CAJ | 학술논문

将研制的新型柔性均布压力加载装置与传统的刚性加载装置分别应用到大型地质力学模型试验中，利用应力不均匀系数?对其加载效果进行了量化对比分析。试验结果表明，随着加载压力值与距模型表面距离的增加，不均匀系数?减小，压力分布趋于均匀；在模型试验中采用柔性均布压力加载装置，与刚性加载方式相比，其更有利于加载压力在模型体中均匀扩散，产生均匀的应力场，在该试验条件下采用此装置，模型内距模型表面300 mm处应力场已基本达到均匀的状态，模型初始应力施加完后，其?仅为0.086，而采用刚性加载方式时其对应的?则高达0.283；该装置在距模型表面较近时或加载压力较小时亦能产生较好的均布压力加载效果，如加载压力为0.28 MPa时距模型表面150 mm处?仅为0.174，具有减小边界效应影响范围、提高低应力水平下的模型试验精度的作用。
장연제적신형유성균포압력가재장치여전통적강성가재장치분별응용도대형지질역학모형시험중，이용응력불균균계수?대기가재효과진행료양화대비분석。시험결과표명，수착가재압력치여거모형표면거리적증가，불균균계수?감소，압력분포추우균균；재모형시험중채용유성균포압력가재장치，여강성가재방식상비，기경유리우가재압력재모형체중균균확산，산생균균적응력장，재해시험조건하채용차장치，모형내거모형표면300 mm처응력장이기본체도균균적상태，모형초시응력시가완후，기?부위0.086，이채용강성가재방식시기대응적?칙고체0.283；해장치재거모형표면교근시혹가재압력교소시역능산생교호적균포압력가재효과，여가재압력위0.28 MPa시거모형표면150 mm처?부위0.174，구유감소변계효응영향범위、제고저응력수평하적모형시험정도적작용。
The developed flexible uniform pressure loading device and traditional rigid loading device are applied to large-scale geomechanical model test, of which loading effect is comparatively analyzed by using the stress nonuniformity coefficient?. The test results show that, with the loading stress and the distance from the surface increasing, the stress nonuniformity coefficient?decreases, and stress distribution tends to uniform. Comparing to the rigid loading method, flexible uniform pressure loading device is more beneficial to uniform stress dispersion and forming uniform stress field. With the flexible uniform pressure loading device being applied to the test, the stress field is nearly uniform where the depth from the surface is 300 mm in the test condition;and the?is 0.086 when the initial stress has been applied;and the corresponding?is 0.283 with rigid loading method applied in the test. Even though the distance from the surface is short or the loading stress is low, the flexible uniform pressure loading device also produces a good uniform loading effect, and when the on-load pressure is 0.28 MPa, the?is only 0.174 where the depth from the surface is 150 mm. The device has the function of reducing range of boundary effect and improving model test accuracy.