Технические науки

IMPROVEMENT USING STONE COLUMN & GEOSYNTHETIC [УЛУЧШЕНИЕ ИСПОЛЬЗОВАНИЯ КАМЕННЫХ СТОЛБОВ И ГЕОСИНТЕТИКИ]

Kwa S.F.N., Kolosov E.S.

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Kwa Salli Fahmi Najeeb – Undergraduate,

CIVIL ENGINEERING FACULTY;

Kolosov Evgeny Sergeevich - Senior Lecturer,

DEPARTMENT OF CONSTRUCTION OF UNIQUE BUILDINGS,

SAINT-PETERSBURG STATE POLYTECHNICAL UNIVERSITY NAMED AFTER PETER THE GREAT,

PETERSBURG

Abstract: stone columns technique is widely used in many parts of the world. It is considered as a successful tool for improving the carrying capacity of soft saturated soil and controlling the settlement and accelerating the consolidation process. The term soft soil reinforced with stone columns is the common term used in literatures for this kind of improvement. This technique was developed in Germany about 60 years ago. (Hughes and Withers, 1974), reported that stone columns were well known in France in 1830. Hence stone columns have been regularly used in Europe since 1950 and in North America since 1972. Stone columns are most often used to improve the behavior of soil with undrianed cohesion cu, in range of 15-25 kPa (Greenwood & Kirsch, 1983), below this strength the lateral support provided by the surrounding soil may be insufficient to prevent excessive radial expansion (bulging) resulting in columns failure. Despite of this, the literature reports the use of conventional stone columns in soil with cu as low as 6 kPa (Barksdale & Bachus; Raju, 1997). In recent years, encasement has been used to provide additional lateral confinement to stone columns, extending their use to very soft soil (Cu< 15 kPa).This technique has been employed on numerous projects throughout Europe (Raithel et al., 2005) and more recently, South America (De Mello et al., 2008). The clay particles get clogged around the stone columns thereby reducing radial drainage. To overcome this limitation and to increase the efficiency of the stone columns with respect to strength and compressibility, stone columns are encased using geosynthetic to improve the lateral support (Kempfert and Gebreselassie, 2006), the major portion of the cost owes to the cost of stone. If replacing a portion of stone by some other cheaper material, without affecting the performance, can reduce the total cost in the present work experimental studies are carried out to evaluate the behavior of stone column encased with geotextile, in which stone is replaced by cheaper crush dust.

Keywords: stone column, geosynthetic, quarry dust, bearing capacity, settlement, arching, modules of elasticity, soft clay, degree of consolidation, ultimate bearing capacity, stabilization.

Ква С.Ф., Колосов Е.С.

Ква Салли Фахми Наджиб – магистрант,

инженерно-строительный факультет;

Колосов Евгений Сергеевич – старший преподаватель, заместитель заведующего кафедрой по научной работе,

кафедра строительства уникальных зданий и сооружений,

Санкт-Петербургский государственный политехнический университет им. Петра Великого,

г. Санкт-Петербург

Аннотация: метод укрепления мягких почв каменными колоннами был разработан в Германии около 60 лет назад (Hughes and Withers, 1974). В Европе каменные колонны регулярно используются с 1950 года, а в Северной Америке - с 1972 года (Greenwood & Kirsch, 1983). Чтобы повысить эффективность применения каменных колонн с точки зрения прочности и сжимаемости, их заключают в оболочку с использованием геосинтетических материалов (Kempfert and Gebreselassie, 2006). В последние годы оболочку используют для дополнительного бокового удержания каменных колонн. В настоящей работе приведены экспериментальные исследования и оценка поведения каменной колонны, заключенной в оболочку с геотекстилем.

Ключевые слова: каменная колонна, геосинтетика, несущая способность.

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Полная ссылка для цитирования на русском языке. Ква С.Ф., Колосов Е.С. УЛУЧШЕНИЕ ИСПОЛЬЗОВАНИЯ КАМЕННЫХ СТОЛБОВ И ГЕОСИНТЕТИКИ // International Scientific Review № 5(36) / International Scientific Review of the Problems and Prospects of Modern Science and Education: XXXIV International Scientific and Practical Conference ( Chicago, USA - 25 MAY, 2017). с. {см. сборник} Краткая ссылка для цитирования на русском языке.Ква С.Ф., Колосов Е.С. УЛУЧШЕНИЕ ИСПОЛЬЗОВАНИЯ КАМЕННЫХ СТОЛБОВ И ГЕОСИНТЕТИКИ // International Scientific Review № 5(36). 2017. с. {см. сборник}

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