The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

T S Nagaraj - One of the best experts on this subject based on the ideXlab platform.

  • Engineering Behavior of cement stabilized clay at high water content
    Soils and Foundations, 2001
    Co-Authors: Norihiko Miura, Suksun Horpibulsuk, T S Nagaraj
    Abstract:

    The in-situ deep mixing technique has been established as a means to effect columnar inclusions into soft ground to enhance the bearing capacity and reduce settlement. Since the inception of this method, developments in the plant and machinery, as well as associated field techniques, have surpassed the basic understanding of strength developments in high water-content clays admixed with cementing agents.In this paper an attempt is made to identify the critical factors governing the Engineering Behavior of cement-stabilized clay, which helps not only to control the input of cementing agent to attain strength development with curing time and clay water content, but also to understand the subsequent Engineering Behavior. It is revealed that the clay-water/cement ratio, $wc/ c$ is the prime parameter for the above purposes .

  • TROPICAL CLAYS. II: Engineering Behavior
    Journal of Geotechnical Engineering, 1993
    Co-Authors: N. S. Pandian, T S Nagaraj, G. L. Sivakumar Babu
    Abstract:

    The general impression with tropical soils showing changes in plasticity characteristics upon drying is that the compressibility decreases, and shear strength and permeability increase with drying. The study reported in this paper within the frame work of generalized state parameter approach shows that these observations, in a general sense, need be treated with caution. Drying causes a reduction in the overall potential represented by liquid limit leading to a reduction in void ratio for equilibrium under a given load such that the same pore structure exists when equilibrium condition is reached. This means the permeability coefficients do not increase with drying under a given load but considerable settlement occurs. Further, due to the reduction in void ratio, under a given external loading, being commensurate with the reduction in liquid limit due to drying, shear strength also does not increase with drying.

B R Phanikumar - One of the best experts on this subject based on the ideXlab platform.

  • Engineering Behavior of a remolded expansive clay blended with lime calcium chloride and rice husk ash
    Journal of Materials in Civil Engineering, 2008
    Co-Authors: B R Phanikumar, Radhey S Sharma
    Abstract:

    This paper presents experimental results obtained from tests conducted on remolded expansive soil specimens blended with rice-husk ash (RHA) and stabilized with lime and calcium chloride. The amounts of RHA, lime, and calcium chloride were varied from 0 to 16%, 0 to 5%, and 0 to 2%, respectively, by dry weight of the soil. The effect of additives on unconfined compressive strength (UCS) and California bearing ratio (CBR) is reported. It was found that the stress-strain Behavior of expansive clay improved upon the addition of up to 5% lime or up to 1% calcium chloride. A maximum improvement in failure stress of 225 and 328% was observed at 4% lime and 1% calcium chloride, respectively. A RHA content of 12% was found to be the optimum with regard to both UCS and CBR in the presence of either lime or calcium chloride. An optimum content of 4% in the case of lime and 1% in the case of calcium chloride was observed even in clay-RHA mixes.

  • granular pile anchor foundation gpaf system for improving the Engineering Behavior of expansive clay beds
    Geotechnical Testing Journal, 2004
    Co-Authors: B R Phanikumar, R S Sharma, M R Madhav
    Abstract:

    Several innovative foundation techniques have been suggested for reducing detrimental heave of foundations in expansive clays. This paper presents another innovative technique in the form of a granular pile anchor-foundation (GPAF) system for arresting heave and for improving the overall Engineering Behavior of expansive clay beds. In the GPAF system, the foundation is anchored at the bottom of the granular pile to an anchor plate through an anchor rod. As a result, heave of the foundation is reduced. The lab model tests using this new concept of the GPAF system revealed that the heave of the expansive clay beds was reduced by about 96%. The development of final heave was faster in the case of the expansive clay beds reinforced with the GPAF system. Undrained strength of the clay surrounding the granular pile anchor improved by about 20%. The tests on 2-group granular pile anchors indicated that heave was reduced to a minimum value when the spacing between the granular pile anchors was kept at twice the pile diameter. The compressive load response of the expansive clay bed reinforced with granular pile anchors also improved. The pull-out load of the granular pile anchors increased with increasing diameter and the relative density of the pile.

Norihiko Miura - One of the best experts on this subject based on the ideXlab platform.

  • Engineering Behavior of cement stabilized clay at high water content
    Soils and Foundations, 2001
    Co-Authors: Norihiko Miura, Suksun Horpibulsuk, T S Nagaraj
    Abstract:

    The in-situ deep mixing technique has been established as a means to effect columnar inclusions into soft ground to enhance the bearing capacity and reduce settlement. Since the inception of this method, developments in the plant and machinery, as well as associated field techniques, have surpassed the basic understanding of strength developments in high water-content clays admixed with cementing agents.In this paper an attempt is made to identify the critical factors governing the Engineering Behavior of cement-stabilized clay, which helps not only to control the input of cementing agent to attain strength development with curing time and clay water content, but also to understand the subsequent Engineering Behavior. It is revealed that the clay-water/cement ratio, $wc/ c$ is the prime parameter for the above purposes .

Justin P Milburn - One of the best experts on this subject based on the ideXlab platform.

  • Engineering Behavior of stabilized soils
    Transportation Research Record, 2003
    Co-Authors: Robert L Parsons, Justin P Milburn
    Abstract:

    Stabilization of soils is an effective method for improving soil properties and pavement system performance. For many soils, more than one stabilization agent may be effective, and financial considerations or availability may be the determining factor on which to use. A series of tests was conducted to evaluate the relative performance of lime, cement, Class C fly ash, and an enzymatic stabilizer. These products were combined with a total of seven different soils with Unified Soil Classification System classifications of CH, CL, ML, and SM. Durability testing procedures included freeze-thaw, wet-dry, and leach testing. Atterberg limits and strength tests also were conducted before and after selected durability tests. Changes in pH were monitored during leaching. Relative values of soil stiffness were tracked over a 28-day curing period using the soil stiffness gauge. Lime- and cement-stabilized soils showed the most improvement in soil performance for multiple soils, with fly ash-treated soils showing substantial improvement. The results showed that for many soils, more than one stabilization option may be effective for the construction of durable subgrades. The enzymatic stabilizer did not perform as well as the other stabilization alternatives.

Xiaoping Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Engineering properties of quartz mica schist
    Engineering Geology, 2020
    Co-Authors: Xiaoping Zhang, Louis Ngai Yuen Wong, Si Jing Wang
    Abstract:

    Quartz mica schist, which is a highly anisotropic metamorphic rock, usually presents a geotechnical challenge in construction projects. To ensure a safe and economical design, a comprehensive in situ and laboratory investigation scheme is necessary for projects to be built in quartz mica schist. In this study, such a comprehensive laboratory study of the Engineering Behavior of quartz mica schist has been carried out. The P-wave velocity tests, tensile and uniaxial compressive strength tests, and creep deformation tests conducted on specimens with differently oriented schistose planes all reveal the strong anisotropic characters of the rock. The relevant crack-initiation stress and crack-damage stress analysis in uniaxial compression test, which has not been previously applied to studying schistose rock, has been performed in the present study. When loading is parallel to schistose planes, crack initiation stress and crack damage stress are lower than those in other loading directions. As the compressive loading is applied parallel to schistose planes, local tensile stresses are preferentially induced normal to the relatively weak schistose planes. Cracks are thus easier to develop than in any other loading directions. Since schistose plane orientation is one of the key factors to control the formation of macro-cracks and hence failures of unloading test specimens, these Engineering geological characters should be taken into consideration in Engineering design. © 2011 Elsevier B.V.Link_to_subscribed_fulltex

  • Engineering properties of quartz mica schist
    Engineering Geology, 2011
    Co-Authors: Xiaoping Zhang, Louis Ngai Yuen Wong, Si Jing Wang
    Abstract:

    Quartz mica schist, which is a highly anisotropic metamorphic rock, usually presents a geotechnical challenge in construction projects. To ensure a safe and economical design, a comprehensive in situ and laboratory investigation scheme is necessary for projects to be built in quartz mica schist. In this study, such a comprehensive laboratory study of the Engineering Behavior of quartz mica schist has been carried out. The P-wave velocity tests, tensile and uniaxial compressive strength tests, and creep deformation tests conducted on specimens with differently oriented schistose planes all reveal the strong anisotropic characters of the rock. The relevant crack-initiation stress and crack-damage stress analysis in uniaxial compression test, which has not been previously applied to studying schistose rock, has been performed in the present study. When loading is parallel to schistose planes, crack initiation stress and crack damage stress are lower than those in other loading directions. As the compressive loading is applied parallel to schistose planes, local tensile stresses are preferentially induced normal to the relatively weak schistose planes. Cracks are thus easier to develop than in any other loading directions. Since schistose plane orientation is one of the key factors to control the formation of macro-cracks and hence failures of unloading test specimens, these Engineering geological characters should be taken into consideration in Engineering design.