By Ruwan Abey Rajapakse
Geotechnical Engineering Calculations handbook bargains geotechnical, civil and structural engineers a concise, easy-to-understand technique the formulation and calculation tools utilized in of soil and geotechnical engineering. A one cease consultant to the root layout, pile origin layout, earth preserving constructions, soil stabilization suggestions and software program, this publication areas calculations for the majority elements of geotechnical engineering at your finger counsel. during this ebook, theories is defined in a nutshell after which the calculation is gifted and solved in an illustrated, step by step style. All calculations are supplied in either fps and SI devices. The handbook contains themes reminiscent of shallow foundations, deep foundations, earth preserving constructions, rock mechanics and tunnelling. during this e-book, the author's performed all of the heavy number-crunching for you, so that you get speedy, ready-to-apply info on actions akin to: challenging floor tunnelling, tender flooring tunnelling, strengthened earth protecting partitions, geotechnical elements of wetland mitigation and geotechnical facets of landfill design.
. Easy-to-understand technique the formulation and calculations
. Covers calculations for foundation,earthworks and/or pavement subgrades
. Provides universal codes for operating with laptop software
. All calculations are supplied in either US and SI devices
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1 Hatakanda and Uchida Equation After conducting numerous tests, Hatakanda and Uchida (1996) derived the following equation to compute the friction angle using the SPT (N) values. 3 where = friction angle N = SPT value This equation ignores particle size. Most tests are done on medium to coarse sands. 85 Fine sand Medium sand Coarse sand Source: Bowles (2004). angle while coarse sands will h a v e a larger friction angle. H e n c e t h e following modified e q u a t i o n s are proposed. 1 Find the friction angle of fine sand w i t h an SPT (N) value of 15.
The maxim u m torque achieved is recorded. 9 At failure, the torque reduces and reaches a constant value. This value refers to the remolded shear strength. See Fig. 24. 24 Torque vs. time curve 21 Chapter 1 Site Investigation and Soil Conditions The cohesion of clay is given by T- c x Jr x ( d 2 h / 2 + d3/6) where T= c= d= h= torque (measured) cohesion of the clay layer width of vanes height of vanes The cohesion of the clay layer is obtained by using the m a x i m u m torque. The remolded cohesion was obtained by using the torque at failure.
18 m m ) " 2 0 % r e t a i n e d in sieve n o . 80. t o t a l r e t a i n e d so far - 20 + 25 + 20 - 6 5 % percent passed - 100- 65 - 3 5 % 9 Sieve n o . 075 r a m ) : 3 0 % r e t a i n e d in sieve n o . 200. t o t a l r e t a i n e d so f a r - 20 + 25 + 20 + 3 0 - p e r c e n t p a s s e d t h r o u g h sieve n o . 2 0 0 - 1 0 0 - 95% 95 - 5 % N o w it is p o s s i b l e to d r a w a g r a p h i n d i c a t i n g p e r c e n t p a s s i n g at e a c h sieve, as s h o w n in Fig. 31. 31 Percent passing vs.