泥页岩前期名义固结压力的层理效应研究

doi:10.13722/j.cnki.jrme.2017.0801

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摘要在研究盖层封闭性过程中发现，仅针对盖层当前的封闭性是不够的，还应研究地质历史时期盖层的演化特征。在盖层封闭性动态演化研究中，对抬升剥蚀改造阶段可采用OCR(over consolidation ratio，超固结比)法进行定量恢复。在确定OCR值过程中，关键的是获取其前期名义固结压力；同时泥页岩为沉积岩，具有明显的层理结构，因此其封闭性表现出较强的层理效应。以龙马溪组泥页岩为研究对象，采用厚壁钢质套筒约束试样横向变形来模拟单轴应变试验，获取了不同层理角度下泥页岩的前期名义固结压力及侧压系数，并分析其层理效应，探讨层理对泥页岩的脆–延转化的临界围压的影响。研究表明：(1) 单轴应变试验曲线大致呈三段变化，剪应力表现出先增大后减小趋势；(2) 前期名义固结压力随层理角度的增大呈先减少后增大的趋势；(3) 前、中侧压系数均表现出明显的层理效应，而层理面对后侧压系数影响不大；(4) 不管对于何种角度的泥页岩，前、中侧压系数均小于1，而后侧压系数均大于1；(5) 泥页岩发生脆–延转化的临界围压除了与前期名义固结压力有关外，还受层理面的影响。该研究为评价不同层理角度盖层的封闭性能提供了重要依据，为建立盖层封闭性的静–动评价模型提供参考。

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	刘俊新1
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	廖杰森1
	袁玉松4
	朱宝龙1
	刘育田1

关键词 ：岩石力学, 泥页岩, 前期名义固结压力, 层理效应, 侧压系数, 超固结比(OCR)

Abstract：During the study on the sealing capacity of cap rocks of argillaceous shale，it was found that focusing only on the current sealing properties of the cap rocks was insufficient，the characteristics of tectonic evolution of the cap rocks in geological history should also be included. In the study of the evolution of the sealing capacity of the cap rock，the OCR(over consolidation ratio) method can be used for the quantitative reconstruction in the reformation stage. To determine the OCR value，the key is to obtain the apparent pre-consolidation stress. The argillaceous shale is a type of sedimentary rocks with obvious bedding structure which may affect the sealing performance. In this paper，the argillaceous shale of Longmaxi formation was studied by using the steel drum of thick wall to constrain the lateral deformation of the specimen in order to simulate the uniaxial strain compression. The bedding effect on the apparent pre-consolidation stress and lateral pressure coefficient of the argillaceous shale were analyzed. The influences of the bedding on the critical confining pressure of brittle to fragile of the argillaceous shale were investigated. The curve of the uniaxial strain test has approximately three sections. The shear stress increases at first and then decreases with the increase of the lateral pressure. The apparent pre-consolidation stress decreases and then increases with the increase of the bedding angle. The early and middle lateral pressure coefficient show a significant bedding effect，but the bedding has little influence on the later lateral pressure coefficient. No matter what the bedding angles of the argillaceous shale are，the early and middle lateral pressure coefficients are less than 1，and the later lateral pressure coefficient is greater than 1. The critical confining pressure of the brittle-ductile transition of the argillaceous shale is related to the apparent pre-consolidation stress，and is also affected by the bedding. This study provides an important basis for evaluating the sealing performance of cap rocks with different bedding angles，and a reference for the establishment of dynamic-static assessment model of cap rock.

Key words： rock mechanics argillaceous shale apparent pre-consolidation bedding effect lateral pressure coefficient over consolidation ratio(OCR)

引用本文:

刘俊新1，2，3，廖杰森1，袁玉松4，朱宝龙1，刘育田1. 泥页岩前期名义固结压力的层理效应研究[J]. 岩石力学与工程学报, 2018, 37(1): 121-130.
LIU Junxin1，2，3，LIAO Jiesen1，YUAN Yusong4，ZHU Baolong1，LIU Yutian1. Bedding effect of the apparent pre-consolidation stress for argillaceous shale. , 2018, 37(1): 121-130.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0801 或 http://www.rockmech.org/CN/Y2018/V37/I1/121

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