Abstract Most onshore basins have experienced one or more phases of burial and erosion. The geomechanical evolution of simplified and idealised fault-bounded mudrock basins on crystalline basement subject to burial and erosion cycles is examined numerically. The changes in strains and stress state and the displacements, including bedding slip, which occur with changes of the overlying load, are tracked. Changes of mechanical properties to represent diagenesis are included. Development of the widely reported ‘high’ horizontal normal stresses results from the changes of vertical load and does not rely directly on applied horizontal tectonic shortening strains. Lateral gradients of normal stress associated with faults are described. The final basin stress state is related to the magnitudes of the burial and erosion, diagenetic or otherwise changes of mechanical properties and pore pressure changes during burial and at depth. The magnitudes of the horizontal stress developed for the 1 km and 2 km burial and erosion cycles tested here exceed the magnitude of the vertical stress for a range of depths extending downwards from the surface unless the horizontal stress is reduced at shallow depths by failure during erosion. Bedding shear instability during erosion, around faults and otherwise, may influence the response to engineering disturbance.

中文翻译：

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应力状态对埋藏、侵蚀、力学特性、孔隙压力和断层历史的依赖性

摘要 大多数陆上盆地都经历了一个或多个阶段的埋藏和侵蚀。对晶体基底上受埋藏和侵蚀循环影响的简化和理想化断层边界泥岩盆地的地质力学演化进行了数值研究。跟踪应变和应力状态的变化以及位移，包括随上覆载荷变化而发生的顺层滑移。包括代表成岩作用的机械特性变化。广泛报道的“高”水平法向应力的发展源于垂直载荷的变化，并不直接依赖于施加的水平构造缩短应变。描述了与断层相关的正应力的横向梯度。最终盆地应力状态与埋藏和侵蚀的大小有关，埋藏期间和深部的成岩作用或机械性质的其他变化和孔隙压力变化。此处测试的 1 公里和 2 公里埋藏和侵蚀循环产生的水平应力的大小超过了从地表向下延伸的一系列深度的垂直应力的大小，除非由于侵蚀过程中的破坏而降低了浅层深度的水平应力. 侵蚀期间、断层周围和其他地方的层理剪切不稳定可能会影响对工程扰动的响应。此处测试的 1 公里和 2 公里埋藏和侵蚀循环产生的水平应力的大小超过了从地表向下延伸的一系列深度的垂直应力的大小，除非由于侵蚀过程中的破坏而降低了浅层深度的水平应力. 侵蚀期间、断层周围和其他地方的层理剪切不稳定可能会影响对工程扰动的响应。此处测试的 1 公里和 2 公里埋藏和侵蚀循环产生的水平应力的大小超过了从地表向下延伸的一系列深度的垂直应力的大小，除非由于侵蚀过程中的破坏而降低了浅层深度的水平应力. 侵蚀期间、断层周围和其他地方的层理剪切不稳定可能会影响对工程扰动的响应。