摘要
HTPF法现场测试和反演计算由于需要大量原生裂隙面而使得该方法的广泛推广应用受到极大限制。新近提出的M-HTPF法有效的解决了这个问题,该方法依据摩尔库伦理论,通过建立结构面上的广泛存在的法向应力和剪切应力关系,优化方程组求解条件来实现降低对原生结构面数量的依赖。笔者基于M-HTPF法,利用最小二乘法和计算机程序试错搜索原生裂隙面摩擦系数的办法,在MATLAB平台上利用mldivide命令实现方程组求解,通过计算机程序自动搜索和统计,可以实现原地应力张量的反演计算。通过利用法国Mercantour公路隧道HTPF测试数据和山东某科研钻孔的测试数据,检验了反演计算软件的可靠性和实用性。研究结果表明,M-HTPF法可使用4条及4条以上原生裂隙对原地应力进行有效的反演计算分析,反演计算获得的数据离散性小,数据稳定性高。该方法为单孔三维水压致裂原地应力测量提供了新的思路和途径。
Due to the HTPF method of field test and inversion calculation require a large number of pre-existing fractures,the wide applications is restricted. The proposed M-HTPF method can solve the problem effectively. The method based on Mohr-coulomb strength theory,through the establishment of relationship between normal stress and shear stress on the surface of the structure,optimizing the equations solving condition to reduce the number of primary structural plan. The author used the least square method and the trial searching algorithm code to determine the frictional coefficient of preexisting fractures, used mldivide command implementation equations solving through MATLAB,designed the search and statistics program based on M-HTPF method,which implement automatically the inversion calculation of the in-situ stress tensor. The reliability and practicability of inversion calculation software were tested by using the test data of the HTPF test data of the French Mercantour highway tunnel and the test data of a scientific research hole in Shandong province. The research results show that the M-HTPF method can be used in the inversion calculation and analysis of the in-situ stress,under the condition of at least four fractures,and at the same time,this method can reduce the data distribution dispersion,enhances the stability of the data. The M-HTPF method offers a new access to determine a complete stress tensor using a single borehole.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第S2期669-676,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41274100)
中央级科研院所基本科研业务专项(ZDJ2012-20)
中国大陆综合地球物理场观测仪器研发专项(Y201616)
关键词
水压致裂
M-HTPF法
全应力张量
反演计算
软件开发
hydraulic fracturing
M-HTPF
the stress tensor
inversion calculation
software development
