Experimental study of ground improvement by using encased stone columns
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TECHNICAL PAPER
Experimental study of ground improvement by using encased stone columns Ankit Thakur1 · Saurabh Rawat1 · Ashok Kumar Gupta1 Received: 20 April 2020 / Accepted: 24 September 2020 © Springer Nature Switzerland AG 2020
Abstract The application of stone columns increases the stiffness of soft soils which contributes to its load carrying capacity and accelerates the process of consolidation leading to reduction in settlement. However, under external loading, squeezing of adjacent soil into the columns not only compromises the integrity of the columns but also reduces its stiffness, strength and drainage properties. The present study investigates the use of vertically and horizontally reinforced stone columns, as a remedial measure for ordinary unreinforced stone columns. The vertical reinforcement is done by encasing the stone columns in geotextile and horizontally by placing geotextile circular discs within the columns at regular interval. Model tests on group of 3 and 4 unreinforced and reinforced stone columns have been conducted in weak sandy soil. The load–settlement response and failure modes for both reinforced and unreinforced groups have been studied. It is observed that reinforced group of stone columns depict better load bearing capacity as compared to unreinforced group. Moreover, bearing capacity for vertically encased and horizontally reinforced is almost similar, with horizontally reinforced group of 4 stone columns depicting slightly higher (1–2%) bearing capacity for a settlement of 30 mm. The experimental results are also validated with theoretical results and are found to be in good agreement. Keywords Stone columns · Soft soil · Geotextile · Vertical encasement · Horizontal reinforcement · Bearing capacity
Introduction The concept of stone column construction was introduced in the year 1956 as a technique for the ground improvement and to strengthen the bearing capacity of soft cohesive soils. Till date, many research groups have invested effort to understand the behaviour of stone columns under different soil conditions, configurations, installation methods, different kinds of reinforcements and various loading conditions. The ultimate objective of all these studies was to improve the performance of stone columns with respect to serviceability and stability rendered to the weak/soft ground conditions.
* Saurabh Rawat [email protected] Ankit Thakur [email protected] Ashok Kumar Gupta [email protected] 1
Department of Civil Engineering, Jaypee University of Information Technology, Solan, Himachal Pradesh, India
The previous studies conducted in regard of stone columns can be classified into two sections as:
Conventional (unreinforced) stone columns The conventional stone columns have proved to be an effective ground improvement method for weak soils by effectively reducing the settlement of the structure in case of soft cohesive soils and soil liquefaction potential for poor cohesion less soils. The three-way advantage provided by conventional stone colum
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