title: Sensitive soils of the Puketoka Formation, Hamilton, New Zealand

authors: Kitchen, Emily

subjects: Puketoka Formation

abstract: Sensitive soils are known to cause significant issues in the infrastructure and civil engineering industry, and are prone to sudden, oftentimes catastrophic failures following long periods of stability. 
The Walton Subgroup soils deposited through volcanic activity and partially reworked by the ancestral Waikato River are identified within the Hamilton Basin. These materials are of interest to the engineering community, and consultancy groups in the Hamilton area, due to their identified sensitivity. The Puketoka Formation was focused on in this study.
Sampling of material was undertaken at two active construction sites in Hamilton: Dixon Road Roundabout, and Temple View Urban Development. A series of classification tests were completed to determine the samples’ mineralogical and geotechnical characteristics. 
Mineralogical testing found that all the materials were silt dominated (55.06 – 81.12 %), with sub-ordinate clay (13.10 – 18.85 %) and sand (5.56 – 25.35 %) fractions. The moisture contents were variable (49 – 65 %). The field moist bulk density varied throughout the samples (1069 – 1576 kg/m3), as did the oven dry bulk densities (645 – 1057 kg/m3). The porosity as a result also varied (36 – 51 %). The void ratios followed the same trend as the porosity values (0.56 – 0.88). The particle densities of the materials also showed variation (1935 – 2487 kg/m3). The activities of all three samples were variable, ranging from inactive (0.60) to active (1.79). The X-Ray Diffraction (XRD) analysis determined that the main clay mineral present within the samples was a kaolinite group clay, either halloysite or kaolinite. The Fieldes & Perrott NaF test to determine the presence of allophane was also completed on the samples. Both tests were negative, confirming the dominance of halloysite. Bulk analysis also determined other constituents of the samples to include quartz, plagioclase, augite and volcanic glass. Scanning Electron Microscopy (SEM) indicated the main halloysite morphologies present to be a combination of short and long tubules, spheroids, plates and book formations. The microstructure was analysed, and the main clay minerals, grains, microaggregates, and pores within the materials described. The microfabric was consistent for all three samples, with each showing an abundance of small pores (< 20 µm). These pores hold significant amounts of water in not readily accessible locations, leading to the highly porous, but poorly permeable nature of the materials. DRAB1 and TV1 showed microstructures consistent with Huppert (1986) and Beattie’s (1990) ‘matrix’ structures, whilst TV2 showed a more dominant ‘skeletal’ to ‘matrix’ structure. 
Atterberg limits testing found that the samples had a high liquid limit (59 – 75 %) and plastic limit (41 – 53 %), but a variable plasticity index (8 – 34 %) and liquidity index (0.1 – 2). This placed all three samples within the high plasticity “MH” category upon the Casagrande chart. Consolidated undrained triaxial testing of DRAB1 and TV1 indicated a characteristic normally consolidated response to shear, with the majority of cores showing shear band formation. Only TV1 at 170 kPa displayed an intermediate failure type, potentially occurring due to a combination of material being tested, confining pressure, and the low shear rate allowing time for pressure dissipation. The percentage of axial strain the cores failed at varied (1.81 – 16.35 %), and the peak deviator stress (129 – 277 kPa) and pore water pressure values (717.2 – 879.7 kPa) tended to increase as the confining pressures increased. Graphical outputs show a moderate strain, contractive (MSC) style of failure. The effective shear strength values produced were in keeping with the varying ranges of previously published values (effective cohesion: 0 – 37 kPa, effective friction angle: 27 - 38°). The permeability for all three samples was estimated to be ~10-9 – 10-10. Thin section analyses of failed core sections for DRAB1 at 270 kPa confining pressure and TV1 at 130 and 230 kPa confining pressures found that some degree of shear formation and propagation occurred. The calculated R’ angle for DRAB1 was closely observed in the thin section, however was not for TV1. This was hypothesised to have occurred due to a true shear band failure not occurring, rather the development of intermediate to juvenile shear bands within the soil. 
The sensitivity of the Puketoka Formation and wider Walton Subgroup is hypothesised to have been derived from the reworking and weathering the materials experienced. This in turn influenced the porosity and permeability of the materials, which I believe govern the sensitivity of the soils to a degree. Therefore, I believe the Puketoka Formation materials are representative of a silt-dominated, minimally reworked deposit of volcanic origin, that showed appreciable differences compared with the previously studied Tauranga soils. 
The remediation strategies used in the engineering industry were also analysed, and the suitability of the strategies in the context of the Puketoka Formation discussed. This assessment provides an overview of why traditional strategies for remediation may not be beneficial in some cases for the Walton Subgroup materials, which could be of benefit to key engineering groups that encounter these soil materials.
The results of this study provide a set of data which can be used as an initial reference point. The findings and hypotheses made could be of use to key groups including local engineering consultancies, who handle these materials regularly.

text: Sensitive soils of the Puketoka Formation, Hamilton, New Zealand Sensitive soils are known to cause significant issues in the infrastructure and civil engineering industry, and are prone to sudden, oftentimes catastrophic failures following long periods of stability. 
The Walton Subgroup soils deposited through volcanic activity and partially reworked by the ancestral Waikato River are identified within the Hamilton Basin. These materials are of interest to the engineering community, and consultancy groups in the Hamilton area, due to their identified sensitivity. The Puketoka Formation was focused on in this study.
Sampling of material was undertaken at two active construction sites in Hamilton: Dixon Road Roundabout, and Temple View Urban Development. A series of classification tests were completed to determine the samples’ mineralogical and geotechnical characteristics. 
Mineralogical testing found that all the materials were silt dominated (55.06 – 81.12 %), with sub-ordinate clay (13.10 – 18.85 %) and sand (5.56 – 25.35 %) fractions. The moisture contents were variable (49 – 65 %). The field moist bulk density varied throughout the samples (1069 – 1576 kg/m3), as did the oven dry bulk densities (645 – 1057 kg/m3). The porosity as a result also varied (36 – 51 %). The void ratios followed the same trend as the porosity values (0.56 – 0.88). The particle densities of the materials also showed variation (1935 – 2487 kg/m3). The activities of all three samples were variable, ranging from inactive (0.60) to active (1.79). The X-Ray Diffraction (XRD) analysis determined that the main clay mineral present within the samples was a kaolinite group clay, either halloysite or kaolinite. The Fieldes & Perrott NaF test to determine the presence of allophane was also completed on the samples. Both tests were negative, confirming the dominance of halloysite. Bulk analysis also determined other constituents of the samples to include quartz, plagioclase, augite and volcanic glass. Scanning Electron Microscopy (SEM) indicated the main halloysite morphologies present to be a combination of short and long tubules, spheroids, plates and book formations. The microstructure was analysed, and the main clay minerals, grains, microaggregates, and pores within the materials described. The microfabric was consistent for all three samples, with each showing an abundance of small pores (< 20 µm). These pores hold significant amounts of water in not readily accessible locations, leading to the highly porous, but poorly permeable nature of the materials. DRAB1 and TV1 showed microstructures consistent with Huppert (1986) and Beattie’s (1990) ‘matrix’ structures, whilst TV2 showed a more dominant ‘skeletal’ to ‘matrix’ structure. 
Atterberg limits testing found that the samples had a high liquid limit (59 – 75 %) and plastic limit (41 – 53 %), but a variable plasticity index (8 – 34 %) and liquidity index (0.1 – 2). This placed all three samples within the high plasticity “MH” category upon the Casagrande chart. Consolidated undrained triaxial testing of DRAB1 and TV1 indicated a characteristic normally consolidated response to shear, with the majority of cores showing shear band formation. Only TV1 at 170 kPa displayed an intermediate failure type, potentially occurring due to a combination of material being tested, confining pressure, and the low shear rate allowing time for pressure dissipation. The percentage of axial strain the cores failed at varied (1.81 – 16.35 %), and the peak deviator stress (129 – 277 kPa) and pore water pressure values (717.2 – 879.7 kPa) tended to increase as the confining pressures increased. Graphical outputs show a moderate strain, contractive (MSC) style of failure. The effective shear strength values produced were in keeping with the varying ranges of previously published values (effective cohesion: 0 – 37 kPa, effective friction angle: 27 - 38°). The permeability for all three samples was estimated to be ~10-9 – 10-10. Thin section analyses of failed core sections for DRAB1 at 270 kPa confining pressure and TV1 at 130 and 230 kPa confining pressures found that some degree of shear formation and propagation occurred. The calculated R’ angle for DRAB1 was closely observed in the thin section, however was not for TV1. This was hypothesised to have occurred due to a true shear band failure not occurring, rather the development of intermediate to juvenile shear bands within the soil. 
The sensitivity of the Puketoka Formation and wider Walton Subgroup is hypothesised to have been derived from the reworking and weathering the materials experienced. This in turn influenced the porosity and permeability of the materials, which I believe govern the sensitivity of the soils to a degree. Therefore, I believe the Puketoka Formation materials are representative of a silt-dominated, minimally reworked deposit of volcanic origin, that showed appreciable differences compared with the previously studied Tauranga soils. 
The remediation strategies used in the engineering industry were also analysed, and the suitability of the strategies in the context of the Puketoka Formation discussed. This assessment provides an overview of why traditional strategies for remediation may not be beneficial in some cases for the Walton Subgroup materials, which could be of benefit to key engineering groups that encounter these soil materials.
The results of this study provide a set of data which can be used as an initial reference point. The findings and hypotheses made could be of use to key groups including local engineering consultancies, who handle these materials regularly.

year: 2021

title: A Unified Model of Internet Scale Alerting Services

authors: Hinze, Annika

subjects: computer science

abstract: In the last years, alerting systems have gained strengthened attention. Several systems have been implemented. For the evaluation and cooperation of these systems, the following problems arise: The systems and their models are not compatible, and existing models are only appropriate for a subset of conceivable application domains. Due to modeling differences, a simple integration of different alerting systems is impossible. What is needed, is a unified model that covers the whole variety of alerting service applications. This paper provides a unified model for alerting services that captures the special constraints of most application areas. The model can serve as a basis for an evaluation of alerting service implementations. In addition to the unified model, we define a general profile structure by which clients can specify their interest. This structure is independent of underlying profile definition languages. To eliminate drawbacks of the existing non-cooperating solitary services we introduce a new technique, the Mediating Alerting Service (MediAS). It establishes the cooperation of alerting services in an hierarchical and parallel way.

text: A Unified Model of Internet Scale Alerting Services In the last years, alerting systems have gained strengthened attention. Several systems have been implemented. For the evaluation and cooperation of these systems, the following problems arise: The systems and their models are not compatible, and existing models are only appropriate for a subset of conceivable application domains. Due to modeling differences, a simple integration of different alerting systems is impossible. What is needed, is a unified model that covers the whole variety of alerting service applications. This paper provides a unified model for alerting services that captures the special constraints of most application areas. The model can serve as a basis for an evaluation of alerting service implementations. In addition to the unified model, we define a general profile structure by which clients can specify their interest. This structure is independent of underlying profile definition languages. To eliminate drawbacks of the existing non-cooperating solitary services we introduce a new technique, the Mediating Alerting Service (MediAS). It establishes the cooperation of alerting services in an hierarchical and parallel way.

year: 1999

title: Shifting tectonic plates of key discourses in New Zealand early childhood education policy (1989-2017):  A critical discourse analysis at the dawn of change

authors: Westbrook, Fiona

subjects: New Zealand

abstract: This thesis analysed the presence of neoliberalism, socialism and te Ao Māori in fundamental policy documents that frame New Zealand early childhood practice. It did so to critically engage with, and thus make sense of, neoliberalism’s application and potential growth in New Zealand early childhood policies from 1989 to 2017. The research additionally focused on the interplay of socialist and te Ao Māori discourses in these texts, in conjunction with neoliberalism. It employed a poststructuralist conceptual framework that utilised Kristeva’s intertextuality and Foucault’s discourse, governmentality, and power/knowledge. The philosophical framework facilitated an appreciation of the early childhood education (ECE) sector and government discourses, via policies that exhibited discursive power, truths, and knowledges. This thesis’ approach was employed through a critical discourse analysis, incorporating Kristeva’s intertextuality, Fairclough’s manifest intertextuality and interdiscursivity, as well as a keyword search. This form of document analysis was selected because it enabled me as the researcher to gain a deeper more developed understanding of the policy texts, eliciting meaning and recognition of the discourses often naturalised within them. 
 
Contrary to the dominant claims in ECE literature concerning contemporary discourse, the analysis did not discover the neoliberal discourse’s predominance within the selected policies and documents, as was expected. The neoliberal discourse did exist within government endorsed texts, such as the foreword of Te Whāriki (Ministry of Education, 2017b) and Four Year Plan 2016-2020 (Ministry of Education, 2016). However, when the texts came closest to the sector, such as Te Whāraki (Ministry of Education, 1996; 2017b) and the Licensing Criteria Early Childhood Education and Care (Ministry of Education, 2008), the discourses of socialism, te Ao Māori and neoliberalism, nullified, transformed and modified one another. These findings were exemplified in the updated Te Whāraki (Ministry of Education, 2017b), that limited the neoliberal use of individualism from the original, while also upgrading children’s future potential. ‘Future’ within this text, however, was constructed through a modification of te Ao Māori by absorbing and embodying it in incomplete ways.  
 
This thesis analysed the presence of neoliberalism, socialism and te Ao Māori in fundamental policy documents that frame New Zealand early childhood practice. It did so to critically engage with, and thus make sense of, neoliberalism’s application and potential growth in New Zealand early childhood policies from 1989 to 2017. The research additionally focused on the interplay of socialist and te Ao Māori discourses in these texts, in conjunction with neoliberalism. It employed a poststructuralist conceptual framework that utilised Kristeva’s intertextuality and Foucault’s discourse, governmentality, and power/knowledge. The philosophical framework facilitated an appreciation of the early childhood education (ECE) sector and government discourses, via policies that exhibited discursive power, truths, and knowledges. This thesis’ approach was employed through a critical discourse analysis, incorporating Kristeva’s intertextuality, Fairclough’s manifest intertextuality and interdiscursivity, as well as a keyword search. This form of document analysis was selected because it enabled me as the researcher to gain a deeper more developed understanding of the policy texts, eliciting meaning and recognition of the discourses often naturalised within them. 
 
Contrary to the dominant claims in ECE literature concerning contemporary discourse, the analysis did not discover the neoliberal discourse’s predominance within the selected policies and documents, as was expected. The neoliberal discourse did exist within government endorsed texts, such as the foreword of Te Whāriki (Ministry of Education, 2017b) and Four Year Plan 2016-2020 (Ministry of Education, 2016). However, when the texts came closest to the sector, such as Te Whāraki (Ministry of Education, 1996; 2017b) and the Licensing Criteria Early Childhood Education and Care (Ministry of Education, 2008), the discourses of socialism, te Ao Māori and neoliberalism, nullified, transformed and modified one another. These findings were exemplified in the updated Te Whāraki (Ministry of Education, 2017b), that limited the neoliberal use of individualism from the original, while also upgrading children’s future potential. ‘Future’ within this text, however, was constructed through a modification of te Ao Māori by absorbing and embodying it in incomplete ways.  
 
This thesis analysed the presence of neoliberalism, socialism and te Ao Māori in fundamental policy documents that frame New Zealand early childhood practice. It did so to critically engage with, and thus make sense of, neoliberalism’s application and potential growth in New Zealand early childhood policies from 1989 to 2017. The research additionally focused on the interplay of socialist and te Ao Māori discourses in these texts, in conjunction with neoliberalism. It employed a poststructuralist conceptual framework that utilised Kristeva’s intertextuality and Foucault’s discourse, governmentality, and power/knowledge. The philosophical framework facilitated an appreciation of the early childhood education (ECE) sector and government discourses, via policies that exhibited discursive power, truths, and knowledges. This thesis’ approach was employed through a critical discourse analysis, incorporating Kristeva’s intertextuality, Fairclough’s manifest intertextuality and interdiscursivity, as well as a keyword search. This form of document analysis was selected because it enabled me as the researcher to gain a deeper more developed understanding of the policy texts, eliciting meaning and recognition of the discourses often naturalised within them. 
 
Contrary to the dominant claims in ECE literature concerning contemporary discourse, the analysis did not discover the neoliberal discourse’s predominance within the selected policies and documents, as was expected. The neoliberal discourse did exist within government endorsed texts, such as the foreword of Te Whāriki (Ministry of Education, 2017b) and Four Year Plan 2016-2020 (Ministry of Education, 2016). However, when the texts came closest to the sector, such as Te Whāraki (Ministry of Education, 1996; 2017b) and the Licensing Criteria Early Childhood Education and Care (Ministry of Education, 2008), the discourses of socialism, te Ao Māori and neoliberalism, nullified, transformed and modified one another. These findings were exemplified in the updated Te Whāraki (Ministry of Education, 2017b), that limited the neoliberal use of individualism from the original, while also upgrading children’s future potential. ‘Future’ within this text, however, was constructed through a modification of te Ao Māori by absorbing and embodying it in incomplete ways.  
 
The findings of this thesis imply socialism, te Ao Māori and neoliberalism are constantly competing with one another in the analysed policies that construct New Zealand ECE discourses and, as a consequence, influence practice. This plurality has the potential to hinder one discourse from gaining domination over the others. Their joint consumption's and conflicts appear to periodically lessen and strengthen neoliberalism’s power/knowledges across eras, administrations, policies and paragraphs, as exemplified in the updated curriculum. These findings imply that the ‘drivers’ of power are pivotal, hindering and strengthening these discourses which are both complementary and competing. Additionally, the thesis establishes implications regarding the rich complexities of discourses, which can conceal themselves in other discourses, calling for deeper critical reflection if some power/knowledges are to be reduced.

text: Shifting tectonic plates of key discourses in New Zealand early childhood education policy (1989-2017):  A critical discourse analysis at the dawn of change This thesis analysed the presence of neoliberalism, socialism and te Ao Māori in fundamental policy documents that frame New Zealand early childhood practice. It did so to critically engage with, and thus make sense of, neoliberalism’s application and potential growth in New Zealand early childhood policies from 1989 to 2017. The research additionally focused on the interplay of socialist and te Ao Māori discourses in these texts, in conjunction with neoliberalism. It employed a poststructuralist conceptual framework that utilised Kristeva’s intertextuality and Foucault’s discourse, governmentality, and power/knowledge. The philosophical framework facilitated an appreciation of the early childhood education (ECE) sector and government discourses, via policies that exhibited discursive power, truths, and knowledges. This thesis’ approach was employed through a critical discourse analysis, incorporating Kristeva’s intertextuality, Fairclough’s manifest intertextuality and interdiscursivity, as well as a keyword search. This form of document analysis was selected because it enabled me as the researcher to gain a deeper more developed understanding of the policy texts, eliciting meaning and recognition of the discourses often naturalised within them. 
 
Contrary to the dominant claims in ECE literature concerning contemporary discourse, the analysis did not discover the neoliberal discourse’s predominance within the selected policies and documents, as was expected. The neoliberal discourse did exist within government endorsed texts, such as the foreword of Te Whāriki (Ministry of Education, 2017b) and Four Year Plan 2016-2020 (Ministry of Education, 2016). However, when the texts came closest to the sector, such as Te Whāraki (Ministry of Education, 1996; 2017b) and the Licensing Criteria Early Childhood Education and Care (Ministry of Education, 2008), the discourses of socialism, te Ao Māori and neoliberalism, nullified, transformed and modified one another. These findings were exemplified in the updated Te Whāraki (Ministry of Education, 2017b), that limited the neoliberal use of individualism from the original, while also upgrading children’s future potential. ‘Future’ within this text, however, was constructed through a modification of te Ao Māori by absorbing and embodying it in incomplete ways.  
 
This thesis analysed the presence of neoliberalism, socialism and te Ao Māori in fundamental policy documents that frame New Zealand early childhood practice. It did so to critically engage with, and thus make sense of, neoliberalism’s application and potential growth in New Zealand early childhood policies from 1989 to 2017. The research additionally focused on the interplay of socialist and te Ao Māori discourses in these texts, in conjunction with neoliberalism. It employed a poststructuralist conceptual framework that utilised Kristeva’s intertextuality and Foucault’s discourse, governmentality, and power/knowledge. The philosophical framework facilitated an appreciation of the early childhood education (ECE) sector and government discourses, via policies that exhibited discursive power, truths, and knowledges. This thesis’ approach was employed through a critical discourse analysis, incorporating Kristeva’s intertextuality, Fairclough’s manifest intertextuality and interdiscursivity, as well as a keyword search. This form of document analysis was selected because it enabled me as the researcher to gain a deeper more developed understanding of the policy texts, eliciting meaning and recognition of the discourses often naturalised within them. 
 
Contrary to the dominant claims in ECE literature concerning contemporary discourse, the analysis did not discover the neoliberal discourse’s predominance within the selected policies and documents, as was expected. The neoliberal discourse did exist within government endorsed texts, such as the foreword of Te Whāriki (Ministry of Education, 2017b) and Four Year Plan 2016-2020 (Ministry of Education, 2016). However, when the texts came closest to the sector, such as Te Whāraki (Ministry of Education, 1996; 2017b) and the Licensing Criteria Early Childhood Education and Care (Ministry of Education, 2008), the discourses of socialism, te Ao Māori and neoliberalism, nullified, transformed and modified one another. These findings were exemplified in the updated Te Whāraki (Ministry of Education, 2017b), that limited the neoliberal use of individualism from the original, while also upgrading children’s future potential. ‘Future’ within this text, however, was constructed through a modification of te Ao Māori by absorbing and embodying it in incomplete ways.  
 
This thesis analysed the presence of neoliberalism, socialism and te Ao Māori in fundamental policy documents that frame New Zealand early childhood practice. It did so to critically engage with, and thus make sense of, neoliberalism’s application and potential growth in New Zealand early childhood policies from 1989 to 2017. The research additionally focused on the interplay of socialist and te Ao Māori discourses in these texts, in conjunction with neoliberalism. It employed a poststructuralist conceptual framework that utilised Kristeva’s intertextuality and Foucault’s discourse, governmentality, and power/knowledge. The philosophical framework facilitated an appreciation of the early childhood education (ECE) sector and government discourses, via policies that exhibited discursive power, truths, and knowledges. This thesis’ approach was employed through a critical discourse analysis, incorporating Kristeva’s intertextuality, Fairclough’s manifest intertextuality and interdiscursivity, as well as a keyword search. This form of document analysis was selected because it enabled me as the researcher to gain a deeper more developed understanding of the policy texts, eliciting meaning and recognition of the discourses often naturalised within them. 
 
Contrary to the dominant claims in ECE literature concerning contemporary discourse, the analysis did not discover the neoliberal discourse’s predominance within the selected policies and documents, as was expected. The neoliberal discourse did exist within government endorsed texts, such as the foreword of Te Whāriki (Ministry of Education, 2017b) and Four Year Plan 2016-2020 (Ministry of Education, 2016). However, when the texts came closest to the sector, such as Te Whāraki (Ministry of Education, 1996; 2017b) and the Licensing Criteria Early Childhood Education and Care (Ministry of Education, 2008), the discourses of socialism, te Ao Māori and neoliberalism, nullified, transformed and modified one another. These findings were exemplified in the updated Te Whāraki (Ministry of Education, 2017b), that limited the neoliberal use of individualism from the original, while also upgrading children’s future potential. ‘Future’ within this text, however, was constructed through a modification of te Ao Māori by absorbing and embodying it in incomplete ways.  
 
The findings of this thesis imply socialism, te Ao Māori and neoliberalism are constantly competing with one another in the analysed policies that construct New Zealand ECE discourses and, as a consequence, influence practice. This plurality has the potential to hinder one discourse from gaining domination over the others. Their joint consumption's and conflicts appear to periodically lessen and strengthen neoliberalism’s power/knowledges across eras, administrations, policies and paragraphs, as exemplified in the updated curriculum. These findings imply that the ‘drivers’ of power are pivotal, hindering and strengthening these discourses which are both complementary and competing. Additionally, the thesis establishes implications regarding the rich complexities of discourses, which can conceal themselves in other discourses, calling for deeper critical reflection if some power/knowledges are to be reduced.

year: 2018