岩土地基自重应力相关问题的探讨

RESEARCH ON SOME PROBLEMS ABOUT GRAVITY STRESS OF ROCK OR SOIL FOUNDATION

通过对容重、天然孔隙比和固结沉降量等岩土物理、力学性质指标随深度或自重应力变化而变化的规律的分析,探讨了岩土内部自重应力场的分布规律。结合工程现场荷载试验,并应用Hoek-Brown强度准则,讨论了砂砾软岩极限承载能力及自重应力对其极限承载能力的有利影响。结果表明,地壳浅层的岩土自重应力场分布复杂,并存在构造应力场。

Based on the analyses of relations of physical and mechanical behavior indexes of rocks or soils,such as the variation of bulk density,natural void ratio and consolidation settlement along with depth or gravity stress,the laws of deadweight stress field of rock and soil are discussed.The bearing capacity of foundation of soft glutenite and the favorable effect of gravity stress on the bearing capacity are analyzed by using field loading test in a hydraulic project and Hoek-Brown strength criterion.The results show that distribution of gravity stress is complex,and tectonic stress field exists in shallow layers of the earth crust.