tailieunhanh - Phát triển lý thuyết áp lực đất C.A Coulomb cho đất dính: Bảng tra sẵn các hệ số không thứ nguyên

Bài viết trình bày sự phát triển lý thuyết áp lực đất Coulomb cho đất dính, điều kiện sản sinh các loại áp lực đất, lập biểu thức giải tích cho áp lực chủ động và bị động, lập bảng tính các hệ số áp lực đất dính. | PHÁT TRIỂN LÝ THUYẾT ÁP LỰC ĐẤT COULOMB CHO ĐẤT DÍNH. BẢNG TRA SẴN CÁC HỆ SỐ KHÔNG THỨ NGUYÊN NGUYỄN CÔNG MẪN NGUYỄN CÔNG THẮNG Coulomb s theory for cohesive soils. Referenced tables for non- dimensional coefficients Abstract Coulomb 1773 made the following assumptions in the development of his theory - When the soil is in critical equilibrium state active or passive the failure wedge is a rigid body consisting of failure surface generated in the soil mass and the second failure surface is the contiguous surface between the soil and the retaining wall. - The active pressure of the soil is equal to the maximum of the thrust values Ed of the soil on the wall and the passive pressure due to the soil compression is equal to the smallest of the anti-force values Ech of soil onto the wall. The author calls these propositions the rule of Maximum and Minimum. - To solve the problem using theoretical mechanical tools but with the cohesive backfill this method still faces many difficulties and often has to be solved mainly by polygon of forces. Based on the two basic assumptions mentioned above of Coulomb s theory this paper introduces two established trigonometric quadratic equations for the relation Ecđ f 1 and Ebđ g 2 where Ecđ and Ebđ are active forces and passive forces on walls respectively 1 2 are the corresponding sliding rising angles to facilitate the calculation of necessary parameters when calculating soil pressure on retaining walls. H. 3 . The results of this study have been made available as a spreadsheet for parameters corresponding to cases that may be common in the design of retaining walls. The TCVN 9152 2012 Hydraulic structures - Designing Process for Retaining Walls has been structured according to the standards of designing retaining walls of hydraulic works - TCXD 57-73 with HDTL-C-4-76 updated in 2003 which stated The author s new research results are in section of the Appendix. Although there are some examples in this standard that .