http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ultimate Bearing Capacity of Soft Soil Improved by DCM Columns: A Comparative Review
Ali Dehghanbanadaki,Ahmad Safuan A. Rashid,Kamarudin Ahmad,Nor Zurairahetty Mohd Yunus,Jagdish Telangrao Shahu,Mamata Mohanty 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.6
The use of deep cement mixing (DCM) columns for soil stabilization is an economical and reliable ground improvement technique that has been studied extensively. The aim of this article is to review the ultimate bearing capacity (UBC) of soft soils improved by DCM columns in a series of 1 g physical modelling tests. Reliable databases of 35 stabilized tests using end-bearing DCM columns and 42 stabilized tests using floating DCM columns are analyzed. The effects of the influencing parameters of undrained shear strength of the soil (Cus) and DCM columns (Cuc), and the area improvement ratio (α) on the UBC and bearing capacity (Nc = UBC/Cus) are discussed. The failure modes of the improved soil have been compared. The review results show that, for end-bearing and floating DCM columns, the role of α and the strength ratio between the columns and soil, respectively, are vital. The effect of the average end-bearing factor for DCM columns (Nc = 15.27) on the UBC was found to be higher than for floating DCM columns (Nc = 8.08). The experimental results were used to develop four computational models to estimate the UBC of stabilized soil improved by end-bearing and floating DCM columns.
Enhancement of Soft Soil Behaviour by using Floating Bottom Ash Columns
Razieh Moradi,Aminaton Marto,Ahmad Safuan A Rashid,Mohammad Moeen Moradi,Abideen Adekunle Ganiyu,Mohamad Hafeezi Abdullah,Suksun Horpibulsuk 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
The current disposition worldwide is for sustainable construction, and the application of by-products is one of the ways to achieve it. In this research, bottom ash was used as a substitute material in a granular column to decrease settlement and enhance the bearing capacity of soft soil. Bottom ash is a derivate of the coal burning process, it has similar engineering properties to sand and fine gravel. A set of reduced scale physical modelling tests were performed on floating bottom ash columns to assess the improvement in the bearing capacity of the composite ground. The results clearly showed that the bearing capacity of the model soil was greatly improved with the installation of bottom ash column sand. There was an obvious enhancement of the load capacity of the granular columns when they were encased. The usage of bottom ash instead of aggregate or sand for granular columns will reduce the project cost and it aligns with the goal of sustainable construction development.
Predicting the Effective Depth of Soil Stabilization for Marine Clay Treated by Biomass Silica
Lim Jing Jin,Nor Zurairahetty Mohd Yunus,Muhammad Azril Hezmi,Ahmad Safuan Abdul Rashid,Amination Marto,Roohollah Kalatehjari,Faizal Pakir,Nordiana Mashros,AbideenAdekunle Ganiyu 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11
Reclamation and development towards the oceanic area had become a trend of modern days, where the marine soil need to be treated prior construction. The increase in unconfined compressive strength of marine clay treated by Biomass Silica, ‘SH-85’ has been demonstrated by several investigations. This paper studies the stress-strain behavior of marine clay treated with 12% of SH-85 with different curing periods and confining pressures. The results show that the strength parameters of the stabilized soil are greatly improved during the early stage of the curing period under higher confining pressures. In addition, the XRD analysis and microstructure study confirm the appearance of a new reflection peak at 29° in the treated soils indicating the formation of Calcium Silicate Hydrate (CSH). The curing period of 7 days at a confining pressure of 400 kPa was found to be an optimum combination for in situ stabilization. The effective stabilization depth predicted at each location can be defined as the depth ensuing the mentioned confining pressure. The approach of this research can be applied in construction activities associated with marine clay to help engineers in risk assessment, feasibility study and planning of the developments.