State of the art：challenge and methods on large deformation in tunnel、engineering and introduction of a new type supporting system
Abstract：The large deformation disasters occurred during the construction of tunnels were discussed and summarized systematically from the perspectives of the definition，the type，the classification，the fundamental mechanisms，the standard of determination and the measure of control of the large deformation. The mechanical mechanism and the supporting philosophy of equilibrium transfer were illustrated. The key techniques and the important breakthrough were presented. The design method of structural frame core used in the super high-rise building was adopted to form a deformation control strategy of“release initially，resist then and become rigid at last”. A new style supporting system of the steel grids with concrete tube core were thus developed to be used in the weak and fractured stratum. The catalytic mechanism of bearing capacity of surrounding rock was explained. Thecharacteristics of the multilevel transformation and load bearing were summarized. The results of field test verified the reliability of the support system.
收稿日期：2015–10–06；修回日期：2015–11–14
基金项目：国家重点基础研究发展计划(973)项目(2013CB036000)；国家自然科学基金资助项目(51479106)；山东省自然科学基金资助项目(ZR2014EEQ002)
Supported by the National Basic Research Program of China(973 Program)(Grant No. 2013CB036000)，National Natural Science Foundation of China(Grant No.
51479106) and Shandong Provincial Natural Science Foundation of China(Grant No. ZR2014EEQ002)
作者简介：李术才(1965–)，男，博士，1987 年毕业于山东矿业学院土木工程系矿井建设专业，现任教授、博士生导师，主要从事裂隙岩体断裂损伤、
地质灾害超前预报与防治等方面的教学与研究工作。E-mail：lishucai@sdu.edu.cn。通讯作者：李利平(1981–)，男，博士，现任教授、硕士生导师。
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