CAJ | 학술논문

为研究深埋、高地应力条件下地下洞群围岩稳定性,新研制大型真三轴加载地质力学模型试验系统,该系统主要由三维钢结构台架装置和液压加载控制系统组成,可实现全三轴应力状态下在侧向施加梯级荷载.在各加载面上研制和布设组合型滚珠式滑动墙,实现新型超低减摩技术.用该系统开展洞群开挖支护的模型试验,在试验技术和模型制作工艺上有了创新和重大改进:采用预制模块堆砌黏结成型的工艺方法制作模型,提高全模型在力学性能上的一致性;采用数字照相变形量测技术、基于光纤Bragg光栅的棒式位移传感器和新研制的高精度光栅尺型微型多点位移计进行围岩内变形量测;新研发施作注浆锚杆和预应力锚索的独到工艺技术;还开展大埋深条件下的超载试验,观察到围岩破坏的发展过程,试验结果还与数值分析进行对比.研究的方法技术及结果将对类似工程研究有一定的指导和借鉴意义.
위연구심매、고지응력조건하지하동군위암은정성,신연제대형진삼축가재지질역학모형시험계통,해계통주요유삼유강결구태가장치화액압가재공제계통조성,가실현전삼축응력상태하재측향시가제급하재.재각가재면상연제화포설조합형곤주식활동장,실현신형초저감마기술.용해계통개전동군개알지호적모형시험,재시험기술화모형제작공예상유료창신화중대개진:채용예제모괴퇴체점결성형적공예방법제작모형,제고전모형재역학성능상적일치성;채용수자조상변형량측기술、기우광섬Bragg광책적봉식위이전감기화신연제적고정도광책척형미형다점위이계진행위암내변형량측;신연발시작주장묘간화예응력묘색적독도공예기술;환개전대매심조건하적초재시험,관찰도위암파배적발전과정,시험결과환여수치분석진행대비.연구적방법기술급결과장대유사공정연구유일정적지도화차감의의.
To study the stability analysis of underground cavern groups at great depth and under high geostress field,a large-scale geomechanical model test system under true triaxial loading is newly developed. The model test system mainly consists of a steel structural frame and a hydraulic loading control system,which adopts active loading on six surfaces of the model block with a true triaxial stress considering trapezoidal loading steps in two horizontal directions. Newly-developed combinational ball-type sliding walls are installed on each side of the major loading surfaces,which can significantly reduce friction. Based on the system,a large-scale geomechanical model test for an underground cavern group is carried out. Major innovations and improvements have been made in terms of experimental techniques and advanced measurement methods/techniques. Precast blocks of analog materials are piled up and bonded to enhance the consistent mechanical properties of the whole model system. Digital photogrammetric technique,fiber Bragg grating(FBG) technology-based displacement sensing bars,and a newly developed mini-extensometers are employed to measure the deformation of surrounding rock mass. A new unique technique of grouted anchor and prestressed cables are conducted. The development process and phenomenon of fracture patterns of rock surrounding are observed and analyzed during excavating and overloading tests. The test results are compared with those of numerical simulations. These achieved results would provide certain guiding significance for study of similar practical engineering projects.