摘要
研究土的力学性质是对岩土工程和环境工程有着非常的重要的意义。在20世纪20年代 Terzaghi 的《土力学》著作的问世，正式标志着这门土力学新学科的诞生。在20世纪中期复苏了非饱和土力学研究的是对土力学发展中有着具有长远影响意义的事件。在岩土工程中所遇到的土绝大数处于非饱和状态，饱和状态的极为稀少，在探究非饱和土的工程性质已经成为20世纪90年代以来全世界土力学研究的问题热点之一。土的一个非常重要力学性质是土的抗剪强度，土的抗剪强度是否能准确的测定，往往是工程成败和设计质量的关键所在。虽然Mohr-Coulomb 提出的强度理论可以对饱和土的抗剪强度非常准确的测定，这早已经被实验以及工程实践所证实，但是在 20 世纪中期以前对岩土工程的测量一直都的应用的是饱和土的 Mohr-Coulomb提出的强度公式来应用非饱和土的抗剪强度，并非探究出非饱和土独有的计算抗剪强度理论公式。
随着20世纪中期以后对非饱和土力学和饱和土力学的研究逐步复苏和深入，国内外通过实验研究非饱和土的抗剪强度有许多学者总结出了各自的非饱和土抗剪强度理论和公式，并且越来越多的应用到岩土工程和实践中。本文主要以实验为基础，在加载速率对非饱和土强度影响方面做一些探索研究工作。
关键词：非饱和土 抗剪强度
Summary
Studying the mechanical properties of soil is of great significance to geotechnical engineering and environmental engineering. The publication of Terzaghi#39;s book Soil Mechanics in the 1920s officially marked the birth of this new discipline of soil mechanics. Unsaturated soil mechanics was revived in the middle of the 20th century. It is an event that has a long-term impact on the development of soil mechanics. The vast majority of soils encountered in geotechnical engineering are in unsaturated state, and the saturated state is extremely rare. Exploring the engineering properties of unsaturated soils has become one of the hot issues in soil mechanics research worldwide since the 1990s. A very important mechanical property of soil is the shear strength of soil. Whether the shear strength of soil can be accurately measured is often the key to the success of the project and the design quality. Although the strength theory proposed by Mohr-Coulomb can measure the shear strength of saturated soil very accurately, which has long been confirmed by experiments and engineering practice, the strength formula proposed by Mohr-Coulomb of saturated soil has been applied to geotechnical engineering measurement until the middle of the 20th century to apply the shear strength of unsaturated soil, instead of exploring the unique theoretical formula for calculating the shear strength of unsaturated soil.
With the gradual recovery and deepening of the research on unsaturated soil mechanics and saturated soil mechanics since the middle of the 20th century, many scholars at home and abroad have summarized their respective theories and formulas of unsaturated soil shear strength through experimental research on unsaturated soil shear strength, and more and more have been applied to geotechnical engineering and practice. This paper is mainly based on experiments and does some exploratory research work on the influence of loading rate on the strength of unsaturated soil.
Key words:Unsaturated soil Shear strength
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