针对超长群桩使用较多而理论研究较少的现状，进行了大型的室内超长群桩模型试验。
According to the current situation of super-long pile groups, i. e. more application and less theoretical studies, a large-scale laboratory model test is conducted.
煤层深孔预裂爆破近年来在瓦斯抽放中运用日益增多，但目前对其爆破理论研究较少。
The technique of deep-hole presplitting blasting in coal bed is widely used for gas predrainage recently; but its blasting theory is not clear up to now.
对于船舶管理人的理论研究，一般也侧重于经营管理策略，较少涉及其民事法律责任。
About the theoretical research of the ship manager, most papers emphasize on the strategy of operation and management, not involve its legal liability.
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