The Results of Dynamic (Pile Driving Analysis) and Traditional Static Piling Tests in Capital of Kazakhstan

Abstract

Traditionally, pile load tests in Kazakhstan are carried out using static and dynamic load test methods. Static pile load test is the most reliable method to obtain the load-settlement relation of piles. Most of the static pile load tests are performed using reaction systems. Furthermore, cost and time for the static pile load test are relatively high compared to the dynamic pile load testing. Therefore, the number of pile load tests in construction site is limited to 2 or 5 piles in usual of constructed piles In Kazakhstan. This paper includes the short summary about dynamic and static tests by driven piles (cross-section 30×30 cm and length of 12 m). The methodologies of definition bearing capacity of the pile by aforementioned methods were also given. As an example for those methods, paper describes the results of the dynamic, traditional static and the new PDA (Pile Dynamic Analyzer) tests of cooperative work of soils and piles performed in the construction site of the New Railway Station in Astana. According to the results of tests were determined the possible depth of penetration and bearing capacity of piles, as well as recommendations on the device of working. The construction is part of the preparations for EXPO 2017. It will be 11 times bigger than the existing railway station. The height of the six-floor complex will be 49.5 metres, the width 116 metres and the length 630 metres.

Complex of Static Loading Tests of Bored Piles

“…Standard -SNiP RK 5.01-03-2002 -ultimate value of settlement of the tested pile is determined as and depending on the category of construction is equal to 16 or 24 mm. The last argument shows the conditional character of SLT method [3][4][5][6][7].…”

“…In modern CFA technology, the systematic employment of devices auto-recording the drilling data represent a real breakthrough considering that in the past the CFA method was not accurate, and relied on the operator's ability: now such devices guarantee the control and recording of the data during the whole construction process. The recorded working data are usually drilling/withdrawal speed, rotation speed, depth, concrete pressure and delivery rate per increment of auger lift during casting [4][5]. The CFA construction sequence is comprised of five stages in Figure 1.…”

“…Fig. 3 Results of Static Compression Pile LoadTest of piles SCPLT(1,2,3,4) Vertical static loading of piles using the SCPLT method is one of the most widely used field test methods for soil used to analyze pilebearing capacity. The pile may be tested in two standards cycles:-The 1st cycle tests the pile to its 150% of the Design Load.-The 2nd cycle tests the pile to its 200% of the Design Load.…”