- Email: [email protected]
Parameter determination for soft clay foundations
348A content has a significant influence on soil behaviour, a high content being associated with lower void ratio and higher undrained shear strength and sensitivity.
data is discussed. Stability analysis and settlement prediction for a revetment at Banjarmasin harbour, using CPT strength data, are described.
926069 Parameter determination for soft clay foundations Ohta, H; Nishihara, A
926073 Advanced method for determining strength of clay Tsuchida, T; Mizukami, J
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P51-56. Publ Japan: Coastal Development
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P105-110. Publ Japan: Coastal Development
Institute o f Technology, 1991
Institute of Technology, 1991
Mechanical properties of clay soils are influenced by water content and change as pore water migrates through a soil mass. Parameter determination for finite element analysis of the soil-water coupled problems related to foundations is discussed. Parameters from various triaxial tests, corrections of unconfined compressive strength, parameters from field vane tests, and their relation to the stress states during foundation construction and loading are considered.
Unconfined compression strength is an easily measured parameter for input to stability analysis, but the value obtained is highly dependent on sampling quality. A method is presented to estimate sample quality by comparison of a mean value of qu with a triaxial compressive strength. It is illustrated for so-called undisturbed samples of soft clay taken at depths 50-400m from Osaka Bay. The proposed method indicated the samples were grade 3, i.e. large disturbance has occurred.
926070 Sensitivity and strength anisotropy of Soft Ariake Clay Onitsuka, K; Taesiri, Y
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P63-68. Publ Japan: Coastal Development Institute Of Technology, 1991 The Soft Ariake Clay from around the shores of the Ariake Sea, Kyushu, is extremely sensitive because of high water content plus low salinity as a result of leaching. Sensitivity measured in the laboratory is in the range 50-300, while that from field vane tests is 3-7. Shear strength anisotropy has been estimated from tests using rectangular and diamond shaped blades and a relation between shear strength and blade geometry has been developed. Failure analysis of an embankment of this material indicates shear strength on the slip plane is some 25% less than that outside the slip plane.
926071 Strength properties of clay by portable unconfined compression apparatus Shogaki, T
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P85-88. Publ Japan." Coastal Development Institute of Technology, 1991 A new transportable unconfined compression test device is presented, which is suitable for field use. Based on analysis of extensive laboratory data for clays, it is concluded that shear strength, in the engineering sense, is little affected by initial porosity or specimen height:diameter ratio for specimens of diameter 15-35mm. By execution of the UCT immediately after sampling, disturbance which occurs during transportation and storage is avoided.
926072 Evaluation of engineering properties of Banjarmasin clay, Indonesia Subagio, H Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokabama, 3-6 September 1991 P93-98. Publ Japan. Coastal Development Institute ~[ Technology. 1991 Soft marine clays of coastal Indonesia show low shear strength and high compressibility. A procedure to characterise these soils, in particular mobilised shear strength and its anisotropy and strain rate dependence and the preconsolidation pressure, is presented. Correlation between laboratory values and CPT c
926074 Engineering properties of coastal soil in Okinawa Islands Yamagata, N; Takagaki, Y; Nakano, T; Matsuzaki, T
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokabama, 3-6 September 1991 PIll-116. Publ Japan. Coastal Derelopmem Institute o f Technology. 1991 Coral soils are widespread in the Okinawa Prefecture and cause many geotechnical problems. A program to characterisc these soils is described. Two major groupings were found: sandy (less than 40% fines fraction) and cohesive (silt and clay content 20-40%). Undrained strengths from unconfined compression or UU triaxial tests underestimate observed shear strength, and CU triaxial tests are suggested to obtain design values. Tamping and vibratory compaction are suitable soil improvement techniques, particularly where silt and clay content is below 20%.
926075 Studies on the correlation between the effect of confining pressure and the physical and mechanical properties of weak intercalations Nie Dexin; Zhang Xiangong; Han Wenfen Proc 6tb International Congress International Association o f
Engineering Geology, Amsterdam, 6-10 August 1990 V4. P2473-2479. Publ Rotterdam. A A Balkema. 1990 The behaviour of weak intercalations is one of the main lactors influencing the behaviour of the rock mass which contains them. Fault gouge samples from 7 locations in China have been examined in the laboratory. Good correlations arc seen between confining pressure and shear strength, void ratio, and dry bulk density. This indicates that the naturally occurring normal stress across a discontinuity with weak filling will control its mechanical behaviour.
926076 Effect of cement grout on fractured Vindhyachai sandstone Srivastava, R K: Jalota, A V, Amir, A A A: Rao, K S Proc 6tb International Congress International Association ~
Engineering Geology, Amsterdam, 6-10 August 1990 V4. P2533-2539. Publ Rotterdam." A A Balkema, 1990 A study was carried out under controlled conditions ~o examine effects of grouting on geomechanical properties ~)1 sandstone. Cores were prepared with planar joints, filled with 3mm of cement-sand grout or unfilled, at a range of angles to the axis. Triaxial tests were carried out on these specimens at confining pressures up to 10MPa. Effects of grouting and of
1992 Pergamon Press Ltd. Reproduction not permitted
data is discussed. Stability analysis and settlement prediction for a revetment at Banjarmasin harbour, using CPT strength data, are described.
926069 Parameter determination for soft clay foundations Ohta, H; Nishihara, A
926073 Advanced method for determining strength of clay Tsuchida, T; Mizukami, J
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P51-56. Publ Japan: Coastal Development
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P105-110. Publ Japan: Coastal Development
Institute o f Technology, 1991
Institute of Technology, 1991
Mechanical properties of clay soils are influenced by water content and change as pore water migrates through a soil mass. Parameter determination for finite element analysis of the soil-water coupled problems related to foundations is discussed. Parameters from various triaxial tests, corrections of unconfined compressive strength, parameters from field vane tests, and their relation to the stress states during foundation construction and loading are considered.
Unconfined compression strength is an easily measured parameter for input to stability analysis, but the value obtained is highly dependent on sampling quality. A method is presented to estimate sample quality by comparison of a mean value of qu with a triaxial compressive strength. It is illustrated for so-called undisturbed samples of soft clay taken at depths 50-400m from Osaka Bay. The proposed method indicated the samples were grade 3, i.e. large disturbance has occurred.
926070 Sensitivity and strength anisotropy of Soft Ariake Clay Onitsuka, K; Taesiri, Y
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P63-68. Publ Japan: Coastal Development Institute Of Technology, 1991 The Soft Ariake Clay from around the shores of the Ariake Sea, Kyushu, is extremely sensitive because of high water content plus low salinity as a result of leaching. Sensitivity measured in the laboratory is in the range 50-300, while that from field vane tests is 3-7. Shear strength anisotropy has been estimated from tests using rectangular and diamond shaped blades and a relation between shear strength and blade geometry has been developed. Failure analysis of an embankment of this material indicates shear strength on the slip plane is some 25% less than that outside the slip plane.
926071 Strength properties of clay by portable unconfined compression apparatus Shogaki, T
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 P85-88. Publ Japan." Coastal Development Institute of Technology, 1991 A new transportable unconfined compression test device is presented, which is suitable for field use. Based on analysis of extensive laboratory data for clays, it is concluded that shear strength, in the engineering sense, is little affected by initial porosity or specimen height:diameter ratio for specimens of diameter 15-35mm. By execution of the UCT immediately after sampling, disturbance which occurs during transportation and storage is avoided.
926072 Evaluation of engineering properties of Banjarmasin clay, Indonesia Subagio, H Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokabama, 3-6 September 1991 P93-98. Publ Japan. Coastal Development Institute ~[ Technology. 1991 Soft marine clays of coastal Indonesia show low shear strength and high compressibility. A procedure to characterise these soils, in particular mobilised shear strength and its anisotropy and strain rate dependence and the preconsolidation pressure, is presented. Correlation between laboratory values and CPT c
926074 Engineering properties of coastal soil in Okinawa Islands Yamagata, N; Takagaki, Y; Nakano, T; Matsuzaki, T
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokabama, 3-6 September 1991 PIll-116. Publ Japan. Coastal Derelopmem Institute o f Technology. 1991 Coral soils are widespread in the Okinawa Prefecture and cause many geotechnical problems. A program to characterisc these soils is described. Two major groupings were found: sandy (less than 40% fines fraction) and cohesive (silt and clay content 20-40%). Undrained strengths from unconfined compression or UU triaxial tests underestimate observed shear strength, and CU triaxial tests are suggested to obtain design values. Tamping and vibratory compaction are suitable soil improvement techniques, particularly where silt and clay content is below 20%.
926075 Studies on the correlation between the effect of confining pressure and the physical and mechanical properties of weak intercalations Nie Dexin; Zhang Xiangong; Han Wenfen Proc 6tb International Congress International Association o f
Engineering Geology, Amsterdam, 6-10 August 1990 V4. P2473-2479. Publ Rotterdam. A A Balkema. 1990 The behaviour of weak intercalations is one of the main lactors influencing the behaviour of the rock mass which contains them. Fault gouge samples from 7 locations in China have been examined in the laboratory. Good correlations arc seen between confining pressure and shear strength, void ratio, and dry bulk density. This indicates that the naturally occurring normal stress across a discontinuity with weak filling will control its mechanical behaviour.
926076 Effect of cement grout on fractured Vindhyachai sandstone Srivastava, R K: Jalota, A V, Amir, A A A: Rao, K S Proc 6tb International Congress International Association ~
Engineering Geology, Amsterdam, 6-10 August 1990 V4. P2533-2539. Publ Rotterdam." A A Balkema, 1990 A study was carried out under controlled conditions ~o examine effects of grouting on geomechanical properties ~)1 sandstone. Cores were prepared with planar joints, filled with 3mm of cement-sand grout or unfilled, at a range of angles to the axis. Triaxial tests were carried out on these specimens at confining pressures up to 10MPa. Effects of grouting and of
1992 Pergamon Press Ltd. Reproduction not permitted