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为研究土的基本性质,验证土的本构关系,监测建筑岩土结构,进行了以下5方面的研究:①土的次弹性本构模型和弹黏塑模型;②一维应变黏性土沉降计算;③一维应变下黏性土非线性蠕变和压缩;④双室三轴装置、真三轴加载装置、非饱和土–结构界面直剪装置和土钉抗拔箱等试验技术的研发;⑤岩土结构光纤监测技术研发。研究结果表明:①次弹型模型较合理地描述土的非线性应力–应变关系和重要的剪应力产生剪胀或剪缩和平均应力产生偏应变(或剪应变);②等效时间得到的蠕变率适合任何加载历史或路径。土的蠕变率只与土的应力–应变状态点有关,与如何到达该点的过去的历史或者路径无关;③一维弹黏塑性模型是严格推导出来的非线性流变模型,适合任何加载条件和状态;④假设A方法低估了沉降,逻辑上是错的;假设B方法是对的,但用非线性流变模型的耦合固结分析不方便使用,由此提出了一基于假设B的简化方法,可适合各种应力–应变状态和加载–卸载–再加载情况;⑤一个有极限的非线性函数很适合土的非线性蠕变和非线性压缩;⑥刚柔结合的真三轴加载装置很好地解决了加载干扰问题和土样应力–应变不均问题,直剪仪可测非饱和土与结构界面的强度参数,土钉抗拔箱可控制可监测多种参数,可用于研究土钉在多种条件下的抗拔力及其机理;⑦两种光纤技术有其优点,可用于岩土结构监测。
In order to study the basic properties of soil, verify the constitutive relationship of soil and monitor the geotechnical structure of the soil, the following five aspects are studied: (1) the sub-elastic constitutive model of soil and elastic-viscoplastic model; (2) Calculation; ③ non-linear creep and compression of cohesive soil under one-dimensional strain; ④ research and development of test technologies such as double-chamber triaxial device, true triaxial loading device, direct shear device of unsaturated soil-structure interface and soil nailing anti- ; ⑤ geotechnical fiber optic monitoring technology research and development. The results show that: (1) The secondary elastic model is more reasonable to describe the nonlinear stress-strain relationship of soil and the de-shearing or shear-shrinking of the important shear stress and the average stress to produce the partial strain (or shear strain); ② The equivalent time Creep rate suitable for any loading history or path. Soil creep rate is only related to soil stress-strain state point, and has nothing to do with the past history or path to reach the point; ③ One-dimensional elastic viscoplastic model is strictly derived nonlinear rheological model, suitable for any load Conditions and conditions; ④ Assumptions A method underestimates the subsidence, is logically wrong; B method is assumed to be right, but with non-linear rheological model of the coupling consolidation analysis is not easy to use, thus proposed a based on the assumption B A simplified method suitable for all kinds of stress-strain states and loading-unloading-reloading conditions; ⑤ a nonlinear function with a limit is very suitable for nonlinear creep and nonlinear compression of soil; ⑥ rigid-flexible combined true triaxial loading The device solves the problem of load disturbance and soil stress-strain unevenness well. The direct shear device can measure the strength parameters of unsaturated soil and structural interface. The soil nailing anti-pulling box can control and monitor various parameters and can be used for research Soil nail in a variety of conditions, the anti-pull force and its mechanism; ⑦ two kinds of optical fiber technology has its advantages, can be used for rock and soil structure monitoring.