摘要
太沙基(Terzaghi)创立土力学理论已近百年,但土力学的两个最基本的问题也是工程设计应用最广的内容:地基沉降计算和承载力合理确定还没有很好的解决,以致土力学被称为是一门半理论半经验的“艺术”科学。问题的根源是什么?如何突破?能使理论更接近实际一点吗?这里介绍我们所做的一些工作和思考,就是分析沉降计算不准的原因是由于室内土样试验获得的参数与现场原位土试验获得的参数差异大,同时通常的沉降计算方法难以考虑土体应力水平产生的侧向变形引起的非线性沉降。建议对硬土地基采用原位压板试验建立的切线模量法计算地基的沉降,可以解决原位土参数和应力非线性的问题,对软土主要是解决应力非线性问题。对合理确定地基承载力,应该计算实际基础的荷载沉降曲线,由基础的荷载沉降曲线,用强度和变形双控的方法,才能合理的确定地基的承载力。希望抛砖引玉,共同努力,推进学科发展。
Terzaghi has founded the theory of soil mechanics for nearly a hundred years, but the two most basic problems of soil mechanics are also the most widely used contents of engineering design, calculation of foundation settlement and reasonable determination of bearing capacity, have not been solved very well, so that the soil Mechanics is called a semi-theoretical and semi-experienced "art" science.What is the root of the problem? How to break through? Can the theory be closer to the reality? Here are some of the work and thoughts we have done.The reason why the settlement calculation is not accurate is because the parameters obtained by the indoor soil sample tests are different from those obtained by the in-situ soil tests.At the same time, the usual settlement calculation method is difficult to consider the nonlinear settlement caused by the lateral deformation caused by the soil stress level.The settlement of the foundation is proposed to be calculated by the tangent modulus method established by the in-situ plate loading test on the hard soil foundation, which can solve the problem of in-situ soil parameters and stress nonlinearity, and solve the stress nonlinear problem mainly for soft soils.In order to reasonably determine the bearing capacity of foundation, the load-settlement curve of actual foundation should be calculated, and the bearing capacity of foundations can be reasonably determined only by the load-settlement curve of foundation and the double-control method of strength and deformation.We hope that we can make joint efforts to promote the development of disciplines.
作者
杨光华
YANG Guang-hua(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510610,China;The Geotechnical EngineeringTechnology Center of Guangdong Province,Guangzhou 510610,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2019年第10期1893-1898,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51778152,51378131)
关键词
沉降计算
切线模量法
地基承载力
settlement calculation
tangent modulus method
foundation bearing capacity
