Evaluation of undrained failure envelopes of caisson foundations under combined loading

Abstract

In this paper, results of a three-dimensional finite element study addressing the effect of and maximum horizontal bearing capacity factors. The undrained response of caisson 8 foundations under combined V-H and V-M load space is studied and presented using 9 failure envelopes generated with side-swipe method. The kinematic mechanism 10 accompanying failure under uniaxial loading is addressed and presented for different 11 embedment ratios. Predictions of the uniaxial bearing capacities are compared with other 12 models and it is confirmed that the proposed equations appropriately describe the 13 capacity of caisson foundations under uniaxial vertical, horizontal and moment loading in 14 homogenous undrained soils. The results of this paper can be used as a basis for standard 15 design codes of off-shore skirted shallow foundations which will be the first of its kind. 16

Study on Calculation Method of VHMT Composite Bearing Capacity of Bucket Foundation for On-bottom Pipelines in Clay

“…The calculated results are in good agreement with those of the existing models, indicating that the model and the computational grid can accurately obtain the calculated results, which can be used in the analysis of torsion influence. [17,18,21].…”

“…4. Undrained shear strength used in Mehravar's calculation is a fixed value [18] . The results show that the vertical bearing capacity coefficient is a function of L/D, when L/D = 0, the theoretical value of vertical bearing capacity coefficient of the saturated soft clay is 6.18.…”

Investigating the monotonic behaviour of hybrid tripod suction bucket foundations for offshore wind towers in sand

“…The installation process of the tripod bucket foundation into the seabed is similar to that of the single suction bucket foundation (monopod). After an initial penetration of the bucket into the seabed caused by self-weight, further penetration is achieved by pumping air and water out of the bucket [14][15][16][17].…”

“…The bearing capacity of the single suction bucket foundations has been extensively studied in different soil types [15,[18][19][20], whereas only a few studies have examined the behaviour of tripod suction bucket foundations under lateral loading [21][22][23].…”

Deep Learning-Based Design Model for Suction Caissons on Clay

“…In this regard, the combined foundation capacity under complex vertical (V), horizontal (H) and moment (M) loads are normally represented by a failure envelope (Roscoe, 1956). Extensive studies have been conducted to investigate the failure envelope of the suction caisson foundation in drained sand and undrained clay (Bransby and Randolph, 1998;Bransby and Yun, 2009;Gourvenec and Barnett, 2011;Hung and Kim, 2014;Karapiperis and Gerolymos, 2014;Gerolymos et al, 2015;Vulpe, 2015;Mehravar et al, 2016). Many approximating expressions have been proposed to capture the VHM failure envelopes, as summarized in Table 1.…”