岩土工程中的几个问题

介绍多年来在工作中遇到的，对岩土工程有普遍意义的３个问题：①长江中下游片状砂的工程特性，它与石英质砂有较大差异，原来建立在石英砂研究基础上的一些经验，不完全适用于片状砂；②深基础的临界深度；③载荷板承载力的尺寸效应。承载力中的临界深度和尺寸效应现象，并非传统土力学理论所能解释，尚待进一步研究探讨。为此，笔者建议应加强土的基本性质和基础工程性状的试验研究，为土力学理论的发展和实践提供科学依据。

Some cases in geotechnical engineering

In this paper, three cases have been presented that may have general meaning in geotechnical engineering: (1) The engineering properties of schistous sands along middle and lower Yangtze river valley. They are quite different from that of silicious sands, so that those experiences based on the research works of silicious sands can not be applied to them without modification. (2) The “critical depth” of deep foundation. (3) The “scale effect” of loading plate testing. The phenomena of critical depth and scale effect of bearing capacity problems could not be explained with traditional soil mechanics theory. The author suggests that it must be emphasized to enhance the fundamental research works on the engineering properties of regional soils and on the behaviour of the foundation in soil layers. It will provide the scientific bases for the development of soil mechanics theory and practice.