Conforme a ABNT NBR 6122:2019:
Estacas isoladas e estacas dispostas segundo um único alinhamento, devem ser projetadas de modo a suportar os momentos introduzidos pelas excentricidades executivas.
Pode ser dispensado desta observância o projeto que incluir vigas de travamento.
Principalmente quando há solo de baixa resistência nas camadas inicias, o bloco não fornece restrição suficiente ao movimento lateral da base do pilar, dessa forma o comprimento de flambagem do pilar acaba sendo maior do que o considerado no caso de blocos travados.
Ver figura abaixo.



Ou seja:
Não recomenda-se dispensar o travamento, tendo em vista os impactos estruturais dessa decisão (visto nas imagens anteriores).
Créditos de imagens: @mdxengenharia
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