力路径应力-应变-强度关系进行研究的基础上,通过改进常规三轴试验设备实现了三轴拉伸应力路径试验,并对该应力路径下应力-应变-强度关系进行了研究,通过相关试验数据确定了D-C非线弹性本构模型和剑桥本构模型的相关参数,为基于这两种本构模型的毛乌素沙漠风积砂工程数值计算提供了相关参数。
开展了毛乌素沙漠风积砂基于状态的弹塑性本构及其相关的本构参数研究。从毛乌素沙漠风积砂变形特性入手,首先研究了毛乌素沙漠风积砂的状态,并确定了相关模型参数,然后围绕基于状态的风积砂剪胀本构模型理论验证了本构模型。以不同应力路径下的三轴试验结果为基础,模拟了毛乌素沙漠风积砂在不同应力路径下的变形特性,并与试验结果进行比较,探讨了不同应力路径状态下该模型的适用性以及存在的问题。
在固结不排水(CU)和固结排水(CD)动三轴试验基础上,对毛乌素沙漠风积砂的动力特性进行了研究。对相关动力参数和动强度特性及其影响因素进行了分析,并在此基础上建立了毛乌素沙漠风积砂的等效黏弹性本构和残余应变模型,获取了等效强度参数,并在此基础上建立了等效摩尔库伦强度判据。为毛乌素沙漠风积砂地基在动荷载作用下的变形、强度计算和场地液化势判别提供了试验和理论依据及可供工程直接应用的模型和参数。
开展了毛乌素沙漠风积砂地基承载力试验工作,研究了毛乌素沙漠风积砂地基的持力特性；针对毛乌素沙漠风积砂地层碎石桩、砂桩及水泥搅拌桩桩体及复合地基的极限承载力开展了大量原位载荷试验及测试等工作,同时研究了桩体复合地基桩土荷载分担特性及单桩有效桩长,为毛乌素沙漠风积砂地基的设计和施工实践提供了重要的试验依据。
Based on the comprehensive study of natural geographical and geological conditions of Mu Us Desert, and a series of tests and test means, this paper studies such physical properties of Mu Us Desert eolian sands as grading characteristics, microstructure, density and water content, and also such rock-soil mechanical properties as compression, compaction and strength. At the same time, this paper discusses the hysteretic properties and change trends of soil-water characteristic curves under different density conditions, measures the permeability of Mu Us eolian sand, studies the changing relationship between osmotic coefficient and density, and provides relevant calculation parameters for the numerical simulation calculation of finite element.
On the basis of studying the stress-strain-strength relationship under the conventional stress paths, this paper realizes the triaxial stretching stress path test by improving the conventional triaxial test apparatus. In this paper, relevant parameters of D-C non-linear elastic constitutive model and constitutive model of Cambridge have been determined through relevant test data after the study of stress-strain-strength relationship under the stress path, which provides relevant parameters for the numerical calculation of Mu Us Desert eolian sand project based on the two constitutive models above.
This paper studies the state-based elastoplastic constitutive and related constitutive parameters concerning the Mu Us Desert eolian sand. Starting with the introduction of deformation property of Mu Us Desert eolian sand, this paper first studies its state and determines relevant model parameters, then verifies the constitutive model by focusing on the state-based constitutive model theory of eolian sand dilatancy. Based on the triaxial test results under different stress paths, this paper simulates the deformation properties of Mu Us desert eolian sand under different stress paths, and compares them with experimental results, discussing the applicability of this model and existing problems under different stress paths.
On the basis of consolidated undrained (CU) and consolidated drained (CD) dynamic triaxial tests, dynamic characteristics of Mu Us Desert eolian sand are studied. Based on the analysis of relevant dynamic parameters, dynamic strength properties and influence factors, this paper establishes the equivalent viscoelastic constitutive and residual strain model of Mu Us Desert eolian sand, obtains the equivalent strength parameters, and makes the criterion for equivalent Mohr-Coulomb strength. This paper provides experimental and theoretical basis, models and parameters directly for engineering applications for the deformation of Mu Us Desert eolian sand foundation under dynamic loads, strength calculation, and site liquefaction potential discrimination.
This paper carries out the work of testing the bearing capacity of Mu Us Desert eolian sand foundation, and studies its bearing properties. Aiming at the ultimate bearing capacity of gravel piles, sand piles and cement mixing pile bodies on the Mu Us Desert eolian sand layer, and that of composite foundation, this paper carries out lots of in situ load tests and testing work, and equally studying the characteristics of load sharing between piles and soils of pile-body composite foundation, and effective length of single pile, which provides an important test basis for the design and construction of Mu Us Desert eolian sand foundation.
引文
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