基于散体材料性质的土石混填路基压实度快速检测方法

发布时间：2018-12-24 13:29

【摘要】：基于静力贯入试验检测土石混填路基压实度是目前实现压实度快速检测的有效方法,但其检测原理有待深入研究,因此,首先基于现有散体材料应力传递机制的研究,假设应力在路基土石混合料中以曲线圆锥的形式向下扩散传递,建立适合土石混填路基散体材料的应力分析方法,其次,基于孔隙介质力学理论,建立变形模量、泊松比及孔隙率随路基变形而变化的规律,并引入分层总和法及分级加载思想,建立土石混填路基荷载沉降分析模型即P-s解析关系,然后,结合路基静力贯入试验测得的P-s试验曲线,利用自适应模拟退火优化方法反演获得路基初始孔隙率,从而建立基于散体材料性质的土石混填路基压实度快速检测方法,该方法避免了繁琐的标定试验,且检测精度可满足工程要求,最后,通过现场实测结果以及本文与现有方法分析结果的比较分析,表明了提出方法的合理性与可行性。
[Abstract]:It is an effective method to detect compaction degree of soil-rock mixed filling subgrade based on static penetration test, but its principle needs to be studied deeply. Therefore, firstly, the stress transfer mechanism of bulk material is studied. Assuming that the stress is diffused down in the form of curve cones in the soil-rock mixture of roadbed, a stress analysis method suitable for the soil-rock mixed subgrade bulk material is established. Secondly, based on the mechanics theory of pore medium, the deformation modulus is established. The law of Poisson's ratio and porosity changing with the deformation of roadbed, and introducing the layered summation method and the idea of graded loading, the analytical model of load and settlement of soil-rock mixed filling subgrade is established, which is called P-s analytic relation, and then, Combined with the P-s test curve measured by static penetration test of roadbed, the initial porosity of roadbed was obtained by using adaptive simulated annealing optimization method, and a rapid method for measuring compaction of soil-rock mixed subgrade was established based on the properties of bulk materials. The method avoids the tedious calibration test, and the accuracy of the method can meet the engineering requirements. Finally, the rationality and feasibility of the proposed method are demonstrated through the comparison of the field measured results and the analysis results of this paper and the existing methods.
【作者单位】：湖南大学岩土工程研究所;长沙理工大学水利工程学院;
【基金】：国家自然科学基金资助项目(51378198,51508039) 高等学校博士学科点专项科研基金项目(20130161110017)~~
【分类号】：U416.1

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