CAJ | 학술논문

对汶川地震断裂带深溪沟出露的基岩错动面两侧岩脉中的石英矿物进行了拉曼谱峰测定，并根据所测石英的464 cm －1拉曼谱峰向高波数的偏移量估算了断裂带中的压应力分布。测试结果表明，错动面附近岩脉中石英的464 cm －1拉曼谱峰向高波数偏移量为3.29 cm－1，相应的压应力值为368.63 M Pa ，明显低于错动面两侧应力积累，这可能是由于错动面的多次活动导致了应力不断得到释放。断裂南东盘（下盘）远离错动面，岩脉中石英的464 cm －1拉曼谱峰向高波数偏移量具有增加的趋势，相应的应力积累也逐渐增强，距错动面21 m处的石英样品的464 cm－1拉曼谱峰向高波数偏移4.40 cm －1，相应压应力可达到494.77 M Pa。剖面北西盘（上盘）在距错动面10 m处，样品464 cm －1拉曼谱峰的偏移量达到最大值，相应的应力积累为519.87 M Pa ，其后远离错动面应力积累开始减弱，在北西盘17 m 处，应力积累骤然下降至400.37 M Pa。在西北盘距错动面27 m处，岩脉石英的464 cm－1拉曼谱峰向高波数偏移量下降至3.21 cm －1，应力已经减弱到359.59 M Pa ，这可能是由于该处位于断裂带的边缘，远离错动面，受到了较小的断层活动的影响。因此，汶川地震断裂带内的应力虽然得到部分释放，但剩余的应力分布并不均匀，而且在局部还存在较高的应力积累，这反应了断裂带中岩石的力学性质在空间上具有不均匀性。
대문천지진단렬대심계구출로적기암착동면량측암맥중적석영광물진행료랍만보봉측정，병근거소측석영적464 cm －1랍만보봉향고파수적편이량고산료단렬대중적압응력분포。측시결과표명，착동면부근암맥중석영적464 cm －1랍만보봉향고파수편이량위3.29 cm－1，상응적압응력치위368.63 M Pa ，명현저우착동면량측응력적루，저가능시유우착동면적다차활동도치료응력불단득도석방。단렬남동반（하반）원리착동면，암맥중석영적464 cm －1랍만보봉향고파수편이량구유증가적추세，상응적응력적루야축점증강，거착동면21 m처적석영양품적464 cm－1랍만보봉향고파수편이4.40 cm －1，상응압응력가체도494.77 M Pa。부면북서반（상반）재거착동면10 m처，양품464 cm －1랍만보봉적편이량체도최대치，상응적응력적루위519.87 M Pa ，기후원리착동면응력적루개시감약，재북서반17 m 처，응력적루취연하강지400.37 M Pa。재서북반거착동면27 m처，암맥석영적464 cm－1랍만보봉향고파수편이량하강지3.21 cm －1，응력이경감약도359.59 M Pa ，저가능시유우해처위우단렬대적변연，원리착동면，수도료교소적단층활동적영향。인차，문천지진단렬대내적응력수연득도부분석방，단잉여적응력분포병불균균，이차재국부환존재교고적응력적루，저반응료단렬대중암석적역학성질재공간상구유불균균성。
Quartz in the veins at the Shenxigou section of Wenchuan earthquake fault zone was investigated by micro-Raman spectroscopic measurement ,and the distribution of compressive stress in the fault zone was estimated by the frequency shifts of the 464 cm-1 vibrational mode of quartz grains in the veins .It was showed that the 464 cm -1 peak arising from the quartz grains in the veins near the fault plane shifts by 3.29 cm -1 ,and the corresponding compressive stress is 368.63 MPa ,which is signifi-cantly lower than the stress accumulation on both sides due to multi-stage events .Stress accumulation increased with moving away from the fault plane in the footwall with the offset of the 464 cm-1 peak arising from the quartz grains in the veins increas-ing ,which can reach 494.77 MPa at a distance of 21 m with a high offset of 4.40 cm -1 of the 464 cm -1 peak .The compressive stress gets the maximum value of 519.87 MPa at a distance of 10 m from the fault plane in the hanging wall with the offset of the 464 cm -1 peak arising from the quartz grains in the veins being 4.62 cm-1 ,followed by a sudden drop in stress accumulation , and it drops to 359.59 MPa at a distance of 17 m .Because of moving away from the foult plane at the edge of the foult zone ,the stress drops to 359.59 MPa with a small value of 464 cm -1 peak offset 3.21 cm -1 at a distance of 27 m from the fault plane in the hanging wall due to the little effect by the fault activity .Therefore ,the stress of Wenchuan earthquake fault zone is partially released ,but the rest of the stress distribution is uneven ,and there is also a high stress accumulation in somewhere in the fault zone ,which reflects that the mechanical properties of the rocks in the fault zone have a characteristic of unevenness in space .